Pioneer PD-M427 Service Manual page 24

1
6.2.3 Check and Adjustment
A
1. Focus Offset Adjustment
B
START
FE
VC
C
MOTHER BOARD ASSY
2. Grating Adjustment
Test mode
D
SPDL servo
FOCUS servo
TRKG servo
TEST DISC
PLAY
E
START
TE
VC
MOTHER BOARD ASSY
F
24
1
2
Test mode
None disc
MOTHER BOARD ASSY
Player
TP1
(CN201)
6
4
Turn counterclockwise
from null.
=
CLOSE
=
CLOSE
=
OPEN
Innermost
circumference
(1 TRK)
Player
TP1
(CN201)
2
4
2
3
VR154
Prove (10:1)
GND
Locate null.
Counterclockwise, Maximum amplitude.
PICKUP
Low pass filter 1
Prove (10:1)
39kΩ
0.001µF
PD-M427
3
4
DC voltage
0±50mV
Oscilloscope
DC Mode
V: 5mV/div
H: 10mSec/div
Oscilloscope
DC Mode
V: 10mV/div
H: 5mSec/div
4