Pioneer PD-F957 Service Manual page 33

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3 7 63 1515 0
7. RF Level Adjustment
Test mode
SPDL servo
FOCUS servo
TRKG servo
TEST DISC
START
MAIN BOARD ASSY
TE
L 13942296513
8. Focus 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
Player
TP1
(CN201)
1 1
RF
4
VC
=
CLOSE
=
CLOSE
=
CLOSE
Innermost
circumference
(1 TRK)
PLAY
MAIN BOARD ASSY
TP1
(CN201)
6
FE
5
FI
100kΩ
4
VC
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2 9
8
VR153
MAIN BOARD ASSY
Make adjustment if
the value exceeds
the specified range.
Prove (10:1)
GND
Q Q
3 6 7 1 3
VR152
Player Prove (10:1)
Prove (10:1)
56kΩ
0.001µF
.
Low pass filter 2
PD-F957,PD-F907
9 4 2 8
Check
1.2VP-P
±0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
1 5 0 5 8 2 9 9 4
UPPER
UNDER
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
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