Re: CBM-II 610 protection

Thanks!
The diode is a good idea. I will install it.

> Depends on the capacitors... Any of them with an 'ROE' logo? If yes, it 
> might be a good idea to replace them since I had more than one become a 
> short circuit on me.

Yes, they are with ROE logo and very old. I was also thinking better to 
replace these with a low ESR one.
I would like to keep the original PSU just to be as close to original state 
as possible.

Hege

-----Original Message----- 
From: Gerrit Heitsch
Sent: Tuesday, July 15, 2014 5:43 PM
To: cbm-hackers@musoftware.de
Subject: Re: CBM-II 610 protection

On 07/14/2014 10:30 PM, Istvan Hegedus wrote:
> Hi All,
> Now that I have managed to get a keyboard for my CBM-II 610 it works
> fine. Thanks for Christian!
> I would like to know however what kind of modifications should I do in
> order to make the life of this computer long?
> I mean, shall I install DIP cooler on CPU, PLA and any other ICs?

I would use heatsinks on the ICs that get more than warm. That would be
at least the SID and PLA. Check the others as well.

Then I would suggest to install suppressor diodes to kill any voltage
spikes or PSU going bad. I usually use the P6KE6.8A or the 1N5908 on the
+5V rail. The pin with the ring goes to +5V, the other one is connected
to GND. They are cheap enough to make that worth thinking about.


> I have changed the power supply connection for 240V input so it is safe
> in Europe now, the PSU gives proper voltages. Shall I replace any elko
> capacitors in the PSU?

Depends on the capacitors... Any of them with an 'ROE' logo? If yes, it
might be a good idea to replace them since I had more than one become a
short circuit on me.

  Gerrit



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