Pioneer PD-F958 Service Manual page 35

11. Focus Best Adjustment
Adjust this point only if adjustment was made in item 10.
Test mode
=
SPDL servo CLOSE
=
FOCUS servo
CLOSE
=
TRKG servo
CLOSE
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
TP1
(CN201)
6
FE
1
RF
4
VC
MAIN BOARD ASSY
12. Tracking Servo Loop Gain Adjustment
Test mode
=
SPDL servo
CLOSE
=
FOCUS servo
CLOSE
=
TRKG servo CLOSE
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
TP1
(CN201)
2
TE
3
TI
4
VC
MAIN BOARD ASSY
VR156
MAIN BOARD ASSY
Player
VR151
MAIN BOARD ASSY
Player
100kΩ
PD-F958, PD-F908
Adjust the RF level to maximum, with
the focus error voltage within ±150mV.
Oscilloscope
DC Mode
CH1: 5mV/div
CH2: 20mV/div
H: 200ns/div
Prove (10:1)
Prove (10:1)
UNDER
JUST
Lissajous Waveform
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 10mV/div
Low-frequency
Prove (10:1)
oscillator
1.2kHz
1Vp-p
Prove (10:1)
GND
MAX
UPPER
35