Read Sony CDX-605 / XDC-40 (serv.man2) Service Manual online
– 15 –
SECTION 6
ELECTRICAL ADJUSTMENTS
Note:
1.
Perform adjustments as given.
2.
Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but
only when indicated.
only when indicated.
3.
Power supply voltage: DC14.4 V (more than 3A).
• FOCUS BIAS CHECK
[RF BOARD] – Conductor Side –
Procedure:
1. Connect the oscilloscope to RF board test point RF.
2. Put the set into play mode by loading the disc.
3. Confirm that oscilloscope waveform is clear and check RF
1. Connect the oscilloscope to RF board test point RF.
2. Put the set into play mode by loading the disc.
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.
guished at the center of the waveform.
• TRACKING OFFSET CHECK
[RF BOARD] – Conductor Side –
Procedure:
1. Connect the oscilloscope to RF board bridge point TE.
2. Put the set into play mode by loading the disc.
3. Press the
1. Connect the oscilloscope to RF board bridge point TE.
2. Put the set into play mode by loading the disc.
3. Press the
= AMS + button, then, check the traverse wave-
form.
4. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 V dc, and check this level.
* Traverse waveform: This is the tracking error wave form
* Traverse waveform: This is the tracking error wave form
appears when crossing the track.
TP
(VC)
IC11
IC51
CNJ12
TP (RF)
oscilloscope
+
–
–
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nsec
TIME/DIV: 500 nsec
level: 1.4
±
0.3 Vp-p
TP
(VC)
IC11
IC51
CNJ12
BP11
(TE)
oscilloscope
+
–
–
A
B
0 V
A=B
traverse waveform
(100 track jump waveform)
(100 track jump waveform)
VOLT/DIV : 500 mV
TIME/DIV : 2 msec
Center : 0 V
TIME/DIV : 2 msec
Center : 0 V
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