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Old 19th Oct 2020, 4:29 pm   #14
RogerEvans
Pentode
 
Join Date: Oct 2014
Location: Wiltshire, UK.
Posts: 236
Default Re: Tektronix 7623A poser

Colin,

That sounds a very reasonable explanation, just a little bit of a coincidence that four points all blew open circuit at the same time (fuse, L1198, somewhere inside C1198, and a PCB trace). Did you replace the fuse and try a second time? That would give the already weakened 'weak points' a second chance to go fully open circuit. It would be worth checking that the pad at the earthy end of C1198 isn't now connected to anything else via some damage internal to thePCB.

Regards,

Roger
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