The NV-HS930 is a fairly high end S-VHS recorder which includes a digital timebase corrector (TBC). It is built on the Panasonic Z-mechanism. One day it worked, the next day the bottom part of the picture is covered in snow. You might think this is a tape path problem but the actual fault is much more interesting than that. Can we get it going again?

Just in case it wasn't clear from the video, the hi-fi audio was also tested both at the start (not working) and at the end (then working).

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Music “Let It Run” with permission, copyright Cristie/MacFarlane.

Sorry I do not offer an audio or video equipment repair service.


00:00 Introduction and fault
01:56 Head switching fault?
02:16 Dismantle
04:04 Test recording
05:51 Auto PG shifter 1
09:04 Heads RF output on oscilloscope
15:57 Dismantle upper head drum assembly
22:20 Conclusion 1
23:00 Big re-think about head switching
27:24 Auto PG shifter 2
29:04 Test and conclusion 2