Martin DMX Controller 2518 User Manual download pdf (Page 23)

appendix a

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”.

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Martin DMX Controller 2518 User Manual Page 23

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