Casio tv600cdi Schematic
POCKET TELEVISION
TV-600C
TV-600D
TV-600I
TV-600N
DECEMBER 1994
(without 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
R
SPECIFICATIONS
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
— 1 —
Antenna
1
TU200
7
Tuning
Voltage
Generator
IC500
2
IF Amp.Tuner
Q200
BLOCK DIAGRAM
3
IC200
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
5
Det
IC300
Chroma
Circuit
VR600
Volume
Control
Common
Driver
4
IC600 Speaker
Audio
Amp.
LCD
IC700
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
8
Q800~Q802, Q804~Q806
Display
Voltage
Generator
Power
Supply
VCC2 (3.95±0.02 V)
VCC6 (30.5~39.0 V)
VCC7 (53.5~72.5 V)
VEE1 (–6.3~–7.9 V)
6
VR800
Brightness
Control
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
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
Also, the sound signal is picked up from the sound IF signal by FM detection.
4 — Audio Amp.: IC600 NJM2070M
Sound amplification.
Segment
Driver
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.
— 2 —
CIRCUIT DESCRIPTION
TUNING VOLTAGE GENERATOR
BT
BS
16
15
BS
Vcc
VCC6
IC500 MSC1169MS-K
14
BT
13
IN
12
OUT
11
TU
10
H/L
TU
H/L
BU
9
U/V
VREFU1U2
1
2
VL1
VL2
VH1
VH2
GND
3
4
5
6
7
8
VREF
R500R501R502
GND
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
11
VHF
-L
VHF
-H
UHF
910
U/V H/L
Figure 2
12
OUT(BT)
— 3 —
Inputs
U/V
L
L
H
H
H/L
L
VHF-L receiving
H
VHF-H receiving
L
UHF receiving
H
UHF receiving
Table 1
Function
POWER SUPPLY
Vref
VCC1-1
C100
D100
C105
CP100
VR100
R101
C135
Q100
Q101
R111
R102
C140
Q111
R115
C145
R117
Figure 3
1
9
CP104
T100
GND
VCC2-2
L102
D155
32
4
5
D152
6
7
D150
D152
C112
L101
C110
C113
VCC2-3
R133
VCC7
CP108
VCC6
CP107
VCC2
CP109
VEE1
CP110
C115
C114
The power supply consists of a DC-DC converter and causes the voltages to be output as shown in Table 2.
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
Table 2
— 4 —
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
T201
T200
Top View
— 5 —
TP7
VR100
TP5
VR300
TP2
TP1
PadIF
VR200
TP3
Bottom View
Equipment Connection / Adjustment Procedure
VCC2 Voltage Setting
TV-600
Set
TP4
Voltmeter
Output
TP1
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
VR100
Voltmeter
— 6 —
TP1
Adjust for 3.95 ± 0.02 V
reading on voltmeter.
* Desolder the IF pad to open.
Pattern
generator
Signal
generator
Video Detection Coil Adjustment
TV-600
Set
Input Output
TP2
TP3
Oscilloscope
Low-pass
filter
Input Input Input Output Output
Connection Point Signal Connection Point
Pattern
generator
Signal
generator
TP2 T200 TP3
Color bar
38.9 MHz (TV600C, I, N)
39.5 MHz (TV600D)
40 ± 3 dBµ
Adjust Result
Low-pass filter
Oscilloscope
AFT Coil Adjustment
* Desolder the IF pad to open.
Sweep
generator
Sweep
generator
Input
TP2
38.9 ± 5 MHz
(Sweep) Marker: 38.9 MHz
70 ± 3 dBµ (TV-600C, I, N)
TP2 T201 TP4
39.5 ± 5 MHz
(Sweep) Marker: 39.5 MHz
70dBµ (TV-600D)
TV-600
Set
Oscilloscope Voltmeter
Output
TP4
Voltmeter
Oscilloscope
Adjust for DC level at mini-
Adjust for 2.0 ± 0.2 V reading
on voltmeter.
Confirm that the marker is at
the middle of S-curve on oscilloscope.
* Desolder the IF pad to open.
Pattern
generator
Color bar 38.9
Pattern
generator
Signal
generator
MHz
70 ± 3 dBµ
TP2 VR300 TP5
(TV-600C, I, N)
39.5 MHz 70 dBµ
(TV-600D)
Contrast Adjustment
Signal
generator
Input Output
Oscilloscope
— 7 —
TP2
TV-600
Set Oscilloscope
TP5
Adjust step form wave to read
0.8 ± 0.05 Vp-p.
* Short the IF pads.
AGC Adjustment
Pattern
generator
Signal
generator
TV-600
Set
Input Output
TP7
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
TP2
Pattern
generator
TV signal
TP7 VR200 IF levelmeter TP2
Color bar
65 ± 5 dBµ
generator
IF levelmeter
Adjust for 84 ± 2 dBµ
(TV-600C, I, N)
84 ± 1 dBµ (TV-600D)
reading on the IF levelmeter
— 8 —
A/D PCB
Item to Be Adjusted
Item Measuring Instrument
Clock adjustment Voltmeter
Adjustment And Test Point Locations
TOP VIEW
TP6
Equipment Connection / Procedure
Clock Adjustment
TV-600
Set
Output
TP6
Input Input Input Output Output
Connection Point Signal Connection Point
Adjust Result
VR700
Voltmeter
Voltmeter
TP6
VR700
Adjust for 2.05 ± 0.05 V reading on voltmeter.
— 9 —
Loading...