JRC JMR-92 Series Field Service Manual page 679

2-4 Disconnect the GIF cable.
If a GIF is installed, turn OFF the S1 switch of the GIF and then remove the connection cable
with the GIF (W81: J835). For more information about the S1 switch of the GIF, refer to "Replacing
the Fuses of the Gyro Interface Circuit: GIF CMJ-554."
Chapter 4 Replacement procedure
RIF
W81
J835
J822
PＳ
GIF
ＳＳ
4-458