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Subject: Re: [korgpolyex] Tape in Switch doesn't show load on display when activated

From: Michael Hawkins <korgpolyex800@...>
Date: 2011-09-06

Check the "UP" parameter button and the "4" on the keypad.

If they are OK then check the "Step Up" jack and the "Program Enable" switch functions.

If all of the above are working then simply check the Tape Enable switch itself.

If "Up" and "4" are OK then check the continuity of the wire in connector CN3 wire 11A.

Mike

From: cyllall <cyllall@...>
To: korgpolyex@yahoogroups.com
Sent: Tuesday, September 6, 2011 2:45 PM
Subject: [korgpolyex] Tape in Switch doesn't show load on display when activated

 
Hi Everyone,
My tape in switch doesn't do anything, so I can't load in the sounds by tape. It should show load on the display. Is the voltage comparator or one of the DTC transistors to blame? Anyone had a similar problem? I don't know if I can test those DTC transistors with a DVM and I don't have an analogue meter.The switch itself works fine but the schematic is difficult to read exactly what's going on. Does the signal end up at any of the Enable pins on any of the chips? I could work backwards then, which might be easier to find the fault.
Everything else seems to work OK.
Thanks
Martin