CDX-715 - Sony Car Audio Service Manual (repair manual). Page 17

– 19 –

– 20 –

1.

Perform adjustments as given.

2.

Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but
only when indicated.

3.

Power supply voltage: DC14.4 V (more than 3A).

[RF  BOARD]  – Conductor Side –

Procedure:
1. Connect the oscilloscope to RF board test point RF.
2. Put the set into play mode by loading the disc.
3. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

Clear RF signal waveform means that the shape “≈” can be clearly distin-
guished at the center of the waveform.

TP

(VC)

IC11

IC51

CNJ12

TP (RF)

oscilloscope

+
–

[RF  BOARD]  – Conductor Side –

Procedure:
1. Connect the oscilloscope to RF board bridge point TE.
2. Put the set into play mode by loading the disc.
3. Press the 

= AMS + button, then, check the traverse wave-

form.

4. Confirm that the oscilloscope waveform is symmetrical on the

top and bottom in relation to 0 V dc, and check this level.
* Traverse waveform: This is the tracking error wave form

appears when crossing the track.

RF signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 nsec

level: 1.4 

±

 0.3 Vp-p

TP

(VC)

IC11

IC51

CNJ12

BP11

(TE)

oscilloscope

+
–

A

B 

0 V

A=B

traverse waveform
(100 track jump waveform)

VOLT/DIV : 500 mV
TIME/DIV : 2 msec
Center : 0 V

This adjustment is to be performed when replacing the following
parts.
• Optical Pick-up Block
• RV14

[RF  BOARD]  – Conductor Side –

Procedure:
1. Set RV14 (RF board) to the standard position.
2. Check that there is not an abnormal amount of operation noise

(white noise) from the 2-axis devise. If there is, turn RV14
slightly clockwise.

[RF  BOARD]  – Conductor Side –

RV14

IC11

IC51

CNJ12

The set does not play because of no focus operation.

Operation noise is heard due to a scratch or a dust, then opera-
tion will be unstable.

MIN side
(low gain)

MAX side
(high gain)

RV14 standard position