Pioneer PD-M427 Servise Manual page 26

PD-M427, PD-M407
7. RF Level Adjustment
Test mode
SPDL servo
FOCUS servo
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
FOCUS servo
TRKG servo
Innermost
TEST DISC
circumference
(1 TRK)
PLAY
START
TP1
(CN201)
6
FE
5
FI
4
VC
MOTHER BOARD ASSY
26
=
CLOSE
=
CLOSE
=
CLOSE
MOTHER BOARD ASSY
Player
=
CLOSE
=
CLOSE
=
CLOSE
MOTHER BOARD ASSY
Player
100kΩ
Low pass filter 2
VR153
Make adjustment if
the value exceeds
the specified range.
Prove (10:1)
GND
UNDER
VR152
Prove (10:1)
Prove (10:1)
56kΩ
0.001µF
Check
1.2VP-P
±0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
UPPER
JUST
Lissajous Waveform
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 5mV/div
Low-frequency
oscillator
1.2kHz
1Vp-p
GND