Re: Dead PET 2001

Re: Dead PET 2001

From: Philip Lord <random6000_at_mac.com>
Date: Tue, 11 Aug 2009 23:00:58 +0900
Message-id: <03ADC39D-9AD8-4759-8045-E6934629B2C4@mac.com>
Unfortunately this is not the case.
thanks though.

On Aug 11, 2009, at 10:03 PM, Bil Herd wrote:

> Possible the meter is in AC mode?
>
> -----Original Message-----
> From: owner-cbm-hackers@ling.gu.se [mailto:owner-cbm-hackers@ling.gu.se 
> ] On Behalf Of Philip Lord
> Sent: Tuesday, August 11, 2009 8:31 AM
> To: cbm-hackers@ling.gu.se
> Subject: Re: Dead PET 2001
>
> Update:
> With the red leads detached from the capacitor I tested the voltages
> again this evening.
> Where as before I was getting over 8VDC, now I'm only getting 0.5VDC
> on the cathode side of the diodes...very strange. I wish I knew what
> was going on.
> Maybe it's time to start by removing the diodes and testing them.
>
> Phil
>
>
> On Aug 10, 2009, at 3:14 PM, Philip Lord wrote:
>
>> Thanks William,
>> I did as you described.
>> I removed the red wires from the capacitor and re-measured the
>> voltages on either side of the two diodes.
>> As before I get just over 8VAC on the anode side, but now I get
>> just over 8VDC on the cathode side.
>>
>> I also tested the large capacitor using the ohm meter on my digital
>> multimeter. It starts at Zero ohms and slowly rises.
>>
>> I apologies for my lack of electronic knowledge, and once again ask
>> what I should try next? Hopefully we are narrowing down the problem.
>>
>> Cheers again
>> Phil
>>
>>
>>
>> On Aug 10, 2009, at 1:07 PM, William Levak wrote:
>>
>>> On Sun, 9 Aug 2009, Philip Lord wrote:
>>>
>>>> oops...Please excuse my bad typing...what I mean to say was:
>>>>
>>>> Yes, I admit I was checking the voltage on the inside of the
>>>> diodes with my multimeter (digital) set to AC. I just rechecked
>>>> with it set to DC and the reading is still in the millivolt range.
>>>> If the diodes are indeed the culprit, I find it strange that both
>>>> diodes would be open?
>>>> As for the J8 connecter, it basically looks new, no dirt, or
>>>> burning at all.
>>>
>>> You said the fuse blew several times.  That would be enough to blow
>>> the diodes.  Disconnect the red wires from the capacitor, and check
>>> the voltages again.  Also check the capacitor for shorts.  If you
>>> don't have a capacitor tester, you can use an ohm meter.  The
>>> resistance should start at zero and build up.
>>>
>>>    Message was sent through the cbm-hackers mailing list
>>
>>
>>     Message was sent through the cbm-hackers mailing list
>
>
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Received on 2009-08-11 16:17:52

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