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Focus Diode · 7th Sep 2018, 5:54 pm

Never thought I could get stuck with one of these sets.

This Ferguson 3645 16" model which landed today was found to have a blown 1.5A mains fuse. Simple I thought, probably a shorted mains filter capacitor or HT rectifier.

Initially I thought the HT rectifier was s/c. Not so as it measured fine when removed. Re-fit it, snip the mains filter. Fuse blows instantly!

Replace the HT rectifier just incase. Same thing happens.

The protection capacitor across the rectifier is ok.

Any ideas? It's of course impossible to make voltage readings with the fuse blowing instantly.

7th Sep 2018, 5:54 pm	#1
Focus Diode Octode Join Date: Jan 2006 Location: Borough of Gateshead, UK. Posts: 1,420	Stuck on a BRC 1400! Never thought I could get stuck with one of these sets. This Ferguson 3645 16" model which landed today was found to have a blown 1.5A mains fuse. Simple I thought, probably a shorted mains filter capacitor or HT rectifier. Initially I thought the HT rectifier was s/c. Not so as it measured fine when removed. Re-fit it, snip the mains filter. Fuse blows instantly! Replace the HT rectifier just incase. Same thing happens. The protection capacitor across the rectifier is ok. Any ideas? It's of course impossible to make voltage readings with the fuse blowing instantly. Attached Thumbnails