Casio EV-600B Service manual
EV-600B(NTSC)
(KX-613)
SEPT. 1997
(without price)
R
CONTENTS
SPECIFICATIONS ......................................................................................... 2
BLOCK DIAGRAM ........................................................................................ 3
TROUBLESHOOTING................................................................................... 4
PRINTED CIRCUIT BOARDS ....................................................................... 5
EXPLODED VIEW ......................................................................................... 7
PARTS LIST .................................................................................................. 8
SCHEMATIC DIAGRAMS ........................................................................... 11
WAVEFORMS.............................................................................................. 13
— 1 —
SPECIFICATIONS
Item Specification
1. Reception channels
2. Power voltage DC 6.0 V
3. Power consumption Approx. 3.8 W
4. Current consumption Approx. 630 mA
5. Battery life (with alkaline batteries) Approx. 2.0 hours
6. Power supply Car adaptor : CA-K65
7. Connection terminals External power jack : 6.0 V DC IN
VHF: 2 ~ 13 ch UHF: 14 ~ 69 ch
Batteries : 3 AA size batteries
AC adaptor : AD-K64
Earphone jack : 3.5ø mini
External antenna jack : 3.5ø mini
Audio / Video jack : 3.5ø
8. Screen size 3.0 inches
9. No. of Picture element 75,816 (234 × 324) dots
10. Dimensions 125.0 (W) × 32.0 (D) × 101.2 (H) mm
11. Weight 290 g excepting batteries
AC adaptor : AD-K65,64
12. Options Car adaptor : CA-K65
RF connector : CF-13
Antenna matching device : AS-35S
AV cord : AV-C1
— 2 —
Antenna
Power
Supply
TU200 Q200
1
Tuner
IC501
7
Tuning
Voltage
Generator
VCC2 (5.0 ± 0.02 V)
VCC7 (28.8 ± 2.9 V)
VCC6 (9.1 ± 0.5 V)
VEE1 (–20.0 ± 2.0 V)
VEE2 (–8.1 ± 0.8 V)
BLOCK DIAGRAM
IC200
24
IF Amp.
3
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
5
Chroma
Circuit
6
Display
Control
Auto-Tuning
Control
VR600
Volume
Control
IC300
IC400
IC600
Audio
Amp.
Speaker
LCD
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 M51348AVP
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.
5 — Chroma circuit: IC300 IR3P90Y
Generates the tricolor (red, green, and blue) from the video signal.
6 — Display control/Auto-tuning control: IC400 LZ93BA5
Controls the display.
7 — Tuning voltage generator: IC501 BA10358F
Generates the tuning voltage with the tuning pulse output from 6.
— 3 —
TROUBLESHOOTING
Symptom Cause Solution
No power supply Defective power switch (SW100). Replace.
No picture and
no sound
Picture OK but
no sound
No reception of
VHF or UHF
Defective DC-DC converter (T100). Replace.
Defective tuner (TU200). Replace.
Defective Q200. Replace.
Defective IC200. Replace.
Defective IC300. Replace.
Defective IC400. Replace.
Defective IC501. Replace.
Defective IC200. Replace.
Defective IC600. Replace.
Defective phone jack (JK600). Replace.
Defective tuner (TU200). Replace.
Defective IC501. Replace.
Defective power switch (SW100). Replace.
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