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Thread: Rodgers 990 Stops Issues

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    ppp Pianississmo Hurdy Gurdy Man's Avatar
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    Rodgers 990 Stops Issues

    I've been gradually restoring a Rodgers 990 organ that had various power supply problems, but am now trying to troubleshoot some of the stops. Four different stops are operating improperly, exhibiting various combinations and permutations of stuck on, stuck off, and indicators that disagree with what is being heard. I've got the Technical Manual, but it appears to be quite deficient, so I'm requesting 15 minutes of discussion with somebody who still remembers how these beasts work. My background is retired electrical engineer with Wurlitzer training, so I should be able to find my way around a 990 with minimal assistance. Looking forward to working with folks on this site!

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    ppp Pianississmo Hurdy Gurdy Man's Avatar
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    Update: Working on Stop stuck ON, found weird voltages around Q25, D25, & D26. Removed transistor -- it's fine. Diodes seem to be OK. Can't figure out what's downstream that could be causing trouble. Help!!!

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