There is also this interesting page:
http://tech-diy.com/jobo.htm
The suggestion is to replace the Jobo motor controller that alters the motor speed by voltage with a more modern controller that uses pulses of voltage at the full voltage (24v) to control the speed. The argument for this is that running large drums at low speeds with the original controller wears out the motor because the low speed means low voltage. Low voltage with the original controller means lack of torque due to reduced current. Using the pulse width modulation controller to slow down the motor while using the max amount of current (in pulses) does not suffer the same issue.
I'm going to test this theory out. I purchased a PWM-based motor controller board from eBay (24 VDC, supports reversal just like original controller, knob to alter speed with pot) for about $35 shipped from China. I've got a really early CPP-2 -- the serial number is in the 2000 range I believe and it is well used. I purchased a lift and the 3010 expert drum but after reading about all the potential problems, I decided to swap the motor controller before putting it to use.
The linked web page addresses this for the CPE-2. I'm assuming it is the same for the early CPP-2 and CPA-2 models. I haven't removed the circuit boards to get at the output of the transformer that should be converting 120 VAC to 24 VDC.
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