Micromoog tuning

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1

I picked up a micro the other day. The electolytics on the power supply board were bulging so they’ve been replace.
I’m getting a steading +/- 15v now.

There are 2 issues now: tuning and drift.

The tuning procedure has been performed, but the synth is always a few cents sharp in the upper register.

The drift issue occurs after a key is released. While a key is depressed, the pitch is held. When release, the pitch slowly drifts downward.

Any have experience with this issue and wish to share?

Thanks in advance.

-Andy

2

I don’t have any experience with this specifically, but according to the Micro service manual one of these is the likely culprit:

  1. C212 or Q201 leaky.
  2. Solder flux, dust, contact cleaner or some other foreign matter on PC board in region of Glide Pot R251
  3. Broken guard trace on main PC board.