JRC JMR-92 Series Field Service Manual page 667

4.3.8.6 Replacing the Gyro Interface Circuit: GIF CMJ-554
[Required Tools]
The tools shown in the following table are required for replacement work.
No. Name
1 Flat head
screwdriver
2 Phillips screwdriver
Before conducting replacement work, turn OFF the circuit breaker for the power supply of the
display unit.
Do not lose the screws as they will be needed again.
The GIF uses the gyro compass signal as its power source.
Before changing the GIF, be sure to turn OFF the S1 switch of the GIF.
Step 1 Remove the front cover of the display unit mount kit and the lid of
the JB.
Remove the front cover of the display unit mount kit and the lid of the JB. For more information
about the removal procedure, refer to "Replacing the Fuses of the Serial LAN Interface Circuit:
SLC CMH-2370."
Step 2 Turn OFF the S1 switch of the GIF and remove the wires together
with the two-piece terminal block.
Turn OFF the S1 switch in the lower part of the GIF. Signals from the gyro compass are blocked.
Remove the wired two-piece terminal block J823.
Chapter 4 Replacement procedure
Table Required Tools
Size
2 mm, 6 mm
Size #2
4-446
Appearance