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Toshiba T4700CS Maintenance Manual
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Toshiba T4700CS Maintenance Manual

Toshiba T4700CS Maintenance Manual

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1.1
Features
The Toshiba T4700CS/T4700CT/T4800CT is one of the lightest and most advanced portable
computers available. Utilizing advanced technology and high-speed components, the
T4700CS/T4700CT/T4800CT offers excellent color display legibility, battery operation and
IBM PC/AT compatibility. The T4700CS/T4700CT/T4800CT system unit consists of the
following features:
Microprocessor
The T4700CS/T4700CT uses an SL Enhanced Intel 486
(referred to as 486DX2 in this manual) that operates at 50 MHz, 3.3 Volts.
The T4800CT uses an SL Enhanced Intel 486
486DX4 in this manual) that operates at 75 MHz, 3.3 Volts.
Math co-processor
The T4700CS/T4700CT has a math co-processor which is stored in the 486DX2.
The T4800CT has a math co-processor which is stored in the 486DX4.
Cache memory
The T4700CS/T4700CT has an 8 KB cache memory which is stored in the 486DX2.
The T4800CT has an 16-KB cache memory which is stored in the 486DX4.
Disk storage
The T4700CS/T4700CT has an internal 200- or 320-Megabyte (MB) Hard Disk Drive
(HDD) with an average access time of 12 milliseconds. A 3.5-inch Floppy Disk Drive
(FDD) supports 2HD floppy disks (1.44 Mbytes) and 2DD floppy disks (720 Kbytes).
The T4800CT has an internal 320 or 500 MB HDD with an average access time of 12
milliseconds. A 3.5-inch FDD supports 2HD floppy disks (1.44 Mbytes) and 2DD
floppy disks (720 Kbytes).
Memory
The T4700CS/T4700CT/T4800CT comes standard with 8 MB of CMOS Random
Access Memory (RAM) 3.3 Volts. This includes 640 KB of conventional memory and
7,424 KB of extended memory which can be utilized as expanded memory compatible
with the Lotus/Intel/Microsoft Expanded Memory Specifications (LIM-EMS).
T4700CS, T4700CT, T4800CT
TM
DX2 Microprocessor
TM
DX4 Microprocessor (referred to as
1-1

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Summary of Contents for Toshiba T4700CS

  • Page 1 The T4800CT has a math co-processor which is stored in the 486DX4. Cache memory The T4700CS/T4700CT has an 8 KB cache memory which is stored in the 486DX2. The T4800CT has an 16-KB cache memory which is stored in the 486DX4.
  • Page 2 The T4700CS/T4700CT/T4800CT has three different batteries: a main battery, a backup battery, and a Real Time Clock (RTC) battery. Status indicator panel The T4700CS/T4700CT/T4800CT has a status indicator panel. It is a liquid crystal display (LCD) panel which displays battery charge indicator and 11 icons indicating the system status.
  • Page 3 RS-232C port The T4700CS/T4700CT/T4800CT has one 9-pin serial interface port. Mouse port The T4700CS/T4700CT/T4800CT has one 6-pin mouse port on the back that can be connected to an IBM PS/2 mouse. Keyboard port The T4700CS/T4700CT/T4800CT has one 6-pin keyboard port on the back that can be connected to an IBM PS/2 keyboard.
  • Page 4 The T4700CS/T4700CT/T4800CT Personal Computer is shown in figure 1-1. The system configuration is shown in figure 1-2. Figure 1-1 T4700CS/T4700CT/T4800CT personal computer Figure 1-2 T4700CS/T4700CT/T4800CT system unit configuration T4700CS, T4700CT, T4800CT...
  • Page 5 System Unit Block Diagram Figure 1-3 is a block diagram of the T4700CS/T4700CT/T4800CT system unit. Figure 1-3 T4700CS/T4700CT/T4800CT system board block diagram T4700CS, T4700CT, T4800CT...
  • Page 6 The T4700CS/T4700CT/T4800CT system board shown in figure 1-3 is composed of the following major components: A 486DX2-50 (T4700CS/T4700CT) CPU, which incorporates a math co- processor and 8 KB cache memory. A 486DX4-75 (T4800CT) CPU, which incorporates a math co-processor and 16 KB cache memory.
  • Page 7 One AD1848 chip is used. The AD1848 controls the internal sound system. Clock Generator receives 14.31818 MHz (X1) and generates the following frequen- cies: • 25 MHz for the CPU (CPU operates 50MHz[T4700CS/T4700CT] or 75MHz [T4800CT]) • 14.7456 MHz for the COM •...
  • Page 8 IC Card Controller Gate Array This gate array has following functions: • IC Card Controller - PCMCIA IC Card Controller - Toshiba Modem Card Controller • EEPROM (for security) Controller - KBC-Security-EEPROM Communication Controller • Others - KBC Communication Controller...
  • Page 9 The T4700CS/T4700CT/T4800CT 3.5-inch Floppy Disk Drive (FDD) is a thin, high-perfor- mance reliable drive that supports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks. The T4700CS/T4700CT/T4800CT FDD is shown in figure 1-4. The specifications for the FDD are described in table 1-1. Figure 1-4 3.5-inch FDD Table 1-1 3.5-inch FDD specifications...
  • Page 10 The Hard Disk Drive (HDD) is a random access non-volatile storage device. It has a non- removable 2.5-inch magnetic disk and mini-winchester type magnetic heads. T4700CS/T4700CT supports the 200 MB and 320 MB. T4800CT supports the 320 MB and 500 MB.
  • Page 11 Keyboard The 82-(USA) or 84-(European) keyboard is mounted on the T4700CS/T4700CT/ T4800CT’s system unit. The keyboard is connected to the keyboard controller on the system board through a 19-pin flat cable. The keyboard is shown in figure 1-6. See Appendix F for optional keyboard configurations.
  • Page 12 1.6.1 STN Color LCD Module The T4700CS STN color LCD is backlit and supports 640x480 pixels with a Video control- ler. This video controller includes the functions of Video Graphics Array (VGA). The T4700CS’s LCD receives vertical and horizontal synchronizing signals, 16-bit data signal (8-bit upper block data signal, 8-bit lower block data signal), display enable signal, and shift clock for data transmission.
  • Page 13 The FL inverter board supplies high frequency current to light the LCD’s Fluorescent Lamp. The specifications for the FL inverter are described in table 1-4. Table 1-4 STN color FL inverter board specifications Item Specifications Input Voltage (VDC) Power 4.17 Output Voltage (VAC) 1,100 Current (mA) Frequency (KHz) T4700CS, T4700CT, T4800CT 1-13...
  • Page 14 Figure 1-8 TFT color LCD Table 1-5 TFT color LCD specifications Item Specifications Number of dots (dots) 640x480 Dot pitch (mm) 0.3 (W)x0.3 (H) Display area (mm) 192 (W)x144 (H) Contrast 60:1 (minimum) FL current (mA) FL frequency (KHz) 1-14 T4700CS, T4700CT, T4800CT...
  • Page 15 The specifications for the FL inverter are described in table 1-6. Table 1-6 FL inverter board specifications Item Specifications Input Voltage (VDC) Power Output Voltage (VAC) 1,100 Current (mA) Frequency (KHz) Current limits (mA) 3.0 to 6.0 T4700CS, T4700CT, T4800CT 1-15...
  • Page 16 Power Supply The power supply supplies five kinds of voltages to the T4700CS/T4700CT/T4800CT system board. The T4700CS/T4700CT/T4800CT power supply has one microprocessor and it operates at 500 KHz (power off) or 20 MHz (power on). It contains the following func- tions: Determines if the AC adapter or battery is connected to the computer.
  • Page 17 Batteries The T4700CS/T4700CT/T4800CT has three types of batteries: Main battery pack Backup battery Real Time Clock (RTC) battery These batteries’ specifications are described in table 1-8. Table 1-8 Batteries' specifications Battery name Material Output voltage Capacity Main battery Nickel Metal Hydride...
  • Page 18 The battery or output voltage is abnormal. Trickle Battery Charge When the main battery is fully charged and the AC adapter is attached, the micropro- cessor automatically changes quick charge 1 or 2 to trickle charge. 1-18 T4700CS, T4700CT, T4800CT...
  • Page 19 Table 1-11 shows the charging time and data preservation period of the RTC battery. Table 1-11 RTC battery charging/data preservation time Time Charging Time Power On 24 H Power Off 24 H Data preservation period (full charge) 1 month T4700CS, T4700CT, T4800CT 1-19...
  • Page 20 1-20 T4700CS, T4700CT, T4800CT...
  • Page 21 Troubleshooting Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the T4700CS/ T4700CT/T4800CT is causing the computer to malfunction. The FRUs covered are: Power Supply Board System Board(s) Floppy Disk Drive Hard Disk Drive Keyboard Display...
  • Page 22 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. Non- Toshiba operating systems can cause the computer to malfunction.
  • Page 23 Figure 2-1 Troubleshooting flowchart (1/2) T4700CS, T4700CT, T4800CT...
  • Page 24 If an error is detected on the floppy disk test, perform the floppy disk drive troubleshooting procedures in section 2.5. If an error is detected on the hard disk test, perform the hard disk drive troubleshooting procedures in section 2.6. T4700CS, T4700CT, T4800CT...
  • Page 25 Power Supply Troubleshooting The T4700CS/T4700CT/T4800CT’s power supply controls many functions and components in the T4700CS/T4700CT/T4800CT. To determine if the power supply is functioning prop- erly, start with Procedure 1 and continue with the other Procedures as instructed. The procedures described in this section are:...
  • Page 26 Table 2-2 Outline of power supply error Status Source of Error AC Adapter or Desk Station IV error Battery error VCC Output error B3V Output error 12V Output or M12V Output error Power Supply Microcomputer error Power On error Environment T4700CS, T4700CT, T4800CT...
  • Page 27 Output Voltage (12V or M12V) Status Meaning 12V Voltage is over the maximum allowed limit. 12V Voltage is below the minimum allowed limit. M12V Voltage is not within the normal range. Power Supply Microprocessor Status Meaning Firmware error. Program error. T4700CS, T4700CT, T4800CT...
  • Page 28 20°C degrees until its internal temperature is within that range. If the status still exists, go to Procedure 4. Check 6 When P20, P21, P22, P30, P31, P32, P33, P40, P41, P42, P50 or P60 is displayed, go to Procedure 4. T4700CS, T4700CT, T4800CT...
  • Page 29 Connect a new AC adapter. If the battery capacity does not change on status indicator panel, go to Check 3. Check 3 Make sure the battery pack is installed in the computer correctly. If the battery pack is installed correctly, go to Procedure 3. T4700CS, T4700CT, T4800CT...
  • Page 30 The power supply may not charge the battery pack. Perform the following procedures: Install the battery pack to the T4700CS/T4700CT/T4800CT. Attach the AC adapter to T4700CS/T4700CT/T4800CT, then turn on the power. (If you cannot turn on the power, go to Procedure 4.) Run the Diagnostic test, following the steps described in chapter 3, and select the system configurations.
  • Page 31 Replacement Check The power supply board or system board(s) may be disconnected or damaged. Disassemble the T4700CS/T4700CT/T4800CT following the steps described in chapter 4, Replacement Procedures, and check the connection between power supply board and system board(s) and status indicator panel. After checking the connection, perform the following checks: Check 1 Replace the power supply board with a new one.
  • Page 32 Procedure 1: Message Check Procedure 2: Printer Port LED Check on Boot mode Procedure 3: Printer Port LED Check on Resume Mode Procedure 4: Diagnostic Test Program Execution Check Procedure 5: Connection and Replacement Check 2-12 T4700CS, T4700CT, T4800CT...
  • Page 33 If an error message is shown on the display, perform Check 1. If there is no error message, go to Procedure 2. If the Toshiba MS-DOS is properly loaded, go to Procedure 3. If one of the following error messages is displayed on the screen, press the F1 key Check 1 as the message instructs.
  • Page 34 (17) PIC #2 ERROR (18) KEYBOARD ERROR (19) KBC ERROR (20) HDC ERROR (21) HDD #0 ERROR (22) HDD #1 ERROR (23) NO FDD ERROR (24) FDD ERROR (25) TIMER INTERRUPT ERROR (26) RTC UPDATE ERROR 2-14 T4700CS, T4700CT, T4800CT...

  • Page 35: Check

    Plug the printer port LED into the T4700CS/T4700CT/T4800CT’s PRT/FDD connector. Hold down the space bar and turn on the T4700CS/T4700CT/T4800CT’s power. Read the LED status from left to right as you are facing the back of the computer. Convert the status from binary to hexadecimal notation.
  • Page 36 ADDRESS = XXXXXXXXH READ DATA = XXXXXXXXH WRITE DATA = XXXXXXXXH EXTENDED MEMORY PARITY ERROR ADDRESS = XXXX0000H - XXXXFFFFH DMA page register test DMA PAGE REGISTER ERROR READ DATA = XXH WRITE DATA = XXH 2-16 T4700CS, T4700CT, T4800CT...
  • Page 37 2.7. Check 3 If error code 5Ah is displayed, go to the HDD Troubleshooting Procedures in section 2.6. Check 4 If error code 60h is displayed, go to the FDD Troubleshooting Procedures in section 2.5. T4700CS, T4700CT, T4800CT 2-17...
  • Page 38 PRT and set to resume mode. To use the printer port LED follow these steps: Turn on the T4700CS/T4700CT/T4800CT’s power, then set to resume mode. Turn off the T4700CS/T4700CT/T4800CT’s power Plug the printer port LED into the T4700CS/T4700CT/T4800CT’s PRT/FDD connector.
  • Page 39 Diagnostic,” for more information on how to perform these tests. System test Memory test Printer test ASYNC test Real Timer test NDP test Expansion test If an error is detected during these tests, go to Procedure 5. T4700CS, T4700CT, T4800CT 2-19...
  • Page 40 Procedure 5 Connection and Replacement Check The system board(s) may be disconnected or damaged. Disassemble the T4700CS/T4700CT/ T4800CT following the steps described in chapter 4, Replacement Procedures, and check the connection between upper system board and lower system board, and other components.
  • Page 41 Floppy Disk Drive Troubleshooting This section describes how to determine if the T4700CS/T4700CT/T4800CT’s internal 3.5- inch floppy disk drive is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required. Procedure 1:...

  • Page 42: Check

    FDD head cleaning is one option available in the Diagnostic Program. Detailed operation is given in Chapter 3, Test 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 Proce- dure 3.
  • Page 43 Procedure 3 Diagnostic Test Program Execution Check The Floppy Disk Drive Diagnostic Test program is stored on the T4700CS/T4700CT/ T4800CT Diagnostics Disk. After loading Toshiba MS-DOS, run the diagnostic program. Refer to Chapter 3, Test and Diagnostics, for more information about the diagnostics test procedures.
  • Page 44 The 3.5-inch Floppy Disk Drive is connected to the system unit by the FDD cable. This cable may be disconnected from the system board or damaged. Disassemble the T4700CS/ T4700CT/T4800CT following the steps described in Chapter 4, Replacement Procedures and...
  • Page 45 CAUTION: The contents of the hard disk will be erased when the HDD troubleshoot- ing 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.

  • Page 46: Check

    Procedure 1 Partition Check Insert the Toshiba MS-DOS system disk and turn on the computer. Then perform the follow- ing 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.
  • Page 47 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.
  • Page 48 The HDD is stored inside the HDD pack. The HDD pack connector is connected between HDD and the lower system board. This connector may be disconnected from the lower system board or HDD. Disassemble the T4700CS/T4700CT/T4800CT following the steps described in chapter 4, Replacement Procedures, and perform the following checks:...

  • Page 49: Check

    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 T4700CS/T4700CT/T4800CT Diagnostic Disk, format the HDD with a low level format option.
  • Page 50 Procedure 5 Diagnostic Test Program Execution Check The HDD test program is stored in the T4700CS/T4700CT/T4800CT Diagnostics Disk. Perform all of the HDD tests in the Hard Disk Drive Test. Refer to Chapter 3, Test and Diagnostics, for more information about the HDD test program.
  • Page 51 The HDD peripheral component is composed of HDD, HDD pack connector, lower system board, and upper system board. If one of the components may be damaged, disassemble the T4700CS/T4700CT/T4800CT following the steps described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Replace the HDD with a new one.
  • Page 52 Keyboard Troubleshooting To determine if the T4700CS/T4700CT/T4800CT’s keyboard is functioning properly, per- form 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...
  • Page 53 Connector and Replacement Check The keyboard is connected to the system board by a 19-pin flat cable. This cable may be disconnected or damaged. Disassemble the T4700CS/T4700CT/T4800CT as described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Make sure the keyboard cable is not damaged and is connected to the upper system board.
  • Page 54 Display Troubleshooting This section describes how to determine if the T4700CS/T4700CT/T4800CT’s display is functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Brightness and Contrast Control Check Procedure 2: External CRT Check Procedure 3:...
  • Page 55 Note: Use of of the Fn+F5 hotkey for display selection has different effects on the T4700CS and T4700CT/T4800CT. For the T4700CS, the effect of the Fn+F5 hotkey depends on the Power on display setting, as follows: (a) Simultaneous:Toggles between Internal and Simultaneous (SVGA is not supported).
  • Page 56 Decreases the brightness of the LCD panel. Pressing the Fn+arrow key increases or decreases the contrast of STN color Check 4 LCD. Increases the contrast of the STN color LCD panel. Decreases the contrast of the STN color LCD panel. 2-36 T4700CS, T4700CT, T4800CT...
  • Page 57 Diagnostic Test Program Execution Check The Display Test program is stored on the T4700CS/T4700CT/T4800CT Diagnostic Disk. This program checks the display controller on the system board. After loading Toshiba MS- DOS, run the Diagnostic Program. Refer to Chapter 3, Test and Diagnostics, for details.
  • Page 58 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. FL unit FL inverter board System board LCD unit Display switch Figure 2-3 T4700CS display connection FL unit FL inverter board System board CN11 CN12 LCD unit...
  • Page 59 The upper system board may be damaged. Replace the upper system board with a new one and test the display again. If the problem still exists, perform Check 7. Check 7 Replace the lower system board with a new one. 2-39 T4700CS, T4700CT, T4800CT...
  • Page 60 Status Indicator Panel Troubleshooting To determine if the T4700CS/T4700CT/T4800CT’s Status Indicator Panel 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:...
  • Page 61 Procedure 2 Connector and Replacement Check The status indicator panelis connected to the system board. This cable may be disconnected or damaged. Disassemble the T4700CS/T4700CT/T4800CT as described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Make sure the status indicator panel cable is not damaged and is connected to the system board.
  • Page 62 2-42 T4700CS, T4700CT, T4800CT...
  • Page 63 NDP TEST EXPANSION TEST The following equipment is needed to perform some test programs. T4700CS/T4700CT/T4800CT Diagnostics Disk (all tests) Formatted working disk for the floppy disk drive test (all tests) 3.5-inch 2HD/2DD disk for internal 3.5-inch FDD 5.25-inch 2D disk for external 5.25-inch FDD...
  • Page 64 Executing the DiagnosticTest Toshiba MS-DOS is required to run the T4700CS/T4700CT/T4800CT DIAGNOSTICS PROGRAM. NOTE: Diagnostics cannot be run with expanded memory managers such as EMM386 or Quarterdeck QEMM in memory. Attempting to run diagnostics with either program loaded will cause the following message to display: Cannot execute in a virtual 8086 mode.
  • Page 65 The following menu appears: TOSHIBA personal computer TXXXX DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTICS MENU : 1 - DIAGNOSTIC TEST 2 - HARD DISK FORMAT 4 - HEAD CLEANING 5 - LOG UTILITIES 6 - RUNNING TEST...
  • Page 66 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 TXXXX DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 - SYSTEM TEST...
  • Page 67 Selecting NO for ERROR STOP keeps a test running even if an error is found. Table 3-1 in section 3.3 describes each subtest menu test function; Table 3-3 in section 3.14 lists codes and status for each error. T4700CS, T4700CT, T4800CT...
  • Page 68 320*200 Graphics display 640*200 Graphics display 640*350/400/480 Graphics display Display page “H” pattern display/Border color LED/DAC pallet TFT color display Status indicator panel WD90C24A Bitblt (T4700CS only) Sequential read Sequential read/write Random address/data Write specified address Read specified address PRINTER Ripple pattern...
  • Page 69 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 TIMER Real time Backup memory Real time carry EXPANSION PCMCIA Wraparound T4700CS, T4700CT, T4800CT...
  • Page 70 Table 3-2 lists hardware bit status for each bit tested. Press Enter to return to the Subtest Menu. Table 3-2 Hardware Bit Status H/W status Reserved — — CPU clock speed 50 MHz (T4700CS/CT) 50 MHz (T4700CS/CT) 75 MHz (T4800CT) 75 MHz (T4800CT) Media type FDD type 1.6 MB 2 MB Reserved —...
  • Page 71 = V1.00 : NG V0.90 PS Micom Version = V1.40 : OK V1.40 Reference data Current data Subtest 04 Main battery check This subtest executes the quick charge to main battery, and the following message is displayed. [Main battery charge] T4700CS, T4700CT, T4800CT...
  • Page 72 Protected mode This subtest writes constant data and address data to extended memory (maxi- mum address 100000h) then reads new data and compares the result with original data. Constant data is FFh, AAh, 55h, and 00h. 3-10 T4700CS, T4700CT, T4800CT...
  • Page 73 (‘7000’:’Program’ size to ‘7000’:=7FFF’ (32 KB)) to check hit-miss ratio (on/off status). One test takes 3 seconds. Number of miss hit < Number of hit → OK Number of miss hit > Number of hit → Fail 3-11 T4700CS, T4700CT, T4800CT...
  • Page 74 “*” character. Holding a key down enables the auto-repeat function which causes the key display character to blink. KEYBOARD TEST IN PROGRESS 301000 PrtSc [Alt] + [SysReq] Pause [Ctrl]+[Break] to test end If test OK, Press [Del] then [Enter] Key 3-12 T4700CS, T4700CT, T4800CT...
  • Page 75 If no error is detected, it returns to the subtest menu. If an error is detected, the following message appears: KBC - MOUSE INTERFACE ERROR [[ HALT OPERATION ]] 1: Test end 2: Continue 3: Retry 3-13 T4700CS, T4700CT, T4800CT...
  • Page 76 BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB 00 08 ; BLACK 01 09 ; BLUE 04 0C ; RED 05 0D ; MAGENTA 02 0A ; GREEN 03 0B ; CYAN 06 0E ; YELLOW 07 0F ; WHITE PRESS [Enter] KEY 3-14 T4700CS, T4700CT, T4800CT...
  • Page 77 Character Set In this subtest, the character set (address 00h to FFh) is displayed in the 40*25 character mode as shown below. Press [Enter] KEY To exit to the DISPLAY TEST menu, press Ctrl + Break . 3-15 T4700CS, T4700CT, T4800CT...
  • Page 78 4 and D. One example is shown below: 320*200 GRAPHICS DISPLAY COLOR SET X : [X] GREEN BROWN CYAN MAGENTA WHITE PRESS [ENTER] KEY Pressing Enter toggles between tests. To exit to the DISPLAY TEST menu, press Ctrl + Break. 3-16 T4700CS, T4700CT, T4800CT...
  • Page 79 640x480 dot graphics mode 10, 74, 12 as shown below: 640*XXX GRAPHICS DISPLAY EVEN DOTS ODD DOTS ALL DOTS DRIVEN DRIVEN DRIVEN PRESS [Enter] KEY Press Enter to change displayed image size. To exit to the DISPLAY TEST menu, press Ctrl + Break. 3-17 T4700CS, T4700CT, T4800CT...
  • Page 80 HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Pressing Enter displays the following message: Setting the color CRT (1:yes/2:no) If an external CRT is connected to the T4700CS/T4700CT/T4800CT, choose 1 to display the following message: [Border color test (press [Enter] key 7 times)] Press Enter to execute the border color test.
  • Page 81 Status Indicator Panel ALL ON PRESS [ENTER] KEY Subtest 13 WD90C24A Bitblt (4700CS only) This subtest checks the V-RAM transfer command function. It reads and writes a partition of V-RAM data and compares written data to original data. 3-19 T4700CS, T4700CT, T4800CT...
  • Page 82 The fourth indicates the head, and the last two indicate the sector being tested. The first digit in the STATUS number indicates the drive being tested and the last two indicate the error status code as explained in Table 3-3. 3-20 T4700CS, T4700CT, T4800CT...
  • Page 83 01. 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. 3-21 T4700CS, T4700CT, T4800CT...
  • Page 84 = XXXXh Select the channel number (1-3) ? The printer I/O port address is specified by the XXXXh number. The T4700CS/T4700CT/ T4800CT supports three printer channels. Select the appropriate printer channel number, and press Enter to execute a subtest.
  • Page 85 The printer wraparound connector (34M741986G01) wiring diagram is shown in Appendix G. This subtest checks output and bidirectional modes of the data control and status lines through the printer wraparound connector. 3-23 T4700CS, T4700CT, T4800CT...
  • Page 86 NOTE: To execute this subtest, an RS-232C cable (9-pin to 9-pin) must be con- nected to boards 1 and 2. The RS-232C direct cable wiring diagram is shown in Appendix G. This subtest checks the data send/receive function through the RS-232C direct cable. 3-24 T4700CS, T4700CT, T4800CT...
  • Page 87 Select the baud rate and mode for the card modem and press Enter to execute the subtest. Subtest 06 Interrupt Test This subtest checks the Interrupt Request Level of IRQ 4, 3 and 5 from the send side. 3-25 T4700CS, T4700CT, T4800CT...
  • Page 88 CAUTION: The contents of the hard disk will be erased when subtest 02, 03, 04, 05, 06, 08, 09, or 10 is executed. Before running the test, transfer the contents of the hard disk to a floppy disk(s). This can be done with the Toshiba MS-DOS BACKUP command.
  • Page 89 • Forward sequential • Reverse sequential • Random Subtest 03 Random Address/Data This subtest writes random data to random addresses on the HDD cylinder, head, and sector. This data is then read and compared to the original data. 3-27 T4700CS, T4700CT, T4800CT...
  • Page 90 Sequential write This subtest writes specified 2-byte data to all cylinders. Subtest 10 W-R-C specified address This subtest writes data to a specified cylinder and head, then reads the data and compares it to the original data. 3-28 T4700CS, T4700CT, T4800CT...
  • Page 91 Writes 1-bit of “off” data to address FEh through 7Fh Writes the data pattern AAh through 55h to the RTC 50-byte memory (address 0Eh to 3Fh) The subtest then reads and compares this data with original data. To exit, press Ctrl + Break . 3-29 T4700CS, T4700CT, T4800CT...
  • Page 92 Current date : 12-31-1992 Current time : 23:59:58 Pressing Enter displays the following: Current date : 01-01-1993 Current time : 00:00:00 PRESS [Enter] KEY TO EXIT TEST Press Ctrl + Break to exit. 3-30 T4700CS, T4700CT, T4800CT...
  • Page 93 The NDP test contains one subtest that tests the NDP functions. Subtest 01 This test checks the following function of NDP: Control word Status word Addition Multiplication Press Ctrl + Break to exit. 3-31 T4700CS, T4700CT, T4800CT...
  • Page 94 00001 Address line 00001 REG#, CE#1, CE#2 nn=A0, 90, 80, 00 00002 Data line ww=write data, rr=read data 00003 –– –– Speaker line 00004 40, 80 Wait line (40<xx<80) 00005 Other lines (BSY#, BVD1) nn=21, 00 3-32 T4700CS, T4700CT, T4800CT...
  • Page 95 Media Removed DMA Overrun Error DMA Boundary Error CRC Error FDC Error Seek Error FDD Not Drive Error Time Out Error Write Buffer Error Printer Time Out Fault Select Line Out Of Paper Power Off Busy Line 3-33 T4700CS, T4700CT, T4800CT...
  • Page 96 Status Word Error Bus Error Addition Error Multiplication Error PCMCIA Address Line Error REG# Line Error CE#1 Line Error CE#2 Line Error DATA Line Error WAIT Line Error BSY# Line Error BVD1 Line Error No PCMCIA 3-34 T4700CS, T4700CT, T4800CT...
  • Page 97 CORR “0” --- Other (Corrected data) “1” --- Correctable data error was corrected. “0” --- Other (Index) “1” --- Index is sensed. “0” --- Other (Error) “1” --- The previous command was terminated with some error. 3-35 T4700CS, T4700CT, T4800CT...
  • Page 98 “1” Illegal command error or a drive status error occurred. TK00 “0” The hard disk found track 0 during a recalibrate command. (Track 0) “1” The hard disk could not find track 0 during a recalibrate command. —— Not used. 3-36 T4700CS, T4700CT, T4800CT...
  • Page 99 CAUTION: The hard disk will be erased when this program is executed. Before ex- ecuting, transfer hard disk contents onto a backup system. This can be done with the Toshiba MS-DOS BACKUP command. See the Toshiba MS-DOS manual for details on using the BACKUP command.
  • Page 100 CAUTION: The hard disk will be erased when this program is executed. Before executing, transfer the contents of the hard disk onto a backup system. This can be done with the Toshiba MS-DOS BACKUP command. See the Toshiba MS-DOS manual for details on using the BACKUP command.
  • Page 101 Item (f) below. Track Verification A check is made of all tracks, and if an ECC, ECC-correctable, or record- not-found track error is detected, the track is formatted as a bad track . 3-39 T4700CS, T4700CT, T4800CT...
  • Page 102 Press Enter to return to the Hard Disk Format menu. NOTE: After the HDD has been formatted, execute the Toshiba MS-DOS FDISK command to partition the HDD. Next, execute the Toshiba MS-DOS FORMAT com- mand. Refer to the Toshiba MS-DOS manual for more information about using these commands. 3-40...
  • Page 103 Remove the Diagnostics Disk from the FDD, insert the cleaning disk, and press Enter. When the cleaning start message appears, FDD head cleaning has begun. The display returns to the DIAGNOSTIC MENU when the program is completed. 3-41 T4700CS, T4700CT, T4800CT...
  • Page 104 001 FDD 01 0000 180 00001 00 00 FDD - TIME OUT ERROR Address Error status Pass count HDC status Subtest number Read data Test name Write data Error count Error status name [[1:Next,2:Prev,3:Exit,4:Clear,5:Print,6:FD Log Read,7:FD Log Write]] 3-42 T4700CS, T4700CT, T4800CT...
  • Page 105 6 reads log information from a floppy disk. 7 writes log information to a floppy disk. In the case of “error retry OK,” a capital “R” will be placed at the beginning of the error status, but not added to the error count. 3-43 T4700CS, T4700CT, T4800CT...
  • Page 106 Printer wrap around test (Y/N) ? Select Y (yes) to execute the printer wraparound test. A printer wraparound connector must be connected to the PRT/FDD port on the back of the T4700CS/ T4700CT/T4800CT to execute this test. Select Y or N and press Enter. The following message will appear: Serial #A wrap around test (Y/N) ? Select Y (yes) to execute the ASYNC wraparound test.
  • Page 107 Select Yes or No and press Enter to display the following message: Mount the work disk(s) on the drive(s), then press [Enter] key. [Warning] : The contents of the disk(s), will be destroyed.] This program is executed continuously. To terminate the program, press Ctrl + Break. 3-45 T4700CS, T4700CT, T4800CT...
  • Page 108 FDD and HDD. FORMAT NOTE: This program is only for testing a floppy disk drive. The option is different from the Toshiba MS-DOS FORMAT command. This program can format a 5.25-inch or 3.5-inch floppy disk in the following formats: 2D: Double-sided, double-density, 48/67.5 TPI, MFM mode, 512 bytes, 9 sectors/track.
  • Page 109 FLOPPY DISK FORMAT & COPY : VX.XX Type select (0:2DD-2DD,1:2D-2D,2:2D-2HD,3:2HD-2HD) ? Select a media/drive type number to display a message similar to the one below: Insert source disk into drive A: Press any key when ready. 3-47 T4700CS, T4700CT, T4800CT...
  • Page 110 Insert a source disk and press any key and the following message will appear: —— Max. address —— [Track ] = 0079 [ Head ] = 01 [Sector] = 09 Track number ?? Set a track number to dump. The system will access the disk and dump a list. 3-48 T4700CS, T4700CT, T4800CT...
  • Page 111 * - 1 HARD DISK DRIVE(S) * - 1 PRINTER ADAPTER * - XXXXXKB EXTENDED MEMORY * - PS MICOM VERSION = VX.XX * - XXXXX BATTERY Press [Enter] Key Press Enter to return to the DIAGNOSTIC MENU. 3-49 T4700CS, T4700CT, T4800CT...
  • Page 112 Power on Password Others (a) Power-up Mode (b) CPU Cache (c) Speaker Volume (d) Panel Power On/Off (e) Alarm Power On (f) Hotkey (g) Boot Priority (h) Sound I/O Address (i) Ext. Keyboard “Fn” key equivalent 3-50 T4700CS, T4700CT, T4800CT...
  • Page 113 Select items, Space, BkSp : Change values Esc: Exit without saving, Home: Set default values, End: Save changes and Exit NOTE: LCD display colors do not appear on the T4700CS screen. Moving Within the SETUP Menu and Changing Values Press ← and → to move between columns. Press ↑ and ↓ to move between items in a column.
  • Page 114 This field displays the amount of extended memory available. These values may not be changed by the user. Shadow BIOS ROM The SETUP program displays 128 KB of RAM reserved for Shadow BIOS ROM. These values may not be changed by the user. 3-52 T4700CS, T4700CT, T4800CT...
  • Page 115 The system starts up by using the internal display if no external display is attached, or by using the external display if an external display is attached. Simultaneous The system starts up by using both the internal and external displays. 3-53 T4700CS, T4700CT, T4800CT...
  • Page 116 Note: Use of of the Fn+F5 hotkey for display selection has different effects on the T4700CS and T4700CT/T4800CT. For the T4700CS, the effect of the Fn+F5 hotkey depends on the Power on display setting, as follows: (a) Simultaneous:Toggles between Internal and Simultaneous (SVGA is not supported).
  • Page 117 Activates bi-directional operation. Hard Disk This option enables or disables the HDD. XX MB The 200-MB (T4700CS/T4700CT), 320-MB or 500-MB (T4800 CT) type HDD can be used. Disk capacity is displayed automatically and cannot be changed. No Drive The hard disk cannot be accessed.
  • Page 118 Economy Power, or Low Power) is disabled and the user-preferred parameters become effective. The default setting in the sub-windows depends on the Battery Save Mode: Full Power, Economy Power, or Low Power. User settings let you select the follow ing options: 3-56 T4700CS, T4700CT, T4800CT...
  • Page 119 This option is used to set the CPU operating speed to high or low. Processing Speed CPU Speed High 50 MHz [T4700CS/T4700CT] 75 MHz [T4800CT] 25 MHz (Equivalent) [T4700CS/T4700CT] 37.5 MHz (Equivalent) [T4800CT] CPU Sleep Mode Use this option to enable or disable the CPU sleep function. Enabled Enables sleep mode.
  • Page 120 (b) Battery display This option selects the way the status indicator panel indicates remaining battery capacity when the T4700CS/T4700CT/T4800CT is not connected to the AC adapter. The options are Time and % Remaining. The status indicator panel indicates how much battery power is left. If you se- lect Time the status indicator panel indicates an estimated time for which the T4700CS/T4700CT/T4800CT can operate with the remaining battery power.
  • Page 121 Selects the minimum speaker volume. Medium Selects the medium speaker volume. High Sets the maximum speaker volume. If you select this option, a sub-window, SPEAKER VOLUME OPTIONS, appears and you can set additional options for the speaker volume . 3-59 T4700CS, T4700CT, T4800CT...
  • Page 122 Disabled Alarm power on feature is disabled. hh:mm:ss Alarm power on feature is enabled . If you enable this option, the T4700CS/T4700CT/T4800CT will be powered on and boot up, or resume automatically at the time you set here. 3-60 T4700CS, T4700CT, T4800CT...
  • Page 123 HDD → FDD HDD → FDD A → FDD B NOTE: If you turn the T4700CS/T4700CT/T4800CT on while press- ing the F10 key, it attempts to load the operating system in the reverse order that you set by using this option. The option setting is not affected by pressing the F10 key.
  • Page 124 Left Alt + Left Shift functions as Fn key. Right Alt + Right Shift Right Alt + Right Shift functions as Fnkey. Left Alt + Caps Lock Left Alt + Caps Lock functions as Fn key. 3-62 T4700CS, T4700CT, T4800CT...
  • Page 125 General This section explains how to disassemble the T4700CS/T4700CT/T4800CT and replace Field Replaceable Units (FRUs). It may not be necessary to remove all the FRUs in order to re- place one. The chart below is a guide to which FRUs need to be removed in order to remove others.
  • Page 126 After removing parts from the computer, place them in a safe place away from the computer so they will not be damaged and will not interfere with your work. You will remove and replace many screws when you disassemble the T4700CS/ T4700CT/T4800CT. When you remove screws, make sure they are placed in a safe place and identified with the correct parts.
  • Page 127 FRU. After installing an FRU in the T4700CS/T4700CT/T4800CT confirm that the FRU and the T4700CS/T4700CT/T4800CT are functioning properly.
  • Page 128 Installing the Battery Pack NOTE: The battery pack is designed to fit into the T4700CS/T4700CT/T4800CT in only one way. Notice that the battery packs for the T4700CS/T4700CT and T4800CT are different. To install the T4700CS/T4700CT/T4800CT battery pack, follow the steps below and refer to...
  • Page 129 Optional Memory Card Removing an Optional Memory Card To remove an optional memory card from the T4700CS/T4700CT/T4800CT, follow the steps below and refer to figures 4-2 and 4-3. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 130 Installing an Optional Memory Card To install an optional memory card in the T4700CS/T4700CT/T4800CT, follow the steps below and refer to figures 4-2 and 4-3. The top of the optional memory card is marked with the word “insert” and an arrow pointing toward the connecting edge.
  • Page 131 Optional PCMCIA Card Removing an Optional PCMCIA Card The T4700CS/T4700CT/T4800CT has two PCMCIA slots: one for a card up to 5.0 mm (slot 2) and one for a card up to 16 mm (slot 1). To remove optional PCMCIA cards, follow the steps below and refer to figures 4-4 through 4-6: Turn off the power to the T4700CS/T4700CT/T4800CT.
  • Page 132 Figure 4-6 Removing the card from the PCMCIA card slot 1 Installing an Optional PCMCIA Card To install the optional PCMCIA cards in the T4700CS/T4700CT/T4800CT, follow the steps below and refer to figures 4-4 through 4-6: To install a PCMCIA card into PCMCIA card slot 2, carefully insert the card, making sure the card is right side up and the contact surface is inserted first (figure 4-4).
  • Page 133 Hard Disk Drive Removing the Hard Disk Drive To remove the T4700CS/T4700CT/T4800CT’s hard disk drive, follow the steps below and refer to figures 4-7 through 4-10. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 134 Remove the VOID seal, and remove the four flat screws securing the cover to the pack, slide the cover forward slightly (about 2 cm) and lift off the cover (figure 4- Figure 4-9 Removing the cover 4-10 T4700CS, T4700CT, T4800CT...
  • Page 135 Figure 4-10 Removing the HDD Installing the HDD To install the T4700CS/T4700CT/T4800CT’s HDD follow the steps below and refer to figures 4-7 through 4-10. Connect the HDD connector to the HDD. Fit a slot on the bottom of the connec- tor onto a tongue on the case and seat the HDD into the case (figure 4-10).
  • Page 136 Top Cover Removing the Top Cover To remove the T4700CS/T4700CT/T4800CT’s top cover, follow the steps below and refer to figures 4-11 to 4-13. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 137 (figure 4- 13). 7. Continue around the rim of the top cover until all latches are released, then carefully lift off the top cover (figure 4-13). Figure 4-13 Unlatching the top cover 4-13 T4700CS, T4700CT, T4800CT...
  • Page 138 Installing the Top Cover To install the T4700CS/T4700CT/T4800CT’s top cover, follow the steps below and refer to figures 4-11 through 4-13. Place the top cover on the T4700CS/T4700CT/T4800CT. Begin at the back and snap the top cover into place, continuing along the sides and finally the front until all 14 latches are snapped (figure 4-13).
  • Page 139 Keyboard Removing the Keyboard To remove the T4700CS/T4700CT/T4800CT’s keyboard, follow the steps below and refer to figure 4-14. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 140 Installing the Keyboard To install the T4700CS/T4700CT/T4800CT’s keyboard, follow the steps below and refer to figures 4-14 and 4-15. Connect the keyboard cable to pressure plate connector (PJ8) on the upper system board (figure 4-14). Seat the keyboard in the T4700CS/T4700CT/T4800CT. Note that a fold is build into the keyboard cable.
  • Page 141 Status Indicator Panel Removing the Status Indicator Panel To remove the T4700CS/T4700CT/T4800CT’s status indicator panel, follow the steps below and refer to figure 4-16. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 142 Installing the Status Indicator Panel To install the T4700CS/T4700CT/T4800CT’s status indicator panel, follow the steps below and refer to figures 4-16. Connect the status indicator panel cable to pressure plate connector (PJ6) on the upper system board (figure 4-16). Set the status indicator panel in the upper system board cover, making sure it is seated securely in its brackets.
  • Page 143 4-9 through 4-12. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT. Remove the battery pack, optional memory card, optional PCMCIA card,, HDD pack, and top cover as described in sections 4.2, 4.3, 4.4, 4.5, and 4.6.
  • Page 144 Installing the Backup Battery and Microphone To install the T4700CS/T4700CT/T4800CT’s backup battery and microphone, follow the steps below and refer to figures 4-18 and 4-20. Fit the two notches on the microphone onto two prongs on the computer (figure 4-18).
  • Page 145 Lay the backup battery and cables in place on the computer and secure them with tape (figure 4-20). Install the top cover, HDD pack, optional PCMCIA card, optional memory card and battery pack as described in sections 4.6, 4.5, 4.4, 4.3 and 4.2. 4-21 T4700CS, T4700CT, T4800CT...
  • Page 146 4.10 Display Assembly Removing the Display Assembly To remove the T4700CS/T4700CT/T4800CT’s display assembly, follow the steps below and refer to figures 4-21 through 4-24. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 147 Figure 4-22 Removing the display , FL and ground cable Turn the computer around and remove the two M2.5x6 silver screws on the back of the computer securing the display assembly (figure 4-23). Figure 4-23 Removing the screws (back of computer) securing the display assembly 4-23 T4700CS, T4700CT, T4800CT...
  • Page 148 Remove the screws at the corners first then remove the screw securing the hinge brace at the right side of the computer (figure 4-24). Figure 4-24 Removing the display assembly If you are going to disassemble the display assembly, go to section 4.16. 4-24 T4700CS, T4700CT, T4800CT...
  • Page 149 Installing the Display Assembly To install the T4700CS/T4700CT/T4800CT’s display assembly, follow the steps below and refer to figures 4-21 through 4-24. Place the display assembly on the computer making sure the brackets on the display fit in front of the corresponding brackets on the computer.
  • Page 150 4.11 Upper System Board, Power Supply Board Removing the Upper System Board and Power Supply Board To remove the T4700CS/T4700CT/T4800CT’s upper system board and power supply board, follow the steps below and refer to figures 4-25 through 4-27. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 151 Figure 4-26 Removing the upper system board Turn the upper system board upside down, and remove the power supply board (figure 4-27). Figure 4-27 Removing the power supply board 4 - 2 7 T4700CS, T4700CT, T4800CT...
  • Page 152 Installing the Upper System Board and Power Supply Board To install the T4700CS/T4700CT/T4800CT’s upper system board and power supply board, follow the steps below and refer to figures 4-25 through 4-27. Connect the power supply board to the upper system board (figure 4-27).
  • Page 153 4.12 Base Assembly, Power/Reset Board Removing the Base Assembly To remove the T4700CS/T4700CT/T4800CT’s base assembly, follow the steps below and refer to figures 4-28 and 4-31. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 154 Stand the T4700CS/T4700CT/T4800CT on its back side and grasp the computer with your hand covering the base assembly. While holding the computer with one hand to steady it and to protect the base assembly, remove two M2.5x6 silver screws and one M2.5x12 silver screw on the bottom of the computer (figure 4- 29).
  • Page 155 Disconnect the power/reset cable from the power/reset board (figure 4-31). Figure 4-31 Removing the power/reset cable 4 - 3 1 T4700CS, T4700CT, T4800CT...
  • Page 156 Installing the Base Assembly To install the T4700CS/T4700CT/T4800CT’s base assembly and power/reset board, follow the steps below and refer to figures 4-28 through 4-32. Connect the power/reset cable to the power/reset board (figure 4-31). Seat the power/reset board inside its brackets on the bottom cover, then fold the power/reset cable down into the slot in front of the system board.
  • Page 157 4.13 Floppy Disk Drive Removing the Floppy Disk Drive To remove the T4700CS/T4700CT/T4800CT’s floppy disk drive, follow the steps below and refer to figures 4-33 through 4-35. Turn off the power to the T4700CS/T4700CT/T4800CT. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 158 BPQP port (figure 4-34). Figure 4-34 Removing BPQP port screws Remove the four M2x4 screws, securing the FDD and lift the base assembly off the FDD (figure 4-35). Figure 4-35 Removing the FDD 4 - 3 4 T4700CS, T4700CT, T4800CT...
  • Page 159 Installing the Floppy Disk Drive To install the T4700CS/T4700CT/T4800CT’s floppy disk drive, follow the steps below and refer to figures 4-33 through 4-35. Place the FDD in the base assembly and, holding the FDD with your hand so it doesn’t fall out, turn the base assembly over.
  • Page 160 4.14 Speaker, RTC Battery, BPQP Port Removing the Speaker, RTC Battery, BPQP Port To remove the T4700CS/T4700CT/T4800CT’s speaker, RTC battery and BPQP port, follow the steps below and refer to figures 4-36 through 4-38. Turn off the power to the T4700CS/T4700CT/T4800CT and disconnect the AC adapter, power cord, and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 161 Disconnect the speaker, RTC battery, and BPQP port cable from the each connector of the PCMCIA slot 2 connector board (figure 4-38). Figure 4-38 Disconnecting the speaker, RTC battery, and BPQP port cable 4 - 3 7 T4700CS, T4700CT, T4800CT...
  • Page 162 Installing the Speaker, RTC Battery, BPQP port To install the T4700CS/T4700CT/T4800CT’s speaker, RTC battery, and BPQP port, follow the steps below and refer to figures 4-36 through 4-38. Connect the speaker, RTC battery, and BPQP port cable to PCMCIA slot 1 board (figure 4-38).
  • Page 163 4.15 Lower System Board Removing the Lower System Board To remove the T4700CS/T4700CT/T4800CT’s lower system board, follow the steps below and refer to figures 4-39 through 4-41. Turn off the power to the T4700CS/T4700CT/T4800CT and disconnect the AC adapter, power cord, and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 164 (figure 4-40). Figure 4-40 Removing the lower system board Disconnect the sound system board from lower system board (figure 4-41). Figure 4-41 Removing the sound system board 4 - 4 0 T4700CS, T4700CT, T4800CT...
  • Page 165 Installing the Lower System Board To install the T4700CS/T4700CT/T4800CT’s lower system board, follow the steps below and refer to figure 4-39 through 4-41. Connect the sound system board to lower system board, then place the lower system board on the base assembly frame (figure 4-41).
  • Page 166 4.16 Display Mask Removing the Display Mask To remove the T4700CS/T4700CT/T4800CT’s display mask, follow the steps below and refer to figure 4-42. Turn off the power to the T4700CS/T4700CT/T4800CT and disconnect the AC adapter, power cord, and all external cables connected to the T4700CS/T4700CT/ T4800CT.
  • Page 167 Secure the cover with two M2.5x6 screws at the top corners (figure 4-42). Attach the two rubber cushions at each top corner to cover the screws (figure 4- 42). Install the top cover and battery pack as described in sections 4.6 and 4.2. 4 - 4 3 T4700CS, T4700CT, T4800CT...
  • Page 168 4.17 T4700CS FL Inverter Board Removing the T4700CS FL Inverter Board To remove the T4700CS’s FL inverter board, follow the steps below and refer to figure 4-43. Turn off the power to the T4700CS. Disconnect the AC adapter, and all external cables connected to the T4700CS.
  • Page 169 Installing the T4700CS FL Inverter Board To install the T4700CS’s FL inverter board, follow the steps below and refer to figure 4-43. Connect the FL inverter cable to CN1 on the inverter board and the FL cables to CN2 (figure 4-43).
  • Page 170 4.18 T4700CS LCD Module Removing the Color LCD Module To remove the T4700CS’s color LCD module, follow the steps below and refer to figure 4- Turn off the power to the T4700CS. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS.
  • Page 171 Installing the T4700CS LCD Module To install the T4700CS’s LCD module, follow the steps below and refer to figure 4-44. Connect the three display cables to the LCD module, and carefully rotate the LCD module to the LCD cover. Secure the four M2.5x6 screws on the LCD module.
  • Page 172 Removing the T4700CS FL To remove the T4700CS’s FL, follow the steps below. Refer to figures 4-45 through 4-47. Turn off the power to the T4700CS. Disconnect the AC adapter, and all external cables connected to the T4700CS.
  • Page 173 Remove the four M2x3 screws securing the FL unit and FL unit cover to the back frame (figure 4-46). Figure 4-46 Removing the FL screws (T4700CS) Lift up the reflective sheet covering the LCD module. Lift out the FL (figure 4-47).
  • Page 174 Installing the T4700CS FL Unit To install the T4700CS’s FL unit, follow the steps below and refer to figures 4-45 through 4- Place the FL on the FL unit and cover the FL using a reflective sheet (figure 4- 47).
  • Page 175 4.20 T4700CS FL Inverter Cable, Display Cable Removing the FL Inverter Cable, Display Cable To remove the T4700CS’s FL inverter cable, display cable, follow the steps below and refer to figures 4-48 and 4-49. Turn off the power to the T4700CS. Disconnect the AC adapter, power cord and all external cables connected to the T4700CS.
  • Page 176 Figure 4-49 Removing the display cables (T4700CS) Installing the FL Inverter Cable, Display Cable To install the T4700CS’s FL inverter cable, display cable, follow the steps below and refer to figures 4-48 and 4-49. Fit the display cable to the display cover and secure the display hinge with two M2.5x6 screws.
  • Page 177 LCD cover (figure 4-50). Remove the tape, securing the FL inverter cable, and disconnect the FL cable from CN2 . Then turn over the LCD module (figure 4-50). Figure 4-50 Removing the six screws and connectors (T4700CT/T4800CT) 4-53 T4700CS, T4700CT, T4800CT...
  • Page 178 Align the LCD module and then secure it with two M2.5x6 screws, and secure the four M2.5x10 screws (figure 4-50). Install the battery pack, top cover and display mask as described in sections 4.2, 4.6 and 4.16. 4-54 T4700CS, T4700CT, T4800CT...
  • Page 179 Replace the FL unit in the frame and secure it with the four M2x6 silver screws (figure 4-52). Install the TFT color LCD module, the display mask, top cover, and the battery pack as described in sections 4.2, 4.6, 4.16, and 4.21. 4-55 T4700CS, T4700CT, T4800CT...
  • Page 180 Replace the FL inverter board and secure it with the two M2¥5 screws (figure 4- 53). Install the TFT color LCD module, display mask, top cover and battery pack as described in sections 4.2, 4.6, 4.16, and 4.21. 4-56 T4700CS, T4700CT, T4800CT...
  • Page 181 FL inverter cable from CN1 of the FL inverter board (figure 4-54). Disconnect the FL inverter cable from PJ2 from upper system board (figure 4- 54). Figure 4-54 Removing the FL inverter signal cable (T4700CT/T4800CT) 4-57 T4700CS, T4700CT, T4800CT...
  • Page 182 (figure 4-54). Install the TFT color LCD module, display mask, display assembly, top cover, and battery pack as described in sections 4.2, 4.6, 4.10, 4.16, and 4.21. 4-58 T4700CS, T4700CT, T4800CT...
  • Page 183 Figure 4-56 Removing the panel close switch Installing the Panel Close Switch To install the T4700CS/T4700CT/T4800CT’s panel close switch, follow the steps below and refer to figure 4-56. Fit the panel close switch to display hinge and secure the panel close switch with one M2x8 screw (figure 4-56).
  • Page 184 4-60 T4700CS, T4700CT, T4800CT...
  • Page 185 Appendix A Handling the LCD Module Precautions for handling the T4700CS/T4700CT/T4800CT LCD module The T4700CS/T4700CT/T4800CT’s LCD module can be easily damaged during assembly or disassembly. Observe the following precautions when handling the LCD module: 1.When installing the LCD module in the LCD cover, be sure to seat it so that it is properly aligned and maximum visibility of the display is maintained.
  • Page 186 If the panel’s surface gets dirty, wipe it with cotton or a soft cloth. If it is still dirty, try breathing on the surface to create a light condensate and wipe it again. If the surface is very dirty, we recommend Ligroin as a cleaning agent. Apply the agent to a cloth and then wipe the panel’s surface.
  • Page 187 CMOS-LSI circuits are used in the module, so guard against damage from electro- static discharge. Be sure to wear a wrist or ankle ground when handling the module. Do not expose the module to direct sunlight or strong ultraviolet rays for long periods.
  • Page 188 Do not disassemble the LCD module. Disassembly can cause malfunctions. If you transport the module, do not use packing material that contains epoxy resin (amine) or silicon glue (alcohol or oxime). These materials can release gas that can damage the panels’ polarization. App-4...
  • Page 189 Appendix B Board Layout T4700CS/T4700CT Upper System Board (FSXSY4) Figure B-1 Upper system board FSXSY4 (front) App-5...
  • Page 190 Figure B-2 Upper system board FSXSY4 (back) App-6...
  • Page 191 T4800CT Upper System Board (FX3SY1) Figure B-3 Upper system board FX3SY1 (front) App-7...
  • Page 192 Figure B-4 Upper system board FX3SY1 (back) App-8...
  • Page 193 Table B-1 Upper ICs and connectors on the system board (front) Mark Number Name Clock generator CPU 486DX2 (FSXSY4) CPU 486DX4 (FX3SY1) System controller gate array IC21, 22 Video RAM IC29 IC33 PJ15 Microphone connector FL inverter connector PJ13 Backup battery connector Status indicator panel connector Display connector Panel close switch connector...
  • Page 194 Lower System Board (FSXIO2) Figure B-5 Lower system board FSXIO2 (front) App-10...
  • Page 195 Figure B-6 Lower system board FSXIO2 (back App-11...
  • Page 196 Table B-3 Lower ICs and connectors on the system board (front) Mark Number Name PJ301 Joint connector 1 PJ302 Joint connector 2 PJ303 PRT/FDD connector PJ304 Internal FDD connector PJ305 HDD connector PJ306 Serial connector PJ307 150-pin expansion connector PJ308 PCMCIA slot 1 connector PJ311 External display connector...
  • Page 197 Appendix C Pin Assignment PJ1 Memory Slot Connector (88-Pin) Table C-1 Memory slot connector pin assignment (88-pin) Signal Signal — — D00;100 D16;100 D01;100 D17;100 D02;100 D18;100 D03;100 D19;100 D04;100 D20;100 D05;100 D21;100 D06;100 D22;100 — D23;100 D07;100 — — RAS2;001 —...
  • Page 198 App-14...
  • Page 199 PJ2 FL Inverter Connector (6-Pin) Table C-2 FL inverter connector pin assignment (6-pin) Signal Signal DSPV — DSPV BRTCNT;100 — — PJ3 LCD Connector (40-Pin) Table C-3 LCD connector pin assignment (40-pin) Signal Signal LCDVCC — STND3;103 LCDVCC — FR;103 PNEL1;100 STND0;103 —...
  • Page 200 PJ5 Panel Close Switch Connector (2-Pin) Table C-4 Panel close switch connector pin assignment (2-pin) Signal Signal PNLOFF;000 — PJ6 Status Indicator Panel Connector (16-Pin) Table C-5 Status indicator panel I/F pin assignment (16-pin) Signal Signal LCOM4;100 LSEG08;110 LCOM3;100 LSEG07;110 LCOM2;100 LSEG06;110 LCOM1;100...
  • Page 201 PJ11 (PJ301) Joint Connector 1 (100-Pin) Table C-7 Joint connector 1 pin assignment (100-pin) Signal Signal SD07;100 TMOUT2;100 SD08;100 TIMGT2;100 SD06;100 TMOUT1;100 SD09;100 MEWR;000 SD05;100 KBCS;000 SD10;100 MERD;000 SD04;100 HREQ;100 SD11;100 RSTCPU;100 — DMEN16;100 — PCLR;001 SD03;100 HLDACK;100 SD12;100 ROMCS;000 SD02;100 DMACLK;100 SD13;100...
  • Page 202 PJ12 (PJ302) Joint Connector 2 (60-Pin) Table C-8 Joint connector 2 pin assignment (60-pin) Signal Signal DCIN — ADPCNT;100 IRQ12;100 DCIN REFRSH;000 CPCNF;100 DACK6;000 DCIN IHMED;000 SMEW;000 DACK7;000 DCIN KBRW0;000 SMER;000 DACK4;000 AGNDIM KBTMG;100 BEEP;000 MASTER;000 KBOT00;000 M12V KEYPRS;100 IMICIN;100 KBOT01;000 —...
  • Page 203 PJ13 Backup Battery Connector (2-Pin) Table C-9 Backup battery connector pin assignment (2-pin) Signal Signal SUBBAT — — C.10 PJ14 PS I/F Connector (60-Pin) Table C-10-1 PS IF connector pin assignment (60-pin) [T4700CS/T4700CT] Signal Signal M12V SUBBAT — SPKVOL;100 PSTMG;000 DCIN BRTCNT;100...
  • Page 204 Table C-10-2 PS IF connector pin assignment (60-pin) [T4800CT] Signal Signal PWRSW;000 ENB3V;000 PSRST;000 RSTSW;000 EN3V;000 PSUPDT;100 — PNLOF;000 ENVCC;000 SUSSTA;001 — PSAD7;100 CPCNF;100 PSREQ;000 — — BEEP;000 — DSPV PSAD6;100 PCLR;000 — DSPV PSAD5;100 LOBAT;100 — PSAD4;100 SRBTN;000 — PSAD3;100 —...
  • Page 205 C.11 PJ15 Microphone Connector (3-Pin) Table C-11 Microphone connector pin assignment (3-pin) Signal Signal IMICIN;100 N.C. — AGNDIM C.12 PJ17 Power/Reset Switch Connector (3-Pin) Table C-12 Power/Reset switch connector pin assignment (3-pin) Signal Signal RSTSW;010 PWRSW;010 — C.13 PJ303 PRT/FDD Connector (for Printer) (25-Pin) Table C-13 PRT/FDD connector (for printer) pin assignment (25-pin) Signal Signal...
  • Page 206 C.14 PJ303 PRT/FDD Connector (for FDD) (25-Pin) Table C-14 PRT/FDD connector (for FDD) pin assignment (25-pin) Signal Signal LOWD INDX SSEL DIRC STEP RDAT — DKCH — — — — — — — — — WDAT — C.15 PJ304 FDD (Int) Connector (26-Pin) Table C-15 FDD (Int) connector pin assignment (26-pin) Signal Signal...
  • Page 207 C.16 PJ305 HDD I/F Connector (60-Pin) Table C-16 HDD I/F connector pin assignment (60-pin) Signal Signal SD07;102 — RESET;000 — SD08;102 IORD;000 — IOWR;000 SD06;102 — SD09;102 — — IIO16 — IIRDY SD05;102 — SD10;102 — — SA01;100 — IRQ14;100 SD04;102 —...
  • Page 208 C.17 PJ306 Serial I/F Connector (9-Pin) Table C-17 Serial I/F connector pin assignment (9-pin) Signal Signal DCD1;101 DSR1;101 RD1;001 RTS1;101 SD1;001 CTS1;101 DTR1;101 RI1;101 — App-24...
  • Page 209 C.18 PJ307 Expansion Connector (150-Pin) Table C-18 Expansion connector pin assignment (150-pin) (1/2) Signal Signal DCIN SA11;101 DCIN SA12;101 DCIN SA13;101 DCIN SA14;101 N/C (DSKCUR) SA15;101 N/C (DSKCUR) — N/C (DSKCUR) SA16;101 N/C (DSKCUR) SA17;101 ADPCNT;100 SA18;101 — SA19;101 RVCC —...
  • Page 210 Table C-18 Expansion connector pin assignment (150-pin) (2/2) Signal Signal — IRQ4;101 IOCLK;110 MEWR;001 IRQ5;101 IRQ7;101 DRQ3;101 — DACK3;001 RED;101 AEN;101 LGREN;101 DRQ1;101 BLUE;101 EIORDY;101 — — PHSYNC;100 IRQ10;101 PVSYNC;100 IRQ14;101 — SD08;101 EKBDAT;100 SD09;101 EKBCLK;100 IRQ11;101 — SD10;101 MOUSDT;100 SD11;101 MOUSCK;100 SD12;101...
  • Page 211 C.19 PJ308 PCMCIA Slot 1 Connector (68-Pin) Table C-19 PCMCIA slot 1 connector pin assignment (68-pin) Signal Signal — — CDA03;100 CD1A;000 CDA04;100 CDA11;100 CDA05;100 CDA12;100 CDA06;100 CDA13;100 CDA07;100 CDA14;100 CE1A;000 CDA15;100 CADA10;100 CE2A;000 OEA;000 — CADA11;100 IORA;000 CADA09;100 IOWA;000 CADA08;100 CADA17;100 CADA13;100...
  • Page 212 C.20 PJ309 PCMCIA Slot 2 Joint Connector 1 (40-Pin) Table C-20 PCMCIA slot 2 joint connector 1 pin assignment (40-pin) Signal Signal CADB22;100 CADB03;100 MCVP2B — REGB;000 CADB16;100 CADB02;100 MCVP1B — BVDB2;100 CADB15;100 CADB01;100 CADB23;100 BVDB1;100 CADB12;100 CADB00;100 CADB24;100 CDB08;100 —...
  • Page 213 C.21 PJ310 PCMCIA Slot 2 Joint Connector 2 (40-Pin) Table C-21 PCMCIA slot 2 joint connector 2 pin assignment (40-pin) Signal Signal — — MOUSCK;100 — MOUSDT;100 OEB;000 CDB11;100 CADB11;100 CD1B;000 IOWB;000 CDB04;100 CADB09;100 CDB03;100 CADB17;100 CDB05;100 CADB08;100 CDB12;100 CADB18;100 CDB06;100 CADB13;100 —...
  • Page 214 C.23 PJ312 PS/2 Mouse Connector (6-Pin) Table C-23 PS/2 mouse connector pin assignment (6-pin) Signal Signal MOUSDT;101 — — MOUSCK;101 — — C.24 PJ313 PS/2 Keyboard I/F Connector (6-Pin) Table C-24 PS/2 keyboard I/F connector pin assignment (6-pin) Signal Signal EKBDAT;101 —...
  • Page 215 Appendix D USA Display Codes Table D-1 USA Display Codes App-31...
  • Page 216 Appendix E Keyboard Scan/Character Codes Table E-1 Scan codes (set 1 and set 2) (1/3) Code set 1 Code set 2 Keytop Make Break Make Break Note ‘ ~ 7 & BkSp 29 (42) Caps Lock App-33...
  • Page 217 Table E-1 Scan codes (set 1 and set 2) (2/3) Code set 1 Code set 2 Keytop Make Break Make Break Note ‘ “ Enter Shift (L) No.102 key , < . > Shift (R) Ctrl Alt (L) Space ALT (R) E0 F0 11 E0 F0 70 E0 F0 71...
  • Page 218 Table E-1 Scan codes (set 1 and set 2) (3/3) Code set 1 Code set 2 Keytop Make Break Make Break Note PrintSc Pause — — — — Notes: 1* Scan codes differ by mode. 2* Scan codes differ by overlay function. 3* Combination with Fn key makes different codes.
  • Page 219 Table E-2 Scan codes with left Shift key Code set 1 Code set 2 Make Break Make Break E0 AA E0 52 E0 D2 E0 2A E0 F0 12 E0 70 E0 F0 70 E0 12 E0 AA E0 53 E0 D3 E0 2A E0 F0 12 E0 71 E0 F0 71 E0 12...
  • Page 220 Table E-4 Scan codes with Fn key Code set 1 Code set 2 Keytop Make Break Make Break CTRL LALT NUML SCRL Table E-5 Scan codes in overlay mode Code set 1 Code set 2 Keytop Make Break Make Break (–) Table E-6 Scan codes with Ctrl key Code set 1...
  • Page 221 Table E-7 Scan codes with Alt key Code set 1 Code set 2 Shift Make Make Pause Common SD C5 F0 77 Ctrl* *: This key generates only make codes. App-38...
  • Page 222 Appendix F Key Layout The arrow key markings for the T4700CS and T4700CT/T4800CT are different. The T4700CS keyboard has contrast icons on the left and right arrow keys. The T4700CT/ T4800CT keyboard has no contrast control function. United States (US) Keyboard...
  • Page 223 German (GR) Keyboard Figure F-3 GR Keyboard French (FR) Keyboard Figure F-4 FR Keyboard App-40...
  • Page 224 Spanish (SP) Keyboard Figure F-5 SP Keyboard Italian (IT) Keyboard Figure F-6 IT Keyboard App-41...
  • Page 225 Scandinavian (SC) Keyboard Figure F-7 SC Keyboard Swiss-German (SL) Keyboard Figure F-8 SL Keyboard App-42...
  • Page 226 Canadian (Specialized) Keyboard Figure F-9 Canadian Keyboard F.10 Keycap Number Keyboard Figure F-10 Keycap Number Keyboard App-43...
  • Page 227 Appendix G Wiring Diagrams Printer Wraparound Connector (9) +PD7 (15) –ERROR (8) +PD6 (14) –AUTFD (7) +PD5 (13) +SELECT (6) +PD4 (16) –PINIT (5) +PD3 –STROBE (10) –ACK (4) +PD2 (12) (3) +PD1 (17) –SLIN (2) +PD0 (11) +BUSY Figure G-1 Printer Wraparound Connector RS-232C Wraparound Connector (3) TD (7) RTS...
  • Page 228 RS-232C Direct Cable (9-Pin to 25-Pin) (1) CD (2) RD (3) TD (4) DTR (22) (5) GND (7) RTS (6) DSR (20) (8) CTS (9) RI Figure G-4 RS-232C Direct Cable (9-pin to 25-pin) App-46...
  • Page 229 For security reasons, the Password Deletion Disk will not be distributed to Service Providers. You must obtain the current password from the computer's owner to service the machine. If the owner forgets the password, contact your Toshiba representative for further action. App-47...
  • Page 230 BIOS rewriting disk for T4700CS/T4700CT/T4800CT Rewriting the BIOS Set the system to Boot Mode. Turn off power to the T4700CS/T4700CT/T4800CT. Remove the external cable and PCMCIA card. Turn on the power while holding down the F12 key. (Keep holding down the key until the system speaker sounds a beep.)
  • Page 231 App-50...

This manual is also suitable for:

T4700ctT4800ct