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Max voltage for a motor

Hi,

 I have some DC motors disassembled from a printer (HP Business Inkjet 1000) and need to know their working/maximum voltage. Searching the motor's model name in google revealed nothing.

The printer works on 32 volts (!), but I doubt all that juice arrives to the motors.
In its current condition, there's no chance to test the voltage while printer is running.

Besides a trial and error approach that might fry the motors - How can I find the correct voltage for each motor?