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 :
