27 Oct
2018
27 Oct
'18
9:22 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Patrick
Finnegan via cctalk
Sent: 27 October 2018 13:48
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: PinOut of DEC F11 Chips in a Professional 350
On Sat, Oct 27, 2018, 04:06 Rob Jarratt via cctalk <cctalk at classiccmp.org>
wrote:
I should have said that I have already checked, the ripple is about 100mv peak to peak,
which I assume is OK. The green DC OK LED is illuminating too, so I think the PSU is
fine.
Regards
Rob
I have been tracing the source of the RESET, because as I have said it
is oscillating, and it seems to go through a *lot* of logic, and I
haven't fully traced the source of the oscillation yet.
Have you checked the PSU output? My first guess would be bad caps in the
power supply.