Pioneer PD-F958 Service Manual page 34

PD-F958, PD-F908
QQ
3 7 63 1515 0
9. Focus Best Adjustment
Test mode
=
SPDL servo
=
FOCUS servo
=
TRKG servo
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
(CN201)
FE
RF
VC
MAIN BOARD ASSY
TE
L 13942296513
10. Focus Servo Loop Gain Adjustment
Test mode
SPDL servo
FOCUS servo
TRKG servo
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
TP1
(CN201)
6
FE
5
www FI
4
VC
MAIN BOARD ASSY
.
34
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CLOSE
CLOSE
CLOSE
MAIN BOARD ASSY
Player
TP1
6
1
4
=
CLOSE
=
CLOSE
=
CLOSE
MAIN BOARD ASSY
Player
100kΩ
0.001µF
x ao
y
i
Low pass filter 2
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8
VR156
Adjust the RF level to maximum, with
the focus error voltage within ±150mV.
Prove (10:1)
Prove (10:1)
Q Q
3 6 7 1 3
UNDER
VR152
Readjust if
adjustment
is incorrect.
Prove (10:1)
Prove (10:1)
56kΩ
u163
.
2 9 9 4 2 8
MAX
Oscilloscope
DC Mode
CH1: 5mV/div
CH2: 20mV/div
H: 200ns/div
1 5 0 5 8 2 9 9 4
Check
UPPER
JUST
Lissajous Waveform
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 5mV/div
Low-frequency
oscillator
1.2kHz
1Vp-p
m
co
GND
9 9
2 8 9 9