Casio TV-600G 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
MARCH 1995
TV-600G/H(KX-507G/H)
INDEX

SPECIFICATIONS
— 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. 3.4 W
4. Current consumption Approx. 566 mA
5. Battery life (with alkaline batteries) Approx 3.0 hours
Batteries : 4 AA size batteries
6. Power supply Car adaptor : CA-K65
AC adaptor : ADK-65, 64
Earphone jack : 3.5ø mini
7. Connection terminals External power jack : 6.0V DC IN
External antenna jack : 3.5ø mini
Audio / Video jack : 3.5ø
8. Screen size 2.2 inches
9. No. of Picture element 39,600 (110 ×360) dots
10. Dimensions 81 (W) ×32 (D) ×131 (H) mm
3 1/5" (W) ×1 1/4" (D) ×5 1/6" (H)
11. Weight 220 g excepting batteries
7.8 oz excepting batteries
12. Standard accessories Test batteries (R6 × 4)
AC adaptor : AD-K65, 64
13. Options Car adaptor : CA-K65
RF connector : CF-13
Antenna matching device : AS-35S
14. Body color Black

— 2 —
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~Q802, Q804~Q806
VR800 Display
Voltage
Generator
Brightness
Control
VCC2 (3.95±0.02 V)
VCC6 (30.5~39.0 V)
VCC7 (53.5~72.5 V)
VEE1 (–6.3~–7.9 V)
IC500
Power
Supply
Audio
Amp.
IF Amp.Tuner
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
Det
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 the tuner TU by 10 times (20 dB).
3— Video Det./Sound Det./FM Det./AFT/AGC: IC200 M51348FP
Eliminatesthe carrier wavein the video IF signal,and picks upthe video signal and thesound IF signal.
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 (TU) output from 6.
8— Display Voltage Generator: Q800~Q802, Q804~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

— 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

— 7 —
Video Detection Coil Adjustment
TP2 VR300 TP5
Pattern
generator
Signal
generator
Color bar
45.75 MHz
70 ±3 dBµOscilloscope Adjust step form wave to read
0.8 ±0.05 Vp-p.
Signal
generator
Pattern
generator Set Oscilloscope
Input Output
TP5
TP2
* Desolder the IF pad to open.
Contrast Adjustment
TP2 T201 TP4
Adjust for 2.0 ±0.2 V reading
on voltmeter.
Confirm that the marker is at
the middle of S-curve on oscil-
loscope.
Sweep
generator Set Oscilloscope Voltmeter
Output
Input
* Desolder the IF pad to open.
TP2 TP4
AFT Coil Adjustment
Pattern
generator
Signal
generator
TP2 T200 TP3
Low-pass filter
Oscilloscope
Color bar
45.75 MHz
40 ±3 dBµAdjust for DC level at mini-
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
* Desolder the IF pad to open.
Signal
generator
Pattern
generator Set Low-pass
filter
Oscilloscope
Input Output
TP3
TP2
Voltmeter
Oscilloscope
Sweep
generator
45.75±5 MHz
(Sweep) Marker:
45.75 MHz
70 ±3 dBµ
TV-600
TV-600
TV-600

— 8 —
AGC Adjustment
Signal
generator
Pattern
generator Set
Input Output
IF levelmeter
TP2
TP7
TV-600
Pattern
generator
TV signal
generator
TP7 VR200 IF levelmeter TP2
Input Input Input Output Output
Connection Point Signal Connection Point
Color bar
65 ±5 dBµAdjust for 84 ±2 dBµ
reading on the IF levelmeter
* Short the IF pads.
Adjust Result

— 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
Input Input Input Output Output
Connection Point Signal Connection PointAdjust Result