Sony CDP-CX235 - Troubleshooting Using the RFO Waveform

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Troubleshooting Using the RFO Waveform
Normal RFO (“Eye”) pattern
1.2Vp-p
Time base = 0.5usec/div.
Normal RFO in-between songs
1.2Vp-p
Time base = 0.5usec/div.
RFO during PB of a scratched
disc. Notches in the envelope
appear on top and sometimes
bottom.
1.2Vp-p
Time base = 0.5msec/div.
RFO when the tracking servo is
open (defective).
1.3Vp-p
1msec/div.
RFO when the spindle motor is bad. The
motor’s worn bushing causes vibration
that upsets the tracking servo. This
causes the scalloping along the bottom
of the waveform