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appendix a
T
ROUBLESHOOTING
* To test the data link with an ohm meter, disconnect the link from the controller and
measure the resistance across pins 2 and 3 of the XLR male plug. The reading should
be around 120 ohms. Readings from 400 - 20,000 ohms indicate the data link is not
terminated. Infinite resistance indicates a bad connection, broken wire, or a defective
fixture. Very low readings indicate a short circuit in the link or a defective fixture.
problem probable cause(s) suggested remedy
None of the fixtures
respond to the controller.
The controller is discon-
nected from the data link.
Connect controller.
Blackout or standby mode
selected.
Press blackout button.
Some fixtures do not
respond, respond erratically,
or continuously reset.
Bad data link connection.
Check data link connec-
tions/cables and correct
accordingly.*
DMX signal polarity
reversed.
Swap pins 2 and 3. See
section 2.
DMX signal reflection.
Insert termination plug in
the last light on the link.
Incorrect addressing of fix-
tures.
Check addresses.
Fixtures not on. Turn on fixtures.
Protocol auto-detection fail-
ure.
Switch the fixtures off and
then back on. In general,
power on the controller
before the fixtures.
Save commands do not
work.
Memory locked. Unlock memory.
Fixtures do not execute pro-
gramming on one or more
channels.
Fader control is overriding
programming.
Turn off fader control.
No light from some or all fix-
tures.
The scenes do not contain
‘Lamp On’ instructions for
fixtures with remote lamp
on/off.
Make sure the “Lamp On”
command is saved in at
least one scene.
Uneven or incomplete fader
control.
Faders not calibrated.
Calibrate faders as
described in “Service”.
23


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