Casio EV-660C Service Manual Download Page 10 | Manualshive

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VCC1-1

AV JACK

Signal
generator

Stabilizer

EV-660C/I/N

Photo diode

S1133

Photosensor amp.

C2719

B.P.F.

Oscilloscope

8. VCOM DC adjustment

• Conditions

(1) Signals

Broadcasting system: B/G
Color system: PAL

(2) Signal:

Provide any PAL signal from AV Jack.

(3) Others

Power supply should be Vcc1-1 = 5.00

±

0.05V.

• Adjustment

Monitoring Photo sensor AMP output with an oscilloscope via 50Hz band-pass filter, adjust VCOM DC VR
(VR730) so that 50Hz ripple component is minimum.

• Caution

Perform this adjustment when you replaced the display module.
Use specified jig to replace photoelectric parts

•

Block diagram

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Summary of Contents for EV-660C

Page 1: ...R SEP 1999 EV 660 without price EV 660C PAL B G H EV 660I PAL B G EV 660N PAL B G H EV 660D PAL I KX 637 Ver 1 Feb 2000 INDEX ...

Page 2: ...CONTENTS SPECIFICATIONS 1 BLOCK DIAGRAM 2 ADJUSTMENTS 3 EV 660C I N 4 EV 660D 9 PRINTED CIRCUIT BOARDS 14 EXPLODED VIEW 16 PARTS LIST 17 SCHEMATIC DIAGRAMS 19 ...

Page 3: ... Terminals Earphone jack 3 5ø mini External power source jack DC IN 6V Audio Video input jack 3 5ø mini 10 Power Supply 3 way power supply system Batteries 4 AA size dry batteries AC AC adaptor AD K64 AD K65 option Car battery Car adaptor CA K65 option 11 Power Consumption Approx 3 8 W 12 Ambient Temperature Range 32 F 0 C 104 F 40 C 13 Dimensions 3 7 16 W 1 9 16 D 5 1 16 H inches 87 W 39 D 128 H ...

Page 4: ...MCLK BU VIDEO1 AUDIO1 ANT TUNER TEPE5 01 LCD 384 243 INVERTER TRANS C 8126 CH UPKEY CH DOWNKEY SOURCE DRIVER SOURCE DRIVER GATE DRIVER EAR PHONE SP VCC2 4 DOWN UP VCC1 1 GND VCC6 VCC5 1 VCC2 5 GND VEE1 MCLK CLR OE SRTL SRTR RESET GSRT GPCK GRES HCNT MCLK CLROESRTL SRTL SRTR RESET GSRT GPCK GRES HCNT POWER SW BAND SW AV JACK AUDIO AMP NJM2070M DC DC CONVERTER TRANS TFT CONTROLER CM7017L3 TFT CHROMA...

Page 5: ... View 1 Vcc2 adjustment Vcc7 Vcc6 Vcc5 Vee1 voltage check 2 LLD coil adjustment 3 Free running frequency adjustment 4 VOM AC and VCOM DC coarse adjustment 5 Contrast Bright adjustment 6 COLOR adjustment 7 BCC coil adjustment 8 VCOM DC adjustment Preparations 1 For the above 1 7 adjustments connect JACK to the ground GND OV Adjustment And Test Point Locations ...

Page 6: ... gain P S 10 dB 3 Other conditions CCIR IF Input electric field terminated with 75 Ω resistance As to VIDEO signal use signal source equivalent to TG7 Power supply Vcc1 1 5 00 0 05 V Adjustment Monitor video detection signal CP238 via a low pass filter of 100 kHz cutoff frequency and adjust LLD coil T200 so that its DC level is minimum waveform s amplitude is maximum Confirmation There should be n...

Page 7: ...SYF terminal Applying IF signal make sure that synchronization is normal on the display Block diagram L PCB SYF GND HDB Frequency Counter VCC1 1 IF signal Signal generator Stabilizer 4 VCOM AC and VCOM DC coarse adjustment Conditions 1 Signals Broadcasting system B G Color system PAL color bar 2 Signal level Input electric field 70 3dBµ terminated with 75Ω resistance P S 10 dB 3 Others CCIR IF inp...

Page 8: ...urce equivalent to TG7 Supplying power should be VCC1 1 5 00 0 05 V Adjustment 1 Apply VCC2 3 CP344 voltage on KILLER terminal CP308 via 22 kΩ resistance 2 Triggering FRP signal CP711 observe VB waveform CP324 and adjust BRIGHT VR so that pedes tal pedestal voltage becomes 5 0 0 1 V 3 Adjust VR303 so that VB CP324 waveform s pedestal white peak voltage is 3 5 0 1 V Caution 1 Make sure that wavefor...

Page 9: ...n 5 0 0 1 V Block diagram VCC1 1 IF signal Signal generator Stabilizer L PCB B output Oscilloscope 3 5 Vp p 7 BCC coil adjustment Condition 1 Signal Broadcasting system B G Color system PAL color bar 2 Signal level Input electric field 70 3 dBµ 75Ω termination P S 10 dB 3 Other conditions CCIR IF input input electric field should be terminated with 75Ω resistance Use VIDEO signal equivalent to TG7...

Page 10: ...stem PAL 2 Signal Provide any PAL signal from AV Jack 3 Others Power supply should be Vcc1 1 5 00 0 05V Adjustment Monitoring Photo sensor AMP output with an oscilloscope via 50Hz band pass filter adjust VCOM DC VR VR730 so that 50Hz ripple component is minimum Caution Perform this adjustment when you replaced the display module Use specified jig to replace photoelectric parts Block diagram ...

Page 11: ...ain P S 7 dB 3 Other conditions UK IF Input electric field terminated with 75 Ω resistance As to VIDEO signal use signal source equivalent to TG7 Power supply Vcc1 1 5 00 0 05 V Adjustment Monitor video detection signal CP238 via a low pass filter of 100 kHz cutoff frequency and adjust LLD coil T200 so that its DC level is minimum waveform s amplitude is maximum Confirmation There should be no wav...

Page 12: ... SYF terminal Applying IF signal make sure that synchronization is normal on the display Block diagram L PCB SYF GND HDB Frequency Counter VCC1 1 IF signal Signal generator Stabilizer 4 VCOM AC and VCOM DC coarse adjustment Conditions 1 Signals Broadcasting system I Color system PAL color bar 2 Signal level Input electric field 70 3dBµ terminated with 75Ω resistance P S 7 dB 3 Others UK IF input i...

Page 13: ...ce equivalent to TG7 Supplying power should be VCC1 1 5 00 0 05 V Adjustment 1 Apply VCC2 3 CP344 voltage on KILLER terminal CP308 via 22 kΩ resistance 2 Triggering FRP signal CP711 observe VB waveform CP324 and adjust BRIGHT VR so that pedes tal pedestal voltage becomes 5 0 0 1 V 3 Adjust VR303 so that VB CP324 waveform s pedestal white peak voltage is 3 5 0 1 V Caution 1 Make sure that waveforms...

Page 14: ...n 5 0 0 1 V Block diagram VCC1 1 IF signal Signal generator Stabilizer L PCB B output Oscilloscope 3 5 Vp p 7 BCC coil adjustment Condition 1 Signal Broadcasting system I Color system PAL color bar 2 Signal level Input electric field 70 3 dBµ 75Ω termination P S 7 dB 3 Other conditions UK IF input input electric field should be terminated with 75Ω resistance Use VIDEO signal equivalent to TG7 Appl...

Page 15: ...m PAL 2 Signal Provide any PAL signal from AV Jack 3 Others Power supply should be Vcc1 1 5 00 0 05V Adjustment Monitoring Photo sensor AMP output with an oscilloscope via 50Hz band pass filter adjust VCOM DC VR VR730 so that 50Hz ripple component is minimum Caution Perform this adjustment when you replaced the display module Use specified jig to replace photoelectric parts Block diagram ...

Page 16: ... 14 PRINTED CIRCUIT BOARDS TOP VIEWS Linear Back Light ...

Page 17: ... 15 BOTTOM VIEWS Linear Back Light ...

Page 18: ... 16 EXPLODED VIEW 9 9 1 2 3 7 S1 30 32 33 34 35 36 40 41 39 44 29 43 37 42 42 43 31 11 6 5 4 12 24 13 S3 27 28 14 S2 23 22 S2 15 S5 7 10 8 S2 17 18 26 29 21 20 19 16 S2 S4 45 38 S1 S1 25 ...

Page 19: ... 16 1001 1338 Rating plate DAM K637 K341673 6 EV 660D 1 AA X N 16 6614 3740 Rating plate IAM K637 K341673 4 EV 660I 1 AB X N 16 6614 3730 Rating plate NCM K637 K341673 3 EV 660N 1 AB X 17 6614 3010 Battery coverBXM K637 K140613 1 Common 1 AA C N 18 6614 3030 Cushion B K637 K441851 1 Common 1 AA C 19 6614 3020 Stand BXM K637 K140614 1 Common 1 AA C 20 6614 3120 Battery holder A K637 K241201 1 Commo...

Page 20: ...2 3 Common 2 AA X N 44 6614 3670 Sealed plate A K637 K441788 1 Common 1 AA X 45 6607 0690 Insulation plate D K508 K410441 3 Common 1 AA X S1 5860 0420 Screw BT3 1 7X4 NI Common 4 AA X S2 5860 1449 Screw BT3 1 7X8 BK Common 4 AA X S3 6604 3110 Screw K41310 1 Common 1 AA X S4 6609 1290 Screw A K610 K412031 1 Common 1 AA X S5 6630 7430 Screw A K618 K440305 1 Common 3 AA X Note Q Quantity per unit R R...

Page 21: ... N Power Supply Circuit Power Switch External Antenna Jack Earphone Jack Tunner Speaker AC Jack 25 0 30 0 V 12 0 10 0 V 18 0 20 0 V 4 8 0 02 V 11 0 13 0 V Display Controller Circuit Chroma Circuit IF Detection Circuit Audio Amplifier Circuit ...

Page 22: ...er Switch External Antenna Jack Earphone Jack Tunner Speaker AC Jack 25 0 30 0 V 12 0 10 0 V 18 0 20 0 V 4 8 0 02 V 11 0 13 0 V Display Controller Circuit Chroma Circuit IF Detection Circuit Audio Amplifier Circuit LINEAR EV 660D ...

Page 23: ... 21 BACK LIGHT ...

Page 24: ...CASIO TECHNO CO LTD Overseas Service Division Nishi Shinjuku Kimuraya Bldg 1F 5 25 Nishi Shinjuku 7 Chome Shinjuku ku Tokyo 160 0023 Japan Ver 1 PARTS LIST P 17 was changed ...

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