14
CDX-T69/T69X
GND
+
BUS cable
compact disc changer
master unit
power supply
(DC 14.4 V)
SECTION 4
ELECTRICAL CHECK
Note:
1. This check 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:
FOCUS BIAS CHECK
Connection:
– RF Board (Component Side) –
Procedure:
1. Connect the oscilloscope to TP (RFAC) 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 sig-
nal 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.
When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(10 : 1 probe in use)
level: 1.4
+ 0.3
Vp-p
– 0.4
oscilloscope
(AC range)
+
–
TP (VC)TP (RFAC)
IC101
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