Focus Servo Loop Gain Adjustment; Tracking Servo Loop Gain Adjustment - Pioneer DVL-919 Service Manual

DVL-919
5

Focus Servo Loop Gain Adjustment

• Test mode
• LD test disc
• Play standby
START
CLDM ASSY
FOCUS
ERR
CN802
6

Tracking Servo Loop Gain Adjustment

• Test mode
→ ON
TILT
→ ON
TRKG
• Still the LD test disc at #115.
START
CLDM ASSY
9
TRK ERR
CN802
70
CLDM ASSY
7
F IN
8
GND
CN802
Player
6
Player
CLDM
ASSY
VR604
Probe (10:1)
CLDM
ASSY
VR603
Probe (10:1)
4.8Vp-p
± 0.5V
CH1 CH2
(X) (Y)
Oscilloscope
X-Y mode
X: 
Y: 100mV/div.
DC mode
1.8Vp-p
± 0.2V
CH1 CH2
(X) (Y)
Oscilloscope
X-Y mode
X: 
Y: 50mV/div.
DC mode