Pan / Tilt - Martin MAC 500 Service Manual

effect but is most visible when it affects the shutter. Install version 1.4.
4 . 8 . 2 S /
H U T T E R
• Shutter/dimmer acceleration in software versions before 1.2 occasionally caused the shutter/dimmer to lose step with some
control desks. Install software version 1.2 or higher.
4 . 8 . 3 D
I M M E R R E S P O N D S S L O W L Y W H E N B U M P E D
• A bug occasionally caused the dimmer to react slowly. Install version 1.2 or higher.
4 . 9 P /
A N T I L T
4 . 9 . 1 P
A N O R T I L T F A I L S T O R E S E T
• Defective indexing switch: The reset fails if the pan and/or tilt reset switches fail to close. Check the connections. Close the
switch manually and check for continuity across the contacts.
• Improper pan reset switch adjustment: Refer to section 3.8.
4 . 9 . 2 F
E E D B A C K E R R O R
• Dirty optical sensor: The pan and tilt position sensors are optical and must not be obstructed by dust or dirt. Clean the sen-
sor with compressed air.
4 . 9 . 3 H
E A D S T I C K S I N Y O K E
• The head may get stuck if the shells are not seated correctly, thereby forcing the rubber joint against the yoke. Remove the
shell and replace it correctly.
4 . 9 . 4 P
A N A N D T I L T N O I S Y
• Fixture out of balance. See "Balance plates" on page 24.
• Outdated software: Pan/tilt motor control in software up to version 1.4 does not take into account the added inertia due to
the achromatic lenses and counterbalance plates: step loss can occur at maximum speed if pan/tilt speed (PTSP) is set to fast.
• Motors out of phase. Adjust pan or tilt motors. Refer to "Pan motor synchronization" on page 16 or "Tilt motor synchroni-
zation" on page 16.
• Different personality setting. Check that all fixtures have the same pan/tilt speed setting (fast/norm). Refer to the user man-
ual.
• Bad connection. If there is a bad connection to one of the drive motors, speed will be reduced because only one motor is
working. 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.
1998-08-03
D I M M E R L O S E S S T E P
( FbER, FbEP, FbET)
,
S L O W
,
C A U S I N G L I G H T L E A K A G E W H E N C L O S E D
( PAER, TIER)
,
O R L O S I N G S T E P
Troubleshooting 21