The company PR Camera Repair Inc has on their website a photo of the replacement motor that they used to stock for the MZ-5n which is marked as RF-N30CA-11150.
The Evercom website (who supply many small motors) lists a motor ERF-N30CA-11150 which has the same dimensions as the motor in the MZ-5n but has a voltage operating range of 2-5VDC and not the 1.5v that is mentioned for testing the motor in the MZ-5 service manual.
The original motor has the Mabuchi trade mark embossed next to the negative pole and they list an RF-N30CA-11150 in their documentation with the same specifications as the Evercom item.
The coil resistance of my motor is about 5 ohms which corresponds with the data given for the ERF-N30CA-11150 which gives a stall current of 0.79A which with a 5V supply would mean a coil resistance of 4 ohms.
Does anyone know whether the replacement motor that used to be supplied was indeed the RF-N30CA-11150 and if so whether the correct voltage to operate the motor is between 2 and 5 volts?
One way for me to properly answer this question would be to rebuild the camera (which is now in many pieces) and measure the voltage supplied to the motor when the shutter is fired.
I would like to avoid this so would be most grateful if anyone has deep knowledge as to the motor specification.
I now am getting fairly confident that the 1.5V mentioned in the service manual for the MZ-5 for operating the mirror motor does not apply to this camera.
Last edited by Geoffrey; 01-29-2020 at 11:58 PM.
Reason: more information regarding my motor