Marquee 8521 Ultra Green (HUD) User's Manual
4-4
Maintenance
Symptom:
While in use, the projector suddenly become non-responsive to keypad commands, even when using
a built-in keypad.
Cause/Remedy:
1. Although rare, it is possible that an internal software error occurred which has put the
software in a non-ending loop. This might occur if a power spike interfered with the
projector's internal processor system. To fix this problem, leave the projector plugged in and
using a small screw driver or ball point pen, press the recessed RESET button on the back
panel. This operation will reset the projector's processor without affecting memories or
display settings.
Symptom:
The projector does not respond to the [
STBY
] or [
MUTE
] keys.
Cause/Remedy:
1. You may not be holding down the key long enough to initiate the action. Like [
POWER
],
[
STBY
] and [
MUTE
] must be pressed down for at least one second.
Symptom:
The projector does not respond to an IR Remote keypad.
Cause/Remedy:
1. The projector's IR keypad listening status may be turned off. Press [
PROJ
] [
]to turn on the
listening status of all projectors, or press [
PROJ
] followed by the projector's identity number
to turn on the listening status of the projector you want to respond.
2. The keypad's protocol (A or B) might not match the projector's IR protocol setting. Refer to
Section
Error! Reference source not found.
for instructions on how to check and change
the keypad's protocol setting. However, if the projector's setting is "Off", the remote keypad
will not respond. You may have to configure the keypad for built-in operation to gain control
of the projector.
3. The IR keypad may be too far away from the projector or screen. Use the IR keypad closer
to the projector or screen. Also ensure the keypad is pointed directly at the screen or the
front of the projector.
4. The viewing path between the IR keypad and the projector (or screen or switcher) may be
restricted. Ensure there is a clear line-of-sight between the keypad and the projector (or
screen or switcher).
5. The sensor may be disabled per the Keypad Options menu ([
UTIL
] [
6
] [
1
]).
6. The batteries in the IR keypad may be weak. Replace the batteries in the keypad. See
Section 1.1.1 for battery installation instructions.
7. There may be unusual lighting conditions in the room which effect IR keypad operation.
Determine if such conditions exist and correct.
Symptom:
The display is jittery or unstable.
Cause/Remedy:
1. The horizontal or vertical scan frequency of the input signal may be out of range. Check the
specifications in Section 1 for scan frequency ranges.
2. Synchronization signals from the source may be inadequate. Correct the source problem.
3. The input signal type may not match the signal type required by the input module. Install the
correct input module/interface to match the signal type of the source.
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