Many years ago with microcomputers which came with low quality sockets, I had an assembler remove the sockets and solder the ICs in directly. That eliminated intermittent crashes in some 24/7 applications we were using them in. Something to consider in the general case.
Don Cramer
Beaverton, OR
From: Didier Juges <didier@...>
Reply-To: hp_agilent_equipment@...
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] HP 5342A processor board
Date: Mon, 18 Dec 2006 12:13:01 -0600
Jim,
Have you tried the obvious of pulling and re-inserting the CPU and ROMs
(and any other chip on socket)?
My 5370A has needed that treatment at least 3 times, in spite of Deoxit
ProGold. Each time it's been a different chip. I have had problems on on
the ROM card (twice) and the last time on the CPU card (with a little
PLD, probably used for address decoding). The fix is simple, simply
pulling the chips and putting them back fixed the problem, but the last
time I put some Deoxit on the chips of the ROM card and the ROM card
seems to be working solid now.
I have had a similar problem with a Marconi sweeper, but none of the
other HP gear I have has given me these problems. Maybe it was a bad
batch of sockets?
Didier KO4BB
Jim wrote:
Hi,
I am repairing a 5342A counter that has a bad A14 processor card. I have
traced the problem
to the CPU board by trading cards with a known good unit.
Are there any common failure modes with this processor assembly? EG CPU
failure, ROM
failure? The processor is a socketed MC6800L and there are three
soldered ROMs.
Is there anything special about the "L" revision of the 6800 other than
the ceramic/gold
package?
Thanks in advance,
JIm N8ECI
