Pioneer PD-F1007 Service Manual - Page 42

Focus Servo Loop Gain Adjustment, Focus Best Adjustment

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PD-F1007 10. Focus Best Adjustment Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE TEST DISC Innermost circumference PLAY (1 TRK) VR156 MAIN BOARD ASSY START TP1 (CN201) FE 6 RF 1 VC 4 MAIN BOARD ASSY Player GND GND MAX Adjust the RF level to maximum, with the focus error voltage within ±150mV. Prove (10:1) Oscilloscope DC Mode CH1: 5mV/div CH2: 20mV/div H: 200ns/div Prove (10:1) 11. Focus Servo Loop Gain Adjustment Test mode SPDL servo = CLOSE FOCUS servo = CLOSE TRKG servo = CLOSE TEST DISC Innermost circumference PLAY (1 TRK) START TP1 (CN201) FE 6 FI 5 VC 4 MAIN BOARD ASSY UNDER Check UPPER VR152 MAIN BOARD ASSY Readjust if adjustment is incorrect. JUST Lissajous Waveform Oscilloscope X-Y Mode X: 20mV/div Y: 5mV/div Player 100kΩ 56kΩ 0.001µF GND GND Prove (10:1) Prove (10:1) Low-frequency oscillator 1.2kHz 1Vp-p Low pass filter 2 GND 42

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PD-F1007
42
11. Focus Servo Loop Gain Adjustment
10. Focus Best Adjustment
Oscilloscope
DC Mode
CH1: 5mV/div
CH2: 20mV/div
H: 200ns/div
Prove (10:1)
Player
START
TP1
(CN201)
RF
VC
MAX
GND
Prove (10:1)
FE
6
1
4
GND
Readjust if
adjustment
is incorrect.
Adjust the RF level to maximum, with
the focus error voltage within
±
150mV.
MAIN BOARD ASSY
VR156
MAIN BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
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
6
5
4
Lissajous Waveform
MAIN BOARD ASSY
Test mode
SPDL servo
FOCUS servo
TRKG servo
=
=
=
CLOSE
CLOSE
CLOSE
TEST DISC
PLAY
Innermost
circumference
(1 TRK)
VR152
MAIN BOARD ASSY
Check