CDP-C450Z, CDP-CE505 - Sony Audio Service Manual (repair manual). Page 9

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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 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M  impedance.
4. Clean the object lens using an applicator with neutral detergent

when the signal level is low than specified value with the following
checks.

Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turn Power switch on again and actuate

the focus search. (actuate the focus search when disc table is
moving in and out.)

5. Check if the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 3±1 Vp-
p.

S-curve waveform

6. After check, remove the lead wire connected in step 2.

• 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 oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check if RF signal

level is correct or not.

symmetry

oscilloscope

BD board

TP (FE)
TP (VC)

within 3 ± 1 Vp-p

oscilloscope

BD board

TP (RF)
TP (VC)

level :
1.2

  Vp-p

+0.25

–0.20

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

oscilloscope

BD board

TP (TE)
TP (VC)

Center of the waveform

A (DC voltage)

0V

B

level : 1.3 ± 0.6 Vp-p

0V

C (DC
voltage)

Clear RF signal waveform means that the shape “ ” can be
clearly distinguished at the center of the waveform.

RF signal waveform

Procedure :
1. Connect test point TP1 (ADJ) to ground with a lead wire on MAIN

board.

2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the “3” button. (The tracking servo and the sledding servo

are turned OFF.)

6. Check the level B of the oscilliscope's waveform and the A (DC

voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Traverse waveform

7. Press the “8” button. (The tracking servo and sledding servo are

turned ON.) Confirm the C (DC voltage) is almost equal to the A
(DC voltage) is step 6.

Traverse waveform

8. Disconnect the lead wire of TP (ADJ) connected in step 1.

Tracking servo
Sledding servo

OFF

Tracking servo
Sledding servo

ON

A

B