Vintage Synth Repair

Hi Grant,
 
It seems like the later rev eproms were missing some of the higher numbered tests. I'm positive the SER7 is...
 
Have you tried swapping the RAM chips with each other and seeing if the problem changes?


>________________________________
>From: grantpbt <grantbt@...>
>To: vintagesynthrepair@yahoogroups.com 
>Sent: Friday, February 15, 2013 1:04 PM
>Subject: [vintagesynthrepair] DX7 Test Modes
>
>  
>Does anyone know how to get into the higher numbered test modes on an original DX7? The Test Mode in my EPROMs only go up to test 8 and I need something like 9, 10 or 11 to test what appears to be flakey SRAM. Is don't have a cart.
>
>GB
>
>PS. My EPROMs are v1.8 and Special Edition.
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