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2. Bright, Sub-bright adjustment
IF signal
Signal
generator
VCC1-1
Stabilizer
• 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; 1 Vp-p ± 0.01V (75 ohm termination), conforming to NTSC-M system.
(3) Apply VDD (+5V) voltage on KILLER terminal (CP301) via 22 kΩ resistance.
• Adjustment
(1) Turn VR305 all the way counterclockwise.
(2) Adjust VR307 so that CP302 voltage becomes 1.83 ± 0.05 [V].
(3) Triggering with CP702 (FRPT), observe CP708 (VG) and adjust VR301 so that White – pedestal level is
2.0 ± 0.05 [V].
(4) Adjust VR305 so that neighboring lines' white – pedestal is 0.8 ± 0.05 [V].
(5) Observing CP707 (VR), adjust VR309 so that neighboring lines' white-pedestal level is 0.8 ± 0.05 [V].
(6) Observing CP706 (VB), adjust VR308 so that neighboring lines' white – pedestal level is 0.8 ± 0.05 [V].
• Caution
(1) Make sure that waveforms are not distorted.
(2) After the adjustment, remove the resistor connected between CP301 (KILLER) and VDD.
VDD (+5 V)
22 KΩ
M-PCB
CP301
CP706
CP707
CP708
— 3 —
Oscilloscope
2.30 ± 0.05 V
0.80 ± 0.05 V
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