21 May
2012
21 May
'12
5:01 p.m.
On 21/05/12 5:52 PM, Rob Jarratt wrote:
I have at least 4 MicroVAX IIs. Should I order spares...
--Toby
-----Original
Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of JP Hindin
Sent: 21 May 2012 16:11
To: cctech at classiccmp.org
Subject: BA23 PDP11/23 Power Supply that couldn't; Trying to locate a
replacement cap
Greetings;
I received a new (to me) MicroPDP11/23 that I was fiddling about with over
the weekend. After testing out the supply voltages, and then putting the
system together enough to get serial out of it, there was a pop, a whoosh
and a rather exciting ejected plume of smoke from one of the upper fans.
http://www.kiwigeek.com/misc/PDP1123_Cap1.jpg
http://www.kiwigeek.com/misc/PDP1123_Cap2.jpg
...
(Full markings:
0,22uF at X
250V ~ MP
fo=3,0MHz
RIFA
GPC 40/085/56
PME271M622)
Thanks to all;
- JP
This has happened to me on several MicroVAX II PSUs and it is the mains
filter capacitor. I have replaced them with these:
http://www.maplin.co.uk/metallised-paper-rfi-class-x2-capacitors-98166.
(N70CN for the one that failed)
I recommend changing the other one at the same time as it won't be long
before that one goes too.
Regards
Rob