Re: Dead PET 2001

Thanks again for the replies.
  I'm actually going to put the Pet to one side for a couple of weeks,  
as I feel I'm getting a little burnt out on it...and recently work has  
me pulling all nighters on a semi regular basis. Sucks!
I'll come back to it once I have a little more time.

I do have one unrelated and off topic question for the list:
I have a sharp MZ80k (similar in design to the pet, but z80), and I  
want to replace the 'read write' head in the cassette deck as I  
believe it has died. the head reads KA30 OE030, and I have done a  
search for these numbers but can not find any information. I have  
found a place that sells mono heads:

http://www.donberg.ie/search?query=AKM

...but I really need to know what Ohm rating I need before purchasing  
something. The number (KA) 30 makes me think it might be 300 Ohm.

Does anyone have experience with audio parts?

Thanks again
Phil


On Aug 18, 2009, at 12:56 AM, Bill Degnan wrote:

>
>
> -------- Original Message --------
>> From: "Vanessa Ezekowitz" <vanessaezekowitz@gmail.com>
>> Sent: Monday, August 17, 2009 11:11 AM
>> To: cbm-hackers@ling.gu.se
>> Subject: Re: Dead PET 2001
>>
>> On Mon, 17 Aug 2009 23:18:00 +0900
>> Philip Lord <random6000@mac.com> wrote:
>>
>>> The schematic says 1.0 25v so I purchases a 25v 1.0uf capacitor, but
>>> looking at the part I removed through a magnifying glass, it says 1k
>>> 35v. I'm guessing that 1k=10uf. If so, in that case I bought and
>>> installed the wrong parts.
>>
>> Capacitors are sometimes marked in multiples 1 nF (1000 pF). This one
> sounds
>> like its the latter, so the "1k" here likely means 1000 nF, or 1.0  
>> uF.
>>
>> Other caps are usually marked with the actual value (with units) or a
> value
>> code measured in pF.
>>
>
> If you see a 25v replaced with a 35v there is usually a reason such  
> as a
> field upgrade or compensation for another change up the line.  I  
> would opt
> to use a 35v to be sure.
>
> Bill
>
>
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