Pioneer PD-S904 Service Manual page 29

PD-S904, PD-S904-G
5. Focus Servo Loop Gain Adjustment
Test mode
FOCUS servo - CLOSE
SPDL servo -— CLOSE
TRKG servo — OPEN
TEST, DISC
R=35mm
Oscilloscope
X-Y Mode
X : 20mV/div
Y : 5mV/div
Low-frequency
oscillator
1.2kHz
veg tOVECIO:1)
_Prove( 10:1)
MAIN ASSY
Test mode
FOCUS servo -+ CLOSE
SPDL servo — CLOSE
TRKG servo — OPEN
TEST, DISC
e R=35mm
pany S vrR151
MAIN ASSY
Oscilloscope
X-Y Mode
X : 5OmV/div
Y : 20mV/div
Low frequency
oscillator
1.2kHz
© 39kQ
- MAIN ASSY
Low pass filter
35