CDP-X3000, CDP-X3000ES - Sony Audio Service Manual (repair manual). Page 3

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In general for the CD players that use a digital servo IC, the focus/
tracking gain is automatically adjusted each time a disc is changed.
In this set, the gain in test disc (YEDS-18) has been written to a
nonvolatile memory (IC803: X24C01S) on the Display Board, and
therefore the gain is not readjusted even if a disc is changed.
Accordingly, always write auto gain data when replacing the Servo
Board, IC803 on Display Board, or optical pick-up.

1) Connect CN805 1 pin (IN/OUT SW) and 6 pin (GND) on

Display Board.
Under this condition, the set will operate even when the disc lid
is open (or Key Board is not connected).

2) Connect TP (ADJ: CN105 3 pin) on Servo Board to GND, and

TP (VC: CN108 2 Pin) to TP3 (TEI: IC105 @¶ pin) with lead
wires respectively.

3) Connect an oscilloscope to TP (TE: CN108 1 pin).

4) Insert the test disc (YEDS-18), turn on POWER switch, and

play fifth music with  

·  (PLAY) and AMS Keys on the

Remocon.

5) Adjust RV101 so that the waveform on oscilloscope is verticolly

symmetric with respect to the A [Vdc], and also its level is 1.3 ±
0.6 Vp-p.

At this time, A/B 

×

 100 = ± 22 (%) or less

6) The auto gain data are written when a lead wire between TP

(ADJ: CN105 3 pin) and GND is removed.

Note: If the POWER switch was turned on without connecting TP

(ADJ) to the GND, auto gain data are not written to the
memory even if a disc is inserted, but the previous data saved
in the memory are used as focus/tracking data.

With the TP (AFJ: CN105 2 Pin) connected to the GND on Servo
Board, turn on the POWER switch, and the AF mode is activated
and the following checking can be made.

All tubes turn on, then if  

·  button is pressed, the display will be

as shown below. (Segment ON 1)

(Segment ON 1)

6

16

2

12

8

18

4

14

10

20

(Segment ON 2)

0Vdc

B

A

symmetric

level: 1.3 ± 0.6 Vp-p

IF  

P  button is pressed, the display will be as shown below. (Seg-

ment ON 2)

+
–

SERVO board

TP (TE)
TP (VC)

Oscilloscope

If STOP  

p  is pressed, all tubes turn on again.