The NVHS930 is a fairly high end SVHS recorder which includes a digital timebase corrector (TBC). It is built on the Panasonic Zmechanism. 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 hifi 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 rethink about head switching
27:24 Auto PG shifter 2
29:04 Test and conclusion 2