1998-08-0318 MAC 500
section 4
TROUBLESHOOTING
4.1 G
ENERAL
4.1.1 F
IXTURE
DOES
NOT
RESET
• Blown fuse: LEDs on the printed circuit board light up to indicate the power supplies are working. Check / replace the fuses
on the circuit board if one or more of the LEDs is not lit.
• Sensor connection reversed: The MAC 500 will not reset properly if any of the Hall sensor connections on color wheel 1 or
2, the fixed-gobo wheel, or gobo indexing is reversed.
4.1.2 F
IXTURE
RESETS
BUT
DOES
NOT
RESPOND
TO
THE
CONTROLLER
• Memory error (MERR): A memory error occurs randomly in fixtures with S/Ns from approximately 980201-001 to
980731-000 due to a change in the EEPROM used to store user data including mode and address, which the supplier failed to
Martin about. The problem is fixed in software from version 1.6.
• Missing or incorrectly set jumper: The MAC 500 has a jumper on the PCB to configure the pin-out of the XLR jacks. The
default configuration is DMX pin-out, i.e., pin-2 (-) and pin-3 (+). The fixture will not respond to DMX if the jumper is miss-
ing or set to Martin protocol. Refer to section 2.10.2.
• Bad connection: Check the connection at PL231. Check the continuity from the XLR input to the motherboard.
• Failure in the link: Diagnosing link problems is beyond the scope of this manual. See Recommended Practice for DMX512,
A Guide for Users and Installers, by Adam Bennette, available from PLASA, Ltd. and USITT Inc.
4.2 S
OFTWARE
UPLOAD
4.2.1 F
IXTURE
DOES
NOT
ACCEPT
NEW
SOFTWARE
• Corrupted software: The fixture will not respond to the MPBB1 uploader if its software is corrupted. It can be forced into
upload mode by setting it to boot mode from the control panel or, if that does not work, by moving the jumper on the mother-
board at PL 121 to the “INIT” position. See also the software log and procedure 2.10.2.
4.3 M
OTORS
4.3.1 S
TEP
MOTOR
DOES
NOT
TURN
,
OR
TURNS
ERRATICALLY
To avoid damage to the step drivers, always turn off the power before connecting or disconnecting the motors.
• Burned-out step driver: Most step motor problems are due to a burned-out driver. A burned-out driver results in erratic or
no movement. Test the driver with the Martin step drive tester or switch the motor to another circuit.
• Bad connection: Check continuity between the motor and the PCB. Alternatively, check the connections from the PCB to
the connection block by putting a working motor on the circuit. Check the wires from the motor by plugging it into a working
circuit.
• Burned out motor: You should only feel slight resistance when turning a step motor by hand. Replace the motor if it is hard
to turn. You can also check for equal resistance on the windings.
4.3.2 M
OTOR
TURNS
THE
WRONG
DIRECTION
• Reversed motor cable: Unplug the motor cable and flip it over.
4.4 L
AMP
4.4.1 L
AMP
DOES
NOT
STRIKE
The main reasons for lamp failure are a blown lamp, a hot lamp, and incorrect power settings. Discharge lamps become harder
to strike with use - an incorrect power setting may not be immediately apparent. Check the settings, allow the lamp to cool, and/
or try another lamp. Make sure the lamp is securely held in the socket. If this does not help, the problem may be one of the fol-
lowing.
• No power to the lamp (faulty relay): Turn the lamp on from the control panel. If you can hear the lamp relay “click”, the
control circuit is working. With the head in neutral position, remove the plastic arm cover on your right and, after switching
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