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