I use the drill to turn the encoder, the power supply to power it and the scope to watch the waveform.
Swapping a motor eliminates the entire circuit for that motor and leaves only the motor suspect. Very common for service techs to do if they don't have sophisticated equipment.
If the motor moves then it leaves how it moves and if it counts. If it moves correctly then the tach and armature are good. Lastly it leaves the encoder.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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