JRC JMR-92 Series Field Service Manual page 666

Step 4 Check operation.
After the replacement of the GIF fuses 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 true bearing values are displayed on the screen.
This completes GIF fuse replacement.
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FUSE
②
①
GIF Fuses
Chapter 4 Replacement procedure