Tracking Gain Adjustment - Pioneer CJ-V55 Service Manual

:j-V55
Step
No.
Oscilloscope Setting
Test Points
V | H
Adjusting
Points
9 TRACKING GAIN ADJUSTMENT
Check items/
Adjustment
specifications
Adjustment procedure
• In the POWER OFF state, connect an oscilloscope and
oscillator as shown in Fig. 7-12.
• Set the unit to the normal PLAY mode.
• Turn the POWER of oscillator ON and output 1.2kHz
2Vp-p.
Note: Depending upon oscillators, some of them
output DC when their power turned ON.
Therefore, it is desirable to connect oscillator
50mV/div, 5mV/div.
CHI (X), CH2 (Y)
(Probe 10 :1)
X axis :
TP1
Pin 3
(TRK. IN)
Y axis :
TP1
Pin 2
(TRK. ERR)
VR4
(TRK. GAN)
after turning the power ON.
Phase • Adjust with VR4 TRK. GAN (Tracking gain) volume
difference 90° so that the lissajous figure of the oscilloscope
becomes horizontal circle (phase difference 90°).
Photo. 7-12 Photo. 7-13 Photo. 7-14
Gain overcompensated Gain optimum Gain undercompensated
100