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(4) Take out the fuse and check if it is blown.
If it is blown, replace it.
(5) Similarly, check the three other fuses.
[Mounting]
(1) Assemble the unit in reverse order of removal.
(2) Start the equipment, and set the true bearing value.
[Operation check]
(1) Check that an error message is not displayed.
(2) The true bearing value is traced correctly. (Resolution, and rotation direction)