ZS-D50 (serv.man2) - Sony Audio Service Manual (repair manual). Page 13

– 13 –

With the OPERATE button OFF, short JW801 and JW802 on
the LCD board. (You need a moment for the short.)
The LCD display changes as in the diagram and the unit goes
into test mode.

When you press the 

^ key, the CD rotates and when you press

the 

^ key again, the CD plays (the track servo comes on)(but

no sound is issued).
Pressing the 

^ key starts automatic adjustment and the value

changes, but this value is not a problem.

[LCD BOARD] (Conductor side)

With the unit in test mode, when you press the OPERATE but-
ton to OFF, test mode ends.

Test mode PLAY status

Connection P oint :  CD/System board (Conductor side)

Check to see that the jitter is less than 9.0 nsec. and RF level is
between 0.55 – 0.85Vp-p.

Í

ALL

SOUND

MEGA BASS

cd

RF level: 
0.55–0.85 Vp-p

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

oscilloscope

(AC range)

   TP (RFO)

TP (VC)

CD TEST MODE

SHORT : TEST MODE

OPEN : NORMAL MODE