Toshiba T-Series T2000sxe User manual

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Part 1
HardwareOverview

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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

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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
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
Item2-Mbytemode1-Mbytemode
Storagecapacity(Kbyte)
Unformatted
Formatted2,000
1,440 1,000 720
Numberofheads2 2
Numberofcylinders80 80
Access time(ms)
Tracktotrack
Average
Headsettling time
3
94
15
3
94
15
Recording trackdensity(tpi)135 135
Datatransferrate(Kbps)500 250
Rotation speed(rpm)300 300
Recording method MFM(modifiedfrequencymodulation)

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1.4 2.5-inch Hard Disk Drive
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
Item40-Mbyte60-Mbyte
CP-2044 JD-E2850PCP-2064
Storagecapacity
Formatted(Mbytes)42.6 42.52 64.0
Numberofdisks222
Dataheads434
Datasurfaces434
Trackspersurface 552 791(+2)823
Tracksperdrive2,208 2,373(+6)1,306
Sectorspertrack 38(+1)35(+1)38(+1)
Bytespersector512 512 512
Access time(ms)
Tracktotrack
Average
Maximum
5
19
40
9
25
47
5
19
40
Rotation speed(rpm)3,486 3,109 3,444
Datatransferrate
To/frommedia(bps)12 M10 M12 M
Interleave1:1 1:1 1:1
Recording method 2-7RLL/
1-7RLL
2-7RLL 2-7RLL/
1-7RLL

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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.
Figure 1-6 T2000SXe keyboard

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1.6 Sidelit Liquid Crystal Display
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.
Figure 1-7 Sidelit LCD
Table 1-3 Sidelit LCD specifications
ItemSpecifications
Numberofdots(dots)640x480
Dotdimension (mm)0.24(W)x0.24(H)
Dotpitch(mm)0.27(W)x0.27(H)
Displayarea (mm)183.0(W)x136.0(H)
Contrast15:1(typ.)
FLcurrent(mA)4.0-6.0
FLfrequency(KHz)35-43

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(2) Fluorescent Lamp inverter board
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
ItemSpecifications
InputVoltage(V)12-24
Power(W)3.6(Max.)
OutputVoltage(V)800 (min.) Current(mA)5.5
Frequency(KHz)39
Boundsofcurrent(mA)3.25-5.5

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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 con-
firm 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 problemisolation procedures
turned on? in Section 2.3.
Yes
Is an error message Yes Perform the system board
displayed? problemisolationprocedures
in Section 2.4.
No
IstheXXXK Base Memory, No Perform the display
XXXXXK Extended message problemisolation procedures
displayed ? in Section 2.8.
Yes
DoestheXXXK Base Memory, Perform the system board
XXXXK Extended message No problemisolation 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
1Figure 2-1 Problem isolation flowchart