Topic: Help... micromoog scaling issue

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Posted at February 27, 2006, 1:02 am:

I am restoring a micro. I've replaced most of the op-amps and transistor arrays. I checked all of the voltages on the power and main board and they are within specs shown on the schematic. The trimpots all checked out with a digital VOM. Every front panel control works to produce sound accordingly. I have metered every trace for opens and shorts to ground. I'm having this problem that xanthene had posted some time ago. ( I've been trying everything and I can't seem to be able to solve this OSC Scale / OSC HI problem. When I try to tune the Hi F, the OSC Scale trimpot is fully CCW and the Hi F is off by -20% of a perfect F. As for the OSC Hi, it is always fully CW and off by about 20%.)

Noted problems:
The voltage to the resistor string was 2.16 vdc not 2.58 vdc
The oscillator hi trimpot has no affect
The oscillator scale has a range of about 1 semitone

Anyone know ? or have an idea ? xanthene, did you ever get a response?
Thank you all for your help.

ms-5
sonic six
arp quadra
alpha juno 1
yamaha sy55
korg triton
Thanxs winbyte

Original of the message was taken from http://www.moogmusic.com/forum/

Replies:

Check if the keyboard scaling is off.

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