JRC JMR-92 Series Field Service Manual page 271

Step 3 Replace the receiving unit.
Open the T/R control circuit board cover to the front to remove the cables connected to the
receiving unit. Remove the four screws (M5) holding the receiving unit flange, the two screws (M5)
holding the metal fixture, and the screw at the right side of the receiving unit to replace the it.
Attach the metal fixture attached to the flange removed from the receiving unit you just removed
and put it onto the new receiving unit. After replacing the receiving unit, assemble the unit in the
reverse order of the disassembly procedure. Do not forget to tighten the bolts or screws, and make
sure that the cables are connected.
Step 4 Operation check
After replacing the receiving unit, check operation by following the procedure below.
(1) Turn On the Display unit. After the countdown is completed, start transmission and check
that the radar image appears without error. Transmit the radio wave in the long range
mode and open the service engineer menu to perform tuning adjustment. Adjust the
setting in the service engineer menu until the tuning indication bar on the display unit
reaches the 8th calibration marking.
This completes receiving unit replacement.
Remove the six screws.
Metal fixture
(reused for the new receiving unit)
Disconnect the cables.
Remove the two screws.
4-51 Chapter 4 Replacement procedure