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Old 9th Aug 2018, 8:29 pm   #1
Join Date: Aug 2017
Location: Chester Le Street, County Durham, UK.
Posts: 28
Default Sony SL-C20 - Issue with Play FF RW


I've recently been fortunate enough to get a Sony SL-C20UB Betamax Recorder. Cosmetically it is in great condition but a bit grubby after years of storage.

After an examination, the unit powers up. It accepts a tape which laces up well.

The issue with this machine is with PLAY, FF and RW. In all cases the machine starts to work but after a couple of seconds it stops. I have visually checked the pendulum and to my eye it looks OK and engages as it should (I think) on each operation.

A separate problem which may be connected with the issue is that the tape appears to look a little slack after it has been through the pinch roller (apologies if that is a dreadful description). Also when ejected the cassette ejects from the unit but the tape is not wound tight in the cassette body and it gets very slightly caught in the mechanism and tape door.

I've seen on another site some possible causes around a silicon fuse but this is working fine.

I can only assume it has something to do with that pendulum.

If anyone has any experience of these machines and could possibly give me some pointers I would be grateful.

Many Thanks.

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Old 9th Aug 2018, 11:42 pm   #2
martin.m's Avatar
Join Date: Mar 2018
Location: Bishop Auckland, County Durham, UK.
Posts: 56
Default Re: Sony SL-C20 - Issue with Play FF RW

Hi Neil
The pendulum does cause problems on this range of VCRs. Remove and examine it carefully to make sure it is straight. Over time the plastic distorts and the whole assembly can curve upwards. The new replacements from Sony were made of thicker plastic to stop this happening. You could try straightening the pendulum by holding it with pliers and sinking it into a cup of very hot water while applying pressure for a few minutes. I've seen this done but it should only be regarded as a temporary repair. Hope this helps.

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Old 10th Aug 2018, 6:04 pm   #3
collisr's Avatar
Join Date: Oct 2016
Location: Loughton, Essex, UK.
Posts: 36
Default Re: Sony SL-C20 - Issue with Play FF RW


I recall this model also used a hall sensor in the video head stator motor. The glue holding the hall sensor in place starts to conduct after several years causing a short. If the head turns freely by hand but stops dead in fwd fwd and play then I would suspect the hall sensor.

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