Vintage Synth Repair

You are going to need a scope to fix it.  The schematic shows
the parts associated with selecting the waveform (although
they are also well marked on the PCB ... IC104/105 area).

GB


----- Original Message ----- 
From: "b_j_glover" <b_j_glover@...>
To: <vintagesynthrepair@yahoogroups.com>
Sent: Tuesday, May 16, 2006 1:59 AM
Subject: [vintagesynthrepair] Trying to diagnose a dodgy JX3P


I recently picked up a Roland JX3P (digitally controlled analogue) on 
Ebay and found that some notes played quiet on some patches. I think 
I've traced this as far as a problem with DCO1 on Voice 6. If the DCO 
is set to a square wave it seems OK, but if it's set to sawtooth or 
pulse it doesn't work. If anyone has any suggestions about what this 
might mean in terms of repairing the electronics it would be very 
helpful...

Thanks,

Ben








 
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