Pioneer PD-M427 Service Manual page 27

1
7. RF Level Adjustment
Test mode
=
SPDL servo CLOSE
=
CLOSE
FOCUS servo
=
CLOSE
TRKG servo
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
TP1
(CN201)
1 1
RF
4
VC
MOTHER BOARD ASSY
8. Focus 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)
6
FE
5
FI
4
VC
MOTHER BOARD ASSY
1
2
VR153
MOTHER BOARD ASSY
Make adjustment if
the value exceeds
the specified range.
Player
Prove (10:1)
GND
VR152
MOTHER BOARD ASSY
Player
56kΩ
100kΩ
0.001µF
Low pass filter 2
PD-M427
2
3
Check
1.2VP-P
±0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
UNDER UPPER
JUST
Lissajous Waveform
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 5mV/div
Low-frequency
Prove (10:1)
oscillator
1.2kHz
1Vp-p
Prove (10:1)
GND
3
4
A
B
C
D
E
F
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