Toshiba T-Series T1200 User manual

1.1 GENERAL
Toshiba Personal Computer T1200 (hereinafter referred to as
T1200) is a portable personal computer which is compatible with
IBM PC situated at higher rank of portable computer than Toshiba
TllOO PLUS. It provides many powerful functions in spite of its
compact size and internal battery pack which is removal.
Hardware of the T1200, most of IC chips are C-MOS type so that
the power consumption is very little and Gate Array chips are
applied so that it is very compact and light weight.
The Tl200 is composed of as follows:
System PCB (Printed curcuit board)
3.5-inch floppy disk drive
3.5-inch hard disk drive
LCD (Liquid crystal display)
Keyboard
Intelligent power supply PCB
Built-in modem
FIGURE 1-1 T1200 Personal Computer
1-1

A 3.5-inch Floppy disk drive (FOO) is double-sided,
double-density, double-track with storage capacity of 720
kilobytes (formatted). A 3.5-inch hard disk drive (HOD) with
storage capacity of 20 megabytes is an equipment of the former.
The high-resolution liquid crystal display (LCD) with pixels of
640 in columns and 200 in rows.
The keyboard has 82 keys. For most applications it can be used
exactly like a standard typewriter keyboard.
Intelligent power supply apart from those ordinary power serving
functions, this unit contains a so-called "one-chip
microcomputer", and it controls the whole system PCB, FOO, HOD
and HOC.
The built-in modem expands the capabilities of your system. The
built-in modem enables the system to communicate with an
asynchronous communications device through a telephone line. The
modem can operate communications at either low (300 bps) or high
(1200 bps) speed.
The T1200 provided connecting to the optional devices at the
rear panel of the system. There are six connectors such as a
parallel printer, an RGB direct drive CRT display, an external
FOO, an external key pad and an RS-232C device.
1-2

1.2 SYSTEM PCB
System PCB is composed of the following devices:
o Central processor: CPU (80C86-2) (9.54 MHz/4.77 MHz)
o Numeric data processor: NPU (8087, optional)
o Memory
System memory
Expanded memory
BIOS ROM
Video RAM
640 kbytes
384 kbytes
32 kbytes
16 kbytes
o System support elements
Direct memory access: DMA (82C37)
Timer : (82C53)
Programmable interrupt controller: PIC (82C59)
o Floppy disk controller: FDC (8565)
o Keyboard controller: KBC (80C49)
o Acynchronous communication element: ACE (8570)
o Gate array
Bus driver
Bus controller
EXP-MEM controller
Display controller
1-3

1.2.1 Jumper straps
The system PCB has five jumper straps~ PJ17, PJ18, PJ19, PJ20,
and PJ2l.
The following figure shows location of the jumper straps.
I PJ21
PJ18 PJ19
--
PJ20
I11III
PJ17
-
FIGURE 1-2 Jumper Straps Location
1-4

The following table shows function of the jumper straps.
TABLE 1-1 Jumper Strap Functions
Jumper Pins Description
D
F/F type
PJ17
1 2
F/H type
PJ18
D 3 Normal.
PJ18 PJ19 1 2
PJ19
PJ18
1 G When connect an
ICE to the co-processor socket.
PJ19D
D Noco-processor.
PJ20
1 2 When connect a co-processor
to the co-
processor socket.
D Display a normal
font.
PJ21
1 2 Displays a North Europian (Denmark) font.
1-5

1.3 3.5-rRCB PLOPPY DISK DRIVE
The floppy disk drive (FDD) used in the T1200 is high
performance, high reliable, slim sized FDD for 3.5-inch floppy
disks with recording capacity of 1 Mbyte (unformatted) in
double-sided, double density and 135 tracks per inch operation.
The specifications are as following table.
FIGURE 1-3 3.5-inch FDD
T~BLE 1-2 3.5-inch Floppy Disk Drive Specifications
Item Specifications
Storage Capacity (kilobytes)
1000 (unformatted)
720 (formatted)
Number of Heads 2
Number of Track perSide
80
Track to Track Access (milliseconds) 6
Head Settling Time (milliseconds) 1S
Track Density (tracks persecond) 135
Motor Start-up Time (milliseconds)
500
Data Transfer Rate (kilobits per second) 250
Rotational Speed (revolutions per minute)
300
Recording Method
MFM (Modified frequency
modulation)
1-6

1.4 HARD DISK DRIVE
The hard disk drive (HDD) is random access storage, having
recording capacity of 20 Mbytes. This is equipped with the
storage media of non-removable 3.S-inch magnetic disks and
mini-winchester type magnetic heads.
The specifications are as following table.
FIGURE 1-4 3.5-inch Hard Disk Drive
TABLE 1-3 3.5-inch Hard Disk Drive Specifications
Item Specifications
Storage Capacity (megabytes) 25.3
(unformatted)
21.4 (formatted)
Number of Heads 2
Number
of Track perSide 615
Access Time (milliseconds) (minimum) 24
(average) 78
(maximum) 130
Data Transfer Rate (megabits per second) 7.5
Rotational Speed (revolutions per minute) 2597
Recording
Method
2-7 RLL (Run length limited)
1-7

1.5 BARD DISK COR~OL PCB
Hard disk control PCB (HOC) is accompanied by hard disk drive
(HOD) and connects to the system PCB through a cable. This HOC
can interface the HOD to the system PCB.
The specifications are as following table.
FIGURE 1-5 Hard Disk Control PCB
TABLE 1-4 Hard Disk Control PCB Specifications
Item
Specifications
Encoding method 2-7 RLL (Run Length Limited)
Data Transfer Rate (megabits per second) maximum
7.S
Write Precompensation time (nanoseconds) 12
Sectorina Soft
1-8

1.6 KEYBOARD
The keyboard is mounted on the system and has 82 keys. These
consist of 48 standard keys, 10 function keys, 10 cursor keys,
13 functional keypads, and Fn key.
The keyboard is just a key matrix built up by the above keys.
The keyboard is connected to the keyboard controller on the
system PCB through a 22-pin flat cable.
FIGURE 1-6 Keyboard
1-9

1.7 LIQUID CRYS~AL DISPLAY
The liquid crystal display (LCD) is a graphics type display unit
which has a resolution of 640 in horizontal (or column) by 200
in vertical (or row) directions. This unit is composed of the
display panel, power supply and driver circuits. This receives
timing pulses, four-bit data signals, +5V dc and -22V dc power
inputs and a contrast control input from the system PCB. All
timing pulses and data signals are TTL level compatible.
Specifications are as following table.
FIGURE 1-7 Liquid Crystal Display
TABLE 1-5 Liquid Crystal Display Spesifications
Item Specification
Outline Dimension (mm) 275.0 (W) x 126.0 (H) x 15.8(D)
Number
of Dots 640 x 200
dots
Number of characters 80 x 25 (2000) Characters
(8 x 8
dot format, alpha-numeric)
Clear Viewing Area (mm) 231.0 (W) x 105.0 (H)
Dot Size (mm) 0.32 (W) ,0.46 (H)
Dot Pitch (mm) 0.35 (W)
,0.49 (H)
Weight (gram) Max.
500
1-10

1. 8Pt:MBk SUPPLY PCB
The power supply PCB supplies de 5, 12, -22, and -9 volts to all
the components in the system.
It is an intellegent power supply using a I-chip micro-computer
and it contains the following functions.
Control and monitoring of the stored main battery. This performs
recharge control, detection of the available capacity, and that
of the low battery.
1. Monitering of AC adapter
2. Monitering of DC output voltage
3. Power on/off control of the system unit
4. Self-diagnosis of the power supply
5. Pays a role of interface with the CPU
Communication control
Reset signal generation
Low-battery signal generation
6. Display control
AC adapter connection
Battery recharge
Abnormal power supply
Output rating is as following table.
FIGURE 1-8 Power Suplly PCB
TABLE 1-6 Power Supply PCB Output Rating
FUNCTION DC VOLTAGE REGULATION
TOLERANCE
(%)
SYSTEM LOGIC, FDD MOTOR
5 5
HOC, HOD (LOGIC) 5 5
HOD (MOTOR) 5 10
CMOS, DRAM,
V-RAM, B-RAM 5 5
RS-232C, I/O SLOT
12
5
HOD 12 5
LCD
-22 5
RS-232C BUILT IN MODEM OR I/O SLOT -9 15
1-11
MAX.
CURRENT
0.7A
O.3A
1.3A
80mA
30mA
lOrnA
lOrnA
30mA

1. 9 BOILT- IR MOD!II
The built-in modem is connected to the connector that is used
exclusively for this system PCB. Note that the system PCB is
originally provided with this modem. This modem can operate in
only one communication mode, the BELL 103/212 communication.
T~e specifications are as following table.
FIGURE 1-9 Built-in Modem
TABLE 1-7 Built-in Modem Specifications
Item Specification
Data Format
Low Speed (300
BPS)
7 or 8 bits, 1 or 2stop bits odd,
even or no parity.
High Speed (1200
BPS) 7 bits, no parity, 2stop bits
7 bits,
e/o parity, 1stop bit
8 bits, no parity, 1stop bit
Dialing Capability Tone
Diall Pulse Dial
Audio Monitor Speaker
Receive Sensitivity -4SdBm
1-12

1.9.1 Jumper straps
The built-in modem has four jumper straps; PJ3, PJ4, PJ5 and
PJ6.
The following table shows functions of the jumper straps.
TABLE 1-8 Jumper Straps Functions
Jumper Pins Description
D 3 Always set
joining pins 1and 2.
PJ3
,..--..,
For adjustment when Modem card is shipped.
1 12 3 1
L. __ ..I Never
use these pins.
D 3 Alwaysset
joining pins 1and 2.
PJ4
r--..,
For adjustment when Modem card is shipped.
1 12 3 1
L. __ ..I Never
use these pi ns.
Joining pins 1and 2 is the same as setting a
D 3 Smartmodem 1200's
configuration switch 1 UP.
This is the setting required for most
applications. This setting enables data terminal
PJS
ready (DTR).
r--.,
Joining pins 2 and 3 is the same as setting a
1 12 3 1 Smartmodem 1200's
configuration switch 1
1..--..1
DOWN. This setting sets DTR alwayus TRUE.
Joining pins 1and 2 is the same as setting a
D Smartmodem 1200's
configuration switch 6 UP.
3 This setting enables
the computer to determine
if a carrier signal is coming from a distant
modem.
PJ6
Joining pins 2 and 3 is the same as setting a
,..--..,
Smartmodem 1200's configuration switch 6
1 12 3 1 DOWN. This setting means carrier
detect is
L. __ ..I always
TRU Eeven if there's no carrier coming
from the remote system.
1-13

2.1 GBRBRAL
These problem isolation procedures are used to isolate defective
FRUs (field replaceable units) to be replaced. FRUs consist of
the following:
1. Power supply PCB
2. System PCB
3. FDD
4 • HDD and HOC
5. Keyboard
6. LCD
See PART 4 for detailed replacement procedures instructions.
Test program operations.are described in PART 3.
The following items are necessary for carrying out the problem
isolation procedures.
1. T1200 Diagnostics disk
2. Flatbladed screwdriver
3. Work disk (for FDD testing)
4. Cleaning disk kit (for FDD testing)
5. Multimeter
6. Printer port LED
The problem isolation flowchart described in part 2.2 can be
used to determine the necessary isolation procedures to be
followed when there is a problem with the T1200.
2.2 PROBLEM ISOLA"l'IOR ~BAR-r
This flowchart is used as a guide for determining which FRU is
defective. Please confirm the following before performing the
flowchart procedures.
1. No disk is in the FDD.
2. The HDD switch is off.
3. The ac adapter is disconnected.
4. All optional equipment is disconnected.
See next· page.
2-1

Turn the POWER switch off.
Perform power supply problem
:>..:.;N.;:.o_.lholat1on procedures
in part 2.3.
Yes Perfor. system PCB problem
=>----! .. , isolation procedures in part 2.4.
No Perform LCD problem isolation
~ __ ~ procedures 1n part 2.7.
Perform syste. PCB proble.
~..:.;No~_,holat1on procedures in part 2.4.
Perform system
PCB proble.
~_N_o_~, holat1on procedures in part 2.4.
FIGURE 2-1 Problem Isolation Flowchart
2-2

Insert the diagnostics disk into the FOO
and press any key.
No Perform FOO problem isolation
=>'-;;"--!~Iprocedures in part 2.5.
After confirming
which diagnostic
test caused an error to be
">---i~lgenerated. Perform the relevant
Yes
problem isolation procedures. as
indicated below.
1. If an error is generated on the system test, memory test,
display test and real time test, go to system PCB isolation
procedures in part 2.4.
2. If an error is generated on the keyboard test, go to
keyboard isolation procedures in part 2.8.
3. If an error is generated on the floppy disk test, go to FDD
isolation procedures in part 2.5.
2-3

2.3 POWBR SUPPLY PCB lSOLA1'IOR PROCEDURBS
This section describes how to determine whether the power supply
PCB is defective or not. The procedures below are outlined in
the following pages. They should be performed in the order
indicated.
PROCEDURE 1: Battery Check
PROCEDURE 2: Power Supply Indicator Check
PROCEDURE 3: Connector Check
PROCEDURE 4: Output Voltage Check
PROCEDURE 5: Power Supply PCB Replacement
2-4

PROCEDURE 1
Battery Check
1. Turn the POWER switch off.
2. Disconnect the ac adapter.
3. Turn the POWER switch on. If the Low Battery indicator
lights, plug the ac adapter into the DC IN l2V jack. If the
indicator then goes out, the battery is normal and you
should go to PROCEDURE 3; if it remains lit, go to PROCEDURE
2.
FIGURE 2-2 Battery Check
2-5

PROCBDURB 2
Power Supply Indicator Check
1. Turn the POWER switch on.
2. Plug the ac adapter into an electrical outlet and the DC IN
l2V jack.
3. If the Power Supply indicator lights, its meaning depends on
its color and whether it blinks or not, as described below.
RED/CONTINUOUSLY LIT: Current is flowing; the ac adapter is
normal.
GREEN/CONTINUOUSLY LIT: Either the main
disconnected, or current flow has stopped
complete); the ac adapter is normal.
battery
(charging
is
is
RED/BLINKING: Current is not being supplied by the ac
adapter; the adapter must be replaced. If the indicator
still blinks after replacing the ac adapter, replace the
power supply PCB. (See part 4.8)
4. If the indicator does not light the ac adapter must be
replaced.
POWER SUPPLY INDICATOR
FIGURE 2-3 Power Supply Indicator
2-6

PROCEDURE 3
Connector Check
1. Turn the POWER switch off and disconnect the ac adapter.
7. Remove the top cover assembly. (Refer to part 4.2.)
3. If the three power supply PCB connectors (PJ 2, 3, and 4)
and the two system PCB connectors (PJ 9 and 12) are
connected properly, go to PROCEDURE 4: if they are not
connected properly, reconnect them.
FIGURE 2-4 Power Supply and System PCB Connectors
2-7