PD-F957,PD-F907
33
1
1
4
7. RF Level Adjustment
1.2VP-P
±
0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
START
TP1
(CN201)
Player
RF
VC
GND
Prove (10:1)
8. Focus Servo Loop Gain Adjustment
UNDER
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 5mV/div
GND
Prove (10:1)
Player
START
TP1
(CN201)
FI
VC
UPPER
JUST
Low-frequency
oscillator
1.2kHz
1Vp-p
GND
GND
Prove (10:1)
56k
Ω
0.001
µ
F
Low pass filter 2
100k
Ω
FE
Make adjustment if
the value exceeds
the specified range.
Check
6
5
4
Lissajous Waveform
MAIN BOARD ASSY
MAIN BOARD ASSY
VR153
MAIN BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
VR152
MAIN BOARD ASSY