Casio JY-70B, JY-70C, JY-70I, JY-70N Service Manual
JY-70B (NTSC M / M)
INDEX
JY-70C (PAL B / G,H)
JY-70I (PAL B / G)
JY-70N (PAL B / G,H)
(KX-516)
(without price)
JUL . 19 98
R
CONTENTS
Page
SPECIFICATIONS.....................................................................................1
BLOCK DIAGRAM.................................................................................... 2
PRINTED CIRCUIT BOARDS...................................................................3
PARTS LIST..............................................................................................7
EXPLODED VIEW. ..................................................................................11
SCHEM A TI C DI AG RAM S..... ...... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...1 2
WAVE FO RMS........... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...... ... ...1 6
SPECIFICATIONS
Item Specification
1. Power voltage DC 6.0 V
JY-70B Approx. 3.6 W
2. Power consumption
JY-70C/N/I Approx. 3.3 W
JY-70B Approx. 600 mA
3. Current consumption
JY-70C/N/I Approx. 550 mA
JY-70B Approx. 3.5 hours
4. Battery life (with alkaline batteries)
JY-70C/N/I Approx. 4.0 hours
Batteries : 4 × LR6 (D) size batteries
5. Power supply Car adaptor : CA-K65
AC adaptor : AD-K64
Earphone jack : 3.5 ø mini
External power jack : 6.0 V DC IN
6. Connection terminal
External antenna jack : 3.5 ø mini
(only JY-70C)
Audio / Video jack : 3.5 ø mini
7. Screen size 2.3 inches
8. Number of picture elements 39,600 (360 × 110) dots
9. Dimension 126 mm (W) × 39 mm (D) × 78 mm (H)
10. Weight Approx. 220 g without batteries
Model Color System TV System Channel
JY-70B NTSC M/M US VHF: 2 ~ 13 ch UHF: 14 ~ 69 ch
JY-70C/N PAL B/G,H CCIR VHF: 2 ~ 12 ch UHF: 21 ~ 69 ch
JY-70I PAL B/G ITALY VHF: A ~ H2 ch UHF: 21 ~ 69 ch
— 1 —
Antenna
BLOCK DIAGRAM
Power
Supply
1 TU200 2 Q200
IF Amp.Tuner
7
IC500
Tuning
Voltage
Generator
VCC2 (3.95 ± 0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (– 6.03 ~ – 7.37 V)
VR800
Brightness
Control
3 IC200
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
5
6
IC300
Chroma
Circuit
IC700
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
8 Q800 ~ Q803, Q805, Q806
Display
Voltage
Generator
VR600
Volume
Control
4 IC600 Speaker
Audio
Amp.
Common
Driver
LCD
Segment
Driver
1 — Color Tuner: TU200 TEAA1(JY-70B) / TEPE5-01(JY-70C/N/I)
Selects a desired radio wave and changes it to the video IF signal.
2 — Video IF Amp.: Q200 2SC3082
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.
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 ML9661GA-6006
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 BA10358F
Generates the tuning voltage with the tuning pulse (TU) output from 6.
8 — Display Voltage Generator: Q800 ~ Q803 Q805 Q806 2SD1819A, 2SB1218A, 2SD1149S
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
— 2 —
AD-PCB(JY-70B/C/N/I)
PRINTED CIRCUIT BOARDS
Top View
Bottom View
— 3 —
L-PCB(JY-70B)
Top View
Bottom View
— 4 —
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