Download VG8235 service manual

Home computer VG8235/00/02/19
ervice
ervice
ervice
38 571 A12
Service Manual
See also: VY0010/0011 supplement
SPÉCIFICATION (EL) SPECIFICATIE CF) CARACTERISTIQUES TECHNIQUES
Microprocessor : ZB0A Microprocessor : Z80A Micro processeur : Z80A
Memory 48k ROM Geheugen 48k ROM Mémoire 48k ROM
16k disk ROM 16k disk ROM 16k ROM a disque
128k video RAM 128k video RAM 128k RAM video
128k user RAM 128k gebruikers RAM 128k RAM utilisateur
Video processor : V9938 Videoprocessor - \9938 Processeur vidéo : V9938
MSX controller : S-3527 MSX controller - 8-3527 Contole MSX : S-3527
Fioppy-disk drive : 3.5", 0.5 MB Floppy-disk drive : 3.5”, 0.5 МВ Lecteur de disquette : 3.5", 0.5 MB
(UHF channel E36) (UHF kanaal E36) (Canal UHF E36)
Monitor output Monitor uitgang Sortie monitor
SCART SCART SCART
Cassette recorder Cassette recorder Magnétophne cassette
2 joysticks 2 handbedieningen 2 poignées
Printer Printer imprimante
2 cartridge slots 2 cartridge sleuven 2 "slots” cartouche
External disk drive Externe disk drive Lecteur externe
Keyboard : QWERTY /00 Toetsenbord : QWERTY /00 Clavier : QWERTY /00
QWERTZ /02 QWERTZ /02 QWERTZ /0?
AZERTY /19 AZERTY /19 AZERTY /19
Power supply voltage : 220V + 10%, 50 Hz Voedingsspanning - : 220V + 10%, 50 Hz Tension d'alimentation : 220V + 10%, 50 Hz
(D) TECHNISCHE DATEN (1D DATA TECNICI
Mikroprozessor : ZBOA Microprocessore : Z80A
Speicher 48k ROM Memoria 48k ROM
16k Disk-ROM 16k AOM a disco
128k Video-RAM 128k RAM video
128k Gebrauchers-RAM 128k RAM utilizzatori
Videoprozessor : V9938 Processore video : V9938
MSX-Steuereinheit : $-3527 MSX di controlio : $-3527
Floppy Disk-Laufwerk : 3,5”, 0.5 MB Lettore di dischetto : 3.5”, 0.5 MB
Schnittstellen : RF Ausgang Interfaccie : Uscita RF
(UHF Kanal E36) (Canale UHF E36)
Monitorausgang Uscita monitore
SCART SCART
Cassettenrecorder Registratore a cassetta
2 Handbedienungen 2 leve manuali
Drucker Stampa
2 Kassettenschlitze 2 connettore per cartuccia
Externes Disk-Laufwerk Connettore disk drive
Tastatur : QWERTY /00 Tastiera : QWERTY /00
QWERTZ /02 QWERTZ /02
AZERTY /19 AZERTY /19
Versorgungsspannung : 220V + 10%, 50 Hz Tensione d'aliment. : 220V + 10%, 50 Hz
DocumentationTechnique Service Dokumentation Documentazione di Servizio Huolte-Ohje Manual de Servicio Manual de Servicio
Subject to modification
Service Consumer Electronics
“Pour votre sécurité, ces documents
doivent étre utilisés par des spécia-
tistes agréés, seuls habilités à réparer
votre appareil en panne”.
4822 727 15562
Printed in The Netherlands
Copyright reserved
a
N >
BF
Scanned, ocr’ed and converted to pdf by HansO, 2001
CAUTION
1. The exchange of cartridges should take place with
the set turned off.
All ICs and many other semi-conductors are
susceptible to electrostatic discharges (ESD).
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are connected
with the same potential as the mass of the set via a
wrist wrap with resistance.
Keep components and tools also at this potential.
ADJUSTMENTS
VDP Clock frequency
- Connect a frequency meter to 8-U25 via a 10:1 probe.
— Adjust TC3 for a frequency of 3.554685 MHz on 8-U25.
FDC clock frequency
- Connnect a frequency meter to 24-U3 via a 10:1 probe.
~ Adjust TC2 for a frequency of 1 MHz on 24-U3.
For the adjustments of the floppy disk drive, reference is
made to the service manual VY0010/0011 supplement.
RTC clock frequency
~ Connect a frequency meter to 17-U1 via a 10:1 probe.
— Adjust TC1 for a frequency of 32.768 KHz on 17-U1.
Encoder unit
— Connect a resistor (75 2 '/, W) between 5-CN2 and
ground.
— Connect a voltmeter between 5-CN2 and ground.
— Enter the programme of table 1.
— Adjust the voltage on 5-CN2 for 1Vpp by means of VR1.
— Connect a resistor (75 Q ‘/, W) between 4-CN2 and
ground.
~ Connect a voltmeter between 4-CN2 and ground.
- Enter the programme of table 1.
— Adjust the voltage on 4-CN2 for 1 Vpp by means of VR2.
Supply voltage
- Connect a voltmeter between CN2-1 and ground on
the supply voltage panel.
— Adjust VR1 for a voltage of -11,9V on CN2-1.
— Check the voltage between CN2-6 and ground (+5V).
— Check the voltage between CN2-8 and ground (+12V).
AD
WAARSCHUWING
5
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
REM ENCODER ADJUSTMENT
CLEAR 100, &HOFFF
FOR 1=0 TO 36
AD=&HA000+1
READ Z
POKEAD, Z
NEXT |
DEF USRO=&HA000
SCREEN?
COLOR, 2
FOR 1=1 TO 8
X=32+ (1-1) : XX=X+31
LINE (X,0)-(XX,191), 1, BF
NEXT |
Y=USRO (0)
GOTO 150
DATA &HF3, &H3E, &H1, &HD3, &H99
DATA &H3E, &H90, &HD3, &H99, &HE
DATA &HSA, &H26, &HAO, &H2ZE, &H15
DATA &H6, &H10, &HED, &HB3, &HFB
DATA &HC9, &HFF, &HF, &HFO, &HF
DATA &HF, &HF, &HO, &HF, &HFF
DATA &H0, &HFO, &HO, &HF, &HO
DATA &HO, &HO
TABLE 1
FFFF
8000
0000
FFFF
C000
8000
4000
0000
SLOT O
MEMORY LAY-OUT
SLOT 1
MSX
BASIC
32K
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CARTRIDGE
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SLOT 31
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| M7
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U7 74LS20 5322 209 85569
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U11 74LS08 5322 209 81626
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U20 74LS74 5322 209 81647
U21 74L5125 532? 209 81569
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U23 74LS670 5322 209 85938
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U26 74L5367 5322 209 85558
U27 74LS14 5322 209 83427
U28 74145 5322 209 80236
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U30 74LS00 5322 209 81623
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U32 74LS30 4822 209 83428
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U42,U43 7415157 5322 209 81521
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U48 BASIC ROM /02 4822 209 50647
U48 BASIC ROM /19 4822 209 50648
U49 EXP. ROM /00 4822 209 50649
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RAG-RA8 4k7 x 8 4822 116 90191
RAS-RA10 22k x 8 4822 111 90935
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С48,С82, Cer. chip C 1nF 50 V
C112,C113
C49 Cer. chip C 10 pF 50 V
C51 Cer. chip C 30 nF 50 V
C67,C68 Cer. cnip C 12 pF 50V
C70,C71 Cer. chip C 560 pF 50 V
C80,C81 Cer. chip C 100 pF 50 V
C115 Cer.chipC 3pF50V
TC1 Trimmer 30pF
TC2,TC3 Trimmer 20pF
-
LF1-LF7,
LF9, ) _
LF30-LF43, Filter C = 22 nF
LF69,LF86
LF8 Troidal ceil
LF10,LF11 Line filter
LF12-LF15,
LF17-LF29, _
LF70-LF76, Filter C = 270 pF
LF78-LF84
LF16, Filter C = 100pF
LF44-LF68
LF77, LF85 Filter C = 10nF
LF90 RF coil
VARIOUS
RY1 Relay
X1 32.768 KHz
x2 16 MHz
X3 21.32812 MHz
BT1 NI-CD accumulator
ST1,ST2 Service jumper
4822 280 20166
4822 242 71347
4822 242 71346
4822 242 71345
4822 138 10172
4822 276 11572
POWER SUPPLY
ENCODER UNIT
4822 212 22406
4822 212 22533
4822 212 22536
4822 209 83909
4822 209 83911
4822 208 70246
5322 209 81625
4822 209 83582
4822 130 33259
4822 130 33266
4822 130 33267
4822 130 33262
4822 130 33263
4822 130 33264
4822 130 33265
4822 130 33261
4822 130 33682
4822 113 60171
4822 113 60168
4822 113 60169
4822 111 20382
4822 130 42814
4822 130 42815
4822 130 42814
4832 130 42815
4822 130 33038
4822 130 33039
4822 116 21084
4822 116 21085
4822 121 42553
4822 121 42554
4822 122 50089
4822 121 42555
4822 157 52703
1 A (grounded p/s) 4822 157 52467
4822 157 52468
8 mH 5 A (grounded p/s) 4822 157 52469
4822 157 52704
4822 157 52471
4822 130 43505
4822 138 30037
4822 146 21114
о.
U101 Grounded power supply
U101 Power supply
IC] UC3842
1C2 TLP431CLP-B
PC1 TLP 732
Di +
D1 2W06 1.8 A 600 V
D2,D3 PLR818 1 À 1000 V
D4,D5 15581 0.2 A 150 V
D6 ERC84-009 3 A 90 V
D7 ESA82-004 10 A 40 V
D8 ERA84-009 1 A 90 V
D9 EGP10B 1 À 100 V
ZD1 HSZ16E 0.4 W zener
(grounded p/s)
ZD1 HSZ18E 0.4 W zener
T +
R5 470Q2W
R7 1Q2W
R24 220 QQ 2 W
VR1 1k 0.5 W variable
4
C1 0.47 uF 250 V polyester
C6 0.01 uF 250 V polyester
C7 220 pF 2 kV ceramic
C8,C23 0.1 uF 63 V polyester
YY
L1 18 mH 0.8 A
Li 10 mH
L2 47 mH 2.2 A
L3
L3 15 mH 4.5 A
L4,L5 100 mH 1,5 A
VARIOUS
TR1 2SC3376 transistor
TH1 16D-9 16 © thermistor
T1 Transformer
4822 157 52419
4822 157 52421
4822 242 71323
4822 218 20547
4822 212 22535
4822 130 32984
4822 130 32983
4822 130 32982
fui
U102 Encoder unit
—
IC1 74LS04
IC? LVA510
Q1-Q3 25C1684
Q4-Q6 2SC458
Q7 25C1684
Q8,Q9 2SC458
> Pi
D1,D2 158119
D3 MA4100
{1
VR1 Variable 2k
VR2 Variable 10k
VARIOUS
L1,L2 22 uH coil
L3 33 uH coii
X1 4.433619 MHz
Modutator
LED PANEL
ATA
U103 LED panel
„и
+
LD1 LED yellow
LD2 LED green
.LD3 LED red
VARIOUS
Sw1 Reset switch
Reset knob
4822 277 10862
4822 410 24402
FLOPPY DISK DRIVE
U104
Floppy disk drive
4822 693 90446
39 334 O12
The memory mapper of the VG8235/00/02/19 may give
problems (second memory bank is not accessible).
Solution: Mount a capacitor of 1nF between pin 7-U23
and 8-U23 (GND).