Panasonic JB-3300 Quick start guide

Technical Guide
Portable Computer
JB-3300
ae . e .
Panasonic
Matsushita
Electric
Trading
Co.,
Ltd

PREFACE
This Technical Guide contains a detailed explanation of the operation of the CPU
module, the floppy disk controller, display/keyboard, disk drives, and power
supplies for the computer. General checkout procedures to aid you in tracing
problems to a specific subassembly or PC board but no further are included.
Information on the hard disk controller board, floppy disk drive, and hard disk
drive is also provided. In addition, you will find data sheets for several of
the integrated-circuit chips used in this computer.
This guide limits repair procedures to replacement of subassemblies only. A
parts list containing part numbers for major subassemblies may be found in
Section 1, item 8. Additionally, a detailed parts list for each subassembly
may be found at the end of each section. Using the part numbers, you can order
the major subassemblies and some components through your Panasonic Service
Office. |
To aid you in recognizing problem areas, we recommend that you obtain a
diagnostics disk and an RS-232C loop-back plug from the Panasonic Service Office.
If you have any problems with the computer, contact the service office.

IMPORTANT NOTICE
This Technical Guide is written for engineers who have a thorough understanding
of electronics and computer circuitry and who are authorized to repair the
computer. It is not intended for the beginner.
If an unauthorized person should use this guide to repair, modify, or alter the
computer, Panasonic cannot be held responsible or liable for any damage caused or
alleged to be caused. We strongly suggest that for proper servicing, the
computer be returned to Panasonic.
Documentation Map
For Specialists For Users
JB-3300
Portable Computer
User's Manual
Service Manual
(For Field Service - Unit
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Technical Guide |
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JB-3300
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Hard
Disk
Drive,
Floppy
Reference
Guide
Disk
Drive,
LSI
Module
for
Users
MS-DOS Manual
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Basic Reference
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CONTENTS
I. GENERAL
SPECIFICATIONS 2... ccc ccc ccc cece crc ence cece svc csccccee wcrc cece eee e neces I-1l
1.1 LOGIC UNit cece ccc cc cc ccc ww cc cer er wre ccc ce cece ee ee cece cee eee cceces I-1
1.2 Plasma Display ccc cee ccc ccc ccc ccc ccc ccc essence cscs cece ccccens I-2
1.3 Floppy Disk DYivVe 2... cc ccc cc ce we ec ccc cece w ccc e meee eee ec eee nces I-2
1.4 Hard Disk Drive (Hard Disk VerSion) 2... cc ccc ccc cw we cc ec cece I-3
1.5 Keyboard cece cece ccc ccc ccc ccc cece cece cece cree cece cece reece ceseces I-3
1.6 POWEY SUPPLY 2. cece cece ccc cere ccc nsec racssccesccasescececcssesees I-4
1.7 FAN weccccscs cc ccccccrccccercce ser nes er encccererencesseseessseces I-4
1.8 SOFCWALE cece ccc ccc ccc cece c cere nar ce cece asec nce eee eee ese seeseses I-4
1.8.1 System SOftTWALE Lecce ccc c cece rere cece werner ccc ens necceces I-4
1.8.2 Program LangquageS ...ccwccccccccccccesccccvesssesvssecces I-5
1.9 DIMENSIONS Lecce ecccccccccccasceccceccesssssesesecsssssecccessces I-5
LL10 Weight Lecce ccc ccc ccc crc c ccc cece eae cece reece cee eee eee cece ees I-5
1.11 Environmental LimMitS 2... ccc cc ccc ccc cece cece cece were eee eects ces I-5
1.12 Destinations vs. Model NameS ... cc cc cw ccc cc wee cee cee ee eee ceeee I-6
SYSTEM CONFIGURATION 2... ccc cc ccc cc ce cc er ce ee eee wre cece eer sec e neces cceee I-7
BLOCK DIAGRAM 2. ccc cc ccc cece cc ec ec cee eee eee ee eee eee eee eee e eee ee eect eee I-10
HARDWARE OUTLINE ..c ccc cc ce ccc cc cece ew cc eee eee cece ee eect eee weer ee eceee I-11
4.1 General Description em ee eee eee meee eee eee eee emcee eee essere cces I-11
4.2 Ventilation ...... ecm meme e meee reece reece eee ene e reese sere seeeencns T-12
4.3 Memory Configuration weer cc ccc sence cern cnc ccc n cece ccececsscccces I-12
4.4 Input/Output Structure .e ccc cece ccc ccc ccc cee n eee c cece cesses sscees T-14
DISASSEMBLY PROCEDURE 2. ccc cc ccc ee ee cc ec cee cc ec ee ee ee eee reer eens ese sene T-15
5.1 System Unit/Plasma Display Unit 2... ccc cc cc we ccc ew cece eens T-16
5.2 System Unit/Floppy Disk Drive Unit 2... ccc ccc ccc cc ee cree eee I-18
5.3 System Unit/Power Supply Unit/Speaker ...... worm ewe cece ee cw ccc cns I-19
5.4 System Unit/Handle Mounting Assembly/I/O Board 2... eee ee eee eee I-21
5.5 System Unit/CPU Board 2... ccc cc cc ccc cw ee cc ctw cc ween c ence neces I-23
5.6 Precautions When Handling MOS ICS Le. ie ew ew ce ce wee cc eects I-24
PARTS LOCATION 2... cc ec ccc cc ce ec ee cee cece ere ee eect ee ee eee tee eee nee ee eees I-25
WIRING CONNECTION 2... cc ccc ccc ccc tee ec cece cree cre eee tee eee erect eee cees I-27
7.1 JB-3301L .o ccc ccc ccc ccc cece cer cece eee ee ee ee nee seer ese sseceees T-27
7.2 JB-3305 Lecce ccc ccc ccc ccc cre nc cee reece renee eee cence eee eee ses ceees T-31
REPLACEMENT PARTS LIST 2... cee ccc c ccc cree ccc c cree cere ere sees ences ecees I-35

TROUBLESHOOTING 2. nce ccc ccc ccc cece ccc cece ween cece reece ese cence ceccccce I-37
9.1 PYELACS Lo cece cece crew cece meee were sce e sence cases eseessccsccces I-37
9.2 Tools for Troubleshooting 2... cece cee cc cece cece cece cess esees I-38
9.3 How to Use Troubleshooting HintS ...... 2. cece wee ccc ce eee cece eee I-39
9.4 Self-Diagnostic TeSt Lo... ccc ccc ccc ec eee wee ccc cence ccc cc eccee T-69
9.5 DIAG PKOGLAM ec cece eee reer ccc e rene ree re rece seceseserccseseceees I-73
9.5.1 GENELAlL Lecce cree ccc reer ence rere csncssccsescescecsccece I-73
9.5.2 |= a=) OF ~ a= oes KO) 6 T-73
9.5.3 Loading DiagnoStic PYOGraM 2... ccc cecccccccccccccccsccces I-74
9.5.4 DiagGnOStic MENU 2... cece ccc cence crn ccccerrsccccccccsccces I-75
9.5.5 Test All DEVICES Lo. ccc cee cee cece ccc eee cee nce rece ececee I-76
9.5.6 Test Automatically wc cece cree ccc crew creer cer ce ccccace I-93
9.5.7 Change Menu 2... c cece cc rece cece acca cece cecccescsccsceces I-94
9.5.8 Brror LISting cece ccc ccc ccc arcs ccc cc cccseccccccsccccce I-95
9.5.9 Error MESSAGES .ewwece cc ccc cern scree sccseccccecccccsces I-96
9.5.10 EXit cece c ccc cc ce ccc cee wwe ewww eee w cere ccc cee eens eseeees I-103
II. LOGIC UNIT
SPECIFICATIONS 2. ccc ccc cc wee cee ec ee wre rece eee cree sence s acceso scccnens II-1
APPEARANCE 2.2... ccc ccc cece ence c cece cece reece cece rere eee cece eres eee ecee II-4
BLOCK DIAGRAM 2. ccc cc ecw ce cc wc ce cc we cme wre weer cece eee cece ees c erence esces II-5
MEMORY USAGE .... ccc cece cece cece ccc c cece cece cceaee eee eee eee ee ace II-7
4.1 Memory Map ...ccccccccccccccccsrcccccc ec r cece sec ec ccc resco secs oce TI-7
4.2 Display and Video RAM ConStruction 2... cece eee c cece cece nces TI-9
4.2.1 Basic Operation and Display ModeS ..........cccccccceas TI-9
4.2.2 Video RAM Configuration and Display Dots .............. IT-11
THEORY OF OPERATION 2.2.2... cccccccccscccccsccaccccvces eee c cc wcrc cer cccee II-18
5.1 GENEVAlL Lecce ccc ccc cece ence ees c err e cscs cess cesr scence essessecs II-18
5.2 System Resetting and System Clock Generation Circuits ......... II-19
5.3 CPU Lecce ccc ccc cc cence ccc ccc c ence rnc ence er ce sce cee c ccc cccccces II-22
5.4 Microprocessor Peripheral CircuitS ....cccwcccccccnccsccssccces II-22
5.5 Memory Control Circuit Lo. ccc weer ccc cc cece ccc c ence ccc ccc esnces TI-30
5.6 1D) 0 -\ Os is a0 b iy a ITI-36
5.7 T/O AddresS DECOdGEY 2... ccc cc ccc cece ce wer ccc cence cece c cece rece II-39
5.8 Interrupt Control Circuit co.cc cence cnc ccc r nrc cern nce n ce ncece ITT-45
5.9 Display Circuit coc cc ecw cc ccc ccc cen ccc snc ccsssccccessccessscses TI-46
5.10 I/O Interface Circuit co.cc cc wc wc ccc ec cc cc cece cece cere ccc cee TI-88
5.11 Programmable Internal Timer (8253-5) wc. ccc ewe www cc weer ee eee II-108
5.12 Switches ...........c0e0. cere eee cere emer ese serene rece scsccccce IT-109
5.13 Option Slot Interface oc. ecw wc cw w ewe ccc c ccc cer ccc cree cv ccvee TI-112
5.14 Option Slot Connector 2c wc ccc ccc cece recs scccccccscccsccscces II-114
~ii-

REPLACEMENT PARTS LIST AND DRAWING
6.1 CPU Board (PLSMX) ...... cece eeee wee c cence cece ee eeees eee eeee
6.2 I/O Board (PLSY) .........ee cece re cece cece twee c wee ees
| IIIf. PLASMA DISPLAY UNIT
1 e SPECIFICATIONS @oee*ee*e@ee#*eeees#s###e8ee#eee#e#te#ee#e#eee#ee#e#s#tee#eese§ee#@ e#eoeee#e#e#e#e#8#e*#e8t+e@ee#8e¢ee8¢e2 @ e« oe @#8 @® @ @ @ @
1.1 Display Panel ............ ccc e cere cee occ e cece ec eee ec eee ee eee
1.2 DYiver Unit weer eccccccccccccccccncncccenccccces cece cee ences
1.3 Power Supply 2.2... cc ee ccc nce ncccccccese rr
2. APPEARANCE .........4. eee ec ce econ emer ee cece ec e cen eccce ec cece een eee aees
3. BLOCK DIAGRAM .........cc ccc cvee cece cece ree scce eee e emer enw eee cece eee
4. OPERATIONAL PRINCIPLES ......... eee ce ere cc eee cece cece weer crc ccc sce coe
4.1 Display Panel ..... eee ceee rrr cece cece eee
4.2 Display Unit eoee7#s#2k_eese#e#eeee#ee#ee#e#eee#teee8ee80e6hmtmUMmlUOMlUO eoe@ecseeeesLseee#e#e#ee8e##e#e#eeeee#e?t#e#ee#e#8eeese
4.3 Description of Operation ..........2.ee0. ccc rece eee ccc eee eee ee
4.4 Names and Functions of Signals ............. cece ceeee cee cee cee
4.5 Notes ..... Ce ec ee cee rece eer e ese ces cesvees cece ee eee cece cere cence
5. DISASSEMBLY PROCEDURE .......... cc ecw ecco sees Cee ewe cece c rece cece ccc ee
5.1 Detaching Display from System Unit ...... ce eee eee sees ose ees
5.2 Driver Disassemby Procedure .......eeeee. eee ecw e ene rer
6. TROUBLESHOOTING ........2cccee occ eeeeee wc eee ecw meme reer c cre csnecccee oe
7. REPLACEMENT PARTS LIST AND DRAWING ............... we me cee eee err ec cccee
7.1 Exploded VieW 2... cece ccc ceness cece ee rec wer ce cee eee w ewe neces
7.2 Plasma Display and Driver ............ cee ees ra eee cece
7.3 Connections ....... ccc c ees ccc eeee eee mew eee ce nee ae eee ce eee oc eee
7.4 Circuit Drawing 2... cc cece wee cere cee Cece eee cee eee eecee cece eee
APPENDIX A. IC/LSI CATALOG .........2. ccc ewe cee cece cee ere eccee cece ec erceee
A.l IC/LSI etc. Pin Assignment .......... ce cc ecw cee ccc ce eee ccc eee ee
A.2 IC Specification wo. cece ewe ce eee c ccc eee cc eee ee ewes wee ee nce
- iii -
III-1
TII-1
IITI-1
III-3
TII-4
TII-5
ITI-5
III-6
III-6
III-11
ITI-11
TII-12
III-12
ITI-15
TII-17
TTI-21
IfI-21
TIIT-23
TITI-25
III-27
TII-39
IITI-39
TII-41

IV. KEYBOARD
SPECIFICATIONS ...........eceee- we ccc cee ec eee eee eee wee e ee eeeee Iv-1
LAYOUT AND KEYBOARD MARKINGS 2.2... 2. cc ee ce ccc ccc ccc ew cee rece cece ete cee IV-2
2.1 ASCII VErsSion ccc ccc ccc ccc cc ccc ccc cece e eee coc eee weet eee eect ccees IV-2
2.2 English VErsSion Lice ccc ccc ccc cc ec cee ccc cece ccc ee eee ewe nese eces IV-3
2.3 Swedish/Finnish Version ..... ccc ccc ccc ccc cc cccce ec cece cece nce ces IV~-3
2.4 French VErSion .e ccc ccc ccc cc cc cc cw ec ewe cece cece enc ec cere cesses IV-4
2.5 GErMAN VELSION Lecce cccccccccccccccccscesecccccssccsccsccesccees IV-4
BLOCK DIAGRAM 2... ccc ccc cc ce we ce ce cece ccc ewe etter ee ee eee eee eee c ees ccece IV-5
CIRCUIT DESCRIPTION 2... ccc ccc cw ee ce we cee weer ccc ce ete cee e eee eee we eee eee IV-6
4.1 Power Supply .........--. ccm reer were erence errr ens cesses sesssces IV-6
4.2 OSCLILLACOL Lecce cc ccc ccc ccc ccc ec ce cece cee ew eee eee eee weeecees IV~-6
4.3 Data Type and Logic ........2ce eee mcm mew ccc cece ccc cece cces TV-6
4.4 KBDATA and KBCLK Output Timing 2... ccc cc cee cece were crew eees IV-7
4.5 HARD RESET ccc ccc ccc cere reece ce wee cee eee eee eee ete e eee ee ee sccens IV-11
4.6 SCANNING cecccccccccccv cc cccccecccccc cc ecec ccc e cece cere sccsccces IV-11
4.7 Repeat FUNCCION cece c ccc cece ccc ccc ccc cece cerns cece secs eeacesscceee IV-14
SELF TEST Jo. cc eee ee ee wr wc cece ee ccc eer cee eee reece ee eee eee reso cee ne nccs IV-15
5.1 Self Test Start Condition ec ce meme ccc cree eee merece eect crease eeee IV-15
5.2 Self Test Flowchart 2... cc cc ccc ccc ecw cc eee ec re eee cece eee ees eeees IV-16
DISASSEMBLY PROCEDURE 2... cc. ccc ccc cc ccc ee wcrc ce ee cree wr eee ee eee arte sees IV-17
6.1 Keyboard cece cc cence s crc c cane ccc aces seca senses ese sessssesecceee IV-17
6.2 Key SwitcheS .o cece ccc ccc ccc ccc ccc c ccc cee rece e cece wees see cene IV-19
TROUBLESHOOTING . cc ccc ccc cw ccc re ec ccc eee ec cee eet eee weet reece ee eeeee IV-22
REPLACEMENT PARTS LIST AND DRAWING ..... 2. ccc ccc ew ce ccc ee ete eee eee eae IV-27
8.1 Exploded VIEW ccc cece ccc ccc cre ccc reece cee c cree cee cces ees eesees IV-27
8.2 Coard Table Lec ccc cc ce ccc ee cc wwe cee cece ee ec cere eee were eee es IV-32
8.3 Circuit D1iaAgGraM occ cw cc ccc ccc ccc sc ses ecscescsces ec cece ccc eee TV-33
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