Stewart Filmscreen Corp CM-1005 - Manual (Page 18)

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. Check to see if the circuit
breaker has switched off. Reset
if needed.
Check outboard switching
apparatus.
Check voltage availability.
Contact an electricia n.
Screen won't roll up or down
(even though power is available). Bad connection at switch.
Polarity of VICS line may be bad.
Have an electrician or qualified
service person check the
connection as follows:
· If you have a high voltage
control switch, check switch-
line connections.
· If you have a low voltage
control unit, check switch -line
connections.
· If you have a VICS, 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.
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.