If you have a Conti with bits missing and don't really want to
spend a lot of money on restoring it fully, the question is where can you
find information on the missing parts?
Well as you know I'm a bit of a specialist in that respect,
it's more of a case I may be able to provide information that allows you
to get your Conti working.
Below is a photo of one version of the oscillator board. Should your oscillator cease to function correctly, then I suggest you replace the 150R resistor as identified in the photo. It provides biassing for the frequency dividers, I have replaced numerous of these. They simply go out of tolerance. Check it for yourself. It's 150R plus or minus 10% which is: 135R to 165R the ones I took out were well out of this range. Just for info, the transistors are all OC71.
Once done I noticed some octaves were missing, on further investigation
I found some of the collector resistors had broken, just in the device
so not to be visible from the outside. Replacing the 2k2 restored the circuit.
One to check.
What do the two adjusters do on the power supply? Well you would expect them to change the voltage or something, well they don't. One is Vibrato frequency and the other is depth. Give them a twiddle and see (don't forget to switch the Vibrato on).
A word of caution, that oval shaped metal thing just right of the
adjusters, marked OC35 is at about 30VDC so don't touch it or short it
to anything as it could cause damage to you or the organ , thank you.
