CX-JE3, JAX-E3 - Sony Audio Service Manual (repair manual). Page 17

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• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the pickup.

Procedure:
1. In the status where AC plug is disconnected, while pressing

the 

[CD]

 button, connect the AC plug to turn the power on.

2. When enter this mode, it displays “CD TEST” and few sec-

onds later, all segments turn on of the fluorescent indicator
tube.

3. To release from this mode, disconnect the AC plug and turn

the power off.

In this mode, it operates as following table.

Button

Operation

Purpose of use

M

Move the pick-up to outside track

Sled circuit check

m

Move the pick-up to inside track

Tracking circuit check

Mechanism operation check

Optical pick-up check

N

Playback a CD

Servo block check

If it cannot focus on, it continuous focus search

x

When playback a CD: stop playback

APC circuit check

When stop a CD:

Laser current measure

display “READING” (blink)

Focus search waveform check

continuous laser diode on

Tracking balance check

continuous focus search (not made focus on)

X

Pause, Tracking servo off

(ignore CLV error)

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 : 1.3 

±

0.3Vp-p

TP (RF)

TP (VC)
TP (FE)

IC721