Casio TV-M430S, Руководство по обслуживанию и список запасных частей

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4. COLOR adjustment
•
Condition
(1) Signal
Broadcasting system: B/G
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dB
µ
(75
Ω
termination), P/S = 10 dB
(3) Other conditions
CCIR IF input (input electric field should be terminated with 75
Ω
resistance).
Use VIDEO signal equivalent to TG7.
Power supply: VCC1-1(P105) = 13.50
±
0.05 [V]
Room temperature: 25
±
5 [
°
C]
Carry out this adjustment after the Bright, contrast adjusmtnet for 1 chip.
•
Adjustment
Adjust the color VR303 so that the amplitude of the fourth pulse of the B-output (P303) from the blank
level to its peak becomes 1.10
±
0.05 [V], which is the same level as that of white 100%.
•
Caution
(1) Perform after Contrast adjustment.
(2) VB waveform's pedestal-pedestal voltage should be fixed on 5.0
±
0.1 [V].
•
Block diagram
Oscilloscope
L-PCB
B output
VCC1-1
IF signal
Signal
generator
Stabilizer
1.10V