Casio TV-770B Troubleshooting guide

R
TV-770B(KX-503B)
(without price)
(For NTSC)
JUN. 1996
TV-770B
CH 2 4 5 6 7 11 13
CH 14 30 40 50 60 69
INDEX

CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
PRINTED CIRCUIT BOARDS ....................................................................... 3
EXPLODED VIEW ......................................................................................... 5
PARTS LIST .................................................................................................. 6
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 10
SCHEMATIC DIAGRAMS ........................................................................... 13
WAVEFORMS.............................................................................................. 15

— 1 —
Item Specification
1. Reception channels VHF: 2 ~ 13 ch UHF: 14 ~ 69 ch
2. Power voltage DC 6.0 V
3. Power consumption Approx. 3.6 W
4. Current consumption Approx. 600 mA
5. Battery life (with alkaline batteries) Approx. 4.0 hours
Batteries : 4 ×LR6 (D) size batteries
6. Power supply Car adaptor : CA-K65
AC adaptor : AD-K64, 65
Earphone jack : 3.5 ø mini
7. Connection terminals External power jack : 6.0 V DC IN
External antenna jack : 3.5 ø mini
8. Screen size 2.3 inches
9. No. of picture element 39,600 (110 ×360) dots
10. Dimensions 127 mm (H) ×81 mm (W) ×35 mm (D)
11. Weight 200 g without batteries
AC adaptor : AD-K64, 65
12. Options Car adaptor : CA-K65
Antenna matching device : AS-35S
SPECIFICATIONS

— 2 —
1— Color tuner: TU200 TEPU5-02
Selects a desired radio wave and changes it to the video IF signal.
2— Video IF amp.: Q200 2SC4238
Amplifies the video IF signal output from tuner TU200 by 10 times (20 dB).
3— Video det./Sound det./FM det./AFT/AGC: IC200 M51348FP
EliminatesthecarrierwaveinthevideoIFsignal,andpicksupthevideosignalandthesoundIFsignal.
Also, the sound signal is picked up from the sound IF signal by FM detection.
4— Audio amp.: IC600 NJM2070M
Sound amplification.
5— Chroma circuit: IC300 M52042FP
Generates the tricolor (red, green, and blue) from the video signal.
6— Osc./A-D converter/display control/auto-tuning control: IC700 MSM6625-02 GSK-640F
Converts the color signal into a digital signal.
Also, generates the clock pulse for the display and controls the display.
7— Tuning voltage generator: IC500 MSC1169MS-K
Generates the tuning voltage with the tuning pulse output from 6.
8— Display voltage generator: Q800~Q803, Q805, Q806, 2SD601A-R x 4, 2SB709A-R, 2SD1149-S
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
BLOCK DIAGRAM
Antenna
1TU200 2Q200 3IC200
7
Tuning
Voltage
Generator
VR600
Volume
Control
4IC600 Speaker
IC300
IC700
Common
Driver LCD
Segment
Driver
Chroma
Circuit
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
5
6
8Q800~Q803, Q805, Q806
VR800 Display
Voltage
Generator
Brightness
Control
VCC2 (3.95 ±0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (–6.1 ~ –7.3 V)
IC500
Power
Supply
Audio
Amp.
IF Amp.Tuner
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
Det

— 3 —
PRINTED CIRCUIT BOARDS
TOP VIEWS
Linear
Back Light
R335
R336
R255
R256
R236
C259 C281 R254
R252 R251
C263 C262 R261
C245
R212
R257
R253
R222
R209
C249
R224
C780
R808 R809 R810
C742 C741
C270
C740
R305
R306
C351
R226 C346
R322
C340 R310
R110
R108
C140
R115
R113
R704
C236
R816
R813
R820
C782
R745
R830
C750
D805
D803
Q101
Q110
D155
R738
D707
VR100
VR301
VR300
C330
VR700
R840
L101
R223
VR200
CN710
C305
C309
H300
C208
C210
C207 C202
C205 C606
C603
C806 C808
C700
C800
IC700
C112 C115
C105
C113
C100
C110
D150
SW100
T100
FU100
VR800
VR600
T200
T201
,,,,
,,,,
F220
,,,,
,,,,
F221
,,,,
,,,,
F210
,,,,
F211
,,
,,
,,
,,
F203
,,
,,
,,
,,
,,
,,
F200
L103
L102
L202
TU200
JK200 JK600
,,
,,
,,
,,
,,
,,
,,
,,
,,
CN700
JK100
D180
T950
C927
C925
CN950
L950

— 4 —
BOTTOM VIEWS
Linear
Back Light
IC200
R331 R330 C350 R116
C348
C347 R326 R325
R247
Q300 R225 C230
R210
OR
BR R645
R706 C282 C345
R307 C335
R707C730
IC300
R260 R258
Q230
R259
C272
R246
C264
C261R241 R239
HD AFT
AUDIO
HP210 VIDEO
COL
ATT
VCC2-3
CP244
BM
SW200
R815 R814 C837
C840
C836
Q801 Q800
Q802 Q803
D800
L710
C770
C841
R800
C830
R803
R827
R833
Q806
Q805
R615
R825 R727
R726
R725
C-SYNC
VEEI
R
G
R733
C760
C756
D705
R730 C758 C761
R719 R718
KDB
B
L705
C751
C755
R700
PD
R709
R710
R711
HP700
C765
VCC2
D152
C153
VCC2-0 C152
Q111
C145
C160
D703
C150
C130 VCC7
GND
R106
R107
C137 C155 D110
D100
R105
TM100
C182
C185
R208
C243
R211
CP330
C233
CP200
R150
C242
C246 BT
BV
BU
C240
VCC1-1 H/L TU
Q200
C238
R205
R202 R207
C550
C237 R203
R201
R204
L200
C239
C232
D500
R503 C530
R550
R500 R501 R502
R607 R606
HP701
C200
C231
R541
C545 C234 R545 C535
R610
R611C250
C635
R641
C630
C265 C642
C641
RF
BS
IC500 IC600
VCC2-8
HP200
IF
CP590
Q950
Q951
R950
R746
C783
CP900
CP990
CP902
SW700
HP906HP905
SW710

— 5 —
10
6
15
16
19 20
18
11
12
13 21
9
5
4
14
1
2
3
LA900
17
8
8
7
7
5
25
24
23
22
EXPLODED VIEW

PARTS LIST
LINEAR PCB
Item Code No. Parts Name Specification Q R
Diodes
D100 2390 1176 Chip diode MA152WK-(TX) 1 C
D110 2315 0166 Chip zener diode MA3047-L(TX) 1 C
D150 2390 1176 Chip diode MA152WK-(TX) 1 C
D152 2390 1176 Chip diode MA152WK-(TX) 1 C
D155 2390 1302 Chip diode MA153A-(TX) 1 C
D180 2390 1190 Chip diode ERA15-01Y 1 C
D500 2360 1344 Chip zener diode MA3330-M(TX) 1 C
D703 2390 0469 Chip diode MA157A-(TX) 1 C
D705 2390 1358 Variable diode MA329-(TX) 1 C
D707 2360 1113 Chip zener diode MA3082-M(TX) 1 C
D800 2360 2919 Chip zener diode MA3056-L(TX) 1 C
D803 2390 0469 Chip diode MA157A-(TX) 1 C
D805 2390 1253 Chip diode MA152WA-(TX) 1 C
Fuse
FU100 3632 0469 Fuse PI-251001(F10) 1 A
ICs
IC200 2114 1827 Linear IC M51348FP-T1 1 C
IC300 2114 3332 Linear IC M52042FP-T1 1 C
IC500 2114 0182 Linear IC MSC1169MS-K-620 1 C
IC600 2114 2464 Linear IC NJM2070M-T1 1 C
IC700 2011 3514 LSI MSM6625-02GSK-640F 1 C
Jacks
JK100 3501 8281 Jack HEC0811-010010 1 B
JK200 3501 5439 Jack HSJ1456-01-210 1 C
JK600 3501 5439 Jack HSJ1456-01-210 1 C
Transistors
Q101 2230 7011 Chip transistor 2SD601A-R(TX) 1 B
Q110 2230 7011 Chip transistor 2SD601A-R(TX) 1 B
Q111 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q200 2252 0707 Chip transistor 2SC4238-(TX) 1 C
Q300 2210 8026 Chip transistor 2SB709A-R(TX) 1 C
Q800 2230 7011 Chip transistor 2SD601A-R(TX) 1 C
Q801 2210 8026 Chip transistor 2SB709A-R(TX) 1 C
Q802 2230 7011 Chip transistor 2SD601A-R(TX) 1 C
Q803 2230 7011 Chip transistor 2SD601A-R(TX) 1 C
Q805 2253 0476 Chip transistor 2SD1149-S(TX) 1 C
Q806 2230 7011 Chip transistor 2SD601A-R(TX) 1 C
Switch
SW100 3412 0938 Slide switch ESD-11V231 1 C
Converter
T100 3065 0672 DC-DC converter LC12U-40 1 B
Tuner
TU200 1013 5511 Tuner TEPU5-02 1 C
Variable resistors
VR600 2765 1708 Volume XV081PV1NB10K3017 1 C
VR800 2765 2037 Volume XV081PV1NB20K3017 1 C
Notes: Q – Quantity per unit
R – Rank — 6 —

BL PCB
Item Code No. Parts Name Specification Q R
Lamp
LA900 3851 1918 Fluorescent lamp 3064BB-CA39 1 A
Transistors
Q950 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Q951 2253 0308 Chip transistor 2SD1119-R(TX) 1 B
Switches
SW700 3412 1029 Switch SKHHAL 1 C
SW701 3412 1029 Switch SKHHAL 1 C
Transformer
T950 3012 1470 Inverter trans NT-07 1 B
Notes: Q – Quantity per unit
R – Rank — 7 —

MAIN COMPONENT
Item Code No. Parts Name Specification Q R
1 6611 0980 Display plate BXM-K503 K440797-1 1 C
2 6611 1010 Adhesive tape A-K503 K440801-1 1 X
3 6611 0870 Upper case BXM-K503 K140252-1 1 X
4 6020 7658 Battery spring B1 G513 P408A-1 1 X
5 6020 7666 Battery spring B2 G513 P409A-1 2 X
6 3831 0854 Speaker 28-8F-03 1 C
7 6611 0990 Cushion A-K503 K440802-1 2 X
8 6611 1000 Cushion B-K503 K440802-2 2 X
9 6611 2290 Tuning button A-K503 K240481-1 1 X
10 6611 0890 Battery cover A-K503 K240450-1 1 X
11 2725 1218 LCD PSG123CO-TO 1 C
12 6611 0930 Light diffuser sheet A-K503 K440800-1 1 X
13 6611 0900 Reflector case K503 K140261-1 1 X
14 6611 2261 BL unit K340625*1 1 B
15 6611 0910 Switch knob A-K503 K340575-1 1 X
16 6611 0960 Battery spring A-K503 K440798-1 1 X
17 6611 0970 Battery spring B-K503 K440799-1 1 X
18 6611 2256 Linear PCB ass'y K240495*1 1 B
19 3851 1470 Rod antenna VR70100GA 1 B
20 6611 0880 Lower case BXM-K503 K140253-1 1 X
21 6611 2300 Stand A-K503 K310518-7 1 C
22 6611 2310 Rating plate BXM-K503 K340609-1 1 X
23 6609 1290 Screw A-K610 K412031-1 1 C
24 5860 0532 Screw BT3 1.7X9 Bk 1 C
25 6609 9630 Screw A-K720 K410188-6 1 C
Notes: Q – Quantity per unit
R – Rank — 8 —

The following electrical parts will be not supplied from CASIO. (For TV-770B)
C100 10RE2-220 C756 GR40Y5V103Z50PT R307 ERJ-6GEYJ152V
C105 6.3RC2-47MS-T36 C758 GR40Y5V104Z25PT R310 ERJ-6GEYJ474V
C110 10RC2-33MS-T36 C760 GR40W5R222K50PT R322 ERJ-6GEYJ473V
C112 6.3RC2-100MS-T36 C761 GR40Y5V104Z25PT R330 ERJ-6GEYJ302V
C113 6.3RC2S-100-T36 C770 GR40Y5V224Z16PT R331 ERJ-6GEYJ511V
C115 50RC2-10MS-T36 C782 GR40Y5V224Z16PT R335 ERJ-6GEYJ223V
C137 GR40W5R682K50PT C806 50RC2-3R3-T36 R336 ERJ-6GEYJ683V
C140 GR40CH471J50PT C808 50RC2-2R2-T36 R500 ERJ-6GEYJ104V
C145 GR40W5R332K50PT C830 GR40Y5V104Z25PT R501 ERJ-6GEYJ563V
C182 GR40Y5V104Z25PT C836 GR40Y5V104Z25PT R502 ERJ-6GEYJ274V
C185 GR40Y5V104Z25PT C837 GR40CH221J50PT R541 ERJ-6GEYJ223V
C200 UMK316B104K-T C841 UMK316F474Z-T R545 ERJ-6GEYJ684V
C202 6.3RC2-47MS-T36 CN700 52806-2010 R550 ERJ-6GEYJ152V
C205 50RC2-2R2 CN710 9210B-1-04Z009-T R606 ERJ-8GEYK4R7V
C207 6.3RC2-47MS F200 SAF45MB200Z R607 ERJ-8GEYK4R7V
C208 6.3RC2-47MS F203 TPS4.5MB R610 ERJ-6GEYJ153V
C210 16RC2-10-T36 F210 SFSL4.5MDB12 R611 ERJ-6GEYJ132V
C233 GR40Y5V103Z50PT F220 CDSL4.5MC30C12 R615 ERJ-6GEYJ222V
C234 GR40Y5V104Z25PT H300 HC-49U R641 ERJ-6GEYJ104V
C236 GR40Y5V103Z50PT L101 LEM4532-470K-TP R645 ERJ-6GEYJ470V
C237 GR40Y5V103Z50PT L102 EL0405RA-101K-2 R700 ERJ-6GEYJ105V
C238 GR40Y5V103Z50PT L200 LK2125-R82K-TP R704 ERJ-6GEYJ273V
C240 GR40Y5V103Z50PT L202 LAL02VA150J R706 ERJ-6GEY0R00V
C243 GR40Y5V103Z50PT L705 LEM3225-270K-TP R707 ERJ-6GEYJ0R00V
C245 GR40W5R103K50PT L710 BK2125HS601-T R710 ERJ-6GEYJ560V
C246 GR40Y5V103Z50PT R105 ERJ-6GEYJ222V R711 ERJ-6GEYJ270V
C249 GR40Y5V474Z16PT R106 ERJ-6GEYJ103V R719 ERJ-6GEY0R00V
C259 GR40W5R223K25PT R107 ERJ-6GEYJ333V R725 ERJ-6GEYF131V
C261 GR40PH560J50PT R108 ERJ-6GEYJ274V R726 ERJ-6GEYF751V
C262 GR40Y5V103Z50PT R110 ERJ-6GEYJ271V R727 ERJ-6GEYF102V
C263 GR40PH560J50PT R113 ERJ-6GEYJ222V R730 ERJ-6GEYJ562V
C264 GR40CH1R5C50PT R115 ERJ-6GEYJ220V R733 ERJ-6GEYJ104V
C265 GR40Y5V103Z50PT R116 ERJ-6GEYK4R7V R738 ERJ-6GEYJ303V
C281 GR40CH270J50PT R201 ERJ-6GEYJ820V R745 ERJ-6GEYJ272V
C282 ERJ-6GEY0R00V R202 ERJ-6GEYJ472V R800 ERJ-6GEYJ473V
C305 16RC2-10-T36 R203 ERJ-6GEYJ222V R803 ERJ-6GEYJ242V
C309 6.3RC2-47MS-T36 R204 ERJ-6GEYJ561V R808 ERJ-6GEYJ153V
C330 EMK316B474K-T R205 ERJ-6GEYJ220V R809 ERJ-6GEYJ153V
C335 GR40CH331J50PT R207 ERJ-6GEYJ151V R810 ERJ-6GEYJ153V
C340 GR40W5R103K25PT R208 ERJ-6GEYJ272V R813 ERJ-6GEYJ223V
C345 GR40W5R471K50PT R209 ERJ-6GEYJ103V R814 ERJ-6GEYJ223V
C346 GR40W5R333K25PT R210 ERJ-6GEYJ472V R815 ERJ-6GEYJ562V
C348 GR40Y5V104Z25PT R211 ERJ-6GEYJ104V R816 ERJ-6GEYJ223V
C350 GR40CH181J50PT R212 ERJ-6GEYJ222V R820 ERJ-6GEYK475V
C351 GR40CH220J50PT R222 ERJ-6GEYJ470V R825 ERJ-6GEYJ103V
C545 GR40W5R333K25PT R223 ERJ-6GEYJ124V R827 ERJ-6GEYJ333V
C550 GR40Y5V683Z50PT R224 ERJ-6GEYK475V R830 ERJ-6GEYJ223V
C603 6.3RC2-100MS-T36 R225 ERJ-6GEY0R00V R833 ERJ-6GEYJ223V
C606 6.3RC2-100MS-T36 R236 ERJ-6GEYJ274V R840 ERJ-6GEYJ103V
C630 GR40Y5V103Z50PT R239 ERJ-6GEYJ392V T200 S5LD3-01
C635 EMK212F105Z-T R246 ERJ-6GEYJ181V T201 S5LD3-01
C642 GR40Y5V104Z25PT R247 ERJ-6GEYJ102V TM100 157-102-53031-TP
C700 6.3RC2-47MS-T36 R251 ERJ-6GEY0R00V VR100 EVN5ESX50B23
C740 GR40Y5V104Z25PT R256 ERJ-6GEYJ561V VR200 EVN5ESX50B54
C741 GR40Y5V104Z25PT R257 ERJ-6GEYJ182V VR300 EVN5ESX50B14
C742 GR40Y5V104Z25PT R258 ERJ-6GEY0R00V VR301 EVN5ESX50B54
C750 GR40CH470J50PT R261 ERJ-6GEY0R00V VR700 EVN5ESX50B15
C751 GR40CH470J50PT R305 ERJ-6GEYJ102V
C755 GR40UJ270J50PT R306 ERJ-6GEYJ473V
— 9 —

— 10 —
IC200 IC300
M51348FP-T1 M52042FP
IF AGC OUT 1 24 IF AGC ADJ
IF AGC IN 2 23 SyOUT
RF AGC 3 22 SyIN
AGCDL 4 21 AFTC
VCCv 5 20 LLD
IFIN 6 19 LLD
IFIN 7 18 VIDEO
GNDv 8 17 AFT
VCCs 9 16 SIFOUT
SIFIN 10 15 FMD
FB 11 14 ATT
GNDs 12 13 AUDIO
VIDEO 1 24 VCC
SY IN 2 23 VCXO OUT
ACCF 3 22 NC
SY OUT 4 21 VCXO IN
HDIN 5 20 COLOR
Y CLAMP 6 19 TINT
Y LPF 7 18 KILLER F
Y OUT 8 17 APCF
CONT 9 16 APCREF
R 10 15 KILLER OUT
G 11 14 PIX
B 12 13 GND
IC AND TRANSISTOR LEAD IDENTIFICATION
IC/LSI
Vref 1 16 VCC
U1 2 15 BS
U2 3 14 BT
VL1 4 13 IN
VL2 5 12 OUT
VH1 6 11 TU
VH2 7 10 H/L
GND 8 9 U/V
IC500
MSC1169MS-K-620
NC 1 8 NC
+IN 2 7 VCC
–IN 3 6 OUT
GND 4 5 GND
IC600
NJM2070M-T1

— 11 —
2SB709A
2SC4238 2SD601A
2SD1149-S
C
BE
2SD1119
C
BEC
IC700
MSM6625-02GSK-640F
TRANSISTORS
AFT
M1
M2
M3
M4
M5
M6
TE6
TE5
TE4
TE3
TE2
TE1
VSS2
CK1
ECB
STB
SCB
CNB
CFB
CDB
SNB
D6
D5
D4
D3
D2
D1
14
13
12
11
10
9
8
7
6
5
4
3
2
1
KDB KCB AVB UHF VLB TU MTB VDD1 HDB C-S PD OSC2 OSC1 CK2
28 27 26 25 24 23 22 21 20 19 18 17 16 15
AD2 AD1
B
G
R
RLL
VDD2
RHH
M7 M8 M9
M10
PS1
VSS1
43 44 45 46 47 48 49 50 51 52 53 54 55 56
29
30
31
32
33
34
35
36
37
38
39
40
41
42
M11

— 13 —
SCHEMATIC DIAGRAMS
LINEAR
Antenna
External Antenna
Jack
Tuner
DC In
Audio Amplifier Circuit
Tuning Voltage Generator Circuit
IF Detection Circuit
Earphone
Jack
Speaker
Display Controller Circuit
Chroma Circuit TP5 Display Generator Voltage
Circuit
5
9
TP6
8
1
2
4
34.2 ~ 41.8 V
-6.1 ~ -7.3 V
3.95 V
Power Switch
Power Supply Circuit
TP1
TP7
TP2
TP3
TP4
IF Pad
3
10
76

— 14 —
Notes:
1. All resistance values are indicated in "ohms" (k=103ohms, M=106ohms).
2. All capacitance values are indicated in "µF" (p=10-6 µF).
3. All inductance values are indicated in "µH."
BACK LIGHT

— 15 —
1Q200 collector 2IC200 pin 19 3IC200 pin 18
4IC300 pin 23 5IC300 pin 12 6IC300 pin 5
7IC300 pin 4 8IC300 pin 1 9IC700 pin16
0IC700 pin 14
63.5 µs 63.5 µs 63.5 µs
0.24 µs 63.5 µs 63.5 µs
63.5 µs 63.5 µs 130 ns
420 ns
2.0 V
0.8 V
0.1 V
0.8 V
1.8 V
3.0 V
3.0 V
0.8 V
3.0 V
3.0 V
WAVEFORMS

8-11-10, Nishi-Shinjuku
Shinjuku-ku, Tokyo 160, Japan
Telephone: [phone]