Casio SY-20B, Руководство по обслуживанию, Страница: 9 / 19

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5. TINT adjustment
•
Condition
(1) Signal
Broadcasting system: M/M
Color system: NTSC color bar (white 75%)
(2) Signal level
Input electric field: 70
±
3 dB
µ
(75
Ω
termination), P/S = 10 dB
(3) Other conditions
US IF input (input electric field should be terminated with 75
Ω
resistance).
Power suppiy : Vcc1-1 (CP101) = 5.00
±
0.05 [V]
•
Adjustment
Observing B output signal (CP740) with an oscilloscope, adjust TINT pot VR301 so that amplitude difference
between two center pulses is 0.1 [V]
•
Caution
(1) Do not connect COLOR chroma IC (M52042PP) terminal of to GND.
(2) Monitor B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R =100
Ω
)
•
Block diagram
VCC1-1
IF signal
Signal
generator
Stabilizer
L-PCB
B output
Oscilloscope
Low-pass filter