Pioneer PD-S904-G Service Manual - Page 29

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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

R=35mm

pany

S vrR151

MAIN ASSY

Oscilloscope

X-Y Mode

X : 5OmV/div

Y : 20mV/div

Low frequency

oscillator

1.2kHz

MAIN ASSY

Low pass filter