Some of you may recall seeing me post about the VAXmate PSU failure. Thanks
to members of this list I found the failed part in the PSU and the PSU is
now working again. However, it looks like the PSU failed because of a
failure on the monitor board. There is a burning smell coming from it,
possibly
>
> Some of you may recall seeing me post about the VAXmate PSU failure. Thanks
> to members of this list I found the failed part in the PSU and the PSU is
> now working again. However, it looks like the PSU failed because of a
> failure on the monitor board. There is a burning smell coming from i
Den lör 18 apr. 2020 kl 13:26 skrev Rob Jarratt via cctalk <
cctalk@classiccmp.org>:
> Some of you may recall seeing me post about the VAXmate PSU failure. Thanks
> to members of this list I found the failed part in the PSU and the PSU is
> now working again. However, it looks like the PSU failed
>> 1. If the EHT lead was not properly connected to the CRT anode, could
>> that cause problems?
>
> Possibly. I have VT220 terminal which was making a smell of ozone when it was
> running which I should have done something about but never got around to.
> This could have been due to corona disc
>
>
> One approach to testing flyback transformers seems to be to use a circuit
> that causes them to ring and observing whether the ringing is damped by
> shorted turns. I've never got around to trying this myself.
>
>
I have a VT100 that failed with some smoke coming out of the center of the
tra
> -Original Message-
> From: cctalk On Behalf Of Peter Coghlan
via
> cctalk
> Sent: 18 April 2020 12:57
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: VAXmate PSU fixed, but no video
>
> >
> > Some of you may recall seeing me p
circuit some years ago). I don’t think you can do ring tests in
circuit can you?
Regards
Rob
From: Mattis Lind
Sent: 18 April 2020 13:31
To: r...@jarratt.me.uk; Rob Jarratt ; General
Discussion: On-Topic and Off-Topic Posts
Subject: Re: VAXmate PSU fixed, but no video
Den
> Subject: Re: VAXmate PSU fixed, but no video
>
> >> 1. If the EHT lead was not properly connected to the CRT anode, could
> >> that cause problems?
> >
> > Possibly. I have VT220 terminal which was making a smell of ozone
> > when it was running w
ly learning to design a pwm flyback controller which is
more or less the same thing in principle?
--Toby
>
>
> Regards
>
>
>
> Rob
>
>
>
> From: Mattis Lind
> Sent: 18 April 2020 13:31
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion:
n-Topic and Off-Topic Posts ; 'Mattis
> Lind'
> Subject: Re: VAXmate PSU fixed, but no video
>
> On 2020-04-18 11:09 AM, Rob Jarratt via cctalk wrote:
> > I checked Q6 (in circuit), it is not shorted. I have already checked all the
> electrolytic capacitors for a bad ESR
and Off-Topic Posts' ; 'Mattis
> Lind'
> Subject: RE: VAXmate PSU fixed, but no video
>
> It is not my design, Tony Duell sent it to me and I think he got it from a
> magazine many years ago. I will try to find it.
>
> Regards
>
> Rob
>
> > -Or
>
> There were two VT220 designs (I think), using either an onboard or
> offboard flyback. The part number of the onboard flyback is 16-26299-01,
> and there are some available on eBay if you are feeling rich.
>
I don't want to hijack Rob's thread too much :-)
I actually have one of each design a
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