Electrical Check - Sony CDX-540RF Manuel De Service

Note:
1. This adjustment is performed with the set placed horizontally.
2. Power supply voltage: DC14.4 V (more than 3 A).
3. Be sure to use the disc "YEDS-18" parts code: 3-702-101-01, but only
when indicated.
Connection:
power supply
(DC 14.4 V)
+
GND
wired remote commander
(RM-X80RF)
DISPLAY connector (CN302)
SECTION 6

ELECTRICAL CHECK

POWER connector (CN303)
compact disc changer
FOCUS BIAS CHECK
Connection:
– RF BOARD (Component Side) –
oscilloscope
(AC range)
+
–
TP (VC)
IC101
TP
(RFO)
Procedure:
1. Connect the oscilloscope to TP (RFO) and TP (VC) on the RF
board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note:
Clear RF signal waveform means that the shape "◊" can be clearly distin-
guished at the center of the waveform.
RF signal waveform
When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(10 : 1 probe in use)
level: 1.4 ± 0.3 Vp-p
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