Toshiba T-Series T2000 User manual

1-1
Part 1
HardwareOverview

1-2
This page intentionally left blank

1-3
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 T2000 3.5-inch FDD specifications ............................................................... 1-10
Table 1-2 T2000 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 T2000 personal computer ................................................................................ 1-6
Figure 1-2 T2000 system unit configuration ..................................................................... 1-6
Figure 1-3 T2000 block diagram....................................................................................... 1-7
Figure 1-4 T2000 3.5-inch FDD...................................................................................... 1-10
Figure 1-5 T2000 2.5-inch HDD ..................................................................................... 1-11
Figure 1-6 T2000 keyboard............................................................................................. 1-12
Figure 1-7 Sidelit LCD ................................................................................................... 1-13

1-4
This page intentionally left blank

1-5
1.1 General
The Toshiba T2000 is one of the lightest and most advanced portable computers available offering
advanced computer technology, high speed, excellent legibility, IBM PC/AT compatibility, and
battery operation.
The T2000 is one of a new class of portables called notebook computers, the lightest portable
computers available.
The T2000 system unit has the following features:
❑The Central Processing Unit (CPU) is an 80C286-12 16-bit microprocessor, operating at
12MHz (fast mode) and 6MHz (slow mode).
❑The standard Random Access Memory (RAM) capacity is 1MB. With 1MB, 2MB, 4MB, or
8MB expansion memory cards, the T2000 system can have a maximum of 9MB of RAM.
❑An 80C287-12 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 20MB or 40MB 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
allow the T2000 to interface with a variety of optional equipment.
❑The T2000 supports the Toshiba AutoResume feature, storing the data and configuration
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.

1-6
The T2000 Personal Computer is shown in Figure 1-1 and the T2000 system configuration is shown
in Figure 1-2.
Figure 1-1 T2000 personal computer
Figure 1-2 T2000 system unit configuration

1-7
1.2 System Unit
Figure 1-3 shows the block diagram of the T2000’s system unit.
Figure 1-3 T2000 block diagram

1-8
The system board in the T2000 is composed of the following major components:
❑Central Processing Unit (CPU): 80C286-12
❑Numeric Data Processor (NDP) socket for the 80C287-12 (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 (146818AF) stores the date, time, and system configuration.
❑Keyboard Interface Controller (KBIC): 80C42
❑Keyboard Scan Controller (KBSC): 80C50
❑Power Supply Controller (PSC): U47C440
❑Memory:
Standard RAM: 1MB
Optional RAM: 1MB, 2MB, 4MB, or 8MB
Backup RAM: 32KB
BIOS ROM: 128KB (96KB are used)
BIOS ROM also contains the Initial Reliability Test (IRT), the T2000’s system
Basic Input/Output System (BIOS), and the video BIOS.
Video RAM: 256KB
❑Gate arrays:
System control gate array: GA-SYS CNT (208-pin)
I/O control gate array: GA-IO CNT (100-pin)
I/O decoder gate array: GA-IO DEC (100-pin)
Refresh control gate array: GA-RFE (44-pin)
VGA display controller: PVGA1F (132-pin)

1-9
❑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.
24.0MHz 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.

1-10
1.3 3.5-inch Floppy Disk Drive
The T2000 3.5-inch Floppy Disk Drive (FDD) supports 720KB (formatted) 2DD and 1.44MB
(formatted) 2HD 3.5-inch floppy disks.
The T2000 FDD is shown in Figure 1-4 and its specifications are described in Table 1-1.
Figure 1-4 T2000 3.5-inch FDD
Table 1-1 T2000 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)

1-11
1.4 2.5-inch Hard Disk Drive
The 20MB or 40MB (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 two HDDs manufactured for the T2000 are shown in Figure 1-5. Their specifications are
described in Table 1-2.
JVC Conner
Figure 1-5 T2000 2.5-inch HDD
Table 1-2 T2000 2.5-inch HDD specifications
Item20-Mbyte40-Mbyte
JD-E2825PCP-2024 CP-2044 JD-E2850P
Storagecapacity
Formatted(Mbytes)20.4 21.4 42.5 42.52
Numberofdisks1 1 2 2
Dataheads2 2 4 3
Datasurfaces2 2 4 3
Trackspersurface 581 653 552 791(+2)
Tracksperdrive1,162 1,306 2,208 2,373(+6)
Sectorspertrack 36 32(+1)38(+1)35(+1)
Bytespersector512 512 512 512
Access time(ms)
Tracktotrack
Average
Maximum
9
25
47
5
23
40
5
19
40
9
25
47
Rotation speed(rpm)3,109 3,444 3,486 3,109
Datatransferrate
To/frommedia(bps)10M10M12M10M
Interleave1:1 1:1 1:1 1:1
Recording method 2-7RLL 2-7RLL 2-7RLL/
1-7RLL
2-7RLL

1-12
1.5 Keyboard
The 86-key (USA) or 88-key (European) keyboard is mounted on the T2000 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 T2000 keyboard

1-13
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 T2000 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

1-14
(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

2-1
Part 2
Problem Isolation Procedures

2-2
This page intentionally left blank

2-3
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 descriptions................................................................... 2-28
Figures
Figure 2-1 Problem isolation flowchart ............................................................................ 2-6

2-4
This page intentionally left blank

2-5
2.1 General
This part describes how to determine which Field Replaceable Unit (FRU) is causing the T2000 to
operate abnormally.
The FRUs covered are:
❑Power supply unit
❑System board (PCB FA2SYx)
❑FDD
❑HDD
❑Keyboard
❑Display
The following items are necessary for implementing the problem isolation procedures.
❑T2000 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

2-6
2.2 Problem Isolation Flowchart
The flowchart in Figure 2-1 is used as a guide for determining which FRU is causing the T2000 to
operate abnormally. Before performing the procedures described in the flowchart, please confirm
the following:
❑Disconnect all optional equipment from the T2000.
❑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? problemisolation procedures
in Section 2.4.
No
IstheMEMORY TEST No Perform the display
XXXXKB message problemisolation procedures
displayed ? in Section 2.8.
Yes
DoestheMEMORY TEST Perform the system board
XXXXKB message No problemisolation procedures
proceed from 64KB in Section 2.4.
to XXXXKB ? 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