1 Apr
2020
1 Apr
'20
11:24 a.m.
-----Original Message-----
From: Jon Elson <elson at pico-systems.com>
Sent: 01 April 2020 16:32
To: rob at jarratt.me.uk; Rob Jarratt <robert.jarratt at ntlworld.com>; General
Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Identifying Machine for DEC Memory
On 04/01/2020 02:08 AM, Rob Jarratt via cctalk wrote:
> I mistakenly bought some memory thinking it was for a VAXstation 4000
VLC.
It turns out
that it isn't. It physically fits a VAXstation 4000 Model
60, but putting it in that machine the machine fails to power up. The
part number is 50-19464-02, and I am unable to identify what machine it
works in.
Can anyone tell me where to find out?
Is it possible the board is defective? Does it have tantalum capacitors? well-known failure mechanism of these is that they
will work fine for
years, but
if left unpowered for about two years, they will fail
to a shorted
condition when
powered on again.
In surface mount style, they will be little yellowish blocks with a bar
engraved
or printed on one end.
Locating the one or two bad ones is an exercise in major frustration!
It is entirely possible that they are defective. I tried using a DMM to
measure the resistance across each of the capacitors. None showed a short,
but it could be that I am unable to establish proper contact. I noticed some
suggestions that they may be for a DECstation, I will dig mine out and see
if they work there.
Thanks
Rob
Jon