Sony SL-HF100 Betamax - Part 2 - No colour (Doing things the wrong way around)

This one's a little bit different insofar as we're looking at the Sony SL-HF100 Betamax with the colour issue again. In Part 1 we looked at the power supply and did a few checks and tests and in Part 2 we get down to working on the colour issue and the head drum motor issue (spoiler - it is the hall-effect device). I am so rusty on signal processing and not that experienced so getting this working and remembering/ revising my theory was really great. It starts really coming back to me towards the end of the video! I could have edited it all out but nothing like watching someone struggle... 😊 I really don't like re-capping for many reasons but thought it would be interesting to see what the results would be like and I have to say the working machine with the re-capped board has a great picture. I really confused myself too because I got it in my head that the ACK signal was low due to it being faulty when it was actually low because there actually was no colour. Another HF100 with a colour fault (plus many other faults!) coming soon on the channel. We'll also complete the work on the second YC-28. We also sort the slightly wonky display front plastic and that door. Chapters 00:00 Introduction 03:53 Colour issue investigation 05:19 Deck starts going odd! Logic 11:45 Common YC-28 board issue 12:53 Checking the YC-28 board more thoroughly 15:15 Trying a second faulty YC-28 board 33:46 Testing each PCB after recapping both boards 37:37 Testing a good YC-28 PCB 38:40 Chasing the wrong issue ACK 42:43 Swapping out the faulty swapped out CX10021B! 43:10 Further diagnosis and the fault is found! 52:02 Hall-effect THS118 and THS119 and changing it the bodgy way 01:01:13 Final testing and video capture (and repairing the front flap!) #betamax #vcr #sony #mrbetabyte