JRC JMR-92 Series Field Service Manual page 295

Step 2 Replace the driver circuit board.
Remove the cables connected to the driver circuit board and the screws (four M4 screws) and
replace it.
For the motor driver circuit there are two types of specifications, 100 V AC and 220 V AC.
Check that the new motor driver circuit uses the appropriate power supply specification.
(Described on the silk printing on circuit board.)
After having replaced the driver circuit board, reassemble the unit following the disassembly
procedure in the reverse order. Do not forget to tighten the bolts or screws, and make sure that the
cables are connected.
Step 3 Operation check
After completing the replacement work, turn On the safety switch and follow the steps below to
check the operation.
1. Turn On the radar. After preheat countdown is finished, start transmission and check that
the radar image is correctly displayed. Check that the motor does not make any
abnormal sound when it starts to rotate, while it is rotating, or when it stops.
2. Open the service engineer menu and initialize the motor rotation time.
This completes motor replacement.
4-75 Chapter 4 Replacement procedure