Focus Gain Adjustment - Pioneer CJ-V55 Service Manual

CJ-V55
Step
No.
Oscilloscope Setting
Test Points
Adjusting
Points
Check items/ !
Adjustment
specifications
Adjustment procedure
V j H
8 FOCUS GAIN ADJUSTMENT
• in the POWER OFF state, connect an oscilloscope
and oscillator as shown in Fig. 7-11.
• Set' the unit to the normal PLAY mode.
• Turn the POWER of oscillator ON and output 1.2kHz
20mV/div. 5mV/div.
CHI (X). CH2 (Y)
(Probe 10 : 1)
X axis:
TP1
Pin 5
(FCS. IN)
Y axis:
TP1
Pin 6
(FCS. ERR)
VR3
(FCS.
GAN)
lVp-p.
Note: Depending upon oscillators, some of them
output DC when their power turned ON.
Therefore, it is desirable to connect oscillator
after turning the power ON.
Phase • Adjust with VR3 FCS. GAN (Focus gain) volume so
difference 90° that the lissajous figure of the oscilloscope becomes
horizontal circle (Phase difference 90°).
Photo. 7-S--- Photo. 7-10 . --Photo. 7-11
Gain overcompensated Gain optimum Gain undercompensated