Casio TV-M420B, TV-8700B Service manual
CH CALL
INDEX
(without price)
TV-M420B (KX-504B)
TV-8700B (KX-514B)
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-8700BTV-M420B
R
CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
PRINTED CIRCUIT BOARDS ....................................................................... 3
EXPLODED VIEW ......................................................................................... 7
ELECTRICAL PARTS LIST........................................................................... 9
MECHANICAL PARTS LIST ....................................................................... 15
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 17
SCHEMATIC DIAGRAMS ........................................................................... 19
WAVEFORMS.............................................................................................. 21
SPECIFICATIONS
Item Specification
1. Reception channels VHF: 2 ~ 13 ch UHF: 14 ~ 69 ch
2. Power voltage DC 12.0 V
3. Power consumption TV-M420B: Approx. 6.7 W TV-8700B: Approx. 5.7 W
4. Current consumption TV-M420B: Approx. 558 mA TV-8700B: Approx. 475 mA
5. Battery life (with alkaline batteries) Approx. 9.0 hours (TV-8700B only)
Batteries : 4 × LR20 (D) size batteries (TV-8700B only)
6. Power supply Car adaptor : CA-K1200
AC adaptor : AD-K1200
Earphone jack : 3.5 ø mini
External power jack : 12.0 V DC IN
7. Connection terminals External antenna jack : 3.5 ø mini
Audio/Video jack : 3.5 ø mini
Diversity jack : 3.5 ø mini (TV-M420B only)
8. Screen size 4 inches
9. No. of picture element 153,360 (213 × 720) dots
TV-M420B : 104 mm (H) × 142 mm (W) × 41 mm (D)
10. Dimensions
TV-8700B : 104 mm (H) × 142 mm (W) × 74 mm (D)
TV-M420B : 354 g excluding batteries
11. Weight
TV-8700B : 445 g excluding batteries
AC adaptor : AD-K1200
Car adaptor : CA-K1200
12. Options
RF connector : CF-13
Antenna matching device : AS-35S
— 1 —
Antenna
BLOCK DIAGRAM
2 IC200
IF Amp.
Video
Sound
FM
AFT Circuit
AGC Circuit
Chroma Circuit
4 IC700
OSC
Display
Control
A/D Converter
Auto-tuning
Control
6 IC800
Det.
}
Display
Voltage
Generator
Power
Supply
1 TU
Tuner
5 IC500
Tuning
Voltage
Generator
VCC2 (3.95 V)
VCC7 (45 V)
VEE1 (-8 V)
VR800
Brightness
Control
1 — Tuner TU TEPU5-02
Selects a desired radio wave, and changes it to the video IF signal.
VR640
Volume
Control
3 IC600
Common
Driver
Speaker
Audio
Amp.
LCD
Segment
Driver
2 — Video, Sound, FM Det., AGC, Chroma circuit IC200 CST-2
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
The sound signal is picked up from the sound IF signal by FM detection.
Generates the tricolor of red, green and blue from the video signal.
3 — Audio Amp. IC600 NJM386 (TV-M420B), NJM2070 (TV-M8700B)
Sound amplification.
4 — 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.
5 — Tuning Voltage Generator IC500 MSC1169MS-K
Generates the tuning voltage from the tuning pulse (TU) output of 4.
6 — Display Voltage Generator IC800 BA10358F
Generates the display voltages V0 ~ V4 from VEE1 and VCC7 outputs of the power supply.
— 2 —
TV-420B
PRINTED CIRCUIT BOARDS
CP722
CP725
HP120
C153
C152
+
C900
C930
CP721
CP723
CP800
+
C806
C155
+
C108
C808
+
C185
C700
+
+
+
C112 C113
+
C118
C160
L100
+
D155
JK100
CP190
CP185
CP251
CP820
CP807
CP806
CP733
CP731
CP724
C810
+
IC800
C832 R835
C830
CP804
CP110
C115
VR110
R141
Q111
C138
T950
CP702
CP726
C239
CP227
CP109
R140
D103
C240
CP729
CP728
D150
CP701
CP703
CP801
CP727
CP108
C170
R150
R109
Q115
CP705
R827 C845
CP802
R110
C136
C141
R102
CP100
JK250
C238
C740
R201
C741
C742
CP223
CP720
C777
R706
CP252
CP734
C751
C755
L705
C758
D804D805Q806
Q805
R825
R824
R823
R833
R834
Q140
C137
D170
R108
R107
IC100
R123
R121
C140
R132
C142
R124
R131
D105
CP101
JK600
C204
+
R200
R704
CP700
C756
R733
R115
R104
R103
C135
C132
R125
R126
CP260
CP246
C205
R726 R727 R725
IC700
C760
R730
C761
D705
D700
L700
VR700
R734
R738
D707
R114
R105
D100
C130
CP104
VR100
CP990
CP600
CP603
+
C603
C227
JK205
+
F203
R719
R703
R718
C776
D703
R705
CP111
R600
CN900
CP224
C250
CP244
C236
+
C225
+
C216
CP225
CP226
C234
C542
R260
C235
HP706
CP222
CP221
C237
VR200
CP106
HP705
R702
CP670
R677
R678
CP673
C682
R607
VR800
CP542
HP200
R602
Q600
CP204
CP206CP207CP208CP209
CP211
C630
C680
IC600
R606
R601
C231
C232
C233
CP671
D600
CP707
C641
R641
+
C200
R541
CP210
C550
C201
C545
CP541
CP270
R642 C642
C500
R545
R550
CP751
C540
C541
D550
CP590
C780
R701
CP704
CP750
R676
C192
C640
CP640
VR640
JK200
C299
R707 C781
IC500
CP530
R770
SW702
SW701SW700
SW100
Top View
— 3 —
TV-M420B
C925
L950
C158
R820
CN700
C145
R144
D803
C815
R950
R142
R817
+
Q951 Q950
C104
T100
D152
L101
Q120
Q130
D160
C840
C831
R836
R819
R809
D165
+
Q802
C750
R143
L104
C835
Q803
Q801
C203
R816
Q800
R810
R821
R815
C106
Q811
R808
+
R822
R620
C927
Q100
Q810
HP600
R118
R119
C765
Q804
R830
IC200
L102
+
C101
IC670
L720
C778
+
C600
L103
HP110
L105
SW670
+
C627
+
C606
AT600
R202
+
C206
C202
+
TU200
R502 C530
R510
R512
R515
R517
R500
HP100
FU100
IC203
D185
R261
Bottom View
— 4 —
TV-8700B
CP722
CP725
C153
C152
C108
CP721
CP723
CP800
+
C155
+
+
C806
C900
C808
+
+
C112 C113
C160
+
C700
+
+
C118
JK100
CP190
C184
CP820
CP806
CP733
CP724
C810
+
+
C832 R835
CP804
C115
R141
D155
C138
CP185
CP251
CP807
CP731
IC800
C830
CP726
C239
CP110
R140
Q111
C240
CP702
CP729
CP728
CP227
D150
CP701
CP703
CP801
CP727
R827 C845
CP802
CP108
CP109
R102
CP100
JK250
C238
C740
R201
C741
C742
CP223
CP720
C706
R706
CP252
CP705
CP734
C751
C755
D804D805Q806
Q805
R825
R824
R833
R834
C140 R104
IC100
R103
C141
CP101
C204
R200
CP700
L705
C758
R823
C142
CP260
+
R726 R727 R725
R704
CP253
C756
R733
R734
CP246
C205
IC700
C760
R730
D705
D700
VR700
R738
VR100
C761
L700
D707
CP104
C143
CP990
C776
R705
R105
F203
CP705
R719
R703
R718
D703
CP111
CN900
CP224
CP244
C236
R600
CP225
C250
CP673
VR200
CP106
R601
CP226
C542
CP222
C237
R702
C234
C235
HP706
CP221
HP705
CP670
C630
R605
R606
CP542
HP200
R607
CP204
CP206CP207CP208CP209
CP211
IC600
C231
C232
C233
CP671
C641
R641
+
C200
R541
CP210
CP707
C550
C201
C545
R545
CP541
CP270
R642 C642
C500
R550
C540
C541
C640
CP590
C780
R701
CP704
CP751
D550
JK200
R707 C781
IC500
CP530
CP750
R770
C192
CP640
C299
SW702SW701SW700
SW100
C925
T950
JK600
CP600
CP603
+
C603
Top View
— 5 —
VR800
VR640
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