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JX
SERVICE PROCEDURES
COMPASS CALIBRATION PROCEDURE
VARIANCE SETTING PROCEDURE
Variance is the difference between magnetic North
and geographic North (Fig. 5). To adjust the compass
variance set the CMTC to Compass/Temperature
mode and press both US/M and STEP buttons for up
to one second than the symbol VAR and the current
variance zone number will be displayed. Press the
STEP button to select the proper variance zone as
shown in (Fig. 5). After five seconds of inactivity, the
displayed zone will be automatically set and normal
operation
in
the
resumed.
Calibrate the compass by driving the vehicle in a
circle with a constant speed between 5 and 11 MPH
(8 and 18 Km/h), the diameter should be between 6
and 27.5 meters (30 and 90 feet). The speed of the
vehicle should not vary no more than 3 MPH (5
Km/h) otherwise the calibration is aborted.
To ensure that the compass has been properly cal-
ibrated, point the vehicle in each of the following four
directions: (N), (S), (E), and (W).
Compass/Temperature
Fig. 5 Variance Settings
INSTRUMENT PANEL AND SYSTEMS
DIRECT METHOD
Turn the vehicle to head in either a North or South
direction. The vehicle must be within 45 degrees of
the North or South position or the SETTING the
VARIANCE will be ignored. The vehicle may be sta-
tionary or driving at any speed for this operation.
Depress the STEP button until the Compass/Temper-
ature screen is displayed. Simultaneously press both
the US/M and STEP buttons up to one second, than
the symbol VAR and the current variance zone num-
ber will be displayed. Within the next five seconds
momentarily press the US/M button. The variance
will be set and normal operation in the Compass/
Temperature mode resumed. If the US/M button is
mode
not pressed within the five seconds interval, the com-
pass variance shall not be changed and normal oper-
ation in the Compass/Temperature mode resumed. If
the VAR symbol flashes twice before resuming oper-
ation, the new zone was not accepted. Realign the
vehicle to within
try again.
45 degrees of North or South and
8E - 5
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