— 4 —
•
Conditions
(1) Apply 11.50
±
0.05 [V] on Vcc1-1.
(2) Signals: provide color bar pattern (white 75 %) composite video signal from CP196.
Signal level; 1Vp-p +/- 0.01V (75 ohm termination), conforming to NTSC-M system.
(3) Apply VDD (+5V) voltage on KILLER terminal (CP301) via 22 k
Ω
resistance.
•
Adjustment
(1) Triggering CP702 (FRP), adjust VR304 so that positive and negative pedestal level of CP706 (VB) is
10.0 +/- 0.1V.
•
Caution
(1) Make sure that waveforms are not distorted.
(2) Do not turn VR430 until contrast, tint, and color level adjustments are completed.
(3) Leave the resistor connected between CP301 (KILLER) and VDD until contrast adjustment is completed.
3. Contrast adjustment
•
Conditions
(1) Apply 11.50
±
0.05 [V] on Vcc1-1.
(2) Signals:
provide color bar pattern (white 75 %) composite video signal from CP196.
Signal level; 1Vp-p +/- 0.01V (75 ohm termination), conforming to NTSC-M system.
•
Adjustment
(1) Triggering CP702 (FRP), adjust VR301 so that CP706 (VB)’s negative and positive white peak voltage
becomes 4.75 +/- 0.1V.
•
Caution
(1) Make sure that waveforms are not distorted.
(2) Make sure to perform this adjustment after brightness adjustment.
(3) After the adjustment, remove the resistor connected between CP301 (KILLER) and VDD.
4.75
±
0.1 V
VCC1-1
IF signal
Signal
generator
Stabilizer
M-PCB
CP706
CP301
VDD (+5 V)
22 K
Ω
Oscilloscope
