Starting the PAiA 4700 restoration project

I recently bought an old PAiA 4700 modular synthesizer. There are som known problems with my unit and while I spend time fixing it, I plan to write about the expericence here.

The modules included are:
2 4710 balanced modulator
1 4711 4/2 mixer
1 4712 reverb
3 4720 VCO
1 4730 VCF
2 4740 envelope generator
1 4750 control oscillator noise
1 4771 regulated power
1 4780 sequencer

The modules are mounted in a 4761 case and there is one 4782 keyboard.

The work will include (but are pbably not limited to) the following:

• Fixing the non-working keyboard
• Replacing old capacitors and possibly some othe components
• Fix some bad wiring
• Trimming the modules. The signals from the oscillators does not look like the ideal sine, saw, triangle and square, and the filters frequency response is weird
• Adding missing screws
• Making new pin cables

Let the work begin!