Toshiba T2000SXe User Manual
Part 1
Hardware Overview
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Contents
1.1 General ....................................................................................................................... 1-5
1.2 System Unit ................................................................................................................ 1-7
1.3 3.5-inch Floppy Disk Drive....................................................................................... 1-10
1.4 2.5-inch Hard Disk Drive .......................................................................................... 1-11
1.5 Keyboard .................................................................................................................. 1-12
1.6 Sidelit Liquid Crystal Display ................................................................................... 1-13
Tables
Table 1-1 T2000SXe 3.5-inch FDD specifications......................................................... 1-10
Table 1-2 T2000SXe 2.5-inch HDD specifications ........................................................ 1-11
Table 1-3 Sidelit LCD specifications ............................................................................. 1-13
Table 1-4 FL inverter specifications .............................................................................. 1-14
Figures
Figure 1-1 T2000SXe personal computer.......................................................................... 1-6
Figure 1-2 T2000SXe system unit configuration .............................................................. 1-6
Figure 1-3 T2000SXe block diagram ................................................................................ 1-7
Figure 1-4 T2000SXe 3.5-inch FDD ............................................................................... 1-10
Figure 1-5 T2000SXe 2.5-inch HDD............................................................................... 1-11
Figure 1-6 T2000SXe keyboard ...................................................................................... 1-12
Figure 1-7 Sidelit LCD ................................................................................................... 1-13
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1.1 General
The Toshiba T2000SXe is one of the lightest and most advanced portable computers available
offering high technology, high speed, excellent legibility, IBM PC/AT compatibility, and battery
operation.
The T2000SXe is one of a new class of portables called notebook computers, the lightest portable
computers available.
The T2000SXe system unit has the following features:
❑ The Central Processing Unit (CPU) is an 80386SX-20 32-bit microprocessor, operating at
20MHz.
❑ The standard Random Access Memory (RAM) capacity is 2MB. With 2MB, 4MB, or 8MB
expansion memory cards, the T2000SXe system can have a maximum of 10MB of RAM.
❑ An 80387SX-20 Numeric Data Processor (NDP) can be installed.
❑ The Liquid Crystal Display (LCD) supports 640x480 pixels with Video Graphics Array
(VGA) compatibility and 16 levels of gray.
❑ The display controller supports VGA functions through the High Resolution Graphics
Subsystem (HRGS).
❑ The 3.5-inch Floppy Disk Drive (FDD) supports two memory formats:
• 1.44MB double-sided, high-density, double-track (2HD)
• 720KB double-sided, double-density, double-track (2DD)
❑ The 2.5-inch Hard Disk Drive (HDD) has either a 40MB or 60MB capacity.
❑ The keyboard is an 86/88-key keyboard that is fully compatible with the IBM standard 101/
102-key keyboard.
❑ The universal auto-sensing AC adapter can be used in a range from 100 to 240 volts AC.
❑ A built-in modem slot is available for an optional built-in modem.
❑ A parallel port, serial port, RGB port, numeric keypad port, and expansion bus connector
are provided to allow the T2000SXe to interface with a variety of optional equipment.
❑ The T2000SXe supports the Toshiba AutoResume feature, storing the data and configura-
tion information when the power is turned off.
❑ The Real Time Clock (RTC) continuously stores the date and time even when the power is
turned off.
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The T2000SXe Personal Computer is shown in Figure 1-1 and the T2000SXe system configuration
is shown in Figure 1-2.
Figure 1-1 T2000SXe personal computer
Figure 1-2 T2000SXe system unit configuration
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1.2 System Unit
Figure 1-3 shows the block diagram of the T2000SXe’s system unit.
Figure 1-3 T2000SXe block diagram
1-7
The system board in the T2000SXe is composed of the following major components:
❑ Central Processing Unit (CPU): 80386SX-20
The CPU is a 32-bit microprocessor operating at 20MHz (fast mode) and 10MHz (slow
mode) clock speeds.
❑ Numeric Data Processor (NDP) socket for the 80387SX-20 (optional)
❑ Super Integration (SI): T9778A
The SI stores the following components:
· Two Direct Memory Access Controllers (DMACs): 82C37A
· Two Programmable Interrupt Controllers (PICs): 82C59A
· One Programmable Interval Timer (PIT): 82C54
· One Floppy Disk Controller (FDC): TC8565
· One Serial Input/Output Controller (SIO): TC8570
❑ Variable Frequency Oscillator (VFO): TC8568AM
The VFO chip is used for Floppy Disk Drive control logic.
❑ Real Time Clock (RTC): 146818AF
The RTC chip stores the date, time, and system configuration with power supplied from the
RTC battery.
❑ Keyboard Interface Controller (KBIC): 80C42
❑ Keyboard Scan Controller (KBSC): 80C50
❑ Power Supply Controller (PSC): U47C440
❑ Memory:
Standard RAM: 2MB
Backup RAM: 32KB
BIOS ROM: 128KB (96KB are used)
BIOS ROM also contains the Initial Reliability Test (IRT), the system’s Basic Input/
Output System (BIOS), and the video BIOS.
Video RAM: 256KB
Optional memory cards:
The system can have up to 10MB of RAM by installing an optional memory card.
❑ Gate arrays:
System control gate array: GA-SCNT2 (208-pin)
I/O control gate array: GA-IO CNT (176-pin)
VGA display controller: PVGA1F (132-pin)
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❑ Oscillators (OSC):
14.7456MHz OSC (X1) is used for the SIO.
14.31818MHz OSC (X2) is used for the KBC.
44.9MHz OSC (X3), 28.322MHz OSC (X5), and 25.175MHz OSC (X6) are used for the
video.
40.0MHz OSC (X4) is used for the CPU.
24MHz OSC (X7) is used for the VFO.
32.768KHz OSC (X8) is used for the RTC.
500KHz OSC (X701) is used for the PSC.
See Appendix A for the location of the OSCs.
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1.3 3.5-inch Floppy Disk Drive
Recording method M FM (modified frequency modulation)
The T2000SXe 3.5-inch Floppy Disk Drive (FDD) supports 720KB (formatted) 2DD and 1.44MB
(formatted) 2HD 3.5-inch floppy disks.
The T2000SXe FDD is shown in Figure 1-4 and its specifications are described in Table 1-1.
Figure 1-4 T2000SXe 3.5-inch FDD
Table 1-1 T2000SXe 3.5-inch FDD specifications
Ite m 2-Mbyte mode 1-Mbyte mode
Storage capacity (Kbyte)
Unformatted
Formatte d
Number of heads 2 2
Number of cylinders 80 80
Access time (ms)
Track to trac k
Average
Head settling time
Recording trac k density (tpi) 135 135
Data transfer rate (Kbps) 500 250
Rotation speed (rpm) 300 300
2,000
1,440
3
94
15
1,000
720
3
94
15
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1.4 2.5-inch Hard Disk Drive
1-7 RLL
1-7 RLL
The 40MB or 60MB (formatted) Hard Disk Drive (HDD) is a random access storage device. It is
equipped with a non-removal 2.5-inch magnetic disk and mini-Winchester type magnetic heads.
The T2000SXe HDD is shown in Figure 1-5. The HDD specifications are described in Table 1-2.
Figure 1-5 T2000SXe 2.5-inch HDD
Table 1-2 T2000SXe 2.5-inch HDD specifications
It em
Sto rage capacity
Form atted (Mbytes)
Num ber of disks 2 2 2
Data heads 4 3 4
Data su rfaces 4 3 4
Tr acks per surface 55 2 791 (+2) 8 23
Tr acks per drive 2,208 2,373 (+6) 1,306
Sector s per track 38( +1) 35(+1) 38(+1)
Bytes per sector 51 2 51 2 51 2
Access time (ms)
T rack to track
Average
M aximum
Rotation speed (rpm) 3,486 3,109 3,444
Data transfer rate
To/from m edia (bps)
Interleav e 1:1 1:1 1:1
Recor ding m ethod 2-7 RLL/
CP- 2044 JD-E 2850P CP-2064
40- Mbyte 60- Mbyte
42.6 42.52 64.0
5
19
40
12 M 10 M 12 M
9
25
47
2-7 RLL 2-7 RLL/
5
19
40
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1.5 Keyboard
The 86-key (USA) or 88-key (European) keyboard is mounted on the system unit. The keyboard is
connected to the keyboard controller on the system board through 8-pin and 12-pin flat cables. The
keyboard is shown in Figure 1-6.
See Appendix E for optional keyboard configurations.
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Figure 1-6 T2000SXe keyboard
1.6 Sidelit Liquid Crystal Display
FL frequency (KHz) 35-43
The sidelit Liquid Crystal Display (LCD) is composed of an LCD module, a Fluorescent Lamp
(FL), and FL inverter board.
(1) LCD module
The T2000SXe sidelit LCD is illuminated from the side and supports 640x480 pixels with a High
Resolution Graphics Subsystem (HRGS) and 16 levels of gray. The HRGS includes the functions
of the Video Graphics Array (VGA).
The LCD receives vertical and horizontal synchronizing signals, 8-bit data signals (4-bit upper data
signal, 4-bit lower data signal), and shift clock for data transmission. All signals are CMOS-level
compatible.
The sidelit LCD is shown in Figure 1-7 and its specifications are described in Table 1-3.
Table 1-3 Sidelit LCD specifications
Item Specifications
Numbe r of dots (dots) 640x480
Dot dimens ion (mm) 0.24(W)x0.24(H)
Dot pitch (mm) 0.27(W)x0.27(H)
Display area (mm) 183.0(W)x136.0(H)
Contrast 15:1 (typ.)
FL c urrent (mA) 4.0-6.0
Figure 1-7 Sidelit LCD
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(2) Fluorescent Lamp inverter board
Bounds of curre nt (mA) 3.25-5.5
The FL inverter board supplies the high frequency current needed to illuminate the FL.
The specifications for the FL inverter are described in Table 1-4.
Table 1-4 FL inverter specifications
Ite m Specifications
Input Voltage (V) 12-24
Power (W) 3.6 (Max.)
Voltage (V) 800 (min.)
Output
Current (mA) 5.5
Frequenc y (KHz) 39
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Part 2
Problem Isolation Procedures
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Contents
2.1 General ....................................................................................................................... 2-5
2.2 Problem Isolation Flowchart....................................................................................... 2-6
2.3 Power Supply Problem Isolation Procedures............................................................... 2-8
2.4 System Board Problem Isolation Procedures ............................................................ 2-14
2.5 Floppy Disk Drive Problem Isolation Procedures ..................................................... 2-20
2.6 Hard Disk Drive Problem Isolation Procedures......................................................... 2-25
2.7 Keyboard Problem Isolation Procedures ................................................................... 2-30
2.8 Display Problem Isolation Procedures ...................................................................... 2-33
Tables
Table 2-1 Power supply error status .............................................................................. 2-10
Table 2-2 Normal status and error status of the printer port LED .................................. 2-17
Table 2-3 FDD error code and status ............................................................................. 2-23
Table 2-4 HDD error code and status............................................................................. 2-28
Figures
Figure 2-1 Problem isolation flowchart ............................................................................ 2-6
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2.1 General
This part describes how to determine which Field Replaceable Unit (FRU) is causing the
T2000SXe to operate abnormally.
The FRUs covered are:
❑ Power supply unit
❑ System board (PCB FT3SYx)
❑ FDD
❑ HDD
❑ Keyboard
❑ Display
The Diagnostics Disk operations are described in Part 3 and detailed replacement procedures are
given in Part 4.
The following items are necessary for implementing the problem isolation procedures.
❑ T2000SXe Diagnostics Disk
❑ Phillips head screwdrivers (2mm, 3mm)
❑ Toshiba MS-DOS system disk
❑ 2DD or 2HD formatted work disk (for FDD testing)
❑ Cleaning disk kit (for FDD testing)
❑ Printer port LED
❑ RS-232-C wraparound connector
❑ Printer wraparound connector
❑ Multimeter
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2.2 Problem Isolation Flowchart
The flowchart in Figure 2-1 is used as a guide for determining which FRU is causing the T2000SXe
to operate abnormally. Before performing the procedures described in the flowchart, please confirm the following:
❑ Disconnect all optional equipment from the T2000SXe.
❑ Remove any diskette in the FDD.
START
Insert the Toshiba MS-DOS
system disk into the FDD.
Turn the POWER switch on.
Wait 5 seconds or more.
Does the power indicator No Perform the power supply
come on when the power is problem isolation procedures
turned on? in Section 2.3.
Yes
Is an error message Yes Perform the system board
displayed? problem isolation procedures
in Section 2.4.
No
Is the XXXK Base Memory, No Perform the display
XXXXXK Extended message problem isolation procedures
displayed ? in Section 2.8.
Yes
Does the XXXK Base Memory, Perform the system board
XXXXK Extended message No problem isolation procedures
proceed from Base Memory = in Section 2.4.
64KB and Extended = 0KB to
Base Memory = 640KB and
Extended = (amount of extended
memory)?
Yes
Is Toshiba MS-DOS No Perform the FDD problem
being loaded? isolation procedures in
Section 2.5.
Yes
1
Figure 2-1 Problem isolation flowchart
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1
Do typed characters No Perform the keyboard problem
appear correctly? isolation procedures in
Section 2.7.
Yes
Insert the Diagnostics Disk
into the FDD. Then type
A:TESTCE20 and
press Enter.
Perform each test.
After confirming which diagnostic
test detected an error, perform the
Is an error detected in Yes relevant problem isolation
the diagnostics program? procedures as indicated below.
No
System is normal.
END
Figure 2-1 Problem isolation flowchart (continued)
If the diagnostics program does not detect any errors, the problem may be intermittent. The running test should be executed several times to isolate the problem.
After confirming which diagnostic test detected an error(s), refer to the appropriate section as
follows:
❑ 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 problem isolation procedures in Section
2.4.
❑ If an error is detected on the keyboard test, perform the keyboard problem isolation proce-
dures in Section 2.7.
❑ If an error is detected on the floppy disk test, perform the FDD problem isolation proce-
dures in Section 2.5.
❑ If an error is detected on the hard disk test, perform the HDD problem isolation procedures
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in Section 2.6.
2.3 Power Supply Problem Isolation
Procedures
This section describes how to determine if the power supply is causing the T2000SXe to operate
abnormally. Start with Procedure 1 and continue with the other procedures as instructed. The
procedures described in this section are:
Procedure 1: DC IN Indicator Check
Procedure 2: Connector and Cable Check
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UPDATE
Procedure 3: Replacement Check
Procedure 1
DC IN Indicator Check
1. When the T2000SXe AC adapter is connected to a live wall outlet and the T2000SXe, the
DC IN indicator will light red. If the AC adapter or the power supply is malfunctioning,
the DC IN indicator will flash red or does not light at all.
(1) If the DC IN indicator flashes red, refer to Check 1.
(2) If the DC IN indicator does not light, refer to Check 2.
Check 1 When a power supply problem occurs, the DC IN indicator will flash repeatedly
with a 4-bit status that varies depending on the problem.
The DC IN indicator is off for two seconds and then it lights for either ½ second
(indicating a binary 0) or one full second (indicating a binary 1). There is a ½second interval between bits, with bit 0 (zero) or the least significant bit first and
ending with bit 3 (three) or the most significant bit.
For example, the following timing chart shows a status of 5h (0101). The timing
chart below is read from right to left.
Bit 0 Bit 1 Bit 2 Bit 3
1 0 1 0
ON
DC IN
OFF
2s 1s 0.5s 1s 0.5s
0.5s 0.5s 0.5s
Time
➝
The status and its meaning are described in Table 2-1.
However, when the DC IN indicator blinks at random, the AC adapter or charging
circuit may be damaged. In this case, replace the AC adapter with a new one. If the
2-9
problem still exists, perform Procedure 3.
current of charging current.
Table 2-1 Power supply error status
Status Meaning
1h Over voltage of AC ada pter output voltage. (More than
+18V±5%)
2h Abnorma l temperature in the system. (Less than -20°C or
more than 70°C.)
3h Abnormal charging. (The system cannot stop charging.)
4h Over current of charging current.
5h Abnormal charging voltage.
6h Abnorma l battery voltage.
7h Abnormal VCC (+ 5) voltage.
8h Abnormal R AMV (+5V for DRAM) voltage.
9h VEE (-9V) is shorted.
Ah VDD (+12V) is shorted.
Bh VDSP (+12V to +18V for FL) is shorted
Ch Turned off the Desk Station II before turning off the
T2000SXe.
Dh Battery terminal is shorted.
Eh Under voltage of A C adapter output voltage. (Less than
+18V±5%)
Fh Under
Check 2 When the DC IN indicator does not light, one or all of the following could be the
cause:
1. The AC adapter is damaged. Replace the AC adapter.
2. Fuse (F701) on the system board is bad. Replace the fuse.
3. The charge/+18V switching signal is not sent correctly. Replace the AC
adapter.
4. The AC adapter detecting circuit is damaged. Replace the AC adapter.
2-10
If the DC IN indicator problem still exists, perform Procedure 3.
2. The indicator labeled Battery lights yellow (while the system is charging the battery) or
lights green (when the battery pack is fully charged) if power is supplied from the AC
adapter when you connect the battery pack to the system and the system is off.
NOTE: The system automatically stops charging the battery when the battery pack
overheats.
If only the battery pack is connected to the system, this indicator does not light (indicating
the battery pack is in use, or the battery pack is not in use when the AC adapter is connected) or blinks red (indicating the battery is low). If the battery pack is completely
discharged, this indicator does not light.
(1) If the battery indicator blinks or does not glow when you connect the AC adapter to
the system and the system is off, see Check 3.
(2) If the battery indicator blinks when you disconnect the AC adapter from the system,
see Check 6.
NOTE: If both (1) and (2) above occur, check the power output circuits to the system.
Check 3 Make sure the battery pack is correctly connected to the system. If the problem still
exists, perform Check 4.
Check 4 Connect the AC adapter to the system and wait 30 minutes or so. If the problem still
exists, perform Check 5.
Check 5 Replace the battery pack with a recharged battery pack. If the problem still exists,
perform Procedure 2. Also, check the battery charge circuits.
Check 6 Make sure the battery pack is correctly connected to the system. If the problem still
exists, perform Check 7.
Check 7 Replace the battery pack with a known good one. If the problem still exists, perform
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Procedure 2.
Procedure 2
Connector and Cable Check
The battery pack is connected to the system board with the battery cable. The cable may be disconnected or damaged. Refer to Part 4 for instructions on how to disassemble the T2000SXe and then
perform the following checks.
Check 1 Make sure the battery terminal cable is connected to the system board at PJ702.
Terminal System board PJ702
If this cable is disconnected, connect it and restart the system. If the problem still
exists, refer to Check 2.
Check 2 Recheck the cable using a multimeter. If the cable looks damaged, replace the
terminal assembly and restart the system. If the problem still exists, refer to Proce-
2-12
dure 3.
Procedure 3
Replacement Check
In the T2000SXe, the system board is connected with the power supply circuits. The LED board
(PCB FT2LEx) is connected with the indicator circuits. Either of these boards may be damaged.
Refer to Part 4 for instructions on how to disassemble the T2000SXe, and then perform the following checks.
Check 1 Replace the LED board with a new one and restart the system. If the problem still
exists, perform Check 2.
Check 2 Replace the system board with a new one. If the problem still exists, other units
2-13
may be damaged.
2.4 System Board Problem Isolation
Procedures
This section describes how to determine if the system board is causing the T2000SXe to operate
abnormally. Start with Procedure 1 and continue with the other procedures as instructed. The
procedures described in this section are:
Procedure 1: Message and Beep Sound Check
Procedure 2: Printer Port LED Check
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Procedure 3: Test Program Check
Procedure 1
Message and Beep Sound Check
After the power is turned on, the system performs the Initial Reliability Test (IRT) which is stored
in the BIOS ROM on the system board. The IRT tests and initializes each IC on the system board.
If an error message appears on the screen, refer to Check 1. If nothing is displayed on the screen,
refer to Procedure 2.
Check 1 If the following error message appears on the screen briefly, the PRT/FDD port is
assigned as FDD-A and an external FDD is not attached to the PRT/FDD port.
Assign the PRT/FDD port as FDD-B or Printer using the Setup program, or
attach an external FDD. Then reboot the system.
*** FDD A is not installed ***
If another error message appears, perform Check 2.
Check 2 If the following error message appears on the screen, press the F1 key. Then ex-
ecute the setup operation. Detailed setup operation procedures are described in Part
3.
This program confirms the current T2000SXe system configuration and the configuration stored in RTC memory. If they are different, the following message will
appear.
*** Error in CMOS. Bad battery ***
Check system. Then press [F1] key.
*** Error in CMOS. Bad check sum ***
Check system. Then press [F1] key.
*** Error in CMOS. Bad memory configuration ***
Check system. Then press [F1] key.
*** Error in CMOS. Bad time function ***
Check system. Then press [F1] key.
2-15
If another error message appears, refer to Check 3.
Check 3 If the following message appears, and the status of the printer port LED is F4h to
F6h, replace the system board. Otherwise, press any key. At this time the resumed
data will be erased.
WARNING: RESUME FAILURE.
PRESS ANY KEY TO CONTINUE.
WARNING: DATA IN HARD RAM WAS LOST
YOU MUST FORMAT HARD RAM BEFORE USE
PRESS ANY KEY TO CONTINUE
If another error message appears, refer to Check 4.
Check 4 The IRT program tests the system board. If an error occurs in the IRT program, the
error message appears on the screen and beep sounds are generated.
If the following message appears, replace the system board. Otherwise, refer to
Check 5.
ERROR INTERRUPT CONTROLLER #1
ERROR INTERRUPT CONTROLLER #2
MEMORY VERIFY ERROR AT xxxx:xxxx FOUND xxxx
EXPECTED xxxx
ERROR INTERRUPTS AND STUCK NMI
ERROR PROTECT MODE
ERROR PROCESSOR EXCEPTIONAL INTERRUPTS
Check 5 If the following message is displayed on the screen, refer to the Hard Disk Drive
Problem Isolation Procedures in Section 2.6.
If the following error message does not appear and the beep sounds do not occur,
refer to Procedure 2.
ERROR ENCOUNTERED INITIALIZING HARD DISK DRIVE
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