Casio QV-780 Service Manual & Parts List page 13

3-1.VCC1 adjustment and VCC2, VCC6, VEE2, VCC0 voltage check
Apply 5.0 ± 0.05 [V] on check point CP101. (For normal check you can use an AC adaptor however,
when the camera is faulty, apply the above mentioned voltage.)
(1) Adjust VR100 so that VCC1 is 4.50 ± 0.02 [V]
(2) Check the following voltages.
VCC2 ...................... 11.5 ~ 12.5 [V]
VCC6 ...................... 17.5 ~ 19.5 [V]
VEE2 ....................... -9.5 ~ -11.5 [V]
VCC0 ...................... 2.8 ~ 3.2 [V]
(3) Turn the power off and make sure that all the voltages are 0 [V].
3-2.VCO free run frequency adjustment
• Show color bar in test mode.
• Apply 5.0 ± 0.05 [V] on check point CP101. (For normal check, AC adaptor can be used, however,
when the camera is faulty, apply the above mentioned voltage.)
• Connect check points CP725 (SYF) and CP115 (VCC0).
(1) Monitoring CP733 (HDB) with a frequency counter, adjust VR710 so that the frequency is 15.625 ±
0.1 [KHz].
(2) Disconnect CP725 and CP115 and make sure that signals of CP337 (CSY) and CP733 (HDB) are
synchronized.
Power
Supply
VCC0
QV-780
PCB K772A-L
CSY
(CP337)
HDB
SYF
(CP733)
(CP725)
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CSY
Oscilloscope
HDB
Frequency
Counter