Stewart Filmscreen Corp LCD Front Projector - Manual (Page 19)

Refer to the following guidelines if you encounter a difficulty in the operation
of your Stewart Filmscreen. Problems related to electrical or motor function
may require a qualified service person or electrician.
Should you have a problem that is not addressed here, call the Stewart
Filmscreen Corporation.
ABT-EM Trapdoor ElectriMask Electriscreen: Owner’s Manual 17
T
ROUBLESHOOTING
Problem description Probable cause Action to take
Door won't open.
Screen won't operate.
No AC power available.
Outboard switching problem.
Check to see if the circuit breaker has switched off.
Reset if needed.
Check outboard switching apparatus.
Check voltage availability. Contact an electrician.
Check that the toggle switches are in the correct
position. See Figure 3, p. 5.
Screen or mask won't roll up
or down (even though power
is available). Bad connection at switch.
Polarity of STI line may be bad.
Have an electrician or qualified service person check
the connection as follows:
· If you have a low voltage control unit, check switch-
line connections.
· If you have a high voltage control switch, check
switch-line connections.
· If you have a screen trigger interface, check line
connections, or the mini-plugs at the screen input or
projector output. Check 12V DC line for correct
polarity. Contacts may be sticking—tap relay to free
contacts.
Roller tube motors chatter
when power is activated. Can be caused by voltage drop,
bad connections, or a defective
switch. Have an electrician or qualified service person check
all hook-ups including all outboard wiring.
Unit hums in up mode.
(Screen or mask has already
retracted.) The screen batten is retracting too
far into the case. Failure to
correct can damage motor and
screen. Do not use the unit until
this problem is resolved. Have a qualified service person adjust the yellow UP
limit switch. Turn the adjusting screw clockwise.
Screen or mask drops when
up direction is activated
(grinding noise occurs). Drop in voltage. Motors require full voltage. Have an electrician or
qualified service person check available voltage.
Screen or mask continues
past bottom stop position. White limit switch is out of
adjustment. Readjust the white DOWN limit switch. See pp. 14-15
of this manual.
Battens retract too far into
case. Yellow limit switch out of
adjustment. Failure to correct
can damage motor and screen.
Do not use the unit until this
problem is resolved. Have a qualified service person readjust the yellow
UP limit switch. See pp. 14-15 of this manual.
Motor shuts off. Motor has
been in use for more than
2 minutes. Motor is designed for short
operations (lowering and
retracting), not continuous duty.
Longer operation, such as during
setup and positioning, causes the
motor to overheat and shut off. Allow the motor to cool down. Complete cooling can
take an hour or more. Heat gain is cumulative and
takes time to dissipate. If motor use is initiated before
it has cooled completely, the motor will shut down
again when it reaches maximum temperature.
Any controller (e.g., STI,
LVC, etc.) fails to operate
motor.
Dirt, finger prints, marks, etc.
on screen surface. Improper handling of screen. Brush off or use a mild detergent solution with clean
rag or cotton swab.
Indentations appear on
screen surface. Debris or particles adhering to
screen due to static cling. Check back of screen; gently brush debris away by
hand.