[TechAssist] Curtis Mathes A2647RK chassis C87-7 HOT failure

This one is blowing horizontal outputs (2SD1427) after running a couple of
hours or days.  Output timing is good, waveform stable, does not get hot,
caps test ok, B+ is 130V and stable.  Any history on this oldie...customer
wants it fixed for sentimental reasons and likes the cabinet.

I found nothing in the archives or tips pages.  This was one of the NEC
chassis from 1986 with the socketed chips.  I have seen lots of these with
bad connections at the sockets causing other problems.  Anyone ever have it
cause output failures?  I cleaned them and monitored the output and never
saw it change until it quit.

No problems with pix or sound when it is running, other than the CRT is
aged.  Current draw was well under 1 amp.

Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)






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