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Casio EV-660C Service Manual page 14

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6. COLOR 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.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust VR300 so that 4th pulse of VB waveform's (CP324) pedestal-peak amplitude is 3.5 Vp-p.
• Caution
(1) Perform after Contrast adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
Signal
generator
Stabilizer
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.
Apply voltage of Vcc1-1 = 5.00 ± 0.05 [V]
• Adjustment
Adjust BCC coil (T300) so that center 2 pulses of VB waveform (CP324) become level (3.5 ± 0.1 [V].)
• Caution
(1) Perform after COLOR adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0 ± 0.1 [V].
• Block diagram
Signal
generator
Stabilizer
L-PCB
IF signal
B output
VCC1-1
L-PCB
IF signal
B output
VCC1-1
— 12 —
3.5 Vp-p
Oscilloscope
Oscilloscope

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