Pioneer PD-F958 Service Manual page 35

QQ
3 7 63 1515 0
11. Focus Best Adjustment
Adjust this point only if adjustment was made in item 10.
Test mode
SPDL servo
FOCUS servo
TRKG servo
TEST DISC
START
TE
L 13942296513
12. Tracking Servo Loop Gain Adjustment
Test mode
SPDL servo
FOCUS servo
TRKG servo
TEST DISC
START
www
.
MAIN BOARD ASSY
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=
CLOSE
=
CLOSE
=
CLOSE
Innermost
circumference
(1 TRK)
PLAY
MAIN BOARD ASSY
TP1
(CN201)
6
FE
1
RF
4
VC
MAIN BOARD ASSY
=
CLOSE
=
CLOSE
=
CLOSE
Innermost
circumference
(1 TRK)
PLAY
TP1
(CN201)
2
TE
3
TI
x ao
4
VC y
i
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8
VR156
Player
Prove (10:1)
Prove (10:1)
Q Q
3 6 7 1 3
VR151
MAIN BOARD ASSY
Player Prove (10:1)
100kΩ
u163
.
PD-F958, PD-F908
2 9 9 4 2 8
MAX
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
1 5 0 5 8 2 9 9 4
UPPER
UNDER
JUST
Lissajous Waveform
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 10mV/div
Low-frequency
oscillator
1.2kHz
1Vp-p
Prove (10:1)
m
co
GND
9 9
2 8 9 9
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