emulatorII-list

Hi Guys-

Here's a quick update to the voice problem on my EII.  I emailed Rob 
from the Emu-Archive in order to get a qualified second oppinion. 
He kindly suggested to do some more troubleshooting before I blindly 
start to unsolder components from the board, which makes a lot of 
sense to me. 
He gave me the advice to build an 'audio test probe' out of test 
leads and an audio jack to hook up to an amp in order to pinpoint 
where the audio goes bad in the signal chain.

I purchased the miniature test leads at Fry's Electronics for $3.99 
and the mono 3.5mm jack was $0.99, which I soldered to one end of the 
test lead cable which will plug into the audio input jack of my 
little ipod amp. I was going to check for audio on the pins that Rob 
suggested, but I'm not sure how the pins are numbered. 

Here's what Rob wrote:

On channel 7 I would look for audio signal at:

IC46 Pin 2
IC46 Pin 6
IC88 Pin 2
IC78 Pin 12
IC78 Pin 7


Does anyone know by any chance how the IC pins are numbered? Thanks.

George

IC pins are numbered in a universal way...
 
http://www.kpsec.freeuk.com/components/ic.htm
 
Hope your testing gets you results.
 
Regards
Mike
 


--- On Fri, 14/11/08, George <trickstar303@...> wrote:

From: George <trickstar303@...>
Subject: [emulatorII-list] Dead Voice Update
To: emulatorII-list@yahoogroups.com
Received: Friday, 14 November, 2008, 4:54 AM






Hi Guys-

Here's a quick update to the voice problem on my EII. I emailed Rob 
from the Emu-Archive in order to get a qualified second oppinion. 
He kindly suggested to do some more troubleshooting before I blindly 
start to unsolder components from the board, which makes a lot of 
sense to me. 
He gave me the advice to build an 'audio test probe' out of test 
leads and an audio jack to hook up to an amp in order to pinpoint 
where the audio goes bad in the signal chain.

I purchased the miniature test leads at Fry's Electronics for $3.99 
and the mono 3.5mm jack was $0.99, which I soldered to one end of the 
test lead cable which will plug into the audio input jack of my 
little ipod amp. I was going to check for audio on the pins that Rob 
suggested, but I'm not sure how the pins are numbered. 

Here's what Rob wrote:

On channel 7 I would look for audio signal at:

IC46 Pin 2
IC46 Pin 6
IC88 Pin 2
IC78 Pin 12
IC78 Pin 7

Does anyone know by any chance how the IC pins are numbered? Thanks.

George 

 














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