26
1
2
3
4
1
2
3
4
C
D
F
A
B
E
PD-M427
1
1
4
5. RF Level Adjustment
VR153
1.2VP-P
±
0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
START
TP1
(CN201)
Player
RF
VC
GND
Prove (10:1)
6. Focus Best Adjustment
Oscilloscope
DC Mode
CH1: 5mV/div
CH2: 20mV/div
H: 200ns/div
Prove(10:1)
Player
START
TP1
(CN201)
RF
VC
MAX
GND
Prove(10:1)
FE
6
1
4
GND
Adjust the RF level to maximum, with the
focus error voltage within
±
150mV.
MOTHER BOARD ASSY
MOTHER BOARD ASSY
MOTHER BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
VR156
MOTHER BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)