CX-JE5, JAX-E5 - Sony Audio Service Manual (repair manual). Page 19

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1.

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

2.

Use YEDS-18 (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.

Procedure :
1. Connect an oscilloscope to TP (FE) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search)

4. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 3 

± 0.5 Vp-p.

• Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Procedure :
1. Connect an oscilloscope to TP (RF) and TP (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF

signal level is correct or not.

BD board

Oscilloscope

TP(FE)
TP(VC)

symmetry

S-curve waveform

within 3 

±

0.5Vp-p

A

B

TP(RF)

BD board

oscilloscope

TP(VC)

Clear RF signal waveform means that the shape “ 

◊ ” can be clearly

distinguished at the center of the waveform.

Connecting Location: BD board

RF signal waveform

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 1.0 

±

0.3Vp-p

TP (VC)

TP (RF)

TP (FE)

IC721