Using hand to rotate the motor found not rotating smoothly. Dismantle the motor and found 6 pieces of bearing/gear inside.Top 3 pieces of bearing/gear, bottom 3 pieces of bearing/gear. Please see photos
below:
Tuesday, August 20, 2019
Sperry Marine BME X-Band Motor Diagnostic
It was reported that radar stop turning during transmission. Checked scanner on/off switch it was in on position. Go to scanner and open up the upmast gearbox with build in transceiver. Heard a squirking sound from motor drive pcb. Carry out replacement of both motor and motor drive pcb. Checked the motor drive pcb and found two transistors holder melted. Two transistors were damage as well. Open the motor and found the 6 coils , 2 were darken. See photos below :
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