Troubleshooting 7
© 2000 Martin Professional A/S, Denmark
Martin University MAC 2000 Service Seminar
SHUTTER/ DIMMER
RANDOM SHUTTER ACTION
Bad connection: If there is a bad connection to the drive motors. Check that all wires are
securely crimped in the connector. To avoid damaging the step drivers, always turn off the
power before connecting or disconnecting motors.
Loose adaptor: Check and tighten the adaptors on the dimmer blades.
Bad motor: The dimmer may continue to work even if one of the motors is defective.
PAN/ TILT
PAN OR TILT FAILS TO RESET (FBER)
Defective indexing switch: A defective micro-switch will not reset the feed back circuit,
and the motors will try to move the head longer than the mechanical stop, until a time-out
stops the motors. Close the switch manually and check for continuity across the contacts.
Improper pan reset switch adjustment: Adjust switch.
FEEDBACK ERROR (FBEP, FBET)
Dirty optical sensor: The pan and tilt position sensors are optical, and must not be
obstructed by dust or dirt. Clean the sensor with compressed air.
Bad connection: Check the cables from the sensors to the main PCB.
Defective optical sensor: There are 2 pan sensors and 2 tilt sensors. These can be tested
with an oscilliscope while the fixture is operating. Good sensors display a square 5 V wave
that varies in frequency with pan or tilt speed. Test the pan sensors across pins 2 & 3 and
pins 2 & 4 of PL301 on the main PCB. Test the tilt sensors across pins 2 & 3 and pins 2 &
4 of PL302.
Loose timing wheel:
HEAD STICKS IN YOKE
The head may get stuck if the arm covers are not seated correctly.
PAN AND TILT NOISY, SLOW, OR LOSING STEP
Motors out of (mechanical) phase: Adjust pan or tilt motors.
Different personality setting: Check that all fixtures have the same pan/tilt speed and
studio mode settings. Refer to the user manual.
Bad connection: If there is a bad connection to one of the drive motors, the other motor
will lose step, resulting in slower movement. Check that all wires are securely crimped in
the connector. To avoid damaging the step drivers, always turn off the power before
connecting or disconnecting motors.
Loose drive gear: To check and tighten the drive gears, refer to the procedures for pan and
tilt belt replacement.
Bad motor: Pan and tilt may continue to work even if one of the motors is defective. See
above.
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