TV Repair Questions? Ask a TV Technician for Answers ASAP
I have tried running a brand new cassette as suggested and there seems to be a marginal change, but still no picture. I will be trying to get a proper cleaning kit over the next few days and I will let you know how I get on.
You will be pleased to know that your diagnosis was correct. I purchased a head cleaning kit from my local Maplin for about £5, cleaned the heads as instructed and my machine now works perfectly, both playing and recording sound and picture.