NorthStar GM1708 961X Installation Manual page 44

SECTION TWO - Installation
Table 2: Troubleshooting the installation (continued)
Problem Area Symptom
DISPLAY (cont'd) The display screen dims, either slightly or
more, after the unit has been on for a cer-
tain time.
If the display screen dims and also displays
the error message "unit too hot, backlighting
dimmed."
PROCESSOR
System lock-ups
Software-related:
System locks up under certain conditions,
such as when configuring screens, routes,
or waypoints. This maybe followed by a col-
ored screen indicating that you may want to
call the Northstar Service Department to
report an EIP (software) error.
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Possible Solutions/Reasons
•
The unit may be implementing its
auto-dimming mode, which occurs
when no keys have been pressed for
an hour or more (pressing any key
restores the previous brightness
level). When this occurs the display
screen dims to about half its normal
brightness (based on its current
brightness). Auto-dimming helps
maintain the integrity of the display
and reduce power consumption when
the unit is on for many hours at a time.
•
The unit may be running too hot
based on its current environment. In
this case, the display screen dims
only about or notch or so, which is
normal.
•
There are two covered external fans
at the back of the control head. When
one or both of these fans needs ser-
vicing, the 961's backlighting dims
substantially to reduce the unit's over-
all temperature. These fans are
dealer-serviceable; call your Northstar
dealer.
• Install the latest software upgrade (to
order, call the Northstar Service
Department).
961 INSTALLATION MANUAL Revision A