Sony CDX-646 Service Manual page 15

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Tracking Offset Check
Connection:
– RF Board (Component Side) –
oscilloscope
(DC range)
+
–
Procedure:
TE
L 13942296513
1. Connect the oscilloscope to TP (TE) and TP (VC) on the RF
board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Press the . , > buttons on the master unit, and check the
traverse waveform*.
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 appears
Traverse waveform
A
0 V
B
A=B
traverse waveform
(100 track jump waveform)
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TP (VC)
IC101
TP (TE)
when crossing the track.
VOLT/DIV: 500 mV
TIME/DIV: 2 ms
Center: 0 V
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