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computers / comp.sys.ibm.ps2.hardware / Planar for model 8580-X21

SubjectAuthor
* Planar for model 8580-X21Carsten Lyng
`* Re: Planar for model 8580-X21Tomas Slavotinek
 `* Re: Planar for model 8580-X21RickE
  `- Re: Planar for model 8580-X21Carsten Lyng

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Planar for model 8580-X21

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Subject: Planar for model 8580-X21
From: askevej37a@gmail.com (Carsten Lyng)
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 by: Carsten Lyng - Sun, 10 Jul 2022 10:11 UTC

My model 80 has stopped working, and it seems to be the planar that is dead.
The power supply has been tested in another system, and it works fine.
I have done some probing on the board, but i have not been able to find the fault.

So the big question is, where is it possible to find a new planar - it could be any type for the model 80. Because I have got a Kingston 486 Now installed in the system.
I have found 2 planars on Ebay, but with import taxes and shipping it will be very expensive..

Best regards
Carsten - Denmark

Re: Planar for model 8580-X21

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From: slavotinek@gmail.com (Tomas Slavotinek)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Re: Planar for model 8580-X21
Date: Sun, 10 Jul 2022 23:00:39 +0200
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 by: Tomas Slavotinek - Sun, 10 Jul 2022 21:00 UTC

On 10.07.2022 12:11, Carsten Lyng wrote:
> I have done some probing on the board, but i have not been able to find the fault.

Nothing on the parallel port? No bus/CPU activity at all?

Re: Planar for model 8580-X21

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Subject: Re: Planar for model 8580-X21
From: ekblaw@vnet.ibm.com (RickE)
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 by: RickE - Tue, 12 Jul 2022 02:32 UTC

On Sunday, July 10, 2022 at 5:00:41 PM UTC-4, Tomas Slavotinek wrote:
> On 10.07.2022 12:11, Carsten Lyng wrote:
> > I have done some probing on the board, but i have not been able to find the fault.
> Nothing on the parallel port? No bus/CPU activity at all?

"Some probing" is a bit vague. Here's where I would start looking:

1) Check all of the voltage rails on the system board, you only need a multimeter for this. My first thought is one of the tantalum capacitors shorting to ground.
2) Look for the CPU RESET line toggling (need logic probe or oscilloscope).
3) Look for data bus/address bus activity (again, need probe or o-scope).

Re: Planar for model 8580-X21

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Subject: Re: Planar for model 8580-X21
From: askevej37a@gmail.com (Carsten Lyng)
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 by: Carsten Lyng - Fri, 15 Jul 2022 17:52 UTC

tirsdag den 12. juli 2022 kl. 04.32.02 UTC+2 skrev ekb...@vnet.ibm.com:
> On Sunday, July 10, 2022 at 5:00:41 PM UTC-4, Tomas Slavotinek wrote:
> > On 10.07.2022 12:11, Carsten Lyng wrote:
> > > I have done some probing on the board, but i have not been able to find the fault.
> > Nothing on the parallel port? No bus/CPU activity at all?
> "Some probing" is a bit vague. Here's where I would start looking:
>
> 1) Check all of the voltage rails on the system board, you only need a multimeter for this. My first thought is one of the tantalum capacitors shorting to ground.
> 2) Look for the CPU RESET line toggling (need logic probe or oscilloscope).
> 3) Look for data bus/address bus activity (again, need probe or o-scope).

The Voltage rails on the the system board is OK
I will ask my brother for help he has got a oscilloscope

computers / comp.sys.ibm.ps2.hardware / Planar for model 8580-X21

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