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.
16
Stewart Filmscreen Corporation
T
ROUBLESHOOTING
Problem description
Probable cause
Action to take
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 voltage availability. Contact an
electrician.
Screen won't roll up or down
(even though power is
available).
Bad connection at switch
Have an electrician or qualified service
person check the connection as follows:
N
If you have a
high voltage control
switch, check switch-line connections.
N
If you have a
low voltage control
unit,
check switch-line connections.
N
If you have a
screen trigger interface
,
contacts may be sticking—tap relay to
free contacts.
Screen roller chatters 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 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 drops when up
direction is activated (grinding
noise occurs).
Drop in voltage
Screen motor requires full voltage.
Have an electrician or qualified service
person check available voltage.
Screen continues past bottom
stop position.
White limit switch is out of
adjustment.
Readjust the white DOWN limit switch.
Turn the adjusting screw clockwise.
Batten retracts 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.
Turn the adjusting screw clockwise.
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.
are 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.
