25
1
2
3
4
1
2
3
4
C
D
F
A
B
E
PD-217
1
4
2
3. Tracking Error Balance Adjustment
Probe (10:1)
VR155
A=B
Oscilloscope
DC Mode
V: 10mV/div
H: 5mSec/div
START
TP1
(CN201)
Player
TE
VC
39k
Ω
0.001
µ
F
Low pass filter 1
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
OPEN
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
VC
A
B
GND
GND
Player
TP1
(CN201)
RF
VC
START
Probe (10:1)
Oscilloscope
AC Mode
V: 20mV/div
H: 200nSec/div
NG
OK (Smooth)
Eye pattern
4. Pickup
1
Radial
2
Tangential Direction Tilt Adjustment
MOTHER BOARD ASSY
MOTHER BOARD ASSY
MOTHER BOARD ASSY
TEST DISC
PLAY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
Position where the screw is
visible through the
adjustment hole of the float
base after moving toward the
outer peripheral.
4
Remove lock tight
1
2
2
1
TEST DISC