IRS Beta Servo Adjustment

Does anyone have a procedure for adjusting the servo and control woofers? Was there ever a service manual for the Betas?

When originally setting up my system, I did tweak the trim pot on the control woofer and saw some increase in low frequency response. It has worked great since but after more than a decade of my use, and the system being >30 years old, I’m sure it could use some adjusting.

No suggestions please on where to send it for service, thats not what I’m looking for.

@Paul must have some documentation on it!

Back when I got the system, just because I’m curious, I temporarily mounted a small PCB ICP accel (and ICP supply) to a woofer. Connected it to the servo, and it worked great!