Casio JY-70B Troubleshooting guide

R
JY-70B (NTSC M / M)
JY-70C (PAL B / G,H)
JY-70I (PAL B / G)
JY-70N (PAL B / G,H)
(KX-516)
(without price)
JUL. 1998
INDEX

CONTENTS
Page
SPECIFICATIONS.....................................................................................1
BLOCK DIAGRAM.................................................................................... 2
PRINTED CIRCUIT BOARDS...................................................................3
PARTS LIST..............................................................................................7
EXPLODED VIEW...................................................................................11
SCHEMATIC DIAGRAMS.......................................................................12
WAVEFORMS.........................................................................................16

— 1 —
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
SPECIFICATIONS
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

— 2 —
Antenna
1 TU200 2 Q200 3 IC200
7
Tuning
Voltage
Generator
VR600
Volume
Control
4 IC600 Speaker
IC300
IC700
Common
Driver LCD
Segment
Driver
Chroma
Circuit
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
5
6
8 Q800 ~ Q803, Q805, Q806
VR800 Display
Voltage
Generator
Brightness
Control
VCC2 (3.95 ±0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (– 6.03 ~ – 7.37 V)
IC500
Power
Supply
Audio
Amp.
IF Amp.Tuner
Video
Sound Det.
FM
AFT Circuit
AGC Circuit
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
EliminatesthecarrierwaveinthevideoIFsignal,andpicksupthevideosignalandthesoundIFsignal.
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.
BLOCK DIAGRAM

— 3 —
PRINTED CIRCUIT BOARDS
AD-PCB(JY-70B/C/N/I)
Top View
Bottom View

— 4 —
L-PCB(JY-70B)
Top View
Bottom View

— 5 —
L-PCB(JY-70C/N/I)
Top View
Bottom View

— 6 —
BL-PCB(JY-70B/C/N/I)
Top View
Bottom View

PARTS LIST JY-70B: NTSC (USA,Others)
JY-70C: PAL (Others)
JY-70I: PAL (Itary)
AD
PCB
ASS'Y
JY-70N: PAL (Europe,Germany)
Item Code No. Parts Name Specification Applicable Q R
Connector
3502 2214 CONNECTOR 52435-2291 JY-70 common 1 X
3502 2425 CONNECTOR 52271-1490 JY-70 common 1 X
3502 2426 CONNECTOR 52288-0211 JY-70 common 1 X
ICs
2012 6038 LSI ML9661GA-6006 JY-70 common 1 C
2114 2464 IC / LINEAR NJM2070M-T1 JY-70 common 1 C
2114 3311 IC / LINEAR M52045FP-T1 JY-70C/I/N common 1 C
2114 3458 IC S-81230SG-QB-T1 JY-70 common 1 C
2114 5853 IC TK11239BMCL JY-70B common 1 C
2116 0119 IC BA10358F-T1 JY-70 common 1 C
Jacks
3501 3773 JACK HSJ6063-01-410 JY-70 common 1 C
3501 5439 JACK HSJ1456-01-210 JY-70 common 1 C
Transistors
2251 0189 TRANSISTOR / CHIP 2SB1218A-R(TX) JY-70 common 2 B
2253 0133 TRANSISTOR / CHIP 2SD1819A-R(TX) JY-70 common 2 B
2253 0476 TRANSISTOR / CHIP 2SD1149-S(TX) JY-70 common 1 B
Switch
3412 1848 SWITCH / TACT SKQGAA JY-70 common 1 C
Variable Resistors
2765 0616 VOLUME RK09H11T-10KB JY-70 common 1 C
2765 0623 VOLUME RK09H11T-20KB JY-70 common 1 C
Oscillator
2590 2717 OSCILLATOR HD-49-4.43M JY-70C/I/N common 1 C
2590 2731 OSCILLATOR HD-49-3.58M JY-70B common 1 C
Notes : Q - Quantity used per unit
R - Rank — 7 —

LINEAR PCB
Item Code No. Parts Name Specification Applicable Q R
Diodes
2390 1183 DIODE / CHIP MA143A-(TX) JY-70B common 1 C
2390 1190 DIODE ERA15-01Y JY-70 common 1 C
2390 1470 DIODE / CHIP MA142WK-(TX) JY-70 common 1 C
7101 1194 DIODE / CHIP MA111(TX) JY-70B common 3 C
7101 1194 DIODE / CHIP MA111(TX) JY-70C/I/N common 2 C
Fuse
2797 5598 FUSE / CHIP PI-R429.750 JY-70 common 1 B
ICs
2114 1827 IC / LINEAR M51348FP-T1 JY-70 common 1 C
2114 3150 IC MB3776APNF-EF JY-70 common 1 C
2114 5853 IC TK112939BMCL JY-70B common 1 C
Jacks
3501 5439 JACK HSJ1456-01-210 JY-70 common 1 C
3501 8281 JACK HEC0811-010010 JY-70 common 1 C
Transistors
2251 0189 TRANSISTOR / CHIP 2SB1218A-R(TX) JY-70B common 2 B
2252 1050 TRANSISTOR / CHIP 2SC3082K-T146Q JY-70 common 1 B
2253 0133 TRANSISTOR / CHIP 2SD1819A-R(TX) JY-70B common 4 B
2253 0133 TRANSISTOR / CHIP 2SD1819A-R(TX) JY-70C/I/N common 1 B
2253 0308 TRANSISTOR / CHIP 2SD1119-R(TX) JY-70 common 1 B
Switch
3412 0938 SWITCH / SLIDE ESD11V231 JY-70 common 1 C
Converter
3065 0715 CONVERTER / DC-DC LC128-16 JY-70B common 1 B
3065 0672 CONVERTER / DC-DC LC12U-40 JY-70C/I/N common 1 B
Tuner
1014 9890 TUNER TEAA1-001A JY-70B common 1 C
1013 5315 TUNER TEPE5-01 JY-70C/I/N common 1 C
BL PCB ASS'Y
Item Code No. Parts Name Specification Applicable Q R
Transistors
2253 0287 TRANSISTOR 2SD965-R JY-70 common 1 B
Transformer
3012 1588 INVERTER TRANS C-8123 JY-70 common 1 B
Notes : Q - Quantity used per unit
R - Rank — 8 —

COMPONENT
Item Code No. Parts Name Specification Applicable Q R
1 6613 1891 PCB ASSY / LINEAR / A/D K341072*2 JY-70B common 1 B
1 6613 2866 PCB ASSY / LINEAR / A/D K341072*3 JY-70C/N/I common 1 B
2 6613 1895 CASE / UPPER /GREEN K240876*2 JY-70B/C/N common 1 C
2 6613 1896 CASE / UPPER / ORANGE K240876*3 JY-70B/C/N common 1 C
2 6613 2859 CASE / UPPER / GREEN K240876*4 JY-70I common 1 C
2 6613 2861 CASE / UPPER / ORANGE K240876*5 JY-70I common 1 C
2 6614 1927 CASE / UPPER / YELLOW K240876*11 JY-70B 1 C
3 2725 1348 LCD MODULE CMG23CO-TO JY-70 common 1 B
4 3851 2093 LAMP / FLUORESCENCE 3064BB-CA48 JY-70 common 1 A
4-1 6612 9720 CASE / REFLECTOR K140418-1 JY-70 common 1 X
5 6613 0003 PCB ASSY / BL K341109*1 JY-70 common 1 B
5-1 6612 9930 CABLE / BL K441248-1 JY-70 common 1 X
6 6612 9730 PLATE / DIFFUSION K340975-1 JY-70 common 1 X
7 6613 1910 PLATE / DISPLAY K340978-2 JY-70B common 1 X
7 6613 2910 PLATE / DISPLAY K340978-3 JY-70C common 1 X
7 6613 2920 PLATE / DISPLAY K340978-4 JY-70I/N common 1 X
7 6614 1950 PLATE / DISPLAY / YELLOW K340978-7 JY-70B 1 X
8 6612 9680 KNOB / POWER / FOR GREEN K340972-1 JY-70 common 1 C
8 6613 2090 KNOB / POWER / FOR ORANGE K340972-2 JY-70 common 1 C
8 6614 2060 KNOB / POWER / FOR YELLOW K340972-4 JY-70B 1 C
8-1 6612 9790 SLIDER /SWITCH K240804-1 JY-70 common 1 C
8-2 6612 9800 RAIL / SWITCH / FOR GREEN K240805-1 JY-70 common 1 X
8-2 6613 2100 RAIL / SWITCH / FOR ORANGE K240805-2 JY-70 common 1 X
8-2 6614 2070 RAIL / SWITCH / FOR YELLOW K240805-4 JY-70B 1 X
9 6612 9690 BUTTON / TUNING / FOR GREEN K340973-1 JY-70 common 1 C
9 6613 2070 BUTTON / TUNING / FOR ORANGE K340973-2 JY-70 common 1 C
9 6614 2040 BUTTON / TUNING / FOR YELLOW K340973-4 JY-70B 1 C
9-1 6612 9710 GUIDE / TUNING BUTTON / FOR GREEN K340974-1 JY-70 common 1 X
9-1 6613 2080 GUIDE / TUNING BUTTON / FOR ORANGE K340974-2 JY-70 common 1 X
9-1 6614 2050 GUIDE / TUNING BUTTON / FOR YELLOW K340974-4 JY-70B 1 X
10 3831 1078 SPEAKER T028S14A0020 JY-70 common 1 C
11 6612 9921 CABLE / FLAT K441247A-1 JY-70 common 1 X
12 3851 2091 ANTENNA / STRAP / FOR GREEN SA-1310-1 JY-70 common 1 C
12 3851 2100 ANTENNA / STRAP / FOR ORANGE SA-1310-2 JY-70 common 1 C
12 3851 2119 ANTENNA / STRAP / FOR YELLOW SA-1310-4 JY-70B 1 C
13 6612 9700 COVER / ANTENNA / GREEN K240800-1 JY-70 common 1 X
13 6613 2180 COVER / ANTENNA / ORANGE K240800-2 JY-70 common 1 X
13 6614 2080 COVER / ANTENNA / YELLOW K240800-5 JY-70B 1 X
14 6613 0140 CAP / DISPLAY / GREEN K341063*1 JY-70 common 1 C
14 6613 2900 CAP / DISPLAY / ORANGE K341063*2 JY-70 common 1 C
14 6614 1930 CAP / DISPLAY / YELLOW K341063B*5 JY-70B 1 C
15 6612 9880 CORD / CAP / FOR GREEN K441265*1 JY-70 common 1 X
15 6613 1900 CORD / CAP / FOR ORANGE K441265*2 JY-70 common 1 X
15 6614 1780 CORD / CAP / FOR YELLOW K441265*3 JY-70B 1 X
16 6612 9660 GRIP / FOR GREEN K240798-1 JY-70B/C/N common 1 X
16 6613 2110 GRIP / FOR ORANGE K240798-2 JY-70B/C/N common 1 X
16 6613 3080 GRIP / FOR GREEN K240798-3 JY-70I common 1 X
16 6613 3090 GRIP / FOR ORANGE K240798-4 JY-70I common 1 X
16 6614 1990 GRIP / FOR YELLOW K240798-6 JY-70B 1 X
17 6612 9840 HOOK / STRAP K340980-1 JY-70 common 2 X
17 6612 9841 HOOK / STRAP / YELLOW K340980A-1 JY-70B 2 X
Notes : Q - Quantity used per unit
R - Rank
— 9 —

Item Code No. Parts Name Specification Applicable Q R
18 6613 0123 CASE / LOWER / GREEN K240868*1 JY-70 common 1 X
18 6613 1888 CASE / LOWER / ORANGE K240868*2 JY-70 common 1 X
18 6614 1923 CASE / LOWER / YELLOW K240868B*7 JY-70B 1 X
18-1 6609 9061 SPRING / BATTERY K440159A-1 JY-70 common 1 X
18-2 6609 9071 SPRING / BATTERY K440243A-1 JY-70 common 1 X
18-3 6020 7658 SPRING / BATTERY P408A-1 JY-70 common 1 X
18-4 6020 7666 SPRING / BATTERY P409A-1 JY-70 common 1 X
19 6612 9630 COVER / BATTERY K240797-1 JY-70 common 1 C
19 6614 1940 COVER / BATTERY / YELLOW K240797A-3 JY-70B 1 C
20 6612 9740 STAND / GREEN K340976-1 JY-70 common 1 C
20 6613 2170 STAND / ORANGE K340976-2 JY-70 common 1 C
20 6614 2010 STAND / YELLOW K340976-5 JY-70B 1 C
21 6612 9750 HOLDER / STAND K340977-1 JY-70 common 1 X
6609 9680 COVER / JACK K340237-1 JY-70B/I/N common 1 C
6608 0922 LABEL K411564B-2 JY-70B common 1 X
6613 1920 PLATE / RATING / GREEN K441267-2 JY-70B common 1 X
6613 1930 PLATE / RATING / ORANGE K441267-3 JY-70B common 1 X
6614 1960 PLATE / RATING / YELLOW K441584-14 JY-70B 1 X
6613 1940 LABEL K441486-1 JY-70 common 1 X
6613 1941 LABEL K441486A-1 JY-70B 1 X
E1 5861 3683 E-RING E-1.5 JY-70 common 2 X
S1 5860 3381 SCREW PS3 1.7X4 BK JY-70 common 2 X
S2 5860 0420 SCREW BT3 1.7X4 NI JY-70 common 8 X
S3 5860 3549 SCREW BT3 1.7X10 NI JY-70 common 2 X
S4 6604 9980 SCREW K410188-1 JY-70 common 2 X
S5 6630 7430 SCREW K440305-1 JY-70 common 3 X
Notes : Q - Quantity used per unit
R - Rank — 10 —

— 11 —
EXPLODED VIEW
14
3
6
S2
S2 1
S2
S3
S4
21
12
11
15
17
16
7
S1
10
E1
2
18
S2
19
S2
E1
17
5
8
4
S5
S2
20
S2
13
9
18-4
4-1
9-1
18-3
18-1
18-2
5-1
8-1
8-2

— 12 —
SCHEMATIC DIAGRAMS
AD CIRCUIT
AD-CIR-K0516 (JY-70B/C/N/I)
10
12
11
4
8
7 6 5
Chroma Circuit
A/V Jack
Tuning Voltage Generator
Circuit
Audio Amplitier Circuit
Speaker
Earphone
Jack
To L-PCB To BL-PCB
Display Voltage Generator
Circuit
To LCD
Display Controller
Circuit

— 13 —
LINEAR CIRCUIT
L-CIR-K0516 (JY-70B)
12
3
IF Pad
External
Antenna
Jack
Tuner
DC in
IF Detection Circuit
Power Supply Circuit
To AD-PCB
To
Batteries
9

— 14 —
LINEAR CIRCUIT
L-CIR-K0516 (JY-70C/N/I)
12
3
IF Pad
External
Antenna
Jack
Tuner
DC in
IF Detection Circuit
Power Supply Circuit
To AD-PCB
To
Batteries
9

— 15 —
BACK LIGHT CIRCUIT
BL-CIR-K0516 (JY-70B/C/N/I)

— 16 —
WAVEFORMS
3.0 mV
3.0 V
63.5 µs 63.5 µs63.5 µs
160 mV
12 V
3.2 V
540 ns
1Q200 Collector 2IC200 Pins 19, 20
5IC300 Pins 10, 11, 12
3IC200 Pin 18
6IC300 Pin 5
9Q111 Collector
4IC300 Pin 23
0IC700 Pin 9 BIC700 Pin 8AQ806 Base
8IC300 Pin 17IC300 Pin 4
0.6 V
0.24 µs
3.3 V
63.5 µs
1.4 V
63.5 µs
0.9 V
63.5 µs63.5 µs8.5 µs
130 µs63.5 µs
600 mV
3.2 V
750 mV

CASIO TECHNO CO.,LTD.
Overseas Service Division
8-11-10, Nishi-Shinjuku
Shinjuku-ku, Tokyo 160-0023, Japan