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T4900CT

4-39

4.15 Lower System Board

Removing the Lower System Board

To remove the T4900CT’s lower system board, follow the steps below and refer to figures 4-
36 through 4-38.

1.

Turn off the power to the T4900CT and disconnect the AC adapter, power cord,
and all external cables connected to the T4900CT.

2.

Remove the battery pack, optional memory card, optional PCMCIA card, HDD
pack, top cover, keyboard, status indicator panel, backup battery and microphone,
display assembly, upper system board, power supply board, base assembly, and
PCMCIA slot 2 board as described in sections 4.2 through 4.12, and 4.14.

3.

Disconnect the

FDD cable

from

PJ304

of the lower system board, if not discon-

nected earlier.

4.

Remove

three M2.5x6 screws

securing the

lower system board’s metal cover

,

then lift it off (figure 4-36). Be careful to clear

two audio ports

projecting slightly

through holes in the cover.

Figure 4-36 Removing the lower system board’s metal cover

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Summary of Contents for T-Series T4900CT

Page 1: ...e Disk storage The T4900CT has an internal 2 5 inch 810 MB HDD A 3 5 inch FDD supports 2 HD 1 44 MB floppy disks and 2DD 720 KB floppy disks Memory The T4900CT comes standard with 8 MB of CMOS type Dynamic Random Access Memory DRAM 3 3 Volts This includes 640 KB of conventional memory and 7 360 KB of extended memory which can be utilized as expanded memory compatible with the Lotus Intel Microsoft...

Page 2: ...CT has two PCMCIA slots which enable you to install a MiNC Toshiba card modem or other industry standard PCMCIA release 2 0 card These slots are a type II 5mm and type III 10 5mm card thickness Expansion port The T4900CT has one unique 150 pin expansion port which attaches to a Desk Station IV RS 232C port The T4900CT has one 9 pin serial interface port PRT port The T4900CT s Centronics compatible...

Page 3: ... standard 3 5 mm diameter miniature stereo jack with speaker shut off switch Use a headphone with an impedance of 16W Microphone standard 3 5 mm diameter miniature monaural jack Accu point The T4900CT pointer control stick located in the center of the keyboard provides convenient control of the cursor without requiring desk space for a mouse ...

Page 4: ...1 4 T4900CT The T4900CT Personal Computer is shown in figure 1 1 The system configuration is shown in figure 1 2 Figure 1 1 T4900CT personal computer Figure 1 2 T4900CT system unit configuration ...

Page 5: ...T4900CT 1 5 1 2 System Unit Block Diagram Figure 1 3 is a block diagram of T4900CT system unit Figure 1 3 T4900CT system board block diagram ...

Page 6: ...ntrollers PIC 82C59 One Programmable Interval Timer PIT 82C54 One Floppy Disk Controller FDC TC8565 One Serial Input Output Controller SIO 16550 One Variable Frequency Oscillator VFO TC8568 One I O Controller One Printer Port Controller One Speaker Controller A Real Time Clock RTC One T9934 chip is used The T9934 has 128 bytes of memory Fourteen bytes of memory are used for the calendar and clock ...

Page 7: ...Hz is used for GA 14 31818 MHz for Video Controller OSC X3 generates 32 768 KHz for RTC Gate Array System Controller Gate Array This gate array has the following functions CPU Controller SMI Control CPU Clock Control Memory Controller 64 bit bus memory control standard DRAM area 32 bit bus memory control expansion memory area Bus Controller 64 to from 32 bit data path width convert 32 bit local bu...

Page 8: ... array has the following functions Status Indicator Panel Controller LCD Segment Flashing Controller Internal Communication Controller KBC Power Supply PS Micro Processor Interrupt Controller KBC PS microprocessor Main CPU Communication Controller IC Card Controller Gate Array This gate array has the following functions IC Card Controller PCMCIA IC Card Controller Toshiba Modem Card Controller EEP...

Page 9: ...cations for the FDD are described in table 1 1 Figure 1 4 3 5 inch FDD Table 1 1 3 5 inch FDD specifications Item 2 MB mode 1 MB mode Storage capacity KB Unformatted 2 000 1 000 Formatted 1 475 737 Number of heads 2 2 Number of cylinders 80 80 Access time ms Track to track 3 3 Average 94 94 Head settling time 15 15 Recording track density tpi 135 135 Data transfer rate Kbps 500 250 Rotation speed ...

Page 10: ...1 2 Figure 1 5 2 5 Inch HDD Table 1 2 2 5 Inch HDD specifications 810MB DVAA 2810 Physical specifications Formatted capacity MB 810 0 Disks 3 Heads 6 Cylinders 1 571 Bytes per sector bps 512 Cording 1 7RLL Performance specifications Access time average 14 5 track to track 4 Maximum stroke 23 5 Rotation speed rpm 3 800 Data transfer rate Mbps 24 9 to 36 0 Power requirement DC voltages V 5 only Powe...

Page 11: ...yboard is mounted on the T4900CT 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 Figure 1 6 Keyboard ...

Page 12: ...Video Graphics Array VGA and Super VGA SVGA for external display The T4900CT s LCD receives 18 bit data signals data enable and shift clock for data trans mission All signals are CMOS level compatible The TFT LCD and FL invertor board are shown in figure 1 7 The specifications for the LCD are described in table 1 3 Figure 1 7 TFT color LCD Table 1 3 TFT color LCD specifications Item Specifications...

Page 13: ... current to light the LCD s Fluorescent Lamp The specifications for the T4900CT s FL inverter are described in table 1 4 Table 1 4 FL inverter board specifications Item Specifications Input Voltage VDC 18 Power W 3 Output Voltage VAC 1 100 Current mA 4 0 Frequency KHz 47 Current limits mA 2 5 to 4 5 ...

Page 14: ...ity icon Power on icon and AC adapter icon on the status indicator panel 5 Turns the battery charging system on and off and detects a fully charged battery 6 Determines if the power can be turned on and off 7 Provides more accurate detection of a low battery 8 Calculates the remaining battery capacity The power supply output rating is specified in table 1 5 Table 1 5 Power supply board output rati...

Page 15: ...ecifications Battery name Material Output voltage Capacity Main battery Nickel Metal Hydride 12 V 2 600 mAh Backup battery Nickel Metal Hydride 7 2 V 35 mAh RTC battery Lithium Vanadium 3 0 V 50 mAh 1 8 1 Main Battery The removable main battery pack is the computer s main power source when the AC adapter is not attached The backup and main battery maintain the state of the computer when you enable...

Page 16: ... attached there are two types of quick charge quick charge 1 when the system is powered off and quick charge 2 when the system is powered on Table 1 7 Time required for quick charges Kind of battery Charging time Quick charge 1 Nickel Metal Hydride About 1 hour 30 minutes power off Quick charge 2 Nickel Metal Hydride 4 to 6 hours typical 5 hours power on NOTES 1 The time required for quick charge ...

Page 17: ...the AutoResume data is determined according to the following priority AC adapter Main battery Backup battery The backup battery is charged by the main battery or AC adapter when the system power is turned on and off Table 1 8 shows the charging time and data preservation period of the backup battery Table 1 8 Backup battery charging data preservation time Time Charging Time Power On 3 H Power Off ...

Page 18: ...k operations are described in Chapter 3 and detailed replacement proce dures are given in Chapter 4 The following tools are necessary for implementing the troubleshooting procedures 1 A T4900CT Diagnostics Disk 2 A Phillips head screwdriver 2 mm 3 A Toshiba MS DOS system disk 4 A 2DD or 2HD formatted work disk for floppy disk drive testing 5 A cleaning kit for floppy disk drive troubleshooting 6 A...

Page 19: ... password is registered and if it is ask him or her to enter the pass word If the user has forgotten the password contact your Toshiba representative for further action Verify with the customer that Toshiba MS DOS is installed on the hard disk Non Toshiba operating systems can cause the computer to malfunction Make sure all optional equipment is disconnected from the computer Make sure the floppy ...

Page 20: ...T4900CT 2 3 Figure 2 1 Troubleshooting flowchart 1 2 ...

Page 21: ...ocedures 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 proce dures in section 2 4 2 If an error is detected on the keyboard test perform the keyboard troubleshooting procedures in section 2 7 3 If an error is detected on the floppy disk test perform the floppy disk drive troublesh...

Page 22: ...e if the power supply is functioning properly start with Procedure 1 and continue with the other Procedures as instructed The procedures described in this section are Procedure 1 Power Status Check on Status Indicator Panel Procedure 2 Connection Check Procedure 3 Quick Charge Check Procedure 4 Replacement Check Procedure 5 Battery check ...

Page 23: ...power supply microprocessor monitors the status of the power supply When it detects an error the error is displayed on the Status Indicator Panel The status indicator panel will display the error status or other message Perform the follow ing procedures 1 Install the battery pack 2 Attach the AC adapter to DC IN 18 V Check the following items If DC IN icon does not light go to Procedure 2 If the b...

Page 24: ...s over the maximum allowed limit P02 Desk Station Voltage is over the maximum allowed limit P04 AC Adapter or Desk Station Current is over the maximum allowed limit P05 AC Adapter or Desk Station Current is not within the normal range while the power is off Battery Status Meaning P10 Battery Voltage is over the maximum allowed limit P11 Charge current is over the maximum allowed limit P12 Discharg...

Page 25: ...P40 12V Voltage is over the maximum allowed limit P41 12V Voltage is below the minimum allowed limit P42 M12V Voltage is not within the normal range Power Supply Microprocessor Status Meaning P50 Firmware error P51 Program error Power Supply On Off Sequence Status Meaning P60 Sub Battery Voltage is over the maximum allowed limit P61 Sub Battery Charge Current is over the maximum allowed limit Envi...

Page 26: ...exists go to Procedure 4 Check 5 When P80 is displayed it indicates that the computer s internal temperature is less than 20 C or more than 110 C Place the computer in the room air until the PC temperature normalizes If P80 is displayed even after the computer is placed in the room air until the PC temperature normalizes go to Procedure 4 A thermistor on the power supply board might be damaged Che...

Page 27: ...ke sure the AC adapter s cable and AC cord are firmly plugged into the DC IN 18 V socket and wall outlet If these cables are connected correctly go to Check 2 Check 2 Connect a new AC adapter If the battery capacity does not change on the 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 P...

Page 28: ...ter is not attached or AC adapter s output voltage is abnormal Check 1 2 The battery pack is not installed or battery s output voltage is abnormal Check 2 3 The battery pack is not installed or the battery s temperature is abnormal Check 3 4 The battery pack is fully charged Normal 5 Other reason Check 4 Check 1 Make sure the AC adapter s cable and AC cord are firmly plugged into the DC IN socket ...

Page 29: ...king the connection perform the following checks Check 1 Replace the power supply board with a new one If the power supply is still not functioning properly perform Check 2 Check 2 Replace the upper system board with a new one If the power supply is still not functioning properly perform Check 3 Check 3 Replace the lower system board with a new one If the power supply is still not functioning prop...

Page 30: ...e following reasons may apply Battery was not used for long period of time Battery charging was started with the temperature difference between the computer and the battery pack at more than 10 C A cold battery was installed into an overheated PC Then perform the following checks Check 1 Fully discharge the battery by leaving the computer power on until it automatically turns off Check 2 Connect t...

Page 31: ...rly 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 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 ...

Page 32: ...age instructs the system configuration in the RTC memory configuration is set to the default setting If error message b often appears when the power is turned on replace the RTC battery If any other error message is displayed perform Check 2 a Error in CMOS Bad HDD type Check system Then press F1 key b Error in CMOS Bad battery Check system Then press F1 key c Error in CMOS Bad check sum Check sys...

Page 33: ...oce dures in section 2 6 If error message 23 or 24 is displayed go to the FDD Troubleshooting Proce dures in section 2 5 1 TIMER CH 2 OUT ERROR 2 PIT ERROR 3 MEMORY REFRESH ERROR 4 FIRST 64KB MEMORY ERROR 5 RTC ERROR 6 CRTC ERROR 7 VRAM ERROR 8 KBC ERROR 9 SYSTEM MEMORY ERROR 10 SYSTEM MEMORY PARITY ERROR 11 EXTENDED MEMORY ERROR 12 EXTENDED MEMORY PARITY ERROR 13 DMA PAGE REGISTER ERROR 14 DMAC 1...

Page 34: ...T4900CT s power 4 Read the LED status from left to right as you are facing 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 2 2 perform Check 1 NOTE If an error condition is detected by the IRT test the printer port LED displays ...

Page 35: ...initialize 0DH Interrupt vector initialization 18H PIC initialization 1FH Display initialization CRTC ERROR VRAM ERROR READ DATA XXXXXXXXH WRITE DATA XXXXXXXXH 25H System memory test SYSTEM MEMORY ERROR ADDRESS XXXXXXXXH READ DATA XXXXXXXXH WRITE DATA XXXXXXXXH SYSTEM MEMORY PARITY ERROR ADDRESS XXXX0000H XXXXFFFFH 30H Extended memory test EXTENDED MEMORY ERROR ADDRESS XXXXXXXXH READ DATA XXXXXXXX...

Page 36: ...XH WRITE DATA XXH PIC 2 ERROR READ DATA XXH WRITE DATA XXH 50H Mouse initialization 55H KBC initialization 5AH Password 60H HDD initialization HDC ERROR HDC 0 ERROR HDC 1 ERROR 62H Hard RAM initialization 65H FDD initialization NO FDD ERROR FDD ERROR 70H Printer test 80H RS 232 C test 90H Timer initialization TIMER INTERRUPT ERROR RTC UPDATE ERROR A0H NDP initialization A6H Expansion I O ROM C0H B...

Page 37: ... 25h 30h 40h 41h 42h 55h 65h 70h 80h 90h A0h A6h Check 2 If error code 4Ah is displayed go to the Keyboard Troubleshooting procedures in section 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 ...

Page 38: ...e T4900CT s power 5 Read the LED status from left to right as you face the back of the computer 6 Convert the status from binary to hexadecimal notation 7 If the final LED status is FFh normal status go to Procedure 4 8 If the final LED status matches any of the test status values in table 2 4 go to Procedure 5 Table 2 4 Printer port LED resume mode error status Error status Meaning of status F0H ...

Page 39: ...ests from the Diagnostic Test Menu Refer to Chapter 3 Tests and Diagnostics for more information on how to perform these tests 1 System test 2 Memory test 3 Printer test 4 ASYNC test 5 Real Timer test 6 NDP test 7 Expansion test If an error is detected during these tests go to Procedure 5 ...

Page 40: ...e mode detects the following codes go to Check 1 00H F0H F1H F4H F5H F6H F7H F8H F9H FAH FBH FEH If the IRT test Resume mode detects the following codes go to Check 2 F2H FDH If the following diagnostic test detects the error go to Check 1 System test Memory test Real Timer test NDP test If the following diagnostic test detects the error go to Check 2 Printer test ASYNC test Expansion test Check 1...

Page 41: ...ocedure 2 Diagnostic Test Program Check Procedure 3 Connector Check and Replacement Check Procedure 1 FDD Head Cleaning Check FDD head cleaning is one option available in the Diagnostic Program Detailed 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 ...

Page 42: ... abled If any other errors occur while executing the FDD diagnostics test go to Check 1 Table 2 5 Floppy disk drive error code and status 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...

Page 43: ...Make sure the two joint connectors PJ301 and PJ302 are firmly connected to the upper system board If these joint connectors are disconnected connect them to the upper system board and repeat Procedure 3 If the FDD is still not functioning properly per form Check 3 Check 3 The FDD or its cable may be defective or damaged Replace the FDD with a new one following the steps in Chapter 4 Replacement Pr...

Page 44: ...he 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 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 choos...

Page 45: ...this message will disappear or HDD 1 ERROR After 5 seconds this message will disappear 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 ...

Page 46: ...DD pack connector is firmly connected to the lower system board Remove the HDD pack and reinstall it If the HDD is still not functioning properly perform Check 2 Check 2 Disassemble the HDD pack Make sure the HDD pack connector is firmly con nected to the HDD If it is disconnected connect it to the HDD If the HDD is still not functioning properly perform Check 3 Check 3 Make sure the two joint con...

Page 47: ...ge 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 T4900CT Diagnostic Disk format the HDD with a low level format option Refer to Chapter 3 Tests and Diagnostics for more information about the diagnostic program If the following message appears...

Page 48: ...orm Procedure 6 The error codes and statuses are described in table 2 6 If an error code is not generated the HDD is operating properly Table 2 6 Hard disk drive error code and status Code Status 01h Bad command 02h Bad address mark 04h Record not found 05h HDC not reset 07h Drive not initialized 09h DMA boundary error 0Ah Bad sector error 0Bh Bad track error 10h ECC error 11h ECC recover enabled ...

Page 49: ...ter 4 Replacement Procedures and perform the following checks Check 1 Replace the HDD with a new one If the HDD is still not functioning properly perform Check 2 Check 2 Replace the HDD pack connector with a new one If the HDD is still not func tioning properly perform Check 3 Check 3 Replace the lower system board with a new one If the HDD is still not function ing properly perform Check 4 Check ...

Page 50: ...ure 2 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 T4900CT 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 Keyboard cable PJ9 Upper system board If this cabl...

Page 51: ...he T4900CT s display is functioning properly Start with Procedure 1 and continue with the other procedures as instructed Procedure 1 Hot Key Check Procedure 2 External CRT Check Procedure 3 Diagnostic Test Program Execution Check Procedure 4 Connector Check Procedure 5 Replacement Check ...

Page 52: ... this mode the display becomes blank and the keyboard is locked to prevent others from gaining access to your computer To restore the computer from the instant security mode enter the instant password or turn the power off and back on Check 3 Pressing the Fn arrow key increases or decreases the brightness of color LCD panels Increases the brightness of the LCD panel Decreases the brightness of the...

Page 53: ...board The FL unit and FL inverter board are connected by one cable The FL inverter board and upper system board are connected by one cable The LCD module and system board are connected by one 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 ...

Page 54: ...h 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...

Page 55: ...re 2 Connector and Replacement Check The status indicator panel is connected to the system board This cable may be disconnected or damaged Disassemble the T4900CT 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 Status Indicator Panel cable PJ8 System board If thi...

Page 56: ...nal 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 SOUND TEST You will need the following equipment to perform some of the T4900CT s Diagnostic test programs The T4900CT Diagnostics Disk all tests A formatted working disk for the floppy disk drive test all tests 3 5 inch 2HD 2DD disk for the 3...

Page 57: ...T 7 FDD UTILITIES 8 SYSTEM CONFIGURATION 9 EXIT TO MS DOS 0 SETUP Select items Enter Specify Esc Exit NOTE To exit the 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 test program If the following message appears on the screen open the computer s CONFIG SYS file Cannot execute in a virtual 8086 mode The computer s CONFIG...

Page 58: ...ems Enter Specify Esc Exit Refer to sections 3 4 through 3 15 for detailed descriptions of Diagnostic Tests 1 through 12 Function 88 sets the floppy disk drive and hard disk drive error retry count 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 will appear SYSTEM TEST XXXXXXX TXX...

Page 59: ...o the desired option and press Enter Selecting YES 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 Terminates the test program and exits to the subtest menu 2 Continues the test 3 Restarts the test...

Page 60: ...e memory 3 KEYBOARD 01 Pressed key display 82 84 02 Pressed key code display 03 PS 2 Mouse connect check 04 IPS 4 DISPLAY 01 VRAM read write 02 Character attributes 03 Character set 04 80 25 30 Character display 05 320 200 Graphics display 06 640 200 Graphics display 07 640 350 480 Graphics display 08 Display page 09 H pattern display Border color 10 LCD DAC pallet 11 TFT color display 12 Status i...

Page 61: ...ead 02 Address uniqueness 03 Random address data 04 Cross talk peak shift 05 Write read compare CE 06 Write specified address 07 Read specified address 08 ECC circuit 09 Sequential write 10 W R C specified address 9 REAL TIMER 01 Real time 02 Backup memory 03 Real time carry 10 NDP 01 NDP test 11 EXPANSION 01 PCMCIA Wrap around 12 SOUND 01 CODEC REC PLAY 02 SIN wave playback 03 FM Synthesizer ...

Page 62: ...64KB Subtest 02 H W status This test reads and displays the hardware status as shown below 76543210 H W status 10001000 Bit7 Bit6 CPU clock 75MHz Bit5 Notch signal 2HD Bit4 FDD type 2MB Bit3 Bit2 Bit1 Bit0 Internal FDD 2HD Table 3 2 describes the hardware bit status for each bit tested Pressing Enter returns you to the Sub Test Menu Table 3 2 Hardware bit status Bit H W status 1 0 7 Reserved 6 CPU...

Page 63: ...ker beeps and displays the following screen image To exit this screen press the S key When the read information is higher the display is unchanged ROM BIOS V1 00 OK V1 10 ROM BOOT V1 00 OK V1 00 KBC Version V1 00 NG V0 90 PS Micom Version V1 40 OK V1 40 Reference data Current data Subtest 04 Main battery charge This subtest executes the quick charge to main battery The following message is display...

Page 64: ... data created by the exclusive ORing XORing to the address segment and address offset in conventional memory program end to 640 KB then reads the new data and compares the result with the original data Subtest 03 RAM refresh real mode This subtest writes a 256 byte unit of constant data to conventional memory 0 to 640 KB then reads the new data and compares the result with the original data The co...

Page 65: ...ecting subtest 05 the following message will appear Extended memory size 1 4 MB 2 8 MB 3 16 MB 4 32 MB Select the number that corresponds to the memory card installed in the T4900CT Subtest 06 Cache memory To test the cache memory a pass through write read comparison of 5A data is run repeatedly to test area 7000 Program size to 7000 7FFF 32 KB to check the hit miss ratio on off status One test ta...

Page 66: ...s Enter Subtest 01 Pressed key display 82 84 NOTE The Num Lock and the Overlay mode must be off to execute this subtest When you execute this subtest the keyboard layout is drawn on the display as shown below 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 KEYBO...

Page 67: ...n in Appendix D KEYBOARD TEST IN PROGRESS 302000 Scan code Character code Keytop Ins Lock Caps Lock Num Lock Scroll Lock Alt Ctrl Left Shift Right Shift PRESS Enter KEY Subtest 03 PS 2 mouse connect check NOTE To execute the PS 2 mouse connect check a PS 2 mouse must be connected to the computer This subtest checks whether a PS 2 mouse is connected or not If this test does not detect an error it r...

Page 68: ...PS motion response from the IPS stick and IPS switch by displaying the location parameters When the stick is pressed towards the upper left the POINTING display changes to the following image If an IPS switch is pressed the BUTTON display alternates black and white and appears on the right side of the display If two IPS switches are pressed it returns to the subtest menu PRESS BUTTON1 BUTTON2 THEN...

Page 69: ... displays the following character attribute modes normal intensi fied reverse and blinking as shown in the display below The character attribute modes display the foreground color and intensified color 16 colors or 16 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 ATTRI...

Page 70: ...x200 graphics mode as shown below 320 200 GRAPHICS DISPLAY 13 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...

Page 71: ...VWXYZ _ abcdefghijklmnopq 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqr 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqrs 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqrst 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqrstu 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqrstuv 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmnopqrstuvw 01234...

Page 72: ... Graphics display mode 10 74 12 This subtest displays even dots odd dots and all dots in the 640x350 and 640x480 dot graphics mode 10 74 12 as shown below Pressing Enter changes the size of the displayed image To exit this subtest and return to the DISPLAY TEST menu press Ctrl Break 640 XXX GRAPHICS DISPLAY EVEN DOTS ODD DOTS ALL DOTS DRIVEN DRIVEN DRIVEN PRESS Enter KEY 640 200 GRAPHICS DISPLAY X...

Page 73: ...HHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH...

Page 74: ...tch test 1 256 times 2 endless To exit press Ctrl Break Then press Enter Subtest 11 TFT color display This subtest displays eight screens The first shows many colors mode 13 at once The next three display 64 shades mode 13 of red green and blue successively Next a single screen displays many colors mode 5F The last three screens display 256 shades mode 5F of red green and blue Press Enter to chang...

Page 75: ...e floppy disk in the test drive to be tested and press Enter Media in drive X mode 0 2DD 1 2D 2 2D 2HD 2DD 3 2HD 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 Enter 0 dd 00 79 4 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 ...

Page 76: ...c 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 step 3 above 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 step 3 above...

Page 77: ...o 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 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklm 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmn 0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ _ abcdefghijklmno 0123456789 ABCDEFGHIJKLMNOPQRSTUV...

Page 78: ...ctor must be connected to the computer s printer port The printer wraparound con nector 34M741986G01 wiring diagram is described in Appendix G This subtest checks the output and bidirectional modes of the data control and status lines through the printer wraparound connector PRINTER TEST 1 THIS LINE SHOWS NORMAL PRINT 2 THIS LINE SHOWS DOUBLE WIDTH PRINT 3 THIS LINE SHOWS COMPRESSED PRINT 4 THIS L...

Page 79: ...nel 3 XXXXh Select the Channel number 1 3 The serial I O port address is specified by the XXXXh number Select the serial port channel number and press Enter to start the subtest Subtest 01 Wraparound board NOTE To execute this subtest an RS 232 C wraparound connector 34M741621G01 must be connected to the RS 232 C port The wrap around connector wiring diagram for the RS 232 C is described in Append...

Page 80: ...ive This subtest is used with subtest 03 described above This subtest receives the data from the send side then sends the received data Subtest 04 Interrupt Test This subtest checks the Interrupt Request Level of IRQ 4 3 and 5 from the send side ...

Page 81: ...command which will set the partition Then execute the Toshiba MS DOS FORMAT command Refer to the Toshiba MS DOS manual for details 1 When you select the hard disk test from the DIAGNOSTIC TEST MENU the following message will appear Test drive number select 1 HDD 1 2 HDD 2 0 HDD1 2 2 Select the hard disk drive number to be tested and press Enter The following message will appear HDC F W error retry...

Page 82: ...st two digits indicate the error status code as explained in table 3 3 Subtest 01 Sequential Read This subtest is a sequential reading of all the tracks on the HDD starting at track 0 When all the tracks on the HDD have been read the test starts at the maximum track and reads the tracks on the HDD sequentially back to track 0 Subtest 02 Address Uniqueness This subtest writes unique address data to...

Page 83: ...CE cylinder and compares it with the original data Subtest 06 Write specified address This subtest writes specified data to a specified cylinder and head on the HDD Subtest 07 Read specified address This subtest reads data which has been written to a specified cylinder and head on the HDD Subtest 08 ECC circuit This subtest checks the Error Check and Correction ECC circuit functions of the specifi...

Page 84: ...nt time XX XX XX Enter new date PRESS ENTER KEY TO EXIT TEST b If the current date is not correct input the correct date at the Enter new date prompt and press Enter The following prompt will appear Enter new time c If the current time is not correct input the correct time in 24 hour format Pressing Enter toggles between the time and the date To exit press Ctrl Break Subtest 02 Backup Memory This ...

Page 85: ...rased This subtest checks the real time clock increments making sure the date and time are displayed in the following format Current date 12 31 1992 Current time 23 59 58 Pressing Enter displays the following Current date 1 01 01 1993 Current time 00 00 00 PRESS Enter KEY TO EXIT TEST Press Ctrl Break to exit ...

Page 86: ... TEST MENU press Enter and follow the directions on the screen The NDP test contains one subtest that tests the T4900CT s NDP functions Subtest 01 NDP test This test checks the following functions of NDP Control word Status word Bus Addition Multiplication Press Ctrl Break to exit ...

Page 87: ...test slot number of the PCMCIA slot to be tested and press Enter Subtest 01 PCMCIA Wraparound NOTE To execute this subtest the PCMCIA wraparound card is re quired This test checks the following signal line of the PCMCIA slot Address line REG CE 1 CE 2 line Data line Speaker line Wait line BSY BVD1 line This subtest is executed in the following order Sub Address Good Bad Contents 01 00001 nn xx Add...

Page 88: ...ter At the same time test the microphone and headphone terminals When you execute AD1848 com a key input message is displayed Press Enter to record sound Immediately after recording the sound will be played Subtest 02 SIN wave playback Use DMA and IRQ to play previously sampled sine wave data The channels used are DRQ1 and IRQ7 Subtest 03 FM Synthesizer Test the OPL3 YMF262 functions The sound int...

Page 89: ...or MEMORY 01 Parity Error 02 Protected Mode Not Changed DD Cache Memory Error KEYBOARD 03 Mouse Interface Error 04 Pointing Stick Interface Error FDD 01 Bad Command 02 Address Mark Not Found 03 Write Protected 04 Record Not Found 06 Media Removed 08 DMA Overrun Error 09 DMA Boundary Error 10 CRC Error 20 FDC Error 40 Seek Error 60 FDD Not Drive Error 80 Time Out Error EE Write Buffer Error PRINTER...

Page 90: ...05 HDC Not Reset Error 07 Drive Not Initialized 08 HDC Overrun DRQ 09 DMA Boundary Error 0A Bad Sector 0B Bad Track Error 10 ECC Error 11 ECC Recover Enabled 20 HDC Error 40 Seek Error 80 Time Out Error AA Drive Not Ready BB Undefined Error CC Write Fault E0 Status Error NDP 01 No Co processor 02 Control Word Error 03 Status Word Error 04 Bus Error 05 Addition Error 06 Multiplay Error PCMCIA C1 Ad...

Page 91: ...e HDC status register and error register are described in tables 3 4 and 3 5 Table 3 4 Hard disk controller status register contents Bit Name Description 7 BSY 0 HDC is busy Busy 1 HDC is ready 6 DRDY 0 Hard disk drive is not ready to accept any command Drive ready 1 Hard disk drive is ready 5 DWF 0 DWF error is not detected Drive write fault 1 Write fault condition occurred 4 DSC 0 The hard disk ...

Page 92: ...ctable 1 Uncorrectable data error has been detected 5 Not used 4 IDNF 0 Other Identification 1 There was no ID field in the requested sector 3 Not used 2 ABRT 0 Other Abort 1 Illegal command error or a drive status error occurred 1 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 0 Not used ...

Page 93: ...ogram is executed Before executing the function transfer the contents of the hard disk onto a floppy disk s This can be done with the Toshiba MS DOS BACKUP command See the Toshiba MS DOS manual for details 3 18 1 Function Description 1 All track FORMAT This option performs a low level format of all the tracks on the hard disk as shown in Table 3 6 below NOTE Before executing the all track format o...

Page 94: ...er than a bad track is detected the program is automatically termi nated 3 18 2 Operations CAUTION 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 Selecting test 2 in the DIAGNOSTIC MENU and pressing Enter displays the fol...

Page 95: ... prompt will appear as shown below Enter the cylinder and head numbers of bad tracks and press Enter Note that if there are no bad tracks pressing Enter alone is the same as executing the All Track Format described in item e below WARNING Current DISK data will be completely destroyed Press Bad cylinder number dddd key Press Bad head number dd key Enter the cylinder and head number in the format a...

Page 96: ...AT To format a track as a bad track enter the number for drive interleave cylinder and head as indicated in the screen prompt shown below Drive number select 1 1 2 2 Interleave number 1 1 8 Press Cylinder number dddd Press Head number dd Press Enter to return to the Hard Disk Format menu 4 Bad track CHECK This subtest reads the entire disk and displays a list of bad tracks The test is terminated i...

Page 97: ...ting test 4 from the DIAGNOSTIC MENU and pressing Enter displays the following messages DIAGNOSTICS FLOPPY DISK HEAD CLEANING VX XX Mount cleaning disk s on drive s Press any key when ready 2 Remove the Diagnostics Disk from the FDD Then insert the cleaning disk and press Enter 3 When the cleaning start message appears the FDD head cleaning has begun 4 The display automatically returns to the DIAG...

Page 98: ...atus STS 6 FDD HDD or memory address ADDR 7 Write data WD 8 Read data RD 9 HDC status HSTS 10 Error status name ERROR STATUS NAME 3 20 2 Operations 1 Select 5 and press Enter on the DIAGNOSTIC MENU to log error information into RAM or onto a floppy disk The error information is displayed in the follow ing format XXXXX ERRORS CNT TS NAME PASS STS ADDR WD RD HSTS STATUS NAME 001 FDD 02 0000 103 0000...

Page 99: ...s page The 3 key returns to the Diagnostic Menu The 4 key erases all error log information in RAM The 5 key outputs the error log information to a printer The 6 key reads the log information from a floppy disk The 7 key writes the log information to a floppy disk 3 In the case of error retry OK a capital R will be placed at the beginning of the error status However it is not added to the error cou...

Page 100: ...oad a work disk in the FDD If a work disk is not loaded an error will be generated during the FDD testing 1 Remove the diagnostics disk from the floppy disk drive and insert the work disk 2 Select 6 from the Diagnostic Menu and press Enter the following message will be displayed Printer wrap around test Y N Selecting Y yes executes the printer wraparound test A printer wraparound connector must be...

Page 101: ...press Enter The following message will appear Mount the work disk s on the drive s then press Enter key Warning The contents of the disk s will be destroyed 5 This program is executed continuously To terminate the program press Ctrl Break ...

Page 102: ...density 48 67 5 TPI MFM mode 512 bytes 9 sectors track b 2DD Double sided double density double track 96 135 TPI MFM mode 512 bytes 9 sectors track c 2HD Double sided high density double track 96 135 TPI MFM mode 512 bytes 18 sectors track 2 COPY This program copies data from a source floppy disk to a target floppy disk 3 DUMP This program displays the contents of the floppy disk and the designate...

Page 103: ...insert the work disk and press any key The following message will be displayed when the FDD format is executed FDD TYPE TRACK XXX FDD TYPE HEAD X FDD TYPE SECTOR XX Format start track head XXX X After the floppy disk is formatted the following message will appear Format complete Another format 1 Yes 2 No e Type 1 to display the message from step c above Type 2 to return the test to the DIAGNOSTIC ...

Page 104: ... copy another disk type 1 and the message from step a will be displayed again Entering 2 returns the test program to the DIAGNOSTIC MENU 4 DUMP program a When dump is selected the following message appears DIAGNOSTICS HARD DISK FLOPPY DISK DUMP VX XX Drive type select 1 FDD 2 HDD b Select a format type number If 2 is selected the display will go to step e Select FDD number 1 A 2 B c Select a drive...

Page 105: ...d disk drives 9 The number of printer ports 10 Extended Memory Size 11 PS Micom Version 12 Battery Type 13 Display Controller Type 3 23 2 Operations Select 8 from the DIAGNOSTIC MENU and press Enter to display the following system configuration SYSTEM CONFIGURATION BIOS BOOT ROM VER VX XX VGA F65545 VX XX 1 MATH CO PROCESSOR KBC VERSION VX XX 639KB MEMORY 1 FLOPPY DISK DRIVE S 1 ASYNC ADAPTER 1 HA...

Page 106: ... Mode d LDC Display Colors e Power On Display f Text Mode Stretch 3 COM PRT a Serial Port b Int Parallel Port c DS Parallel Port 4 HARD DISK a HDD Mode 5 BATTERY a Battery Save Mode b Battery Display c Manual Set of Battery Level 6 POWER ON PASSWORD 7 OTHERS a Power up Mode b CPU Cache c Speaker Volume d Panel Power On Off e Alarm Power On f Pointing Devices g Hotkey h Boot Priority i Sound I O Ad...

Page 107: ... and press Enter to display the following Select items Space BkSp Change values Esc Exit without saving Home Set default values End Save changes and Exit DISPLAY POWER ON PASSWORD Not Registered Battery Save Mode Economy Power Battery Display Time Manual Set of Battery Level E F Total 8192KB Base 640KB Extended 7360KB Shadow BIOS ROM 192KB OTHERS Display Adapter VGA Compatible LCD Display Mode Col...

Page 108: ...UP Options The SETUP screen is divided into functionally related groups This section describes each group and its options 1 Memory These options list the computer s memory allocations The values displayed cannot be changed a Total This field displays the total amount of memory installed and is automatically calculated by the computer b Base This field displays the amount of base conventional memor...

Page 109: ...on to set the computer s display mode Color Displays in color mode in a maximum of 4096 or 226K colors Default Monochrome Displays in the monochrome mode The intensity levels of gray are converted to the appropriate intensity levels of gray for the color LCD c Ext Scan Mode This option selects interlace or non interlace mode for an external monitor with a resolution of 1 024 x 768 pixels Interlace...

Page 110: ...displayed 256K Colors Supports 256K 262 144 colors e Power On Display This option selects the display on which the system starts up when the computer is turned on The default setting is Internal External Once the system starts up you can switch the active display by using the hot key Fn F5 Internal External The system starts up by using the internal display if no external display is attached or by...

Page 111: ... b Internal Parallel Port This option sets the parallel port mode for the PRT port If the Desk Station is not attached the following settings are available LPT1 378H Activates parallel port as LPT1 Default LPT2 278H Activates parallel port as LPT2 LPT3 3BCH Activates parallel port as LPT3 Not used Disables parallel port operation c DS Parallel Port This option sets the communication mode for the P...

Page 112: ...on using the Hot Key Full Power Selects a preset set of battery save parameters Economy Power suitable for either Full Power Economy Power or Low Power Low Power operation Selecting this option User Setting displays a sub window of BATTERY SAVE OPTIONS like the ones shown here Options in the sub windows cannot be changed and are for informational purposes only Full Power The following shows full p...

Page 113: ... the automatic setting feature Full Power 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 and Low Power User settings lets you select the following options Processing Speed This option is used to set the CPU operating speed to High or Low Processing speed CPU s...

Page 114: ...ff power to the hard disk drive if it is not used for the duration set The duration xx can be set to 3 5 10 15 20 or 30 minutes System Auto Off This option enables or disables the system automatic power off and is selectable only if the Power up Mode option is set to Resume When automatic power off is enabled the duration can be programmed to any of the intervals listed below Disabled System autom...

Page 115: ...the status indicator panel cannot indicate the charge level because the T4900CT cannot estimate the remaining battery capacity This option allows you to set the charge level of the battery A horizontal bar graph between the values E Empty and F Full represents the amount of charge You can manually set the charge level by using the Space and Backspace keys The options are E F The charge level is 10...

Page 116: ...ect It sets the cache mode of the CPU Write back Caching for memory write Default Write through Caching for memory read When the CMOS checksum error or bad battery error is detected this value is set to the Write back mode Even if the setup default Home key is selected this value will not be changed c Speaker Volume This option sets software use of the system speaker Setting this option to off dis...

Page 117: ... enables or disables the alarm when you close the panel Enabled Enables the panel close alarm when you close the panel Default Disabled Disables the alarm when you close the panel d Panel Power On Off This option enables and disables automatic panel close suspend This option automatically turns off the computer when the display panel is closed and turns on the computer when the display panel is op...

Page 118: ...abled when a PS 2 mouse is connected otherwise the AccuPoint is enabled Default Simultaneous If a PS 2 mouse is connected to the PS 2 mouse port both the AccuPoint and the external mouse are enabled g Boot Priority This option specifies the priority of the disk drive from which the computer attempts to load the operating system when you turn it on FDD HDD FDD A HDD HDD FDD HDD FDD A NOTE If you tu...

Page 119: ...to Off disables the sound system so that you can save more battery power than setting the Windows Sound System s audio value to zero i Ext Keyboard Fn key equivalent This option is used to let substitute keys function as the Fn key Disable Disables any key serve for Fn key Default Left Ctrl Left Alt Left Ctrl Left Alt functions as the Fn key Right Ctrl Right Alt Right Ctrl Right Alt functions as t...

Page 120: ... start by removing the battery pack then follow the lines on the chart to determine which FRU you must remove next in order to repair the one you think is causing the T4900CT to operate improperly Battery Pack Optional Memory Card Optional PCMCIA Card Hard Disk Pack Hard Disk Drive Top cover Keyboard Status Indicator Panel Backup Battery Microphone TFT Color LCD Display Upper System Board Power Su...

Page 121: ...nutes after turning off the power before you begin disas sembly The T4900CT s processor operates at high temperature and there is a danger of incurring burns if you touch the chassis while it is hot Warning If you need to operate the machine while it is partially disassembled be sure that each PCB is mounted on the middle frame and that the upper system board cover is securely mounted The system b...

Page 122: ...the various pieces in place Screw sizes are listed in the corresponding figures 9 The T4900CT contains many sharp edges and corners so be careful not to injure yourself 10 After you have replaced an FRU make sure the T4900CT is functioning properly by performing the appropriate test on the FRU you have fixed or replaced Disassembly Procedures The T4900CT has two basic types of cable connectors Pre...

Page 123: ...ned it could come loose creating a danger of a short circuit which could cause heat and smoke If you replace the battery pack RTC battery or backup battery be sure to use only the same model battery or an equivalent battery recommended by Toshiba Installation of the wrong battery can cause the battery to explode After installing an FRU in the T4900CT confirm that the FRU and the T4900CT are func t...

Page 124: ... press the release button until it clicks The battery will pop out slightly 4 Firmly grasp the battery pack and pull it out Figure 4 1 Removing the battery pack Installing the Battery Pack NOTE The battery pack is designed to fit into the T4900CT in only one way To install the T4900CT battery pack follow the steps below and refer to figure 4 1 1 Gently slide the battery pack into the battery slot ...

Page 125: ...attery pack as described in section 4 2 3 Open the cover to the expansion memory slot located on the left side of the com puter figure 4 2 Figure 4 2 Opening the cover 4 Grasp the plastic tab and pull it so that the card comes partially out of the com puter figure 4 2 5 Grasp the optional memory card and pull it completely out figure 4 3 Figure 4 3 Removing the optional memory card CAUTION DO NOT ...

Page 126: ... the word insert and an arrow pointing toward the connecting edge Turn the memory card so that it is facing up and carefully insert the connecting edge arrow first into the slot Push gently to ensure a firm connection figure 4 3 2 Close the expansion memory cover figure 4 2 3 Install the battery pack as described in section 4 2 The T4900CT automatically configures all additional memory as extended...

Page 127: ... cables connected to the T4900CT 2 Remove the battery pack as described in section 4 2 3 To remove a card from the PCMCIA card slot 2 center pull up the slot cover to expose the card 4 Push the eject button to pop the card slightly out then grasp the card and pull it completely out figure 4 4 Figure 4 4 Removing the card from the PCMCIA card slot 2 5 To remove a card from the PCMCIA card slot 1 sl...

Page 128: ...d making sure the card is right side up and the contact surface is inserted first figure 4 4 2 When the card is almost fully seated you will feel some resistance Press gently until the eject button pops out Do not force the card into position 3 Close the slot cover 4 To install a PCMCIA card into PCMCIA card slot 1 carefully insert the card making sure the card is right side up and the contact sur...

Page 129: ...hrough 4 10 1 Turn off the power to the T4900CT Disconnect the AC adapter power cord and all external cables connected to the T4900CT 2 Remove the battery pack as described in section 4 2 3 Turn the computer upside down 4 Remove two M2 5x30 screws securing the HDD pack slot cover and lift off the cover figure 4 7 Figure 4 7 Removing the HDD pack cover ...

Page 130: ...m the computer 7 Insert a fingernail or similar object under the notch on the HDD pack lift it and pull up to remove the HDD pack figure 4 8 Figure 4 8 Removing the HDD pack 8 Remove the VOID seal and remove four M3x4 flat head screws securing the case to the HDD pack Open the case and lift out the HDD pack figure 4 9 Figure 4 9 Removing the cover ...

Page 131: ... 4 9 and 4 10 2 Align the screw holes in the HDD and case then secure the HDD with two flat head screws at the end opposite the FPC connector figure 4 9 3 Fit the plastic tab into slots on the bottom half of the case and seat the HDD pack cover into the case figure 4 7 4 Close the case and secure the remaining two flat head screws 5 Apply a new VOID seal to the HDD pack 6 Seat the HDD pack in the ...

Page 132: ...Disconnect the AC adapter power cord and all external cables connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA cards and HDD pack as described in sections 4 2 through 4 5 3 Turn the computer upside down and remove one M2 5x30 screw and two M2 5x11 screws figure 4 11 Figure 4 11 Removing screws bottom of the computer securing the top cover ...

Page 133: ...cover 5 Turn the computer around so the front faces you and open the display Lay the display back fully Put a book or small box behind the display to support it 6 Unsnap the 12 latches securing the top cover to the bottom cover Start by pressing on the front of the top cover just in front of the space bar and rotate the keyboard s front edge toward you to release the front latches figure 4 13 7 Co...

Page 134: ... all 14 latches are snapped figure 4 13 3 Close the display 4 Fasten the four M2 5x6 silver screws at the back of the T4900CT to secure the top cover If you removed them also fasten two M2 5x6 screws to secure the bottom cover figure 4 12 5 Turn the computer over 6 Secure one M2 5x30 screw and two M2 5x11 screws on the bottom of the T4900CT figure 4 11 7 Install the HDD pack optional PCMCIA card o...

Page 135: ...r power cord and all external cables connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack and top cover as described in sections 4 2 through 4 6 3 Carefully lift off the keyboard to expose the keyboard connector 4 Disconnect the keyboard cable from the pressure plate connector PJ9 on the upper system board Figure 4 14 Removing the keyboard ...

Page 136: ...onnector PJ9 on the upper system board 2 Seat the keyboard in the T4900CT Note that a fold is built into the keyboard cable Do not try to bend the cable at any other point when you install the key board Figure 4 15 Seating the keyboard 3 Install the top cover HDD pack optional PCMCIA card optional memory card and battery pack as described in sections 4 6 back through 4 2 ...

Page 137: ...adapter power cord and all external cables connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack and top cover as described in sections 4 2 through 4 6 3 Remove the tape securing the status indicator panel cable 4 Disconnect the status indicator panel cable from PJ8 on the upper system board and lift the panel out of its brackets Figure 4 16 Removing...

Page 138: ... Set the status indicator panel in the upper system board cover making sure it is seated securely in its brackets Note that a fold is not built into the status indica tor panel cable Let the cable bend naturally when you seat the panel do not try to fold the cable 3 Secure the status indicator panel cable with tape 4 Install the top cover HDD pack optional PCMCIA card optional memory card and batt...

Page 139: ...connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack and top cover as described in sections 4 2 through 4 6 3 Remove the tape securing the backup battery 4 Disconnect the backup battery cable from PJ5 on the upper system board then remove the tape securing the backup battery cable 5 Lift up the microphone slightly and disconnect the microphone cable...

Page 140: ...low the steps below and refer to figures 4 18 through 4 20 1 Fit the two notches on the microphone onto two prongs on the computer figure 4 18 Figure 4 18 Installing the microphone 2 Secure the backup battery cable with tape Part of the cable is wrapped under the battery s green plastic cover When you tape the cable be sure it is aligned with the part that is under the green cover and leave a smal...

Page 141: ... front of the microphone to connect it to PJ12 on the upper system board figure 4 20 Figure 4 20 Installing the backup battery 4 Lay the backup battery and cables in place on the computer and secure them with tape figure 4 20 5 Install the top cover HDD pack optional PCMCIA card optional memory card and battery pack as described in sections 4 6 back through 4 2 ...

Page 142: ...T4900CT Disconnect the AC adapter power cord and all external cables connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack and top cover as described in sections 4 2 through 4 6 3 Remove the tape securing the panel close switch cable then disconnect it from PJ6 on the upper system board figure 4 21 Figure 4 21 Removing the panel close switch cable ...

Page 143: ...re 4 22 5 Remove the M2 5x6 screw securing the display ground cable figure 4 22 Figure 4 22 Removing the display FL and ground cables 6 Turn the computer around and remove the two M2 5x6 silver screws on the back of the computer which secure the display assembly figure 4 23 Figure 4 23 Removing the screws back of computer securing the display assembly ...

Page 144: ...d remove the three M2 5x6 screws securing the display hinges Re move 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 8 If you are going to disassemble the display assembly go to section 4 16 ...

Page 145: ...hinge brace at the right side of the computer first then secure the screws at the corners 3 Turn the computer around and secure the two M2 5x6 silver screws on the back figure 4 23 4 Turn the computer again so the front faces you and connect the panel close switch cable to PJ6 on the upper system board then secure it with tape figure 4 21 5 Connect the display cable to PJ3 and the FL cable to PJ2 ...

Page 146: ...0CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack top cover keyboard status indicator panel backup battery microphone and display assembly as described in sections 4 2 through 4 10 3 If you have not already done so turn the computer upside down and remove one M2 5x11 screw next to the battery terminal 4 Remove the left hinge cover and tape then remove the five M2 5x6...

Page 147: ...nect the mouse button s FPC connector from PJ13 and remove the tape figure 26 9 Carefully lift up the upper system board with the power supply board to discon nect two joint connectors PJ11 and PJ12 You may have to pull the computer frame out slightly to clear the DC IN jack figure 26 Figure 4 26 Removing the upper system board 10 Turn the upper system board upside down and remove the power supply...

Page 148: ... Seat the speaker holder in place Fit two pins on the holder into holes in the computer Position the speaker in the holder so that it lies flush with the top of the holder and connect the speaker cable to PJ14 on the upper system board 7 Wrap the speaker cable so that it does not lie on top of sharp projections from the lower board connector and secure it with tape 8 Set the FDD metal cover right ...

Page 149: ...r screw securing the cover figure 4 28 Set the cover aside Figure 4 28 Removing the PCMCIA slot cover 4 Remove one M2 5x6 screw securing the base assembly to the bottom cover and two M2 5x6 screws securing the FDD cover figure 4 29 5 Remove the FDD cover 6 Also lift out the FPC connector to the mouse 7 Press the FDD eject button so that it clears the bottom cover and lift up the front of the base ...

Page 150: ...T4900CT 4 31 Figure 4 29 Removing the base assembly 9 Disconnect the power reset cable from the power reset board figure 4 30 Figure 4 30 Removing the power reset cable ...

Page 151: ...e bottom cover Then make sure the power reset cable extends through the notch on the base assembly and lay the base assembly into the bottom cover Press the FDD eject button so the base assembly can clear the bottom cover figure 4 29 4 Place the mouse s FPC back into the bottom cover and replace the tape figure 4 26 5 Secure the base assembly s front left corner with one M2 5x6 screw figure 4 29 6...

Page 152: ... all external cables connected to the T4900CT 2 Remove the battery pack optional memory card optional PCMCIA card HDD pack top cover keyboard status indicator panel backup battery and microphone display assembly upper system board power supply board and base assembly as described in sections 4 2 through 4 12 3 Disconnect the FDD cable from PJ304 of the lower system board and remove the tape figure...

Page 153: ...r M2 5x2 8 screws shown in figure 4 33 which secure the FDD and pull the FDD out of the base assembly Caution Be careful not to touch the rectangle on the FDD This area is just above the read write head and is very sensitive to damage Figure 4 33 Removing the FDD ...

Page 154: ...asten the two inner screws first then the two outer screws Tighten these screws to a torque of less than 2 2 kgf cm figure 4 33 3 Secure the tape and connect the FDD cable to the pressure plate connector PJ304 on the lower system board figure 4 32 4 Install the base assembly power supply board upper system board display assem bly backup battery and microphone status indicator panel keyboard top co...

Page 155: ...stem board power supply board and base assembly as described in sections 4 2 through 4 12 3 Turn the base assembly upside down 4 Remove the tape and lift up the battery s plastic cover 5 Remove two M2x6 screws securing the PCMCIA slot 2 connector board at the corners Do not remove the two screws at the middle edges of the board figure 4 34 6 Remove two M2 5x4 screws on the edge opposite the PCMCIA...

Page 156: ...T4900CT 4 37 8 Disconnect the RTC battery cable from the PCMCIA slot 2 connector board figure 4 35 Figure 4 35 Disconnecting the RTC battery ...

Page 157: ...rd figure 4 35 2 Seat the PCMCIA slot 2 connector board with the RTC battery attached then connect the two PCMCIA slot 2 connectors to the lower system board figure 4 34 3 Secure the PCMCIA slot 2 connector board with two M2x6 screws then set the RTC battery in place figure 4 34 4 Secure the cover with two M2 5x4 screws figure 4 34 5 Install the base assembly power supply board upper system board ...

Page 158: ...ard HDD pack top cover keyboard status indicator panel backup battery and microphone display assembly upper system board power supply board base assembly and PCMCIA slot 2 board as described in sections 4 2 through 4 12 and 4 14 3 Disconnect the FDD cable from PJ304 of the lower system board if not discon nected earlier 4 Remove three M2 5x6 screws securing the lower system board s metal cover the...

Page 159: ...lower system board and lift it out of the base assembly frame figure 4 37 Figure 4 37 Removing the lower system board 6 Turn the lower system board over and disconnect the sound system board from the lower system board figure 4 38 Figure 4 38 Removing the sound system board ...

Page 160: ...et the lower system board s metal cover in place Be sure the two audio ports extend through the holes in the cover figure 4 36 4 Fasten the three M2 5x6 screws to secure the lower system board s metal cover figure 4 36 5 Connect the FDD cable to PJ304 on the lower system board 6 Install the PCMCIA slot 2 board base assembly power supply board upper system board display assembly backup battery and ...

Page 161: ...two rubber cushions from the top corners of the display to expose two screws securing the display mask 4 Remove the two M2 5x6 screws that were covered by the cushions 5 Carefully insert your fingers between the mask and the LCD panel and pry open the latches Start with the three latches across the top of the display mask 6 Continue unlatching the mask along the sides three latches on each side at...

Page 162: ...tches in the display supports two in the larger support and one in the small support 2 Continue along the bottom of the display two latches along the sides three latches and across the top six latches 3 Secure the cover with two M2 5x6 screws at the top corners 4 Attach the two rubber cushions at each top corner to cover the screws 5 Install the top cover and battery pack as described in sections ...

Page 163: ... external cables connected to the computer 2 Remove the battery pack top cover display mask and the TFT color LCD mod ule as described in 4 2 4 6 4 16 and 4 21 3 Remove the two M2 5x6 screws securing the FL inverter board figure 4 40 Figure 4 40 Removing screws from the FL inverter board 4 Disconnect the FL inverter cable from CN1 and the FL cable from CN2 then lift out the FL inverter board figur...

Page 164: ...igures 4 40 and 4 41 1 Connect the FL inverter cable to CN1 and the FL cable to CN2 on the FL inverter board figure 4 41 2 Replace the FL inverter board and secure it with the two M2 5x6 screws figure 4 40 3 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 ...

Page 165: ...ter power cord and all external cables connected to the T4900CT 2 Remove the battery pack top cover and display mask as described in sections 4 2 4 6 and 4 16 3 Remove four M2 5x6 screws securing the LCD module to the LCD cover 4 Carefully rotate the LCD module from left to right out of the display cover and disconnect the cables from CN11 and CN12 on the LCD module Figure 4 42 Removing the four s...

Page 166: ... LCD module follow the steps below and refer to figure 4 42 1 Connect the display cables to CN11 and CN12 on the LCD module 2 Align the LCD module and then secure it with four M2 5x6 screws 3 Install the battery pack top cover and display mask as described in sections 4 2 4 6 and 4 16 ...

Page 167: ...olor LCD module as described in sections 4 2 4 6 4 16 4 17 and 4 21 3 Place the LCD unit face down and remove two M1 5x5 and one M1 5x2 screws 4 Lift off the FL tube cover 5 Pull up the reflective sheet and lift the FL tube out of the frame Figure 4 43 Removing the FL unit Installing the FL Unit To install the T4900CT s FL unit follow the steps below and refer to figure 4 43 1 Replace the FL tube ...

Page 168: ...ter power cord and all external cables connected to the T4900CT 2 Remove the battery pack top cover display assembly display mask FL inverter board and TFT color LCD module as described in sections 4 2 4 6 4 10 4 16 4 17 and 4 21 3 Remove the three M2 5x6 screws securing the display hinge Note the ground cable 4 Remove the display hinge and the tape then lift off the display cable Figure 4 44 Remo...

Page 169: ... display cable to the display cover and secure the display hinge with two M2 5x6 screws Secure the ground cable to the display cover with one M2 5x6 screw 2 Replace the tape 3 Install the TFT color LCD module FL inverter board display mask display assembly top cover and battery pack as described in sections 4 2 4 6 4 10 4 16 4 17 and 4 21 ...

Page 170: ...er and display assembly as described in sections 4 2 4 6 and 4 10 3 Remove the M2x8 screw securing the panel close switch on the display hinge Figure 4 45 Removing the panel close switch Installing the Panel Close Switch To install the T4900CT s panel close switch follow the steps below and refer to figure 4 45 1 Fit the panel close switch to the display hinge and secure the panel close switch wit...

Page 171: ...stalling 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 2 Be careful to align the holes at the four corners of the LCD module with the corresponding holes in the LCD cover before securing the module with screws Do not force the module into place because stress can affect its performance Also the panel s polarize...

Page 172: ...ommend a CRT cleaning agent Apply the agent to a cloth and then wipe the panel s surface Do not apply cleanser directly to the panel 4 If water or other liquid is left on the panel s surface for a long period it can change the screen s tint or stain it Be sure to quickly wipe off any liquid 5 Glass is used in the panel so be careful not to drop it or let it strike a hard object which could cause b...

Page 173: ...Be sure to wear a wrist or ankle ground when handling the module 7 Do not expose the module to direct sunlight or strong ultraviolet rays for long periods 8 Do not store the module at temperatures below specifications Cold can cause the liquid crystals to freeze lose their elasticity or otherwise suffer damage ...

Page 174: ...D module Disassembly can cause malfunctions 10 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 panel s polarization ...

Page 175: ...T4900CT B 1 Appendix B Board Layout B 1 Upper System Board Figure B 1 Upper system board front ...

Page 176: ...B 2 T4900CT Figure B 2 Upper system board back ...

Page 177: ...or K PJ1 Memory Card Connector L PJ6 LCD Panel Close Switch connector M PJ7 Power Reset Switch Connector N PJ9 Keyboard Connector O PJ13 IPS Switch Connector P PJ14 Speaker Connector Q VR200 CPU Temperature Sensor Table B 2 Upper ICs and connectors on the system board back Mark Number Name A IC5 to IC8 System Memory B IC3 SCPCNT GA C IC4 SISCNT GA D IC21 SLCDC GA E IC23 Keyboard Controller F IC19 ...

Page 178: ...B 4 T4900CT B 2 Lower System Board Figure B 3 Lower system board front ...

Page 179: ...T4900CT B 5 Figure B 4 Lower system board back ...

Page 180: ... Serial Connector G PJ303 PRT Connector H PJ313 PS 2 Keyboard Connector I PJ312 PS 2 Mouse Connector J PJ308 PCMCIA Slot 1 Connector K PJ301 Joint Connector 1 L PJ304 FDD Connector M PJ317 Sound Board Connector N PJ302 Joint Connector 2 Table B 4 Lower ICs and connectors on the system board back Mark Number Name A IC303 SI T6W23 B IC314 PCMCIA Card Controller GA C IC300 BIOS BOM D PJ305 HDD Connec...

Page 181: ...15 B3V 59 MA05 111 O 16 MA04 111 O 60 MA07 111 O 17 NC 61 MA09 111 O 18 MA06 111 O 62 GND 19 MA08 111 O 63 GND 20 MA10 111 O 64 GND 21 GND 65 ERAS1 001 O 22 ERAS0 001 O 66 ECAS2 001 O 23 ECAS0 001 O 67 GND 24 ECAS1 001 O 68 ECAS3 011 O 25 NC 69 ERAS1 001 O 26 ERAS0 001 O 70 EMWE2 001 O 27 B3V 71 NC I O 28 NC I O 72 NC I O 29 NC I O 73 GND 30 NC I O 74 NC I O 31 ECAS0 001 O 75 NC I O 32 ECAS1 001 O...

Page 182: ...in Signal I O Pin Signal I O 01 LCDVCC 21 P2 104 O 02 LCDVCC 22 P21 104 O 03 P4 104 I 23 P1 104 O 04 GND 24 GND 05 PNEL0 100 I 25 P5 104 O 06 P10 104 26 P3 104 O 07 P14 104 O 27 P11 104 O 08 GND 28 GND 09 P8 104 O 29 SHFCLK 104 O 10 GND O 30 P15 104 O 11 P22 104 O 31 ENDATA 104 O 12 GND 32 GND 13 P6 104 O 33 P0 104 O 14 P19 104 O 34 FP 104 O 15 P12 104 O 35 P7 104 O 16 GND 36 GND 17 P9 104 O 37 LP...

Page 183: ...2 B3V 52 DSKDC I 13 PSRWO 000 O 53 GND 14 B3V 54 DSKDC I 15 PSTMG 000 O 55 GND 16 B3V 56 DSKDC I 17 ADPCNT 100 I 57 GND 18 B3V 58 DSPV I 19 GND 59 GND 20 PSUPDT 100 O 60 DSPV I 21 GND 61 GND 22 SUSSTA 001 O 62 P12V 23 GND 63 MCV 24 PSREQ 000 I 64 VCC 25 GND 65 RCLR 100 I 26 N9V 66 VCC 27 GND 67 LOBAT 000 I 28 GND 68 VCC 29 CPUGND O 69 PCLR 000 I 30 GND 70 VCC 31 CPUTMP O 71 BEEP 000 I 32 GND 72 VC...

Page 184: ... SUBBAT 02 GND C 6 PJ6 Panel Close Switch Connector 2 Pin Table C 6 Panel close switch connector pin assignments 2 pin Pin Signal I O Pin Signal I O 01 PNLOFF 000 I 02 GND C 7 PJ7 Power Reset Switch Connector 3 Pin Table C 7 Power Reset switch connector pin assignments 3 pin Pin Signal I O Pin Signal I O 01 RSTSW 010 I 03 PWRSW 010 I 02 GND ...

Page 185: ...7 LSEG10 110 O 15 LSEG02 110 O 08 LSEG09 110 O 16 LSEG01 110 O C 9 PJ9 KB I F Connector 25 Pin Table C 9 KB I F connector pin assignments 25 pin Pin Signal I O Pin Signal I O 01 KBOT00 010 O 14 KBOT06 010 O 02 KBRT6 110 I 15 KBOT08 010 O 03 KBRT0 110 I 16 KBOT02 010 O 04 KBRT2 110 I 17 KBOT07 010 O 05 KBRT3 110 I 18 KBOT09 010 O 06 KBRT1 110 I 19 KBOT10 010 O 07 KBRT7 110 I 20 IPSY 100 I 08 KBRT5 ...

Page 186: ...19 100 I O 21 SA02 100 I O 71 GND 22 SA13 100 I O 72 GND 23 SA01 100 I O 73 24MHZ 100 O 24 SA12 100 I O 74 LA21 100 I O 25 SA00 100 I O 75 CRTEN 000 O 26 BUFOFF 000 I 76 LA23 100 I O 27 DMAENB 100 I 77 OVSYNC 100 O 28 ESMI2 000 I 78 LA22 100 I O 29 DMARD 000 O 79 BLUE 100 O 30 ESMI1 000 I 80 HSYNC 100 O 31 GND 81 LGREN 100 O 32 GND 82 RED 100 O 33 DMAWR 000 O 83 SD00 100 I O 34 IMCS16 000 I 84 SD1...

Page 187: ...40 DACK3 000 I 11 KBOT06 000 I O 41 SPKDRV 000 O 12 GND 42 DACK2 000 I 13 GND 43 SPKVOL 100 O 14 KBOT05 000 I O 44 EPNLOF 000 O 15 KBOT03 000 I O 45 IOWR 000 I O 16 KBOT04 000 I O 46 IORD 000 I O 17 KBOT01 000 I O 47 IMICIN 100 O 18 KBOT02 000 I O 48 GND 19 KBOT00 000 I O 49 SPKM 100 O 20 KEYPRS 100 O 50 N9V 21 KBTMG 100 I 51 AGNDIM O 22 MASTER 000 I 52 BEEP 000 I 23 KBRWO 000 I 53 DSKDC I 24 DACK...

Page 188: ... 01 IMICIN 100 I 03 N C 02 AGNDIM I C 13 PJ13 Switch Board Connector 4 Pin Table C 13 Switch board connector pin assignments 4 pin Pin Signal I O Pin Signal I O 01 GND 03 GND 02 SWL I 04 SWR C 14 PJ14 Speaker Connector 2 Pin Table C 14 Speaker connector pin assignments 2 pin Pin Signal I O Pin Signal I O 01 SPKP 100 O 02 SPKM 100 O ...

Page 189: ...B06 101 I O 21 GND 09 PDB07 101 I O 22 GND 10 ACK 001 I 23 GND 11 BUSY 102 I 24 GND 12 PE 101 I 25 GND 13 SELCT 101 O C 16 PJ304 FDD Connector 26 Pin Table C 16 FDD connector pin assignments 26 pin Pin Signal I O Pin Signal I O 01 ISSEL 000 I 14 GND 02 GND 15 IDIRC 000 O 03 IRDAT 000 I 16 ILOWD 000 O 04 GND 17 IMON 000 O 05 IWPR 000 I 18 IHMED 000 I 06 GND 19 IRDY 000 I 07 ITR0 000 I 20 VCC 08 GND...

Page 190: ...DY I 09 SD05 102 I O 39 GND 10 SD10 102 I O 40 GND 11 GND 41 SA01 100 O 12 GND 42 IRQ14 100 I 13 SD04 102 I O 43 GND 14 SD11 102 I O 44 GND 15 GND 45 SA00 100 O 16 GND 46 SA02 100 O 17 SD03 102 I O 47 GND 18 SD12 102 I O 48 GND 19 GND 49 HDDCS2 010 O 20 GND 50 HDDCS1 010 O 21 SD02 102 I O 51 GND 22 SD13 102 I O 52 HDDVCC 23 GND 53 DRVSL 000 I 24 GND 54 HDDVCC 25 SD01 102 I O 55 HDDVCC 26 SD14 102 ...

Page 191: ...Serial I F Connector 9 Pin Table C 18 Serial I F connector pin assignments 9 pin Pin Signal I O Pin Signal I O 01 DCD1 101 I 06 DSR1 101 I 02 RD1 001 I 07 RTS1 101 O 03 SD1 001 O 08 CTS1 101 I 04 DTR1 101 O 09 RI1 101 I 05 GND ...

Page 192: ...8 101 I O 10 GND 40 SA19 101 I O 11 RVCC 41 SD00 101 I O 12 RGND 42 SD01 101 I O 13 CPCNF 100 I 43 SD02 101 I O 14 MDMSL 001 O 44 SD03 101 I O 15 14R7M 100 O 45 GND 16 MIRQ 001 I 46 SD04 101 I O 17 SPKTON 001 I 47 SD05 101 I O 18 GND 48 SD06 101 I O 19 SA00 101 I O 49 SD07 101 I O 20 SA01 101 I O 50 SMEW 001 O 21 SA02 101 I O 51 SMER 001 O 22 SA03 101 I O 52 GND 23 SA04 101 I O 53 IOWR 001 I O 24 ...

Page 193: ...GND 124 PDB00 100 I O 80 SD13 101 I O 125 PDB01 100 I O 81 SD14 101 I O 126 PDB02 100 I O 82 IRQ6 101 I 127 PDB03 100 I O 83 SD15 101 I O 128 PDB04 100 I O 84 LA22 101 I O 129 PDB05 100 I O 85 LA23 101 I O 130 PDB06 100 I O 86 DRQ2 101 I 131 PDB07 100 I O 87 LA21 101 I O 132 ACK 000 I O 88 LA19 101 I O 133 BUSY 101 I O 89 LA20 101 I O 134 PE 100 I O 90 DACK6 001 O 135 SELCT 100 I O 91 GND 136 AUTF...

Page 194: ...ADA08 100 O 46 CADA17 100 O 13 CADA13 100 O 47 CADA18 100 O 14 CADA14 100 O 48 CADA19 100 O 15 WEA 000 O 49 CADA20 100 O 16 BSYA 000 I 50 CADA21 100 O 17 MCVCCA 51 MCVCCA 18 MCVP1A 52 MCVP2A 19 CADA16 100 O 53 CADA22 100 O 20 CADA15 100 O 54 CADA23 100 O 21 CADA12 100 O 55 CADA24 100 O 22 CADA07 100 O 56 CADA25 100 O 23 CADA06 100 O 57 N C 24 CADA05 100 O 58 CRSTA 100 O 25 CADA04 100 O 59 WAITA 00...

Page 195: ... BVDB2 100 I 05 CADB15 100 O 25 CADB01 100 O 06 CADB23 100 O 26 BVDB1 100 I 07 CADB12 100 O 27 CADB00 100 O 08 CADB24 100 O 28 CDB08 100 I O 09 GND 29 GND 10 GND 30 GND 11 CADB25 100 O 31 CDB00 100 I O 12 CADB07 100 O 32 CDB09 100 I O 13 CADB06 100 O 33 CDB01 100 I O 14 CRSTB 100 O 34 CDB10 100 I O 15 CADB05 100 O 35 CDB2B 000 I 16 CADB04 100 O 36 CDB02 100 I O 17 WAITB 000 I 37 WPB 000 I 18 INPAK...

Page 196: ...CDB12 100 I O 29 CADB18 100 O 10 CDB06 100 I O 30 CADB13 100 O 11 GND 31 GND 12 GND 32 GND 13 CDB13 100 I O 33 CADB19 100 O 14 CDB14 100 I O 34 CADB14 100 O 15 CDB07 100 I O 35 CADB20 100 O 16 CDB15 100 I O 36 WEB 000 I 17 CE1B 100 O 37 CADB21 100 O 18 CADB10 100 O 38 MCVCCB 19 CE2B 000 O 39 BSYB 000 I 20 IORB 000 O 40 MCVCCB C 23 PJ311 CRT I F Connector 15 Pin Table C 23 CRT I F connectors pin as...

Page 197: ...ts 6 pin Pin Signal I O Pin Signal I O 01 EKBDAT 101 I O 04 VCC 02 N C 05 EKBCLK 101 I O 03 GND 06 N C C 26 PJ314 Microphone Jack Connector 6 Pin Table C 26 Microphone jack connector pin assignments 6 pin Pin Signal I O Pin Signal I O 01 AGNDEM I 04 AGNDEM I 02 EMICIN I 05 IMICOF I 03 EMICIN I 06 N C C 27 PJ316 Headphone Jack Connector 6 Pin Table C 27 Headphone jack connector pin assignments 6 pi...

Page 198: ...AK 000 O 05 SD02 100 I O 25 SBEEP 100 O 06 SD03 100 I O 26 IOWR 000 O 07 SD04 100 I O 27 SA00 100 O 08 SD05 100 I O 28 IORD 000 O 09 SD06 100 I O 29 SA01 100 O 10 SD07 100 I O 30 GND 11 VCC 31 GND 12 VCC 32 IMICIN 100 O 13 SPKP 100 I 33 LHPHON 100 I 14 SPKM 100 I 34 AGNDIM O 15 SDEX 000 I 35 RHPHON 100 I 16 SDMUTE 100 O 36 AGNDHP I 17 SDPRDN 000 O 37 SPKOFF 100 O 18 FMCS 000 O 38 EMICIN 100 O 19 A...

Page 199: ...T4900CT D 1 Appendix D USA Display Codes Table D 1 USA display codes ...

Page 200: ...12 _ 0C 8C 4E F0 4E 13 0D 8D 55 F0 55 15 BkSp 0E 8E 66 F0 66 16 Tab 0F 8F 0D F0 0D 17 Q 10 90 15 F0 15 18 W 11 91 1D F0 1D 19 E 12 92 24 F0 24 20 R 13 93 2D F0 2D 21 T 14 94 2C F0 2C 22 Y 15 95 35 F0 35 23 U 16 96 3C F0 3C 2 24 I 17 97 43 F0 43 2 25 O 13 98 44 F0 44 2 26 P 19 99 4D F0 4D 2 27 1A 9A 54 F0 54 28 1B 9B 5B F0 5B 29 42 2B AB 5D F0 5D 5 30 Caps Lock 3A BA 58 F0 58 31 A 1E 9E 1C F0 1C 32...

Page 201: ... B3 41 F0 41 2 54 34 B4 49 F0 49 2 55 35 B5 4A F0 4A 2 57 Shift R 36 B6 59 F0 59 58 Ctrl 1D 9D 14 F0 14 3 60 Alt L 38 B8 11 F0 11 3 61 Space 39 B9 29 F0 29 62 ALT R E0 38 E0 B8 E0 11 E0 F0 11 75 Ins E0 52 E0 D2 E0 70 E0 F0 70 1 76 Del E0 53 E0 D3 E0 71 E0 F0 71 1 79 E0 4B E0 CB E0 6B E0 F0 6B 1 80 Home E0 47 E0 C7 E0 6C E0 F0 6C 1 81 End E0 4F E0 CF E0 69 E0 F0 69 1 83 E0 48 E0 C8 E0 75 E0 F0 75 1...

Page 202: ... F8 42 C2 0A F0 0A 120 F9 43 C3 01 F0 01 121 F10 44 C4 09 F0 09 122 F11 57 D7 78 F0 78 3 123 F12 58 D8 07 F0 07 3 124 PrintSc 6 6 6 6 6 126 Pause 7 7 7 7 7 202 Fn 4 Notes 1 Scan codes differ by mode 2 Scan codes differ by overlay function 3 Combination with Fn key makes different codes 4 Fn key does not generate a code by itself 5 This key corresponds to key No 42 in 102 key model 6 Refer to table...

Page 203: ... table above shows scan codes with the left Shift key In combination with the right Shift key scan codes are changed as below With left Shift With right Shift Set 1 E0 AA E0 B6 E0 2A E0 36 Set 2 E0 F0 12 E0 F0 59 E0 12 E0 59 Table E 3 Scan codes in Numlock mode Cap Key Code set 1 Code set 2 No top Make Break Make Break 75 INS E0 2A E0 52 E0 02 E0 AA E0 12 E0 70 E0 F0 70 E0 F0 12 76 DEL E0 2A E0 53...

Page 204: ... 6C 09 8 8 48 C8 75 F0 75 10 9 9 49 C9 7D F0 7D 11 0 37 B7 7C F0 7C 23 U 4 4B CB 6B F0 6B 24 I 5 4C CC 73 F0 73 25 O 6 4D CD 74 F0 74 26 P 4A CA 7B F0 7B 37 J 1 4F CF 69 F0 69 38 K 2 50 D0 72 F0 72 39 L 3 51 D1 7A F0 7A 40 4E CE 79 F0 79 52 M 0 52 D2 70 F0 70 53 33 B3 41 F0 41 54 53 D3 71 F0 71 55 E0 35 E0 B5 40 4A E0 F0 4A Table E 6 Scan codes with Ctrl key Key Code set 1 Code set 2 top Shift Mak...

Page 205: ...900CT Table E 7 Scan codes with Alt key Key Code set 1 Code set 2 top Shift Make Make Pause Common E1 ID 45 E1 SD C5 E1 14 77 E1 F0 14 F0 77 Ctrl E0 46 E0 C6 E0 7E E0 F0 7E This key generates only make codes ...

Page 206: ...T4900CT F 1 Appendix F Key Layout F 1 United States US Keyboard Figure F 1 US keyboard F 2 United Kingdom UK Keyboard Figure F 2 UK keyboard ...

Page 207: ...F 2 T4900CT F 3 German GR Keyboard Figure F 3 GR keyboard F 4 French FR Keyboard Figure F 4 FR keyboard ...

Page 208: ...T4900CT F 3 F 5 Spanish SP Keyboard Figure F 5 SP keyboard F 6 Italian IT Keyboard Figure F 6 IT keyboard ...

Page 209: ...F 4 T4900CT F 7 Scandinavian SC Keyboard Figure F 7 SC keyboard F 8 Swiss German SL Keyboard Figure F 8 SL keyboard ...

Page 210: ...T4900CT F 5 F 9 Canadian Specialized Keyboard Figure F 9 Canadian keyboard F 10 Keycap Number Keyboard Figure F 10 Keycap number keyboard ...

Page 211: ...D1 17 SLIN 2 PD0 11 BUSY Figure G 1 Printer wraparound connector G 2 RS 232 C Wraparound Connector 3 TD 2 RD 7 RTS 8 CTS 1 CD 4 DTR 6 DSR 9 RI Figure G 2 RS 232 C wraparound connector G 3 RS 232 C Direct Cable 9 Pin to 9 Pin 3 TD 2 RD 4 DTR 6 DSR 8 CTS 9 RI 7 RTS 1 CD 5 GND 5 GND 2 RD 3 TD 1 CD 7 RTS 6 DSR 4 DTR 8 CTS 9 RI Figure G 3 RS 232 C direct cable 9 pin to 9 pin ...

Page 212: ... 2 T4900CT G 4 RS 232 C Direct Cable 9 Pin to 25 Pin 1 CD 4 RTS 2 RD 2 TD 3 TD 3 RD 4 DTR 5 CTS 6 DSR 22 RI 5 GND 7 GND 7 RTS 8 CD 6 DSR 20 DTR 8 CTS 9 RI Figure G 4 RS 232 C direct cable 9 pin to 25 pin ...

Page 213: ... the Password Deletion Disk will not be distributed to ASPs You must obtain the current password from the computer s owner to service the machine If the owner forgets the password the computer must be returned to Toshiba s facility in Irvine California for servicing ...

Page 214: ... Set the system to Boot Mode 2 Turn off the power to the T4900CT 3 Remove the external cable memory card and PCMCIA card 4 Turn on the power while holding down the F12 key Keep holding down the key until the system speaker sounds a beep 5 When the BIOS message is displayed insert the BIOS rewrite disk into the FDD Press the Enter key to start the BIOS rewrite program 6 When the process is complete...

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