HCD-RX33 - Sony Audio Service Manual (repair manual). Page 13

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IC03

VR02

VR01

R07

IC01

CN12

Focus Gain

Focus Bias

RF Level

1.

CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.

2.

Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10M

Ω

 impedance.

4.

Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.

5.

Adjust the focus bias adjustment when optical block is replaced.

Procedure :
1.

Connect oscilloscope to test point TP (RF) on CD DECODER
board.

2.

Turned Power switch on.

3.

Put disc (YEDS-18) in and playback.

4.

Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.

Note: Clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

oscilloscope

level: 1.0         Vp-p

VOLT/DIV: 200 mV
TIME/DIV: 500 nS

+0.3
–0.2

Adjustment Location: CD DECODER board

Procedure:
1.

Connect DC voltmeter to test point CN12 (FEO), (VC) on CD
DECODER board.

2.

Turned Power switch on.

3.

Put disc (YEDS-18) in and stop.

4.

Adjust VR01 so that the DC voitmeter reading is 0 ± 20 mV.

Adjustment Location: CD DECODER board

This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjusment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.

CD DECODER
board

CN12

FEO

VC

DC voltmeter

+

–

CD DECODER
board

TP (RF)
CN12 (VC)