29 Mar
2020
29 Mar
'20
3:30 p.m.
Since I am forced to stay at home more than I would like I though I would
check some more PSUs. One I wanted to check was the H7109-C from one of my
VAXstation 4000 VLC machines. I found a leaked capacitor and some other high
ESR ones, so I will replace those. However, I also noticed a ceramic disk
capacitor that appears to be split all around the edge. Is that a known
failure mode?
Regards
Rob
29 Mar
29 Mar
4:56 p.m.
Since I am forced to stay at home more than I would like I though I would
check some more PSUs. One I wanted to check was the H7109-C from one of my
VAXstation 4000 VLC machines. I found a leaked capacitor and some other high
ESR ones, so I will replace those. However, I also noticed a ceramic disk
capacitor that appears to be split all around the edge. Is that a known
failure mode?
Is it definately a capacitor?
I've had some damaged surge arrestors / MOVs / VDRs that look very similar
to ceramic disc capacitors.
Regards,
Peter Coghlan.
11:30 p.m.
I don't know, but thanks for pointing out that it might not be a capacitor.
I have two more VLCs so I will open them up and see what the markings are,
the markings on this one are almost illegible.
Thanks
Rob
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Peter Coghlan
via
cctalk
Sent: 30 March 2020 00:56
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at
classiccmp.org>
Subject: Re: Split Ceramic Disk Capacitor
to
Since I am forced to stay at home more than I would like I though I
would check some more PSUs. One I wanted to check was the H7109-C from
one of my VAXstation 4000 VLC machines. I found a leaked capacitor and
some other high ESR ones, so I will replace those. However, I also
noticed a ceramic disk capacitor that appears to be split all around
the edge. Is that a known failure mode?
Is it definately a capacitor?
I've had some damaged surge arrestors / MOVs / VDRs that look very similar ceramic disc capacitors.
Regards,
Peter Coghlan.
30 Mar
30 Mar
11:13 a.m.
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Rob Jarratt via
cctalk
Sent: 30 March 2020 07:31
To: 'Peter Coghlan' <cctalk at beyondthepale.ie>; 'General Discussion:
On-Topic
and Off-Topic Posts' <cctalk at
classiccmp.org>
Subject: RE: Split Ceramic Disk Capacitor
I don't know, but thanks for pointing out that it might not be a
capacitor.
I have two more VLCs so I will open them up and see
what the markings are,
the markings on this one are almost illegible.
Thanks
Rob
I have just opened up one of my other VLC machines. The part in question is
marked
.0033M
Z5U
I guess this means a 3.3nF capacitor? Or will it mean 3.3uF?
Thanks
Rob
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Peter
Coghlan
via
cctalk
Sent: 30 March 2020 00:56
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at
classiccmp.org>
Subject: Re: Split Ceramic Disk Capacitor
to
> ceramic disc capacitors.
Since I am forced to stay at home more than I would like I though I
would check some more PSUs. One I wanted to check was the H7109-C
from one of my VAXstation 4000 VLC machines. I found a leaked
capacitor and some other high ESR ones, so I will replace those.
However, I also noticed a ceramic disk capacitor that appears to be
split all around the edge. Is that a known failure mode?
Is it definately a capacitor?
I've had some damaged surge arrestors / MOVs / VDRs that look very
similar >
> Regards,
> Peter Coghlan.
11:21 a.m.
On Mar 30, 2020, at 2:13 PM, Rob Jarratt via cctalk
<cctalk at classiccmp.org> wrote:
I have just opened up one of my other VLC machines. The part in question is
marked
.0033M
Z5U
I guess this means a 3.3nF capacitor? Or will it mean 3.3uF?
Thanks
Rob
I'd say 3.3 nF. M is probably a voltage rating.
Odd for it to be split. I could just barely imagine that from mechanical stress. Or
perhaps severe overvoltage. Where is this part used?
paul
11:31 a.m.
RobI'd say
3.3 nF. M is probably a voltage rating.
Odd for it to be split. I could just barely
imagine that from mechanical stress. Or perhaps severe overvoltage. Where is this part
used?
paul
1497
days inactive
1498
days old
5 comments
4 participants
participants (4)
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cctalk＠beyondthepale.ie -
paulkoning＠comcast.net -
robert.jarratt＠ntlworld.com -
wrcooke＠wrcooke.net