Casio TV-M420S, TV-8700S Service manual
CH CALL
INDEX
(without price)
TV-M420S(KX-504S)
TV-8700S(KX-514S)
FEB. 1996
TUNING
VHF
UHF
24
14
OFF VHF UHF
VOLUME
BRIGHT
5
30
6
40
50
7
11
60
13
69
CH
CH
EAR
EXT.ANT
AUDIO/
VIDEO
DC IN 12V
504030 60 69
VHF 2 4 5 6 7 11 13 CH
UHF 14
CH
TV-8700STV-M420S
R
CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
PRINTED CIRCUIT BOARDS ....................................................................... 3
EXPLODED VIEW ......................................................................................... 7
ELECTRICAL PARTS LIST........................................................................... 9
MECHANICAL PARTS LIST ....................................................................... 17
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 19
SCHEMATIC DIAGRAMS ........................................................................... 21
WAVEFORMS.............................................................................................. 23
SPECIFICATIONS
Item Specification
1. Reception channels VHF: 1 ~ 12 ch UHF: 13 ~ 69 ch
2. Power voltage DC 12.0 V
3. Power consumption TV-M420S: Approx. 6.7 W TV-8700S: Approx. 6.1 W
4. Current consumption TV-M420S: Approx. 558 mA TV-8700S: Approx. 508 mA
5. Battery life (with alkaline batteries) Approx. 8.0 hours (TV-8700S only)
Batteries : 4 x LR20 (D) size batteries (TV-8700S only)
6. Power supply Car adaptor : CA-K1200
AC adaptor : AD-K1200
Earphone jack : 3.5 ø mini
7. Connection terminals External power jack : 12.0 V DC IN
External antenna jack : 3.5 ø mini
Audio/Video jack : 3.5 ø mini
Diversity jack : 3.5 ø mini (TV-M420S only)
8. Screen size 4 inches
9. No. of picture element 153,360 (213 x 720) dots
10. Dimensions TV-M420S : 104 mm (H) x 142 mm (W) x 41 mm (D)
TV-8700S : 104 mm (H) x 142 mm (W) x 74 mm (D)
11. Weight TV-M420S : 354 g excluding batteries
TV-8700S : 445 g excluding batteries
12. Options AC adaptor : AD-K1200
Car adaptor : CA-K1200
RF connector : CF-13
Antenna matching device : AS-35S
TUV
Areas whose signals this TV cannot receive.
— 1 —
Antenna
BLOCK DIAGRAM
1 TU 2 Q200
Tuner IF Amp.
7 IC400
Tuning
Voltage
Generator
Power
Supply
VCC2 (4.3 V)
VCC7 (45 V)
VEE1 (-7.1 V)
VR800
Brightness
Control
3 IC200
Video
Sound
FM
AFT Circuit
AGC Circuit
5 IC300, IC500
6 IC700
OSC
Display
Control
A/D Converter
Auto-tuning
Control
8 IC800
Det.
}
Chroma
Circuit
Display
Voltage
Generator
1 — Tuner TU TEPM5-01
Selects a desired radio wave, and changes it to the video IF signal.
VR640
Volume
Control
4 IC600
Common
Driver
Speaker
Audio
Amp.
LCD
Segment
Driver
2 — Video IF Amp. Q200 2SC4238
Amplifies the video IF signal output from the tuner TU by 10 times (20 dB).
3 — Video, Sound, FM Det., AGC IC200 M51348FP
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
Also the sound signal is picked up from the sound IF signal by FM detection.
4 — Audio Amp. IC600 NJM386 (TV-M420S), NJM2070 (TV-M8700S)
Sound amplification.
5 — Chroma Circuit IC300 M51403FP, IC500 M51404AFP
Generates the tricolor of red, green and blue from the video signal.
6 — OSC, A/D Converter, Display / Auto-tuning Control : IC700 MSM6625-01 GSK-640E
Converts the color signal into digital signal.
Also generates the clock pulse for the display, and controls the display.
7 — Tuning Voltage Generator IC400 MSC1169MS-K
Generates the tuning voltage from the tuning pulse (TU) output of 6.
8 — Display Voltage Generator IC800 BA10358F
Generates the display voltages V0 ~ V4 from VEE1 and VCC7 outputs of the power supply.
— 2 —
TV-M420S
PRINTED CIRCUIT BOARDS
CP190
CP800
CP807
CP729
CP727
CP725
CP723
CP721
CP805
CP803
CP801
CP700
R706
CP255
HP706
R105
D100
C137
R107
CP104
R109
C136
L950
+
C900
CP808
C840
CP708
D200
CP100
C832
CP728
R704
R108
C831
CP722
C755
CP259
C138
R110
CP185
R836
CP704
HP705
CP710
L100
R835
Q802
Q803
JK100
IC800
CP726
CP724
R821
D803
R820
R809
R808
IC700
R703
CP751
D703
R707
C135
IC100
C145
Q100
CP240
R115R114
R124
R132
R123
Q111
C271
CP706
1
C740
C741
C742
R131
C142
C140
D155
R140
D150
R119
R118
JK201
R296
CP111
C155
C765
CP110
C158
R141
CP101
D550
CP701
CP702
CP703
C160
CP108
R142
D152
R550
CP280
CP200
R295
IC201
R246
R252
R253
Q205
Q204 Q206
R275 R274 R273
Q201 Q202 Q203
R419
C477
R422
C468
C455
C454
R403
C152
CP109
C238
CP245
CP400
C478
R423
C480
C153
JK202
R201
R203
R205
Q200
R206
R254
CP402
CP403
C456
C500
+
HP200
C237
CP221
R202
C236
R204
R207
C239
L200
C240
CP106
Q207
R258
R257
R272
C252
IC400
CP603
CN900
R208
R259
R410
R409
C462
C460
C550
CP211
C233
C242
R251
C253
R600
C530
R500
R502
R510
R512
R515
R517
R211
C245
C246
L201
C247
R262
CP401
R415
C466
CP210
C243
C249
R263
C630
CP530
R212
R260
C358 C357
R300
R641
C641
IC600
CP690
CP209
CP590
C379
CP303
R323
R330
CP107
R318
R301
C353
R324
R651
Q600
C355
D600
CP208
C234 C230
CP206
IC500
IC200
R320
R302
C356
C360
R303
C365
R309
C642R642
C640
CP640
R650
C202
+
CP207
R541
R224
R545
C545
C542
CP542
C541
CP541
CP250
R242
C267
C264
C263
C261
R239
C259
R230
C255
R227
CP235
CP253
R319
L300
C381
C382
R321
C380
C303
R308
R256
R270
R271 R290
JK200
C270
CP204
CP224
R326
R317
Q301
R325
IC300
R312C362 R306
CP750
R292
R291
R316
C192
C373
R313
R314
C385
D310
SW700 SW701 SW702
C925
T950
SW100
CP600
VR800 VR640
JK600
Top View
— 3 —
TV-M420S
R620
R950
R951
C930
R150
R151
D170
Q140
C130
C101
C210
C806
CN700
C108
C170
R104
R701
C776
R705
R702
R730
R819
R817
R816
R815
Q951Q950
C104
D103
R103
C132
R125
C758
R734
R733
D705
C760
C751
C750
Q800
Q801
C835
R822
Q810
Q811
R834
C830
C815
C777
L720
T100
R121
C141
C106
D158
VR100
R126
L700
C761
D700
D707
VR700
C756 R725
R726
R727
L705
C700
R827
R833
R810
C808
C810
D804
C214
R738
Q806
Q804
R823
R824
C845
Q805
D805
R102
L102
D105
D153
C154
C114
C118
R750
R830
R825
C115
C223
C221
Q115
T401
T403
R247
C927
L101
C112
C410
C475
C476
R421
F201
F204
F207
L202
C220
L104
C457
F202
F205
C113
T400
R412
Q401
R411
R402
C458
R401
C463
C451
R400
C450
C452
R420
C400
F203
R408
C481
F206
C600
C603
R406
R407
C461
VR400
C470
C472
C471
R418
F300
R261
L103
R222
C269
C207
F200
C205
C606
H300
C361
Q400
C467
T404
T402
Q208
C254
R608
R607
R606
R602
C313
C304
VR300
VR301
C301
L400
C305
C257
R223
C208
Q210
R280
R281R213
VR200
R209
R210
TU200
C485
R429
C351
C300
R283
C213
R282
R241
C310
R428
R284
DL400
R236
SW200
T200
T201
C262
L105
C540
504S-L-B
R770
C780
C375
C306
FU100
C185
D185
R225
R226
C250
Bottom View
— 4 —
C781
C231C232
C235
TV-8700S
CP190
CP807
CP729
CP727
CP725
CP723
CP721
CP805
CP803
CP801
CP800
R706
CP255
HP706
C106
CP104
C108
L950
C900
CP808
C840
CP700
CP708
D200
+
CP100
+
C832
CP728
R704
+
C831
CP722
C755
CP259
CP185
R836
CP704
R104C140
R102
JK100
R835
D803
R820
Q802
Q803
R703
D703
R707
HP705
CP710
C142 +
IC100
L100
Q100
IC800
CP726
CP724
R821
R809
R808
IC700
CP751
C141
R103
C145
CP240
C271
CP706
1
C740
C741
C742
Q111
D155
R140
D150
R119
R118
JK201
CP111
C155
CP701
CP702
CP703
CP110
C158
R141
CP101
D550
C160
CP108
D152
R550
CP200
CP280
R246
R252
R253
Q205
Q204 Q206
R275 R274 R273
Q201 Q202 Q203
R419
C477
R422
C468
C455
C454
R403
C153
C152
CP109
C238
CP245
CP400
C478
R423
C480
R205
R206
R254
C456
R201
R203
Q200
CP402
CP403
CP603
C500
+
HP200
C237
CP221
R202
C236
R204
R207
C239
L200
C240
CP106
Q207
R258
R257
R272
C252
IC400
R601
CN900
R208
R259
R410
R409
C462
C460
C550
CP211
C233
C242
R251
C253
C530
R500
R502
R510
R512
R515
R517
R211
C245
C246
L201
C247
R262
CP401
R415
C466
C630
CP210
C243
C249
R263
CP530
R212
R260
C358 C357
R300
IC600
CP690
CP209
CP590
C379
CP303
R323
R330
CP107
C642
R642
R318
R301
C353
R324
CP208
CP206
IC500
IC200
R320
R302
C356
C360
R303
C365
C355
R641
C641
C640
CP640
C202
+
CP207
C234 C230
R541
R224
R545
C545
C542
C541
CP541
CP250
R242
C267
C264
C263
C261
R239
C259
R230
C255
R227
CP235
CP253
R319
L300
C381
C382
R321
C380
R309
C303
R308
R256
R270
R271 R290
C270
CP204
CP542
R326
R317
Q301
IC300
R312C362 R306
R307
CP750
R292
R291
C192
JK200
CP224
R325
C373
R313
R316
R314
C385
D310
SW700 SW701 SW702
C925
T950
JK600
CP600
Top View
— 5 —
SW100
VR800 VR640
TV-8700S
R620
R950R951
D104
C930
C138
R126
C210
C806
CN700
C135
R701
R705
R702
R730
R125R123
C776
R819
R817
R816
R815
C181
D705
C760
C751
C750
Q800
Q801
C835
Q810
Q811
R834
C815
C182
Q951Q950
C104
D103
IC101
Q115
VR100
C758
R734
R733
C756 R725
L705
R810
R822
C830
C777
C214
T100
C137
R124
C136
C143
R105
L700
C761
D700
D707
VR700
R726
R727
R827
R833
C808
C810
D804
R738
C700
C765
Q806
Q804
R823
R824
C845
Q805
D805
L102
C118
L750
R830
R825
C115
C927
L101
C112
T401
T403
F201
F207
R247
L202
C457
C410
C475
C476
R721
F202
F204
C113
L104
T400
Q401
R402
R401
C463
C451
C450
R420
C400
F205
R600
R412
R408
R411
C458
R400
C452
F203
F206
C600
C603
R406
R407
C461
C481
VR400
C470
C472
C471
R418
F300
R261
L103
R222
C269
C207
F200
C205
R606
R607
H300
C361
Q400
C467
T404
T402
Q208
C254
R605
C313
VR300
VR301
C301
L400
C257
R223
C208
Q210
R280
VR200
R209
R210
TU200
C304
C485
R429
C351
C300
C305
R283
C213
R281R213
R282
R241
C606
C310
R428
R284
R236
SW200
DL400
T200
T201
C262
L105
C540
514S-L
R770
C780
C375
C306
C185
C183
FU100
D185
R225
R226
C250
Bottom View
— 6 —
C781
C231C232
C235
TV-M420S
EXPLODED VIEW
11
1
11-1
S-2
2
3
S-1
2-1
4
5
6
S-1
14
7
8
S-2
12
13
S-3
S-4
10
9
S-3
S-4
S-5
— 7 —
S-3
15
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