Casio TV-600B Troubleshooting guide

R
(with price)
Page
Specifications.............................................................................................1
Block Diagram ...........................................................................................2
Circuit Description......................................................................................3
Adjustment
Linear PCB..........................................................................................5
A/D PCB..............................................................................................9
Troubleshooting.......................................................................................10
Printed Circuit Boards..............................................................................11
Wiring Diagram........................................................................................15
Exploded View / Disassembly..................................................................16
Electrical Parts List ..................................................................................17
Mechanical Parts List...............................................................................23
IC and Transistor Lead Identification .......................................................24
Schematic Diagrams and Waveforms .....................................................26
POCKET TELEVISION
DECEMBER 1994
TV-600B

— 3 —
BT
BS
VCC6
TU
H/L
BU
VREF
GND
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
Vcc
BS
BT
IN
OUT
TU
H/L
U/V
VREF U1 U2 VL1 VL2 VH1 VH2 GND
R500R501R502
IC500 MSC1169MS-K
Function
CIRCUIT DESCRIPTION
TUNING VOLTAGE GENERATOR
Table 1
Figure 2
Figure 1
This circuit generates the DC tuning voltage BT for selecting a channel with a TU pulse being output from
IC700.
IC500 has 3 circuits for converting pulses to voltages; it selects one of VHF-L, VHF-H, or UHF, and
causes the tuning voltage to be output from the OUT terminal (pin 12). Figure 2 and Table 1 show the
conditions for selection.
IC500
TU OUT(BT)
U/V H/L
VHF
-H
UHF
VHF
-L
11
910
12
U/V
L
L
H
H
H/L
L
H
L
H
Inputs
VHF-L receiving
VHF-H receiving
UHF receiving
UHF receiving

— 4 —
Vref
7
6
5
32
D152
D155
D150
VCC7
VCC2
VEE1
R111
T100
R117
C105
C100
Q111
C140
R115
C145
1
9
Q101
Q100
R101
VR100
D100
C115
C114
L102 R133
VCC2-3 VCC2-2
L101
C113 C110 C112
C135
R102
CP100
VCC1-1
CP109
CP108
CP110
GND
CP104
4VCC6
CP107
D152
POWER SUPPLY
Figure 3
Name Voltage Function
VCC2 3.95 ±0.02 V Main voltage
VCC6 30.5 ~ 39.0 V Tuning voltage
VCC7 53.5 ~ 72.5 V Tuning voltage/Display voltage
VEE1 –6.3 ~ –7.9 V Display voltage
The power supply consists of a DC-DC converter and causes the voltages to be output as shown in Table 2.
Table 2

— 5 —
ADJUSTMENT
LINEAR PCB
Items To Be Adjusted
Item Measuring Instrument
VCC2 voltage setting Voltmeter
Video detection coil adjustment TV signal generator, pattern generator, oscilloscope,
low-pass filter
AFT coil adjustment Sweep generator, oscilloscope, voltmeter
Contrast adjustment TV signal generator, pattern generator, oscilloscope
AGC adjustment TV signal generator, pattern generator, IF levelmeter
Adjustment And Test Point Locations
Top View
T201
T200

— 6 —
Equipment Connection / Adjustment Procedure
Bottom View
TP5
VR300
TP7
TP1
VR100
VR200
TP3
TP4
TP2
PadIF
VCC2 Voltage Setting
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
Adjust for 3.95 ±0.02 V
reading on voltmeter.
Voltmeter
VR100
Set
Output
Voltmeter
TP1
TP1
TV-600

— 9 —
A/D PCB
Item to Be Adjusted
Adjustment And Test Point Locations
Item Measuring Instrument
Clock adjustment Voltmeter
TOP VIEW
TP6
VR700
Clock Adjustment
Voltmeter
VR700 TP6
Equipment Connection / Procedure
Adjust for 2.05 ±0.05 V read-
ing on voltmeter.
Set
Output
Voltmeter
TP6
TV-600
Adjust Result
Input Input Input Output Output
Connection Point Signal Connection Point

— 11 —
PRINTED CIRCUIT BOARDS
TOP VIEWS
Linear
BL
T950
C925
C927
L950
Q950
Q951 R950 507BL
1
DB –DB –DB –
CN700
+ +
C110 C105
T100
+
C112
C100
+
+
C115
L101
C114
+
+
C113
T201T200
C210
R223
L102
+
R222
+
F202
C208
FU100
D180
JK100
DB +DB +
C244
+
C207
F201
SW100
C305 F200
L202
+
C309
+
H300
C340
C345
R310
C348
R322
R326
R346 R336
R335
C291
R247
C290
R133
TU200
C202
+
JK200

— 12 —
VR100
R500
C550 R115
R212
R210 C262
C237
R204 C240
L200C335
R307 R306
C146
R246 C249
C185
C259
R236
C351
R330
C330
Q300
VR300
VR301
VR200
IC300 IC200
IC500
D155
D152
D154
D100 D150
Q101
Q100
Q200
HP200
CP327 CP326
CP325
CP207 CP210
CP209
R224
CP208
CP204
CP203
C234
CP541
R545
C545
C235
R541
R550
CP500
R502
R501
C135R101
R117
C140
R111
CP110
Q111
CP542
CP322
CP320
CP235
CP236
CP108
CP104
CP100
CP107
CP206
CP221
R201
C233
R207
R202
C236
R203
R205
R305
CP340
CP330
R208
R209 C245
C263C261 C264
CP240
R230
R229 C257
CP211
CP245
R331
C350
R325
C246
CP224
CP590
CP109
C145
BOTTOM VIEWS
Linear
BL
HP903 HP902
FU900 FU901
HP906
HP905
HP950
HP900 HP901

— 13 —
IC703
C770
C775
IC702
C835
R808
R814
R810
R800
C830
R827
R740
R727
R815
Q802 Q801
C836
R816
Q800
R809
D800
R833
Q805
D805
R830
Q806 Q804
R825
R824
R845
C841
D803
C840 R820
R726
R725
SW700
UP
SW701
DOWN
IC700
R700
R803
R704
R611
C642
C630
C755
C756
C760 R730
D705
L705
VR700
D707
17
HP700
R710
R706 R707
R610
R733C758
R606 R607
R645
R738
IC701
TOP VIEW
A/D

— 14 —
BOTTOM VIEW
A/D
STB
D4
D5
V4
CDB2
VC
CNB2
V0
CFB2 VCC2-8
V3
D6
D3 D2 D1
SNB
CK2
CK1
PD
GND2
VR600
VR800
GND1
R615
C740C741
D700 D701
C761
C734
IC600
JK600
C742
C750
C751
R719
C635
R641
BL+
BL-
SP-
SP+ C765
C603
C606
C806
C808
C800

— 15 —
WIRING DIAGRAM
TOP VIEWS
1
17
1
17
A/D PCB
Linear PCB

— 16 —
EXPLODED VIEW / DISASSEMBLY
18
16
19
17
14
15
20
11
12
9
7
8
10
13
7
8-5
12-1
12-2
15-1
15-2
15-3
8-1 8-2 8-3
8-4
8-2
6-3
1
3
4
5
6
2
7
7
6-5
6-6
6-7
6-8
6-9 6-10
2-1
2-2
6-1 6-2
6-4

— 24 —
IC200 IC300
M51348FP 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 Fsc
SY OUT 4 21 VCXO IN
HDIN 5 20 COLOR
Y CLAMP 6 19 TINT
Y LPF 7 18 KILLER RF
Y OUT 8 17 APCF
CONT 9 16 SW
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
NC 1 8 NC
+IN 2 7 VCC
–IN 3 6 OUT
GND 4 5 GND
IC600
NJM2070M

— 25 —
2SB709A
2SC4238 2SD601A
2SD1149-S
C
BE
2SD1119
C
BEC BEC
2SD965R
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

— 26 —
SCHEMATIC DIAGRAMS AND WAVEFORMS
LINEAR
1
76
5
23
8
9
10
TP4
TP3
TP1
TP2
Pad IF TP5
TP7 BU
BS
BV
BM
VHF(L) VHF(H) UHF
4
0
21
3.8
3.8
0
0
3.8
3.8
3.8
0
0
3.8
3.1
1.9
1.9
1.9
3.6 0.9
1.7
0.8
1.1
2.9
2.9 1.8 2.9 3.8 3.1 3.1
3.7
1.4
1.4
33.7
21/0
0~22.8
1.6
1.7
2.1
2.8/0
0/3.8
3.5
2.9
4.7
2.9
3.8
1.7
2.9
3.3
1.4 3.5
1.9
0.4
2.5
2.5 0.7 0.4 2.9 2.6
1.4
1.4
1.4
1.4

— 27 —
A/D
11
12
TP6

— 28 —
Vcc1–1 GND 1
2
GND
C925
T950 NT–01
CP900
Vcc9
TF50VO. 18
HP950 fromAD
1 2 3 4 5
Vcc1–1
HP901 HP903
FU900 102deg FU901 102deg
HP900 HP902
HP90612
L950
CK 100u
*R950
820
Q950 2SD965–R
Q951 2SD965–R
C927
HP905
LA900
2inch (ST)
10 150p
CP990
BL

— 29 —
WAVEFORMS
63.5 µs 63.5 µs 63.5 µs
1.0 V0.9 V3.4 V4.0 V
2.8 V
2.6 V
800 mV
14 V
2.2 V
3.0 V 1.1 V
112 mV
1Q200 Collector
4IC300 Pin 23
7IC300 Pin 4
0Q111 Base AIC700 Pin 16 BIC700 Pin 14
8IC300 Pin 1 9Q111 Collector
5IC300 Pins 10, 11, 12 6IC300 Pin 5
0.24 µs 63.5 µs
63.5 µs
5.2 µs 130 ns 420 ns
63.5 µs 5.2 µs
63.5 µs
2IC200 Pin 19 3IC200 Pin 18