Toshiba T-Series T3200 User manual

1.1 GENERAL
Toshiba Personal Computer T3200 (hereinafter referred to as
T3200) is a portable personal computer which is compatible with
IBM PC/AT si tuated at higher rank of portable computer than
Toshiba T3l00. Hardware of the T3200, a lot 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 T3200 is composed of as follows:
System PCB (Printed curcuit board)
Hard disk control PCB
3.5-inch floppy disk drive
3.5-inch hard disk drive
Plasma display
Keyboard
Power supply unit
FIGURE 1-1 T3200 Personal Computer
1-1

A 3.5-inch Floppy disk drive (FDD) is double-sided,
double-density, double-track with storage capacity of 720
kilobytes (formatted). A 3.5-inch hard disk drive (HDD) with
storage capacity of 40 megabytes (formatted) is the second
external storage device. The plasma display with pixels of 720
in columns and 400 in rows.
The keyboard has 85 keys. For most applications it can be used
exactly like a standard typewriter keyboard.
The power supply unit provides +5 Vdc and +12 Vdc power to every
component in the system unit, including the option cards. For
the plasma display, this unit regulates +205 Vdc power. This
unit has a ventilation fan, driven by +12 Vdc. The fan enhances
the reliability and durability of the T3200 system unit.
The T3200 provided connecting to the optional devices at the
rear panel of the system. There are three connectors such as a
parallel printer (or an external floppy disk drive), an RGB
direct drive CRT display and an RS-232C device.
The connector for a parallel printer can be used to connect an
external FDD unit by changing the A-B-PRT switch setting.
1-2

1.2 SYSTEM PCB
System PCB is composed of the following devices:
o Central processor: CPU (80286-12) (12 MHz/6 MHz»
o Numeric data processor: NPU (80287, optional)
o Memory
RAM
ROM (Main BIOS) .... .
(AGS BIOS) ..... .
Video RAM ..........•
1 Mbyte standard
3 Mbytes (option card)
--- "LIM" standard
64 Kbytes (16 bits)
32 Kbytes (8 bits)
256 Kbytes
o System suP?ort elements
Direct memory access: DMA (82C37)
Programmable interrupt controller: PIC (82C59)
Programmable interval timer: PIT (82C54)
Real time clock: RTC (MC1468l8)
o Floppy disk controller: FDC (TC8565F)
o Keyboard controller: KBC (u8042) x 2
o
Display controller: PEGA2, AGS G.A.
o Gate array
Bus driver
Memory mapper
DMA driver
I/O controller
LIM
AGS (Advanced graphics subsystem)
1-3

1.2.1 DIP switches
The system has DIP switches which are located at the rear panel.
The following table shows function of the DIP switches.
TABLE 1-1 DIP Switch Functions
DIP
Setting Description
Switch
ON Auto-Switched display mode
1
OFF
IBM EGA full compatible
ON
PRT port used both for input and output
2
OFF
PRT port only for output
ON
Communications port as CH2
3
OFF
Communications port as CH 1
ON Double font in plasma for TEXT
4
OFF Single font in plasma for TEXT
ON Disable CRTC for EXT.CRTC
5
OFF Enable internal CRTC (normal)
ON North European Font to display
6
OFF Other Fonts (Normal)
7to 10
(Defined as follows)
Monitor in use 7 8 9 10
Monochrome OFF OFF OFF OFF
Standard RGB
(40 column mode is default)
ON OFF
OFF ON
Standard RGB
(80 column mode is default)
OFF OFF OFF ON
Enhanced RGB
(200 line or emulation of standard RGB is
ON ON ON
OFF
default)
Enhanced RGB
(350 line, true enhanced operation is default)
OFF ON ON
OFF
1-4

1.2.2 Jumper straps
The system has six jumper straps (PJ 2) which are located on the
keyboard control PCB.
Usually the six jumper straps are all open.
The following figure shows location of the jumper straps.
MiwtfU PJ 2
I I
FIGURE 1-2 Jumper Strap Locations
The following table shows function of the jumper straps.
TABLE 1-2 Jumper Strap Functions
Name Function
1-2
Not used
3-4 2HD
FDD type Open ... 1.6 Mbytes
Short ... 2.0 Mbytes
5-6
Internal FDD numbers
Open ...
OneFDD
Short ...
Two FDD/s
7-8
FDD type Open ... 2DD
Short ... 2HD (1.6 Mbytes/2.0 Mbytes)
9-10 Standard
memory size Open ... 640 kbytes
Short ... 512 kbytes
11-12 Used
3M B memory card Open ... Used
as the extended memory and
mode (Option) the expanded memory.
Short ... Used as the only expanded
memory.
1-5

1.3 3.5-INCB FLOPPY DISK DRIVE
The floppy disk drive (FDD) used in the T3200 is high
performance, high reliable, slim sized FDD for 3.5-inch floppy
disks with recording capacity of 720 kbytes (formatted) in
double-sided, double density and 135 tracks per inch operation.
The specifications are as following table.
FIGURE 1-3 3.5-inch FDD
TABLE 1-3 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) 3
Head Settling Time (milliseconds)
15
Track Density (tracks per inch)
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 3.5-IRCH HARD DISK DRIVE
The hard disk drive (HDD) is random access storage, having
recording capacity of 40 Mbytes (formatted). This is equipped
with the storage media of non-removable 3.5-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 1-4 3.5-inch Hard Disk Drive Specifications
Item Specifications
Storage Capacity (megabytes) 51.24
(unformatted)
40.30 (formatted)
Number of Heads 8
Number of Cylinders 615
Number
of Tracks (tracks per cylinder) 8
Access Time (milliseconds)
(minimum)
8
(average) 38
(maximum) 85
Recording Density (bits per inch) 14845
Track Density (tracks per inch) 834
Rotational Speed (revolutions per minute)
3600
Recording Method
MFM (Modefied Frequency
Modulation)
1-7

1.5 HARD DISK CONTROL 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 HDD to the system PCB.
The specifications are as following table.
FIGURE 1-5 Hard Disk Control PCB
TABLE 1-5 Hard Disk Control PCB Specifications
Item Specifications
Encoding method
MFM (Modefied Frequency
Modulation)
Data Transfer Rate (megabits per second) maximum
5
Write Precompensation time (nanoseconds)
12
Sectoring
Soft
1-8

1.5.1 Jumper straps
The Hard disk control PCB has jumper straps which are PJ 3, PJ 4
and PJ 5.
Functions of the jumper straps are as follows.
(1) PJ 3
Not used.
(2) PJ 4
This jumper straps select recording method of the hard
disk control PCB.
The following table shows function.
TABLE 1-6 PJ 4 Jumper Strap Functions
No. Status Function
1-2 Short
MFM method
3-4 Open
( 3) PJ 5
This jumper straps select the delay time of the hard
disk control PCB.
Usually delay time is selected as 20 ns.
The following table shows function of the jumper
straps.
TABLE 1-7 PJ 5 Jumper Strap Functions
No. Delay
time select
1-2 10
ns
3-4
15 ns
5-6
20 ns
7-8 25
ns
9-10
30 ns
1-9

1 .6 KEYBOARD
The keyboard is mounted on the system and has 85 keys. These
consist of 54 standard keys, 10 function keys, 17 cursor keys,
14 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
1-10

1. 7 PLASMA DISPLAY
The plasma display is a graphics type display unit composed of
the display panel and driver circui ts. This receives vertical
and horizontal sync signals, four bit data signals, and shift
clock for data transmission. All these signals are TTL level
compatible. The specifications are as following table.
The plasma display has 4-level of gray display.
The plasma display be adjusted by contrast/brightness control
volume.
FIGURE 1-7 Plasma Display
TABLE 1-8 Plasma Display Specifications
Item Specification
Dot Number (dots) 720 x 400
Dot Dimension (mm) 0.18 (V) x 0.16 (H)
Dot Pitch (mm) 0.36 (V) x 0.30 (H)
Display Area (mm) 144(V)x216(H)
Contrast 1 : 10
Color Neon -
orange
Power Requirement + 5V ±0.5V, 0.6A
+205 ±5V, 170mA
+ SV ± O.SV, 60mA
MTBF 20000 hours
1-11

1.8 POWER SUPPLY UNIT
The power supply unit supplies dc 5, 12, -12 and 205 volts to
all the components in the system.
The power supply unit is housed in the system and is designed to
support the following:
1) System PCB
2) 3.5-inch Floppy disk drive
3) 3.5-inch Hard disk drive
4) Hard disk control PCB
5) Keyboard unit
6) Plasma display
7) Option PCB's
The power supply unit includes the input line filter, line fuse,
cooling fan, power conversion circuitry and connectors.
Input rating is as follows.
AC 100, 115/220, 240 Volts, 60W (lOOW max.)
Output rating is as following table.
FIGURE 1-8 Power Supply Unit
TABLE 1-9 Power Supply Unit Output Rating
DC VOLTAGE REGULATION
MAX.
FUNCTION TOLERANCE CURRENT
SYSTEM PCB
5V
:t5% 6.5A
SYSTEM PCB
12 V
±5% 2.6A
SYSTEM PCB
-12 V + 10 %, -20 % 0.3A
PLASMA DISPLAY 205 V 200 to 210 V 170mA
PLASMA DISPLAY
SV ±10%
60mA
1-12

2.1 GENERAL
These problem isolation procedures are used to isolate defective
FRUs (field replaceable units) to be replaced. FRUs consist of
the following:
1. Power supply unit
2. System PCB
3. FDD
4 . HDD and HOC
5. Keyboard
6. Plasma display
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. T3200 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 T3200.
2.2 PROBLEM ISOLATION FLOWCHART
This flowchart is used as a guide for determining which FRU is
defecti ve. Please conf irm the following before performing the
flowchart procedures.
1. No disk is in the FDD.
2. All optional equipment is disconnected.
See next page.
2-1

Turn the POWER switch off.
Is the C> displayed
on the screen ?
Perform power supply problem
">-;,.;.No"-- ___ I isolation procedures in part 2.3.
Yes Perform system PCB problem
=>-----l.1 isolation procedures in part 2.4.
No Perform Plasma Display problem
~ __ .I isolation procedures in part 2.8.
No Perform system PCB problem
:>-.:..;.::....---1.1 isolation procedures in part 2.4.
No Perform HOD problem isolation
~":':'="'---l.1 procedures 1n part 2.4.
FIGURE 2-1 Problem Isolation Flowchart
2-2

Insert the diagnostics disk into the FDD.
System normal
Perform FDD problem isolation
~_N...,;.o_ ... ,procedures in part 2.5.
After confirming which diagnostic
test caused an error to be
--:>-----l., generated. Perform the re1evant
Yes
problem isolation procedures, as
indicated below.
1. If an error is generated on the system test, memory test,
display test and real timer test, go to system PCB isolation
procedures in part 2.4.
2. If an error is generated on the hard disk test, go to HDD
isolation procedures in part 2.6.
3. If an error is generated on the keyboard test, go to
keyboard isolation procedures in part 2.8.
4. If an error is generated on the floppy disk test, go to FDD
isolation procedures in part 2.5.
2-3

2.3 POWER SUPPLY UNIT ISOLATION PROCEDURES
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: Power Indicator Check
PROCEDURE 2: Connector Check
PROCEDURE 3: Output Voltage Check
PROCEDURE 4: Power Supply Unit Voltage Adjustment
PROCEDURE 5: Power Supply Unit Replacement
2-4

PROCEDURE 1
Power Indicator Check
1. Turn the POWER switch on.
2. If the POWER indicator lights, go to PROCEDURE 3.
If the indicator doesn't light, replace the ac cord; if it
lights, the previous ac cord was defective. If the indicator
doesn't light yet, go to PROCEDURE 2.
Disk in Use
DO 0 DOD
Left Right CRT Caps Num Scroll
Lock Lock Lock
FIGURE 2-2 POWER Indicator Check
2-5

PROCEDURE 2
Connector Check
1. Turn the POWER switch off and unplug the ac cord.
2. Remove the top cover.
(Refer to part 4.2.)
3. If the two system PCB connectors (PJ 7 and 8) are connected
properly, go to PROCEDURE 3; if they are not connected
properly, reconnect them.
FIGURE 2-3 Power Supply Unit Connectors
2-6

PROCEDURE 3
Output Voltage Check
1. Disconnect the three power cables (for plasma display and
system PCB) from the system PCB.
2. Plug the ac cord, then turn the POWER switch on.
3. Use a multimeter to confirm that the output voltages for the
three power supply PCB connectors conform to the values
given in the following table.
4. If the voltages conform to the values given in the table,
the power supply PCB is normal. System PCB is probably
defecti ve, go to system PCB isolation procedures in part
2.4.
5. If the voltages do not conform to those given in the table,
ao to PROCEDURE 4.
TABLE 2-1 Power Supply Unit Output Voltages
PIN NUMBER VOLTAGE (Vdc)
CONNECTOR +
lead
-lead
Normal Min Max
PJ 003 1 3,4
+ 5 + 4.75 + 5.25
2
3,4
+ 5 + 4.75 + 5.25
PJ 004 1 2,4
+ 12 + 11.4 + 12.6
3
2,4 -12 -13.2 -9.6
PJ 005 1 2 + 205 + 200 + 210
3 2 + 5 + 4.5 + 5.5
2-7

PROCEDURE 4
Power Supply Unit Voltage Adjustment
1. Turn the POWER switch off and unplug the ac cord.
2. Remove the power supply unit. (Refer to part 4.9.)
3. Remove the power supply uni t cover from the power supply
unit.
4. Set the dummy load resister (1.3 kiloohm, 35 W) to the
plasma display power connector (l-pin to 2-pin).
5. Plug the ac cord to the power supply uni t, then turn the
POWER switch on.
6. Use a multimeter to confirm that the output voltages for the
plasma display power connector conform to the volues given
in the following table.
TABLE 2-2 VRl Adjustment
PIN NUMBER VOLTAGE (Vdc)
CONNECTOR +
lead
-lead Min Max
PJ 005 1 2 + 201 + 202
7. If the voltage does not conform to that given in the table,
after turn the VR2 to the right, then adjust the VRl on the
power supply PCB by Phillips screwdriver.
8. Turn the POWER switch off, then remove the dummy load
resister (1.3 kiloohm, 35 W).
9. Set the dummy load resister (21 kiloohm, 2.5 W) to the
prasma display power connector (l-pin to 2-pin).
10. Adjust the VR2 on the systen PCB that the output voltages
for the plasma display power connector conform to the values
given in the following table.
TABLE 2-3 VR2 Adjustment
CONNECTOR
PIN NUMBER VOLTAGE (Vdc)
+ lead -lead
Min
Max
PJ 005
1 2 +
208
+ 209
2-8