Toshiba Tl000LE User manual

1.1 GENERAL
The Toshiba Tl000LE is one of the lightest portable computers available offering high
technology,highspeed,excellentlegibility,IBM
PC/XTcompatibility,andbatteryoperation.
The
Tl000LE is so small it defines a new class of portables called notebook computers.
The
Tl000LE uses the MS-DOS version 3.30 operating system and contains a powerful
80C86-2 microprocessorwith a 16-bitdata width on the data bus line. The standardrandom
access memory (RAM) capacity is I-Mbyte with the ability to insert
1-,2-,4- or 8-Mbyte
memory cards; thus, the system can have up to 9 Mbytes
of RAM.
The TlOooLE system unit consists
of the following features:
• System board/memory board
• 3.5-inch floppy disk drive (FDD) that supports two memory formats:
1.44-Mbyte double-sided, high-density, double-track (2HD)
720-Kbyte double-sided, double-density, double-track (2DD)
• 2.5-inch hard disk drive (HDD) with 20-Mbyte capacity
• IBM enhanced keyboard compatibility
• Sidelit liquid crystal display (LCD)
• Power supply system consisting of an AC adapter and batteries
TheLCD supports640x400pixelswithcolor/graphicsadapter(CGA) compatibilityandtwo
color attribute combinations.
Connecting ports for optional equipment are provided on the rear panel of the system. A
parallel port, serial port, and expansion bus connector are all provided for.
Figure
1-1 TlOOOLE system unit
1-3

1.2 SYSTEM UNIT
Figure 1-2 shows the T1000LE's system block diagram.
Optional
CPU
Intelligent
DC IN
RAM r--
80C86-2 power supply
<
1/2/4/8MB
OSC
Standard
500KHz
RAM
I---
DC
1MB
(+5,+12,-9,-22V)
Speaker
OSC
I---
Memory and bus
W
19.09MHz
controller G.A.
~
(SlECP3-GA) KBC
80C49
2.5" HDD
r-1
LCD
I
I/O controller
-
CG-ROM
G .A.
128KB
Backup (SlEI01-GA)
~
RAM
16KB V-RAM
OSC
32KB
17.5MHz
OSC
RTC
PRT/FDD J
32.7KHz
BIOS ROM
SI
-1
3.5"
FDD
48KB
'---
PIT
-1 VFO
t-
FDC OSC
DMAC
24MHz
PIC
UART
-1
COMMS
I
Expansion
OSC
bus connector 14.75MHz
Figure 1-2 Block Diagram
1-4

The system board in the TlOOOLE is composed of the following major components:
• Central processing unit: CPU (80C86-2)
The CPU is a 16-bit microprocessor operating at 9.54MHz
or 4.77MHz clock speed.
• Super integration: SI (T9776)
The SI stores the following components:
Direct Memory Access controller:
Programmable interrupt controller:
Programmable interval timer:
Floppy disk controller:
Universal asynchronousreceiver
and transmitter:
• Variable frequency oscillator: VFO (TC8568)
The VFO chip is used for FDD control logic.
• Real time clock: RTC (TC8521)
DMAC (TMP82C37
A)
PIC (TMP82C59A)
PIT (TMP82C53)
FDC (TC8565)
SIO (TC8570)
The RTC has memory in the chip which keeps the date, time,
and system configuration with an RTC battery.
• Keyboard controller: KBC (TMP80C49)
• Memories:
Standard RAM:
Backup RAM:
BIOS ROM:
Video RAM:
CGROM:
• Gate arrays:
I Mbyte
16 Kbytes
48 Kbytes
32 Kbytes
128 Kbytes
Memory and bus controller gate array:
I/O controller gate array: SIECP3-GA (184-pin)
S lEIOI-GA (184-pin)
1-5

1-6
• Oscillators: OSC
32.768KHz OSC (Xl) is used for the RTC.
19.0909lMHz OSC (X2) is used for the CPU.
l4.7456MHz OSC (X3) is used for the SIO.
24MHz OSC (X4) is used for the VFO.
l7.5MHz OSC (X5) is used for the LCD.
500KHz OSC (X50l) is used for the CPU of the intelligent power supply.
The location of these OSCs are shown in Appendix A.

1.3 3.5-INCH FLOPPY DISK
DRIVE
The 3.5-inch floppy disk drive (FDD) is a high perionnance, reliable, and thin drive that
supports 720-Kbyte (fonnatted) 2DD and 1.44-Mbyte(fonnatted) 3.5-inchfloppy diskettes.
The FDD is shown in Figure 1-3 and its specifications are described in Table 1-1.
Figure 1-3 3.5-inch FDD
Table
1-1 3.5-inch FDD specifications
Item Specifications
2-Mbyte
mode
1-Mbyte
mode
Storage capacity
(Kbyte)
Unformatted
2,000 1,000
Formatted
1,440 720
Number of heads
2 2
Number of cylinders 80 80
Access time
(ms)
Track to track 3 3
Average
181
181
Head settling time 15 15
Rotation speed
(rpm)
360
360
Data transfer rate
(Kbps)
500
300
Recording method MFM (modified
frequency
modulation)
Recording track density
(bpi)
135
135
Recording density
(bpi) 17,430
8720
1-7

1.4 2.S-INCH HARD DISK
DRIVE
The 20-Mbyte (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 HDD is shown in Figure 1-4 and its specifications are described in Table 1-2.
Figure 1-4 2.5-inch HDD
Table 1-2 2.5-inch HDD specifications
Item
JDE2825P
CP2024
Storage capacity (Mbytes)
Formatted
21.4
21.4
Number of disks
1 1
Data surfaces
2 2
Data heads
2 2
Track per surface
581
653
Track density
(tpi) 1,465 1,700
Sectors per track
36
33
Access time
(ms)
Track to track
8 5
Average
25 25
Maximum
45 40
Rotation speed
(rpm) 3,109 3,433
Data transfer rate
(bps)
To/from media
10 M 10 M
Interleave
1:1 1:1
Recording method
2-7 RLL
code
(Run length limited)
Recording
density
(ID) I
(bpi) 39,665
34,816
1-8

1.5 KEYBOARD
The 82- (USA) or 84- (European) keyboard is mounted on the systemunit. The keyboard is
connected to the keyboard controller on the system board through a 20-pin flat cable. The
keyboard is shown in Figure 1-5.
Optional keyboard configurations are illustrated in Appendix E.
Figure 1-5 Keyboard
1-9

1.6 SIDELIT LIQUID CRYSTAL
DISPLAY
The sidelit liquid crystal display (LCD) is composed of an LCD module, fluorescent lamp
(FL),
and FL inverter. The sidelit LCD is illuminated from the side. Thus, you can read its
cleardisplay
even in poorly litconditions. Itreceives vertical and horizontal synchronizing
signals, 8-bit data signals (4-bit upperdata signal, 4-bit lower data signal), and shiftclock for
data transmission. All signals are TTL-level compatible. The specifications are described
in
Table 1-3.
The sidelit LCD has two color attribute combinations and the display quality can be adjusted
by the contrast and brightness controls.
A high frequency current is supplied by the FL inverter to illuminated the FL.
The sidelit LCD is shown in Figure 1-6.
Figure 1-6 Sidelit
LCD
Table 1-3 Sidelit LCD specifications
Item Specifications
Number of dots
(dots)
640
x 400
Dot dimension
(rnm)
0.27(W)
x 0.27(H)
Dot pitch
(rnm)
0.30(W)
x 0.30(H)
Display area
(rnm)
202.0(W)
x 128.0(H)
Contrast 1 : 4 (Min. )
FL current
(rnA)
7.0
- 7.8
FL frequency (KHz)
25
- 45
1-10

2.1 GENERAL
The problem isolation procedures described in Part 2 are used to isolate defective field
replaceable units (FRUs). The FRUs covered are:
1.
Power supply unit
2. System board
3.
FDD
4. HDD
5.
Keyboard
6.
Display
Test program operations are described in Part 3 and detailed replacement procedures are
described in Part
4.
The following items are necessary for implementing the problem isolation procedures:
1. T1000LE Diagnostics Disk
2. Phillips head screwdriver
3. Work disk (for FDD testing)
4. Cleaning disk kit (for FDD testing)
5. Printer port LED
6. RS-232-C, printer wraparound connectors
7. Multimeter
The problem isolation flowchart described in Section 2.2 can be used to determine which
isolation procedures are necessary to isolate a
TlOOOLE problem.
2-3

2-4
2.2 PROBLEM ISOLATION
FLOWCHART
TheflowchartinFigure2-1 isusedasaguidefor determiningwhichFRUisdefective. Please
confIrm the following before performing the flowchart procedures.
1. Disconnect all optional equipment.
2. Remove any disk in the FDD.