-----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
The capacitor is mounted on the sub-board in the PSU that the IEC
receptacle is on.
The markings on the back show this is a PME271M622, but I'm having
trouble sourcing a replacement. Most of the places I usually look about
are
showing no stock or ridiculous minimum orders. On eBay
(shudder) there's a
similar model, but it's marked as an "X2", and I'm not sure if
that's an
acceptable replacement.
Could someone who is more famaliar with these things give me a
suggestion as to where I should be looking?
(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