Technical
Fault and repair guide
SL-C6ES rear view 
Rear connectors 220/240V selector, linear stereo audio in/out TV din connector |
VCR is sluggish in or fails to rewind
Internally the VCR contains many drive belts
which are used in the
mechanics of tape transport. With age these belts become slack causing
malfunctions and when this happens the whole lot should be replaced. In
particular for the rewind function you will need to replace a tyre
on the supply reel. A 'rewind' kit of replacement parts is available
from many sources.
The diagram shows the rewind spool Poor capstan lockThis causes a noise bar to appear on the picture and a wow on the sound. The first thing to check is the CTL head. If it is clean and not excessively worn then the next thing to do is to re-adjust the capstan free-run speed. This is done by adjusting RV001 on the servo board. You need to adjust until you read 5.5 +/- 0.3 V on test point TP5. If it is not possible to get a steady reading then there is a problem in the servo circuitary which is most likely caused by dried out electrolytic capacitors. Suspect C7 and C8 first but if in doubt replace all the capacitors on that area on the board.Horizontal noise bar across bottom of recored picturesThis comes about because the record servo lock adjustment drifts. What you are actually seeing is the head switching pulse on the picture. It should be hidden from view in the frame blanking period. To reset this adjustment really requires an oscilloscope but if like then you can try it by eye. The adjustments are made through RV8 on the SS-9 board.
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