SONY ZSD55
Service Manual

SECTION 4 TEST MODE
CD SECTION
1. Entering CD test mode Connect power supply cord or insert dry batteries, short Test point (TEST-1) on the key board. (You need a moment for the short) (Power button is possible with both of ON or OFF to enter test mode).
R602

RF LEVEL and jitter check Test mode PLAY status Connection Point : CD board (Conductor side)
[CD BOARD] (Conductor side)

z

oscilloscope (AC range)
TP(RF)

The LCD display changes as in the diagram and the unit goes into test mode.
JW609

TP (RF) JW741 (VC)

cd

MEGA BASS

PGM

h

When you press the u key, the CD rotates and when you press theu key again, the CD plays (the track servo comes on) (but no sound is issued). Pressing the u key starts automatic adjustment and the value changes, but ignore this value.
[KEY BOARD] (Conductor side)
R607
R606

IC701
Check to see that the jitter is less than 9.0 nsec. and RF level is between 0.7 � 1.1Vp-p.

TEST-1

VOLT/DIV : 200mV (using 10:1 probe) TIME/DIV : 500ns

JW610

2. Exiting test mode With the unit in test mode, when you press the POWER button to OFF, power is off and test mode ends.

JW606

Q603

4

CN806

R603 1 R605 R604 S618

x

D602

x

TEST-1 SHORT : TEST MODE OPEN : NORMAL MODE
D603

RF level: 0.7�1.1 Vp-p

ECB

BAND 11 (11)

1-678-260-

� 17 �