On 2023/04/23 3:16 p.m., Glen Slick via cctalk wrote:
On Sun, Apr 23, 2023 at 3:10 PM John Robertson via cctalk
wrote:
Oh, I am missing two key caps for the ADM31, anyone have spares? Not
sure what is printed on them at this point, but any caps would be better
than missing ones to start!
On Sun, Apr 23, 2023 at 3:10 PM John Robertson via cctalk
wrote:
>
> Oh, I am missing two key caps for the ADM31, anyone have spares? Not
> sure what is printed on them at this point, but any caps would be better
> than missing ones to start!
Keyboard photo to see what key caps are missing:
On 2023/04/18 8:48 p.m., Tony Duell via cctalk wrote:
On Wed, Apr 19, 2023 at 2:37 AM Tom Hunter via cctalk
wrote:
... or four $20 power transistors to protect a 10 cent fuse like on the DEC
VR-14 display.
In general the transistor(s) will fail short-circuit, thus taking out
the fuse too.
On Tue, Apr 18, 2023 at 11:04 PM John Robertson via cctalk
wrote:
>
> I like to start with schematics before poking too much...
So do I.
>
> I assume bad caps (will replace with low-ESR high temp), and possibly
> blown transistor(s)...
>
> *And Gregory Beat sent me a link that covers the 1001
On Wed, Apr 19, 2023 at 2:37 AM Tom Hunter via cctalk
wrote:
>
> ... or four $20 power transistors to protect a 10 cent fuse like on the DEC
> VR-14 display.
In general the transistor(s) will fail short-circuit, thus taking out
the fuse too.
Some switch-mode power supplies use special
On 4/18/23 18:37, Tom Hunter via cctalk wrote:
> ... or four $20 power transistors to protect a 10 cent fuse like on the DEC
> VR-14 display.
A friend who worked as a DEC CE decades ago, said that
"transistor-protected fuses" was a standing joke among that community.
--Chuck
... or four $20 power transistors to protect a 10 cent fuse like on the DEC
VR-14 display.
Tom
On Wed, 19 Apr 2023, 6:16 am Fred Cisin via cctalk,
wrote:
> On 2023/04/18 9:40 a.m., Tony Duell wrote:
> > The blown out resistor likely has "blown out" for a reason.
> > The replacement will
On Tue, Apr 18, 2023 at 3:16 PM Fred Cisin via cctalk
wrote:
> On 2023/04/18 9:40 a.m., Tony Duell wrote:
> > The blown out resistor likely has "blown out" for a reason.
> > The replacement will probably suffer the same faith unless you find the
> > root cause.
>
> Isn't there usually a larger,
On 2023/04/18 9:40 a.m., Tony Duell wrote:
The blown out resistor likely has "blown out" for a reason.
The replacement will probably suffer the same faith unless you find the
root cause.
Isn't there usually a larger, more critical component, such as a
proprietary microprocessor, to blow out
On 2023/04/18 9:40 a.m., Tony Duell wrote:
On Tue, Apr 18, 2023 at 2:51 PM Tom Hunter via cctalk
wrote:
The blown out resistor likely has "blown out" for a reason.
The replacement will probably suffer the same faith unless you find the
root cause.
As soon as I saw 'Boschert' mental alarm
On 4/18/23 09:40, Tony Duell via cctalk wrote:
> On Tue, Apr 18, 2023 at 2:51 PM Tom Hunter via cctalk
> wrote:
>>
>> The blown out resistor likely has "blown out" for a reason.
>> The replacement will probably suffer the same faith unless you find the
>> root cause.
>
>
> As soon as I saw
On Tue, Apr 18, 2023 at 2:51 PM Tom Hunter via cctalk
wrote:
>
> The blown out resistor likely has "blown out" for a reason.
> The replacement will probably suffer the same faith unless you find the
> root cause.
As soon as I saw 'Boschert' mental alarm bells triggered
Boschert made a
I’ve found that following traces and identifying components that connect to
either side of the failed resistor is usually a good start for finding root
cause.
Shorted power transistors, diodes, or portions of bridge rectifiers have been
the root cause of cascading failures in my cases.
The blown out resistor likely has "blown out" for a reason.
The replacement will probably suffer the same faith unless you find the
root cause.
On Tue, Apr 18, 2023 at 12:20 AM John Robertson via cctalk <
cctalk@classiccmp.org> wrote:
> I've checked bitsavers.org (Al does a great job!), and a
Why don’t you post a picture of the board and see if anyone can id the resistor
from an intact Adm31 they already own?
Sent from my iPhone
> On Apr 17, 2023, at 09:20, John Robertson via cctalk
> wrote:
>
> I've checked bitsavers.org (Al does a great job!), and a number of forums,
> but no
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