Features The Toshiba TC is one of the most powerful multimedia capable laptop computer’s available. Utilizing advanced technology and high-speed components, the TC offers excellent display legibility, and IBM PC/AT compatibility. The TC system unit consists of the following features: ❑ Microprocessor The iDX microprocessor operates at 66 MHz. ❑ Math co-processor The microprocessor (iDX2) incorporates a math co-processor. ❑ Cache memory Eight (8) KB of cache memory is stored in the iDX2. Optionally, a turbo cache module ( KB) made by Integrated Device Technology (IDT) can be installed in the TC. When it is installed, the iDX2 cache memory is duplicated. ❑ Disk storage The internal inch Megabyte (MB) Hard Disk Drive (HDD) has an average access time of 10 milliseconds. A inch Floppy Disk Drive (FDD) supports 2HD floppy disks ( Mbytes) and 2DD floppy disks ( Kbytes). The TC also has a built-in inch bay for an optional CD-ROM. ❑ Memory The TC comes standard with 8 MB of CMOS Random Access Memory (RAM). This includes KB of conventional memory and 7, KB of extended memory, which can be utilized as a BIOS ROM data copy area, and as expanded memory that is compatible with the Lotus/Intel/Microsoft Expanded Memory Specifications (LIMEMS). ❑ Display The high-resolution, Thin Film Transistor (TFT) color Liquid Crystal Display (LCD) displays x pixels with K colors for both graphics and characters. The internal display controller supports Video Graphics Adapter (VGA) functions on the internal display device and Super VGA (SVGA) functions on an external CRT. The internal LCD and an external CRT can display simultaneously. The Toshiba proprietary x mode and AT&T proprietary x mode are supported at the BIOS level. TC, TC/CD, TC/CDV ❑ Keyboard The easy-to-use /key enhanced detachable keyboard with full-size keys and standard spacing is compatible with IBM standard software. ❑ Power supply The power supply is a universal, auto-sensing power supply which enables worldwide usage of the TC as long as a compatible AC plug is available. ❑ Expansion slots The two Industry Standard Architecture (ISA) bus slots allow for an IBM-compatible full-size card and half-size cards. ❑ Memory card slots Two optional memory card slots (pin) enable you to install the following Toshiba optional memory cards: 4 MB memory card: 8 MB memory card: 16 MB memory card: PAU PAU PAU ❑ Personal Computer Memory Card International Association (PCMCIA) card slot The optional built-in PCMCIA slot measures 16 mm high. ❑ Parallel port The Centronics-compatible parallel interface port serves two purposes: the port can be used to connect a Centronics-compatible printer or an external inch floppy disk drive. ❑ RSC port The RSC port is a 9-pin serial interface port. ❑ Mouse port The 6-pin mouse port on the back supports an IBM PS/2 mouse. ❑ Keyboard port The 6-pin keyboard port on the back supports an IBM PS/2-compatible keyboard. TC, TC/CD, TC/CDV ❑ RGB port The pin RGB analog port on the back supports an external CRT. ❑ SCSI port The TC has a Small Computer System Interface (SCSI) port. ❑ Audio ports The computer has the following standard mm diameter miniature stereo jacks for an audio system: • • • • Headphone (with speaker shut-off switch) Line out Line in Microphone ❑ Special ports The TC has a Feature connector and Z-connector for use with expansion cards. TC, TC/CD, TC/CDV The TC Personal Computer is shown in Figure , and its system configuration is illustrated in Figure Figure TC Personal Computer Figure TC System Unit Configuration TC, TC/CD, TC/CDV System Unit Block Diagram Figure shows a block diagram of the TC system unit. Figure TC System Board Block Diagram TC, TC/CD, TC/CDV The block diagram shown in Figure is composed of the following major components: ❑ An iDX CPU which incorporates a math co-processor and 8 KB cache memory. ❑ The following memory components: Standard RAM: Cache memory: System, Video BIOS: SCSI BIOS: Video RAM: Memory card: 8 MB, bit data width (70 ns) 8 KB (inside CPU), a turbo cache memory module can be installed, duplicating the CPU’s cache memory. KB (96 KB are used), 8-bit data width 1 Mbit flash ROM. ( ns) This ROM contains Initial Reliability Test (IRT), Basic Input/ Output System (BIOS), and video BIOS. 32 KB (16 KB are used), 8-bit data width EROM is used. ( ns) 1 MB, bit data width (Eight Kx4 bit chips) 4, 8, or 16 MB memory card can be installed. bit data width. ❑ Super Integration (SI) T, which stores the following components: • • • • • • • • • Two Direct Memory Access Controllers (DMAC): . 82C37 equivalent Two Programmable Interrupt Controllers (PIC): 82C59 equivalent One Programmable Interval Timer (PIT): 82C54 equivalent One Floppy Disk Controller (FDC): TC equivalent One Serial Input/Output Controller (SIO): TC equivalent (The TC does not use SIO inside the T) One Variable Frequency Oscillator (VFO) TC equivalent One I/O Controller One Printer Port Controller One Speaker Controller ❑ Serial Input/Output Controller (SIO) One NS chip controls the internal serial port. ❑ Real Time Clock (RTC) One T chip is used (which has bytes of memory). Fourteen bytes of memory are used for the calendar and clock, and the remaining bytes are used for system configuration data. TC, TC/CD, TC/CDV ❑ Keyboard Controller (KBC) An ME1FP chip and an chip are used. The ME1FP is a keyboard interface controller which controls the internal keyboard, external keyboard port, and PS/2 mouse port. The chip is a keyboard scan controller which is mounted inside the detachable keyboard unit. ❑ VGA Display Controller: WD90C31 This controller controls both internal and external VGA-compatible displays and external SVGA-compatible displays with an Analog Digital Converter (DAC). The controller can display data on the internal and external display simultaneously. ❑ SCSI Controller An AIC chip controls the internal Small Computer System Interface (SCSI) port. ❑ Sound Controller An AD chip controls the internal sound system. ❑ The Clock Generator receives MHz (X1) and generates the following frequencies: • • • • • 66 MHz for the CPU MHz for the COM 24 MHz for the FDC and VFO 16 MHz is used for KBC (8 MHz) MHz for VGA display controller OSC (X3) generates KHz for RTC OSC (X) generates MHz for sound system OSC (X) generates TC, TC/CD, TC/CDV inch Floppy Disk Drive The TC inch Floppy Disk Drive (FDD) is a thin, high-performance reliable drive that supports KB (formatted) 2DD and MB (formatted) 2HD inch floppy disks. The TC FDD is shown in Figure , and its specifications are described in Table Figure inch FDD Table inch FDD Specifications Item 2 MB Mode 1 MB Mode 2, 1, 1, 2 2 80 80 Access time (ms) Track to track Average Head settling time 3 15 3 15 Recording track density (tpi) Data transfer rate (Kbps) Rotation speed (rpm) Storage capacity (KB) Unformatted Formatted Number of heads Number of cylinders Recording method TC, TC/CD, TC/CDV Modified Frequency Modulation (MFM) inch Hard Disk Drive The Hard Disk Drive (HDD) is a random access, non-volatile storage device. It has a nonremovable inch magnetic disk and mini-Winchester type magnetic heads. The TC supports a MB HDD. The disk drive is shown in Figure , and its specifications are described in Table Figure inch HDD Table inch HDD Specifications Item Specification Model Name CP Storage capacity (MB) Formatted Number of disks 3 Data heads 6 Data surfaces 6 Tracks per surface Sectors per track 59 (60) to 89 (90) Bytes per sector to Access time (ms) Track to track Average Maximum 2 10 18 Rotation speed (rpm) 5, Data transfer rate (bps) To/from media M Interleave Recording method RLL TC, TC/CD, TC/CDV Keyboard The key (USA) or key (European) keyboard is mounted on the TC’s system unit, and is connected to the keyboard controller on the system board through a pin flat cable. The keyboard is shown in Figure See Appendix F for optional keyboard configurations. Figure Keyboard TC, TC/CD, TC/CDV Display The TC display is a TFT Color Liquid Crystal Display (LCD) which contains an LCD module, a Fluorescent Lamp (FL), and an FL inverter board. TFT Color LCD Module The TC TFT color LCD is backlit and supports x pixels with a High Resolution Graphics Subsystem (HRGS) and K colors for graphics and characters. The HRGS includes the functions of the Video Graphics Array (VGA). The LCD receives vertical and horizontal synchronizing signals, 9-bit data signals, data enable signals, and shift clock for data transmission. All signals are CMOS-level compatible. The TFT LCD and FL inverter board are shown in Figure , and specifications for the LCD are described in Table Figure TFT Color LCD and FL Inverter Board Table TFT Color LCD Specifications Item Specifications Number of Dots (dots) x Dot pitch (mm) (W) x (H) Display area (mm) (W) x (H) Contrast FL current FL frequency (minimum) (mA) (KHz) 20 to 60 TC, TC/CD, TC/CDV Fluorescent Lamp (FL) Inverter Board The FL inverter board supplies high frequency current to the LCD’s Fluorescent Lamp. Specifications for the FL inverter are described in Table Table FL Inverter Board Specifications Item Input Output Specifications Voltage (VDC) 24 Power (W) Voltage (VAC) 1, r.m.s Current (mA) 7 mA r.m.s Frequency (KHz) Current limits (mA) TC, TC/CD, TC/CDV 36 to Power Supply The universal auto-sensing power supply can be used worldwide. It supplies +5, –5, +12, +24 and –12 VDC to the system. The power supply unit is housed in the system unit and supplies regulated power to the: 1) 2) 3) 4) 5) 6) 7) 8) 9) System board Back panel board inch floppy disk drive (FDD) inch hard disk drive (HDD) External keyboard port Liquid crystal display (LCD) Option slots DC fans PS/2 mouse port The power supply unit includes an input line filter, line fuse, cooling fan, power conversion circuitry and connectors. Input ratings are: VAC, A or VAC, A. The power supply unit is shown in Figure , and the output ratings are specified in Table Figure Power Supply Unit Table Power Supply Unit Output Rating for the System * For system DC Voltage (V) +5 +12 Maximum Current (A) –5 –12 +24 * For identification of output voltage ratings, refer to Section C in Appendix C. TC, TC/CD, TC/CDV Troubleshooting Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the TC is causing the computer to malfunction. The FRUs covered are: 1. 2. 3. 4. 5. 6. 7. Power Supply System Board Back Panel Board Floppy Disk Drive Hard Disk Drive Keyboard Display The Diagnostics Disk operations are described in Chapter 3 and detailed replacement procedures are given in Chapter 4. The following tools are necessary for implementing the troubleshooting procedures: 1. 2. 3. 4. 5. 6. 7. 8. 9. A TC Diagnostics Disk Two Phillips screwdrivers (3 mm and 2 mm) A Toshiba MS-DOS system disk(s) A 2DD or 2HD formatted work disk for floppy disk drive testing A cleaning kit for floppy disk drive troubleshooting A printer port LED An RSC wraparound connector A printer wraparound connector A multimeter An external inch floppy disk drive An external CRT MS-Windows V system disk MS-Windows Sound system disk Headphone External speaker L, R (including the amplifier) Microphone Sound source (tape recorder, etc.) Audio cable with standard mm diameter stereo connector Internal HDD (CP for TC) Internal HDD (MKFB) External SCSI HDD TC, TC/CD, TC/CDV Troubleshooting Flowchart Use the flowchart in Figure as a guide for determining which troubleshooting procedures to execute. Before going through the flowchart steps, verify the following: ❑ Ask the user if a password is registered, and if it is, ask him or her to enter the password. If the user has forgotten the password, refer to Appendix H for procedures on how to delete it. ❑ Verify with the customer that Toshiba MS-DOS is installed on the hard disk. NonToshiba operating systems can cause the computer to malfunction. ❑ Make sure all optional equipment is disconnected from the computer. After removing all optional devices, if the TC is found to be operating properly, then an optional device or a TC interface is causing the problem. Check the following items: For a memory card, PCMCIA card, turbo cache module, and connected I/O port devices, check the TC with the optional device or with a wraparound board for the I/O port using the test program. If the TC works with no errors, the optional device is malfunctioning. If the TC does not work or there is an error, the system board is malfunctioning. For expansion slot cards, check the TC with a wraparound board for an expansion slot. If the TC works with no errors, the expansion card is malfunctioning. If the TC does not work or there is an error, the back panel board or system board is malfunctioning. ❑ Make sure the floppy disk drive is empty. TC, TC/CD, TC/CDV Figure Troubleshooting Flowchart (1/2) TC, TC/CD, TC/CDV Figure Troubleshooting Flowchart (2/2) If the diagnostics program cannot detect an error, the problem may be intermittent. The Running Test program should be executed several times to isolate the problem. Check the Log Utilities function to confirm which diagnostic test detected an error(s), then perform the appropriate troubleshooting procedures as follows: 1. If an error is detected on the System Test, Memory Test, Display Test, ASYNC Test, Printer Test, or Real Timer Test, perform the System Board Troubleshooting Procedures in Section 2. If an error is detected on the Keyboard Test, perform the Keyboard Troubleshooting Procedures in Section 3. If an error is detected on the Floppy Disk Test, perform the Floppy Disk Drive Troubleshooting Procedures in Section 4. If an error is detected on the Hard Disk Test, perform the Hard Disk Drive Troubleshooting Procedures in Section TC, TC/CD, TC/CDV Power Supply Troubleshooting The TC’s power supply supplies the power to the components in the TC. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other procedures as instructed. Procedures described in this section are: Procedure 1: Power Cord Check Procedure 2: Connector Check Procedure 3: Output Voltage Check Procedure 1 Power Cord Check The TC’s power cord carries AC voltage to the power supply unit from a wall outlet. Check 1 Turn off the power, make sure the power cord is firmly plugged into the AC IN socket and into a working wall outlet. If the power cord is connected correctly, go to Check 2. Check 2 Disconnect the power cord from the TC. Use a multimeter to check the output voltage from the wall outlet on the power cord. If the output voltage is not correct, replace the power cord with a new one. If output voltage is correct, perform Procedure 2. Procedure 2 Connector Check The power supply cables should be connected to the system board. These cables may be disconnected or damaged. Open the keyboard cable cover following the steps described in Chapter 4 to check the power supply cable connection to the system board. Check 1 Remove the keyboard cable cover. Make sure the power supply cables are connected to the system board. PJ Power supply unit System board PJ If these cables are disconnected, connect them to the system board. If these cables are damaged, replace the power supply unit. If these cables are OK, perform Procedure 3. TC, TC/CD, TC/CDV Procedure 3 Output Voltage Checklist The power supply supplies five voltages to the system board. Check the output voltage of the power supply unit. Check 1 Remove the keyboard cable cover, connect the power supply cables to the system board, then connect the AC cord and turn on the power. Use a multimeter to check the following voltages: Table Output Voltages Connector PJ PJ Pin No. Voltage (V) 1 2 3 4 5 6 7 8 9 10 11 GND -5 GND GND GND GND GND GND GND GND 1 2 3 4 5 6 7 8 9 10 +5 +5 +5 +5 +5 +5 +24 +12 +12 +12 (±10%) (±10%) (±5%) (±5%) (±5%) (±5%) (±5%) (±5%) (+8V/-4V) (±5%) (±5%) (±5%) If the output voltages are not correct, replace the power supply unit. If the output voltages are correct, the system board may be damaged. Go to Section , System Board Troubleshooting. TC, TC/CD, TC/CDV System Board Troubleshooting This section describes how to determine if the system board is defective or not functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are: Procedure 1: Message Check Procedure 2: Printer Port LED Check Procedure 3: Diagnostic Test Program Execution Check Procedure 4: SCSI Logic Check Procedure 5: Sound Logic Check Procedure 6: System Board Replacement Check TC, TC/CD, TC/CDV Procedure 1 Message Check When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in the BIOS ROM. The IRT tests each IC on the system board and initializes it. ❑ If an error message is shown on the display, perform Check 1. ❑ If there is no error message, go to Procedure 2. ❑ If Toshiba MS-DOS is properly loaded, go to Procedure 3. Check 1 If one of the following error messages is displayed on the screen, press the F1 key as the message instructs. (a) (b) (c) (d) (e) *** Error in CMOS. Check system. Then *** Error in CMOS. Check system. Then *** Error in CMOS. Check system. Then *** Error in CMOS. Check system. Then *** Error in CMOS. Check system. Then Bad configuration type *** press [F1] key Bad battery *** press [F1] key Bad check sum *** press [F1] key Bad memory size *** press [F1] key Bad time function *** press [F1] key These errors occur when the system configuration preserved in the RTC memory (CMOS-type memory) is not the same as the actual configuration or when data is lost. If you press the F1 key as the message instructs, the system configuration in the RTC memory configuration is set to the default setting. If Error Message (b) appears often when the power is turned on, replace the RTC battery. If any other error message is displayed, perform Check 2. Check 2 The IRT checks the system board, and when it detects an error, the system stops or an error message appears. Refer to Table for a list of error messages. ❑ If one of the following error messages displays, replace the system board: Error Messages 1 through 23, 26, 30, or 31 ❑ If Error Message 24 or 25 displays, go to the Keyboard Troubleshooting Procedures in Section ❑ If Error Message 27 or 28 is displayed, go to the HDD Troubleshooting Procedures in Section ❑ If Error Message 29 is displayed, go to the FDD Troubleshooting Procedures in Section TC, TC/CD, TC/CDV Table IRT Error Messages No. Error Message 1 CPU ERROR 2 SYSTEM BIOS CHECK SUM ERROR 3 TIMER CH.2 OUT ERROR 4 PIT ERROR 5 MEMORY REFRESH ERROR 6 FIRST 64KB MEMORY ERROR 7 FIRST 64KB MEMORY PARITY ERROR 8 RTC ERROR 9 RTC UPDATE ERROR 10 CRTC ERROR 11 VRAM ERROR 12 KBC ERROR 13 SYSTEM MEMORY ERROR 14 SYSTEM MEMORY PARITY ERROR 15 EXTENDED MEMORY ERROR 16 EXTENDED MEMORY PARITY ERROR 17 PROTECTED MODE ERROR 18 CPU EXCEPTION ERROR 19 DMA PAGE REGISTER ERROR 20 DMAC #1 ERROR 21 DMAC #2 ERROR 22 PIC #1 ERROR 23 PIC #2 ERROR 24 KEYBOARD ERROR 25 KBC ERROR 26 HDC ERROR 27 HDD #0 ERROR 28 HDD #1 ERROR 29 NO FDD ERROR 30 FDC ERROR 31 TIMER INTERRUPT ERROR TC, TC/CD, TC/CDV Procedure 2 Printer Port LED Check The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value. Figure shows the printer port LED. NOTE: When you perform this check, the external FDD/PRT option in the SETUP program must be set to PRT. Figure Printer Port LED To use the printer port LED, follow these steps: 1. Turn off the TC’s power. 2. Plug the printer port LED into the computer’s PRT/FDD connector. 3. Hold down the space bar and turn on the TC’s power. 4. Read the LED status from left to right as you face the back of the computer. 5. Convert the status from binary to hexadecimal notation. 6. If the final LED status is FFh (normal status), go to Procedure 3. 7. If the final LED status matches any of the test status values in Table , perform Check 1. NOTE: If an error condition is detected by the IRT test, the printer port LED displays an error code. For example, if the printer port LED displays 02H and halts, it indicates a PIT test error. TC, TC/CD, TC/CDV Table Printer Port LED Boot Mode Error Statuses (1/2) Error Status 01H 02H Test Item Message CPU test CPU ERROR System ROM check sum test SYSTEM ROM CHECK SUM ERROR PIT test TIMER CH.****Error in CMOS. ****Error in CMOS. ****Error in CMOS. Check system. Then Bad battery**** Bad check sum**** Bad configuration**** Bad time function**** press [F1] key TC, TC/CD, TC/CDV Check 1 If any of the following error codes are displayed, replace the system board with a new one. 00h, 02h, 05h, 06h, 07h, 0Ah, 0Ch, 0Dh, 15h, 16h, 18h, 1Fh, 22h, 25h, 30h, 31h, 33h, 40h, 41h, 42h, 54h, 55h, 5Bh, 60h, 65h, 70h, 80h, 90h, A0h, A6h, FEh Check 2 If Error Code 4Ah is displayed, go to the Keyboard Troubleshooting procedures in Section Check 3 If Error Code 5Dh is displayed, go to the HDD Troubleshooting procedures in Section Check 4 If Error Code 60h is displayed, go to the FDD Troubleshooting procedures in Section Procedure 3 Diagnostic Test Program Execution Check Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, Tests and Diagnostics, for more information on how to perform these tests. 1. 2. 3. 4. System Test Memory Test Printer Test ASYNC Test If an error is detected during these tests, replace the system board with a new one. TC, TC/CD, TC/CDV Procedure 4 SCSI Logic Check Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, Tests and Diagnostics, for more information on how to perform these tests. Check 1 External SCSI interface check Step 1 Make sure the internal SCSI connector is not connected to PJ9 on the back panel board. Step 2 Connect the SCSI terminator resister module to the RM and RM sockets on the back panel board. Step 3 Make sure the RM 1 and RM 2 sockets are not connected to the system board. Step 4 Connect the external SCSI HDD to the external SCSI port (PJ). Step 5 Execute the HDD test of the diagnostic test program. Select 2: HDD2 for the Test drive number. If an error is detected during the HDD tests, replace the system board with a new one. Check 2 Internal SCSI interface check Step 1 Make sure the external SCSI port is not connected to PJ on the system board. Step 2 Connect the internal SCSI HDD to PJ9 on the back panel board and SCSI HDD power cable to PJ6 or PJ7. Step 3 Make sure RM and RM are not connected. Step 4 Connect the SCSI terminator resister module to RM 1 and RM 2 on the system board. Step 5 Execute the HDD test in the diagnostic test program. Select 2:HDD2 for the Test drive number. If an error is detected during the HDD tests, replace the system board with a new one. TC, TC/CD, TC/CDV Procedure 5 Sound Logic Check Follow these procedures to execute the sound controller test with a sound source, such as a tape recorder. You will need to connect a mouse to execute this test. Preparation of a Spare HDD Step 1 Install Toshiba MS-DOS, Windows , Windows Sound System, and the Logitech Trackman Portable Driver. Step 2 Open the Windows file "standardservices.com.pk" in a text editor. Step 3 Edit the following lines under [windows] in the standardservices.com.pk file in the order indicated below: load=C:\SNDSYS\standardservices.com.pk (about line five of the file) run=C:\SNDSYS\SOUNDS\POPJAZRMI (about line 90 of the file) Step 4 Insert the following lines under [sounds] in the standardservices.com.pk file in the order indicated below: SystemStart=C:\SNDSYS\SOUNDS\standardservices.com.pk,Windows Start Step 5 Edit the standardservices.com.pk file as follows: rem c:\DOS\DOSSHELL (change) WIN (add as the last line) Preparation for the Test Step 1 Remove any SCSI devices that may be connected. (Be sure to reinstall them after completing the test.) Step 2 Install the HDD prepared for conducting the sound system test. (After the test, reinstall the original HDD.) Step 3 Connect a Logitech Trackman Portable to the connector panel. Step 4 Connect the following to the connector panel: mike to PJ, speaker with amplifier to PJ, and sound source to PJ TC, TC/CD, TC/CDV Test Execution Remove any floppy disk from the FDD and turn on the power. Follow the steps below to execute the sound controller test: Step 1 Confirm that Wagner’s Wedding March is played when power is turned on. Step 2 Confirm that pops and jazz are played. Step 3 While the music is playing, plug a headphone into jack PJ and confirm that sound from the speakers is turned off. Step 4 Before pops and jazz stop automatically, press Alt + S to halt sound execution. Step 5 Put on the headphones. Step 6 Use the mouse to double click the Quick Recorder icon at the bottom left of the screen to display the Quick Recorder window. Step 7 Click the red circle in the window and say “test, test” into the mike to record your voice. Step 8 Click the black square to stop recording. Step 9 Click the black triangle to check that your voice is played back. Step 10 Click the black square and select Options. Step 11 Select Set Recording Level. Step 12 Select Line-in. Step 13 Turn on the sound source. Step 14 Click the Red circle to record the sound source. Step 15 Click the black square to stop recording. Step 16 Click the black triangle to check that the sound source is played back. Step 17 Click the black square. Step 18 Select Options. Step 19 Select Set Recording Level. Step 20 Select microphone. TC, TC/CD, TC/CDV Step 21 Test is completed. Turn off the power. Restore the customer’s computer to its original state: remove all connectors, boards or memory cards you used for the test and reinstall the original HDD and other devices removed for the test. If your voice or the sound source is not played back in Steps 9 and 16, replace the system board with a new one. Procedure 6 System Board Replacement Check The system board may be damaged. Disassemble the TC following the steps described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Replace the system board with a new one. Refer to Chapter 4 for instructions on how to remove and replace the unit. If the problem still exists, perform Check 2. Check 2 Replace the back panel board with a new one. If the problem still exists, perform Check 3. Check 3 If normal operation is not restored, another FRU is probably defective. The defective unit must be isolated by performing the TC Diagnostics Program. TC, TC/CD, TC/CDV Floppy Disk Drive Troubleshooting This section describes how to determine if the TC’s internal inch floppy disk drive is functioning properly. Perform the steps below starting with Procedure 1 and continue with the other procedures as required. Procedure 1: FDD Head Cleaning Check Procedure 2: External inch FDD Check Procedure 3: Diagnostic Test Program Check Procedure 4: Connector Check and Replacement Check Procedure 1 FDD Head Cleaning Check FDD head cleaning is one option available in the Diagnostic Program. A detailed description of the head-cleaning operation is given in Chapter 3, Tests and Diagnostics. After loading Toshiba MS-DOS, run the Diagnostic Program and then clean the FDD heads using the cleaning kit. If the FDD still does not function properly after cleaning, go to Procedure 3. If the test program cannot be executed on the TC, go to Procedure 2. Procedure 2 External inch FDD Check The floppy disk controller on the computer’s system board controls the internal and external FDD. To determine if either the system board or the internal FDD is defective, check the following items: Check 1 Connect the external inch FDD to the PRT/FDD port and make sure it functions properly. If it does, perform Procedure 4. If it doesn’t, perform Check 2. NOTE: To use the external inch FDD, set the external FDD/PRT option in the SETUP program to FDD A or FDD B. Check 2 Replace the system board with a new one following the steps in Chapter 4, Replacement Procedures. TC, TC/CD, TC/CDV Procedure 3 Diagnostic Test Program Execution Check The Floppy Disk Drive Diagnostic Test program is stored on the TC Diagnostics Disk. After loading Toshiba MS-DOS, run the diagnostic program. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostics test procedures. Floppy disk drive test error codes and their status names are described in Table Make sure the floppy disk in the FDD is formatted correctly and that the write protect tab is disabled. If any other errors occur while executing the FDD diagnostics test, go to Procedure 4. Table Floppy Disk Drive Error Codes and Statuses Code Status 01h Bad command 02h Address mark not found 03h Write protected 04h Record not found 06h Media removed on dual attach card 08h DMA overrun error 09h DMA boundary error 10h CRC error 20h FDC error 40h Seek error 60h FDD not drive 80h Time-out error (Not ready) EEh Write buffer error FFh Data compare error TC, TC/CD, TC/CDV Procedure 4 Connector Check and Replacement Check The inch Floppy Disk Drive is connected to the system board by the FDD cable. This cable may be disconnected from the system board or damaged. Disassemble the TC following the steps described in Chapter 4, Replacement Procedures and perform the following checks: Check 1 Remove the keyboard cable cover. Make sure the FDD cable is firmly connected to the system board. FDD PJ System board If this cable is disconnected, connect it to the system board and repeat Procedure 3. If the FDD is still not functioning properly, perform Check 2. Check 2 The FDD or its cable may be defective or damaged. Replace the FDD with a new one following the steps in Chapter 4, Replacement Procedures. If the FDD is still not functioning properly, perform Check 3. Check 3 Replace the system board with a new one following the steps in Chapter 4, Replacement Procedures. TC, TC/CD, TC/CDV Hard Disk Drive Troubleshooting To determine if the hard disk drive is functioning properly, perform the procedures below starting with Procedure 1. Continue with the other procedures as instructed. Procedure 1: Partition Check Procedure 2: Message Check Procedure 3: Format Check Procedure 4: Diagnostic Test Program Execution Check CAUTION: The contents of the hard disk will be erased when the HDD troubleshooting procedures are executed. Transfer the contents of the hard disk to a floppy disk(s) using the Toshiba MS-DOS BACKUP command. Refer to the Toshiba MS-DOS Manual for more information about how to perform the BACKUP command. Procedure 1 Partition Check Insert the Toshiba MS-DOS system disk and turn on the computer, then perform the following checks: Check 1 Type C: and press Enter. If you cannot change to Drive C, go to Check 2. If you can change to Drive C, go to Procedure 2. Check 2 Type FDISK and press Enter. Choose "Display Partition Information" from the FDISK menu. If Drive C is listed, go to Check 3. If Drive C is not listed, return to the FDISK menu and choose the option to create a DOS partition on Drive C, then recheck the system. If the problem still exists, go to Procedure 2. Check 3 If Drive C is listed as active in the FDISK menu, go to Check 4. If Drive C is not listed as active, return to the FDISK menu and choose the option to set the active partition for Drive C, then recheck the system. If the problem still exists, go to Procedure 2. Check 4 Remove the system disk from the FDD and cold boot the computer. If the problem still exists, go to Procedure 2. Otherwise, the HDD is operating normally. TC, TC/CD, TC/CDV Procedure 2 Message Check When the TC’s HDD does not function properly, some of the following error messages may appear on the display. Start with Check 1 below and perform the other checks as instructed. Check 1 If any of the following messages appear, perform Check 2. If the following messages do not appear, perform Check 4. Note that the error messages appear on the display for five (5) seconds, then disappear. HDC ERROR or HDD #0 ERROR or HDD #1 ERROR Check 2 If either of the following messages appears, perform Procedure 3. If the following messages do not appear, perform Check 3. Insert system disk in drive Press any key when ready or Non-System disk or disk error Replace and press any key Check 3 Using the Toshiba MS-DOS system disk, install a system program on the hard disk using the SYS command. If the following message appears on the display, the system program has been transferred to the HDD. Restart the TC. If the error message still appears, perform Check 4. System transferred Check 4 The HDD is connected to the system board through the back panel board using an HDD signal cable and an HDD power cable. These cables can become disconnected or damaged. Disassemble the TC as described in Chapter 4, Replacement Procedures. If the HDD is not connected, connect it to the system board and return to Procedure 1. If the HDD is firmly connected to the system board, perform Procedure 3. PJ5 System board HDD PJ6 TC, TC/CD, TC/CDV Procedure 3 Format Check The TC’s HDD is formatted using the low level format program and the MS-DOS FORMAT program. To format the HDD, start with Check 1 below and perform the other steps as required. Check 1 Using the Toshiba MS-DOS system disk, partition the hard disk using the FDISK command. Format the hard disk using FORMAT C:/S/U to transfer the system program to the HDD. If the following message appears on the display, the HDD is formatted. Format complete If any other error message appears on the display, refer to the Toshiba MS-DOS Manual for more information and perform Check 2. Check 2 Using the TC Diagnostics disk, format the HDD with a low level format option. Refer to Chapter 3, Tests and Diagnostics for more information about the diagnostics program. If the following message appears on the display, the HDD low level format is complete. Partition and format the HDD using the MS-DOS FORMAT command. Format complete If you cannot format the HDD using the Tests and Diagnostics program, go to Procedure 4. TC, TC/CD, TC/CDV Procedure 4 Diagnostic Test Program Execution Check The HDD test program is stored in the TC Diagnostics Disk. Perform all of the HDD tests in the Hard Disk Drive Test option. Refer to Chapter 3 for more information about the HDD test program. If an error is detected during the HDD test, an error code and status will be displayed; perform Check 1. The error codes and statuses are described in Table If an error code is not generated, the HDD is operating properly. Table Hard Disk Drive Error Codes and Statuses Code Status 01h Bad command 02h Bad address mark 04h Record not found 05h HDC not reset 07h Drive not initialized 08h HDC overrun (DRQ) 09h DMA boundary error 0Ah Bad sector error 0Bh Bad track error 10h ECC error 11h ECC recover enable 20h HDC error 40h Seek error 80h Time-out error AAh Drive not ready BBh Undefined error CCh Write fault E0h Status error EEh Access time-out error FFh Data compare error Check 1 Replace the HDD unit with a new one following the instructions in Chapter 4, Replacement Procedures. If the HDD is still not functioning properly, perform Check 2. Check 2 Replace the back panel board with a new one following the instructions in Chapter 4. If the HDD is still not functioning properly, perform Check 3. Check 3 Replace the system board with a new one following the instructions in Chapter 4. TC, TC/CD, TC/CDV Keyboard Troubleshooting To determine if the TC’s keyboard is functioning properly, perform the following procedures. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Diagnostic Test Program Execution Check Procedure 2: Connector and Replacement Check Procedure 1 Diagnostic Test Program Execution Check Execute the Keyboard Test in the Diagnostics Program. Refer to Chapter 3, Tests and Diagnostics, for more information on how to perform the test program. If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning properly. Procedure 2 Connector and Replacement Check The keyboard is connected to the system board cable. This cable may be disconnected or damaged. Disassemble the TC as described in Chapter 4, Replacement Procedures, and perform the following checks. Check 1 Remove the keyboard cable cover. Make sure the keyboard cable is not damaged and is connected to the system board. Keyboard unit PJ System board If this cable is damaged, replace the keyboard unit with a new one. If the cable is disconnected, firmly connect it. Perform Procedure 1 again. If the keyboard is still not functioning properly, perform Check 2. Check 2 The keyboard controller on the system board may be damaged. Replace the system board with a new one. Refer to Chapter 4 for more information about how to replace the system board. TC, TC/CD, TC/CDV Display Troubleshooting This section describes how to determine if the TC’s display is functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Contrast Control Check Procedure 2: External CRT Check Procedure 3: Diagnostic Test Program Execution Check Procedure 4: Connector Check Procedure 5: Replacement Check Procedure 1 Contrast Control Check The TC display contrast is controlled by the contrast dial, which is located on the right side of the display. Make sure the contrast dial is adjusted correctly. If the contrast does not change when you turn the contrast dial, perform Procedure 2. Procedure 2 External CRT Check Connect the external CRT to the TC’s external monitor port, then boot the computer. The computer automatically detects the external CRT. If the external CRT works correctly, the internal LCD display may be damaged. Go to Procedure 3. If the external CRT appears to have the same problem as the internal LCD, the display controller or connection between the display and system board may be damaged. Go to Procedure 4. Procedure 3 Diagnostic Test Program Execution Check The Display Test program is stored on the TC Diagnostics Disk. This program checks the display controller on the system board. After loading Toshiba MS-DOS, run the Diagnostics Program. Refer to Chapter 3, Tests and Diagnostics, for details. If an error is detected, go to Procedure 4. If an error is not detected, the display is functioning properly. TC, TC/CD, TC/CDV Procedure 4 Connector Check The Display unit has an LCD module, FL unit, Display switch, and FL inverter board. The FL unit and FL inverter board are connected by two cables. The LCD module and system board are connected by a signal cable. The system board and FL inverter board are also connected by a signal cable as shown below. Any of these cables may be disconnected. Disassemble the display unit and check the following cable connections. Refer to Chapter 4, Replacement Procedures, for more information about how to disassemble the computer. CN 1 FL inverter board CN 2 CN 3 System board PJ CN 3 CN 2 CN 1 LCD module Figure TC Display Connection If any of these cables are not connected, firmly reconnect them and repeat Procedures 1 and 2. If the problem still exists, perform Procedure 5. TC, TC/CD, TC/CDV Procedure 5 Replacement Check The FL unit, FL inverter board, LCD module, and system board have display circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement Procedures, for instructions on how to disassemble the computer and then perform the following checks: ❑ If the FL unit does not light, perform Check 1. ❑ If characters are not displayed clearly, perform Check 3. ❑ If some screen functions do not operate properly, perform Check 3. ❑ If the FL remains lit when the display is closed, perform Check 4. Check 1 Replace the FL unit with a new one and test the display again. If the problem still exists, perform Check 2. Check 2 Replace the FL inverter board with a new one and test the display again. If the problem still exists, perform Check 3. Check 3 Replace the LCD module with a new one and test the display again. If the problem still exists, perform Check 4. Check 4 Replace the display switch with a new one and test the display again. If the problem still exists, perform Check 5. Check 5 Replace the display cable with a new one and test the display again. If the problem still exists, perform Check 6. Check 6 The system board may be damaged. Replace the system board with a new one and test the display again. TC, TC/CD, TC/CDV The Diagnostic Test This chapter explains how to use the TC’s Diagnostic Test program (TESTCE66) to test the functions of the TC’s hardware modules. The Diagnostics Program is stored on the TC Diagnostic Disk and consists of 19 programs that are grouped into the Service Program Module (DIAGNOSTICS MENU) and the Test Program Module (DIAGNOSTICS TEST MENU). The DIAGNOSTICS MENU consists of the following functions. ❑ DIAGNOSTIC TEST ❑ HARD DISK FORMAT ❑ HEAD CLEANING ❑ LOG UTILITIES ❑ RUNNING TEST ❑ FDD UTILITIES ❑ SYSTEM CONFIGURATION ❑ SETUP The DIAGNOSTIC TEST option contains the following functional tests: ❑ SYSTEM TEST ❑ MEMORY TEST ❑ KEYBOARD TEST ❑ DISPLAY TEST ❑ FLOPPY DISK TEST ❑ PRINTER TEST ❑ ASYNC TEST ❑ HARD DISK TEST ❑ REAL TIMER TEST ❑ NDP TEST ❑ EXPANSION TEST TC, TC/CD, TC/CDV The following equipment is required to perform some of the TC Diagnostic Test programs. ❑ The TC Diagnostics Disk (all tests) ❑ A formatted working disk for the floppy disk drive test (all tests) ❑ inch 2HD/2DD disk for the internal inch FDD ❑ inch 2D disk for an external inch FDD ❑ A cleaning kit to clean the floppy disk drive heads (Head Cleaning) ❑ A printer wraparound connector (34MG01) for the printer wraparound test (Printer test) ❑ An RSC wraparound connector (34MG01) for the RSC port wraparound test (ASYNC test) ❑ An external SVGA display for the SVGA display test ❑ An optional memory card for the memory module test ❑ A PCMCIA wraparound card for the PCMCIA wraparound test ❑ A wraparound board for a bit bus (34PG01) for the 32 bus wraparound test ❑ An RSC direct cable for the point-to-point test (ASYNC test) ❑ An F, Z special connector for the F, Z connector check test ❑ A turbo cache memory module for the turbo cache memory test The sections that follow detail the tests within the Diagnostic Test function of the DIAGNOSTIC MENU. Refer to Sections through for detailed information on the remaining Service Program Module functions. TC, TC/CD, TC/CDV Executing the Diagnostic Test Toshiba MS-DOS is required to run the TC DIAGNOSTICS PROGRAM. NOTE: You cannot run the diagnostics program on a computer that has loaded an expanded memory manager such as EMM or Quarterdeck's QEMM into memory. If you try to run diagnostics with either of these programs loaded, the following message will display on the screen: Cannot execute in a virtual mode. There are two ways to run the diagnostics program: 1) by booting from Drive A, or 2) by modifying the standardservices.com.pk file. Boot from Drive A 1. Insert a Toshiba operating system diskette into the floppy disk drive (FDD). 2. Turn on the computer, then proceed to the "Running the Diagnostics Program" section. Modify the standardservices.com.pk File 1. Turn on the computer and allow it to boot. 2. Deactivate the line in the standardservices.com.pk file that loads the device driver for the expanded memory manager by using the DOS batch command "REM." You may also rename the standardservices.com.pk file to keep it from executing upon bootup. 3. Reboot the computer, then proceed to the "Running the Diagnostics Program" section. Running the Diagnostics Program 1. Insert the TC Diagnostics disk in the computer’s internal floppy disk drive. 2. At the system prompt, change to Drive A (if necessary), type TESTCE66, and press Enter. TC, TC/CD, TC/CDV The following menu appears: TOSHIBA personal computer TC DIAGNOSTICS version standardservices.com.pk (c) copyright TOSHIBA Corp. 19XX DIAGNOSTICS MENU : 1 2 3 4 5 6 7 8 9 0 - DIAGNOSTIC TEST HARD DISK FORMAT HEAD CLEANING LOG UTILITIES RUNNING TEST FDD UTILITIES SYSTEM CONFIGURATION EXIT TO MS-DOS SETUP ↑ ↓ → ← : Select items Enter : Specify Esc : Exit NOTE: To exit the TC DIAGNOSTIC TEST MENU, press the Esc key. If a test program is in progress, press Ctrl + Break to exit the test program, or press Ctrl + C to stop the program. TC, TC/CD, TC/CDV 3. To select the DIAGNOSTIC TEST option from the DIAGNOSTICS MENU, set the highlight bar to 1, and press Enter. The following screen appears: TOSHIBA personal computer TC DIAGNOSTICS version standardservices.com.pk (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 2 3 4 5 6 7 8 9 10 11 88 99 - SYSTEM TEST MEMORY TEST KEYBOARD TEST DISPLAY TEST FLOPPY DISK TEST PRINTER TEST ASYNC TEST HARD DISK TEST REAL TIMER TEST NDP TEST EXPANSION TEST FDD & HDD ERROR RETRY COUNT SET EXIT TO DIAGNOSTICS MENU ↑ ↓ → ← : Select items Enter : Specify Esc : Exit Refer to Sections through for detailed descriptions of each Diagnostic Test (1 through 11). Function 88 sets the floppy disk drive and hard disk drive error retry count, and Function 99 exits the submenus of the Diagnostic Test and returns to the Diagnostic Menu. 4. Select the option you want to execute and press Enter. The following message appears: SYSTEM TEST XXXXXXX TC DIAGNOSTIC TEST standardservices.com.pk [Ctrl] + [Break] ; test end [Ctrl] + [C] ; key stop SUB-TEST PASS COUNT WRITE DATA ADDRESS : : : : XX XXXXX XX XXXXXX ERROR COUNT : XXXXX READ DATA : XX STATUS : XXX SUB-TEST MENU : 01 02 03 04 99 - ROM checksum HW status ROM Version check EEPROM ID check Exit to DIAGNOSTIC TEST MENU ↑↓→← Enter Esc TC, TC/CD, TC/CDV : Select items : Specify : Exit 5. Select the desired subtest from the menu and press Enter. The following messages appear: TEST LOOP ERROR STOP : YES : YES Use the arrow keys to move the cursor to the desired option and press Enter. Selecting YES for TEST LOOP sets the test to run continuously until it is halted by the user. Selecting NO returns the screen to the main menu after the test is complete. Selecting YES for ERROR STOP stops the test program when an error is found and displays the operation guide on the right side of the display screen as shown below: ERROR STATUS NAME [[ HALT OPERATION ]] 1: Test end 2: Continue 3: Retry These three selections have the following functions: 1: 2: 3: Terminates the test program and exits to the subtest menu. Continues the test. Restarts the test from the beginning. Use the arrow keys to move the cursor to the desired option and press Enter. Selecting NO for ERROR STOP keeps the test running even if an error is found. Table in Section describes the function of each test on the subtest menu; and Table 35 in Section describes the error codes and error status for each error. TC, TC/CD, TC/CDV Subtest Names Table lists the subtest names for each test program in the DIAGNOSTIC TESTS menu. Table Subtest Names (1/2) No. 1 Test Name SYSTEM 2 MEMORY 3 KEYBOARD 4 DISPLAY TC, TC/CD, TC/CDV Subtest No. Subtest Item 01 ROM checksum 02 03 04 01 02 03 04 05 06 07 08 01 02 03 04 01 02 03 04 05 06 07 08 09 10 11 12 13 H/W status ROM Version check EEPROM ID check RAM constant data RAM address pattern data RAM refresh Protected mode Memory module Cache memory PCMCIA memory Turbo cache memory Pressed key display () Pressed key display () Pressed key code display PS/2 Mouse VRAM write/read Character attributes Character set 80*25 Character display Graphics display (color set 0/1) * Graphics display * Graphics display Display page “H” pattern display LED/DAC pallet TFT color display F. Z connector check SVGA mode Table Subtest Names (2/2) No. Test Name Subtest No. 5 FLOPPY DISK 6 PRINTER 7 ASYNC 8 HARD DISK 9 REAL TIMER 10 11 NDP EXPANSION 01 02 03 04 05 01 02 03 01 02 03 04 05 06 01 02 03 04 05 06 07 08 09 10 01 02 03 01 01 02 03 04 Subtest Item Sequential read Sequential read/write Random address/data Write specified address Read specified address Ripple pattern Function Wraparound Wraparound (board) Not used. Point to point (send) Point to point (receive) Not used. Interrupt test (IRQ 4, 3, 5) Sequential read Address uniqueness Random address/data Cross talk & peak shift Write/read/compare (CE) Write specified address Read specified address ECC circuit Sequential write W-R-C specified address Real time Backup memory Real time carry NDP test Not used. Wraparound (F32BUS) PCMCIA wraparound SCSI interface check TC, TC/CD, TC/CDV System Test To execute the System Test, select 1 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 ROM checksum The ROM checksum tests the system board from address Fh to FFFFFh (64KB). Subtest 02 H/W status This test reads and displays the hardware status as shown below: H/W status = Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 — — — — — — — — Notch signal FDD type Drive A/B External FDD = = = = = = = = 2DD 2MB Ext. = A OFF Table describes the hardware bit status for each bit tested. Pressing Enter returns you to the subtest menu. Table Hardware Bit Status Bit H/W Status 1 0 7 Reserved — — 6 Reserved — — 5 Media type 2DD 2HD 4 FDD type MB 2 MB 3 Reserved — — 2 Drive A/B Ext. = A Ext. = B 1 External FDD ON OFF 0 Reserved — — TC, TC/CD, TC/CDV Subtest 03 ROM Version check This subtest checks the version of the following items: ❑ BIOS ROM ❑ SCC version The subtest compares these items to the reference data stored in the test program. When the read information is lower than the reference data, the test program displays the following screen image. ROM-BIOS SCC Version = V : OK V = V : NG V Reference data Current data When the read information is higher, the display is unchanged. To exit this screen, press the S key. Subtest 04 EEPROM ID check This subtest checks the EEPROM ID number through the KBC. TC, TC/CD, TC/CDV Memory Test To execute the Memory Test, select 2 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 RAM constant data (real mode) This subtest writes constant data to conventional memory (0 to KB), then reads the new data and compares the results with the original data. The constant data is FFFFh, AAAAh, h, and h. Subtest 02 RAM address pattern data (real mode) This subtest writes address pattern data created by the exclusive-ORing (XORing) to the address segment and address offset in conventional memory (0 program end to KB), then reads the new data and compares the results with the original data. Subtest 03 RAM refresh (real mode) This subtest writes a byte unit of constant data to conventional memory (0 to KB), then reads the new data and compares the results with the original data. The constant data is AAAAh and h. NOTE: There is a short delay between write and read operations, depending on the size of the data. Subtest 04 Protected mode NOTE: The standardservices.com.pk file must be configured without expanded memory manager programs such as EMMEXE, EMMSYS or QEMMSYS. Also, the standardservices.com.pk must be deleted from the standardservices.com.pk file. This subtest writes constant data and address data to extended memory (maximum address h), then reads new data and compares the results with the original data. The constant data is FFh, AAh, 55h, and 00h. TC, TC/CD, TC/CDV Subtest 05 Memory module NOTE: To execute this subtest, an optional memory card must be installed in the computer. This subtest functions the same as Subtest 04, except it is used for testing an optional memory card. Memory module capacities are 2, 4, 8, and 16 MB. After selecting Subtest 05, the following message appears: Extended memory size ( MB, MB, MB, MB) ? Select the number that corresponds to the memory card installed in the computer. Subtest 06 Cache memory To test the cache memory, a pass-through write-read comparison of ‘5A’ data is run repeatedly to the test area (‘’:’Program’ size to ‘’:=7FFF’ (32 KB)) to check the hit-miss ratio (on/off status). One test takes three (3) seconds. The 8 KB cache memory is tested. Number of miss hit < Number of hit → OK Number of miss hit ≥ Number of hit → Fail Subtest 07 PCMCIA Memory NOTE: To execute this test, a PCMCIA memory card must be installed in the computer. This subtest divides the PCMCIA window (Dh to DFFFFh) into 64 KB increments. It then executes the subtest by writing constant data to the PCMCIA memory, reads the data, and then compares it with the original data. Subtest 08 Turbo cache memory NOTE: To execute this test, a turbo cache memory module must be installed in the computer. After checking the connection of the turbo cache module, this subtest transfers the test program to the test area (‘’:Program size to ‘’FFF’ 32 KB). To test the turbo cache memory, a pass-through write-read comparison of ‘5A’ data is run repeatedly to the test area to check the hit-miss ratio (on/off status). One test takes 3 seconds, and tests the KB turbo cache memory. Number of miss hit < Number of hit → OK Number of miss hit ≥ Number of hit → Fail TC, TC/CD, TC/CDV Keyboard Test To execute the Keyboard Test, select 3 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. The Keyboard Test contains two subtests that test the TC’s keyboard actions. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 Pressed key display () NOTE: The Num Lock and the Overlay mode must be off to execute this subtest. When you execute this subtest, the key keyboard layout is drawn on the display. When any key is pressed, the corresponding key on the screen changes to an “*” character. Holding a key down enables the auto-repeat function which causes the key’s display character to blink. Subtest 02 Pressed key display () NOTE: The Num Lock and the Overlay mode must be off to execute this subtest. When you execute this subtest, the key keyboard layout is drawn on the display. When any key is pressed, the corresponding key on the screen changes to an “*” character. Holding a key down enables the auto-repeat function which causes the key’s display character to blink. TC, TC/CD, TC/CDV Subtest 03 Pressed key code display When a key is pressed, the scan code, character code, and keytop name are displayed on the screen in the format shown below. The Ins, Caps Lock, Num Lock, Scroll Lock, Alt, Ctrl, Left Shift, and Right Shift keys are displayed in reverse screen mode when pressed. The scan codes, character codes, and keytop names are shown in Appendix E. KEYBOARD TEST IN PROGRESS Scan code Character code Keytop Ins Lock Alt Caps Lock Ctrl = = = Num Lock Left Shift Scroll Lock Right Shift PRESS [Enter] KEY Subtest 04 PS/2 mouse NOTE: To execute the PS/2 mouse connect check, a PS/2 mouse must be connected to the computer. This subtest checks whether or not a PS/2 mouse is connected to the computer. If this test does not detect an error, it returns to the subtest menu. If it detects an error, the following message appears: KBC - MOUSE INTERFACE ERROR [[ HALT OPERATION ]] 1: 2: 3: Test end Continue Retry TC, TC/CD, TC/CDV Display Test To execute the Display Test, select 4 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. The Display Test contains 13 subtests that test the TC’s display in various modes. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 VRAM Read/Write This subtest writes constant data FFFFh, AAAAh, h, h and address data to video RAM (KB). The data is then read from the video RAM and compared to the original data. Subtest 02 Character Attributes (modes 1 and 13h) This subtest displays the following character attribute modes; normal, intensified, reverse, and blinking as shown in the display below. The character attribute modes display the foreground color and intensified color (16 colors or level gray scale) using black, blue, red, magenta, green, cyan, yellow, and white from the color display. The display below appears on the screen when this subtest is executed. CHARACTER ATTRIBUTES NEXT LINE SHOWS NORMAL DISPLAY. NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NEXT LINE SHOWS INTENSIFIED DISPLAY. IIIIIIIIIIIIIIIIIIIIIIIIIIIIII NEXT LINE SHOWS REVERSE DISPLAY. RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR NEXT LINE SHOWS BLINKING DISPLAY BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB 00 01 04 05 02 03 06 07 08 09 0C 0D 0A 0B 0E 0F ; ; ; ; ; ; ; ; BLACK BLUE RED MAGENTA GREEN CYAN YELLOW WHITE PRESS [Enter] KEY TC, TC/CD, TC/CDV After pressing Enter, 16 colors or 16 gray scales of mode 13h appear in the x graphics mode as shown below. * GRAPHICS DISPLAY [ 13 ] BLACK BLUE GREEN CYAN RED MAGENTA BROWN WHITE GRAY LIGHT BLUE LIGHT GREEN LIGHT CYAN LIGHT RED LIGHT MAGENTA YELLOW INTENSE WHITE PRESS [Enter] KEY Pressing Enter toggles between the two tests. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. Subtest 03 Character Set In this subtest, the character set (addressed 00h to FFh) is displayed in the 40*25 character mode as shown below. Press [Enter] KEY To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. TC, TC/CD, TC/CDV Subtest 04 80x25 Character Display (mode 12) In this subtest, the character string is displayed shifting one character to the right, line by line in the 80x25 and 80x25 character modes as shown below. 80*XX CHARACTER DISPLAY !”#$%&’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklm !”#$%&’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmn “#$%&’()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmno #$%&’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnop $%&’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopq %&’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqr &’()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrs ‘()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrst ()*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstu )*+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuv *+,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvw +,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwx ,-./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxy -./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz ./;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{ /;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{| ;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{|} ;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{|}~ ;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{|}~∆ ;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{|}~∆Ç ;<=>[email&#;protected][\]^_‘abcdefghijklmnopqrstuvwxyz{|}~∆Çü PRESS [ENTER] KEY Pressing Enter toggles between the two tests. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. Subtest 05 Character Display (mode 4,D) This subtest displays two color sets for the color display in x dot graphics modes 4 and D. One example is shown below: * GRAPHICS DISPLAY COLOR SET X : [X] GREEN CYAN RED MAGENTA YELLOW WHITE PRESS [ENTER] KEY Pressing Enter toggles between the two tests. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. TC, TC/CD, TC/CDV Subtest 06 x Graphics Display (modes 6 and E) This subtest displays even dots, odd dots, and all dots in the x dot graphics modes 6 and E as shown below. * GRAPHICS DISPLAY : [X] EVEN DOTS DRIVEN ODD DOTS DRIVEN ALL DOTS DRIVEN PRESS [Enter] KEY To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. Subtest 07 x Graphics Display (modes 10, 74, and 12) This subtest displays even dots, odd dots, and all dots in the x, x and x dot graphics modes 10 and 12 as shown below. *XXX GRAPHICS DISPLAY EVEN DOTS DRIVEN ODD DOTS DRIVEN ALL DOTS DRIVEN PRESS [Enter] KEY Pressing Enter changes the size of the displayed image. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. TC, TC/CD, TC/CDV Subtest 08 Display Page This subtest confirms that the pages can be changed in order from page 0 through page 7 in 40*25 character mode. DISPLAY PAGE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 After completion of the test, press Ctrl + Break to exit this subtest and return to the DISPLAY TEST menu. Subtest 09 H Pattern Display This subtest displays H characters on the entire screen, as illustrated below. HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. TC, TC/CD, TC/CDV Subtest 10 LED/DAC Pallet This subtest checks the indicator on the keyboard (Caps Lock, Num Lock, and Scroll Lock) by key operation. [ Speed/CRT/Caps/Num/Scroll LED test ] (1) Press (2) Press (3) Press [ Caps Lock ] key !Caps [ Num Lock ] key !Num [ Scroll Lock] key !Scroll (on/off) (on/off) (on/off) PRESS [Enter] KEY Press Enter to display the following messages: [ DAC pallet W-R-CMP test ] = (about 5 seconds) [ Processor latch test ] = Processor latch test ( times, 2:endless) ? Select either 1 ( times) or 2 (endless), and press Enter. After pressing Enter, the subtest writes ‘2A’ and ‘15’ data to 6 bits of x3 (RGB), then reads new data and compares the results with the original data. Upon completion of the test, the message “OK” displays, then the screen returns to the subtest menu. Subtest 11 TFT color display This subtest displays seven screens. The first shows a color band across the screen, the next three screens display 64 gradations (mode ‘13’) of red, green, and blue successively, and the last three display gradations (mode ‘5F’) of red, green, and blue. Press Enter to change the display. Press Ctrl + Break to exit. Subtest 12 F. Z Connector check This subtest checks the Z-connector and Feature connector using a special connector. Subtest 13 SVGA mode This subtest displays seven screens. The first shows many colors at once, the next three display 64 gradations (mode ‘5D’) of red, green, and blue successively, and the last three display gradations (mode ‘60’) of red, green, and blue. Press Enter to change the display. Press Ctrl + Break to exit. TC, TC/CD, TC/CDV Floppy Disk Test CAUTION: Before running the floppy disk test, prepare a formatted work disk since the contents of the floppy disk in the FDD will be reased. Remove the Diagnostics Disk and insert the work disk into the FDD. To execute the Floppy Disk Test, select 5 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. The Floppy Disk test contains five subtests that test the TC’s internal floppy disk drive. The following messages appear after selecting the Floppy Disk Test. Answer each question with an appropriate response to execute the test. 1. Select the test drive number of the floppy disk drive to be tested and press Enter. Test drive number select (1:FDD#1,2:FDD#2,0:FDD1&2) ? 2. Select the media type of the floppy disk in the test drive to be tested, and press Enter. Media in Drive #X mode (DD,D,D-2HD/2DD,HD) ? 3. Select the track you want the test to start on and press Enter. Simply pressing Enter sets the start track to zero. Test start track 4. (Enter:0/dd) ? The floppy disk test menu will appear after you select the start track number. Select the number of the subtest you want to execute and press Enter. The following message will appear during the floppy disk test. SYSTEM TEST XXXXXXX TC DIAGNOSTIC TEST standardservices.com.pk [Ctrl] + [Break] ; test end [Ctrl] + [C] ; key stop SUB-TEST PASS COUNT WRITE DATA ADDRESS : : : : XX XXXXX XX XXXXXX ERROR COUNT READ DATA STATUS : XXXXX : XX : XXX The first three digits in the ADDRESS number indicate which cylinder is being tested. The fourth digit indicates the head, and the last two digits indicate the sector being tested. The first digit in the STATUS number indicates the drive being tested, and the last two digits indicate the error status code as explained in Table in Section TC, TC/CD, TC/CDV Subtest 01 Sequential Read This subtest performs a Cyclic Redundancy Check (CRC) that continuously reads all the tracks on a floppy disk. The following tracks are read according to the media type in the floppy disk drive: ❑ Double-sided, double-density (2D): Tracks 0 to ❑ Double-sided, double-density, double-track (2DD); and double-sided, high-density, double-track (2HD): Tracks 0 to The start track is specified when the FDD test is started from the Diagnostic Test Menu. Refer to Step 3 at the beginning of this section to set the start track. Subtest 02 Sequential Read/Write This subtest continuously writes data pattern B5ADADh to all the specified tracks selected in Subtest The data is then read and compared to the original data. Subtest 03 Random Address/Data This subtest writes random data to random addresses on all tracks defined in Subtest The data is then read and compared to the original data. Subtest 04 Write Specified Address This subtest writes specified data to a specified track, head, and address. Subtest 05 Read Specified Address This subtest reads data from a specified track, head, and address. TC, TC/CD, TC/CDV Printer Test To execute the Printer Test, select 6 from the DIAGNOSTIC TEST menu, press Enter, and follow the directions displayed on the screen. The Printer Test contains three subtests that test the output of the printer connected to the TC. NOTE: An IBM-compatible printer must be connected to the system to execute this test. Make sure the setup option "External FDD/PRT" is set to "PRT" (Printer). The following message will appear when the printer test is selected: Channel#1 = XXXXh Channel#2 = XXXXh Channel#3 = XXXXh Select the channel number () ? The printer I/O port address is specified by the XXXXh number. The TC supports three printer channels. Select the printer channel number, and press Enter to execute the selected subtest. Subtest 01 Ripple Pattern This subtest prints characters for codes 20h through 7Eh line-by-line while shifting one character to the left at the beginning of each new line. !"#$%£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmno !"#$%£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnop "#$%£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopq #$%£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqr $%£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrs %£'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrst £'()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrstu '()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrstuv ()*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrstuvw )*+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrstuvwx *+,-./;<=>[email&#;protected][\]^_`abcdefghijklmnopqrstuvwxy TC, TC/CD, TC/CDV Subtest 02 Function This subtest is for IBM-compatible printers, and tests the following functions: ❑ ❑ ❑ ❑ ❑ ❑ Normal print Double-width print Compressed print Emphasized print Double-strike print All characters print The subtest prints the various print types shown below: PRINTER TEST 1. THIS LINE SHOWS NORMAL PRINT. 2. THIS LINE SHOWS DOUBLE-WIDTH PRINT. 3. THIS LINE SHOWS COMPRESSED PRINT. 4. THIS LINE SHOWS EMPHASIZED PRINT. 5. THIS LINE SHOWS DOUBLE-STRIKE PRINT. 6. ALL CHARACTERS PRINT !"#$%&'()*+,./;<=>[email&#;protected]
