Pioneer PD-F1007 Service Manual - Page 41

RF Level Adjustment, Focus Servo Loop Gain Adjustment

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PD-F1007 8. RF Level Adjustment Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE TEST DISC Innermost circumference PLAY (1 TRK) VR153 MAIN BOARD ASSY START TP1 (CN201) RF 1 VC 4 MAIN BOARD ASSY Player Make adjustment if the value exceeds the specified range. Prove (10:1) GND Check 1.2VP-P ±0.1V Oscilloscope AC Mode V: 50mV/div H: 10mSec/div 9. Focus Servo Loop Gain Adjustment Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE TEST DISC Innermost circumference PLAY (1 TRK) VR152 MAIN BOARD ASSY START TP1 (CN201) FE 6 FI 5 VC 4 MAIN BOARD ASSY Player 100kΩ 56kΩ 0.001µF Low pass filter 2 GND GND UNDER UPPER JUST Lissajous Waveform Oscilloscope X-Y Mode X: 20mV/div Y: 5mV/div Prove (10:1) Prove (10:1) Low-frequency oscillator 1.2kHz 1Vp-p GND 41

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PD-F1007
41
1
1
4
8. RF Level Adjustment
1.2VP-P
±
0.1V
Oscilloscope
AC Mode
V: 50mV/div
H: 10mSec/div
START
TP1
(CN201)
Player
RF
VC
GND
Prove (10:1)
9. Focus Servo Loop Gain Adjustment
UNDER
Oscilloscope
X-Y Mode
X: 20mV/div
Y: 5mV/div
GND
Prove (10:1)
Player
START
TP1
(CN201)
FI
VC
UPPER
JUST
Low-frequency
oscillator
1.2kHz
1Vp-p
GND
GND
Prove (10:1)
56k
Ω
0.001
μ
F
Low pass filter
2
100k
Ω
FE
Make adjustment if
the value exceeds
the specified range.
Check
6
5
4
Lissajous Waveform
MAIN BOARD ASSY
MAIN BOARD ASSY
VR153
MAIN BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
VR152
MAIN BOARD ASSY