[sdiy] broken oberheim matrix 6r

[David Brown]

Not sure but it was internal to the chip.

I've also seen this with some of the analog muxes in my ARP Avatar 
and an Roland Juno-106.  In the case of the Juno, it had all of the 
symptoms of a bad sound chip but was just in the control circuitry.

At 09:58 PM 4/4/2007, Danjel van Tijn wrote:
>So how did the two data pins become shorted together?
>Seems like these oberheim's are prone to selfdestruction! :p
>
>cheers,
>     Danjel
>
>
>On 4/4/07, David Brown <davebr at earthlink.net> wrote:
>>I had an 8253 fail in my Matrix-1000 which is basically the same
>>circuit design.  Two data pins shorted together with ~100
>>ohms.  Totally screwed up the processor.  I had to shotgun cutting
>>data lines to figure out where the short was.  The good news is that
>>the 8253 is cheap and available but a bear to replace.  I ended up
>>cutting off all the pins and removing each pin individually with a
>>solder sucker.
>>
>>Dave
>>
>>At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
>> >Hi karl,
>> >
>> >Does the 8253 timer commonly fail? I will definitely check it out...
>> >
>> >thanks for the tip!
>> >
>> >Danjel
>> >
>> >On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
>> >>Have you checked the 8253 timer?
>> >>
>> >>If these dont work you wont get any sound!
>> >>
>> >>KD
>>
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