JRC JMR-92 Series Field Service Manual page 670

Step 5 Check operation.
After the replacement of the GIF is completed, turn ON the S1 switch of the GIF and the circuit
breaker for the power supply of the display unit, and check the operation as follows.
(1) Check that a cable open error has not occurred.
(2) Check that true bearing values are displayed on the screen.
This completes GIF replacement.
4-449 Chapter 4 Replacement procedure