Stewart Filmscreen Corp 4-Way ScreenWall ElectriMask - Manual (Page 22)

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.
20 Stewart Filmscreen Corporation
T
ROUBLESHOOTING
Problem description Probable cause Action to take
Mask 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.
Mask 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 mask input or projector
output. Check 12V DC line for
correct polarity. Contacts may be
sticking—tap relay to free
contacts.
Mask roller chatters when power
is activated. Can be caused by voltage drop,
bad connections, or a defective
switch. Have an electric ian or qualified
service person check all hook -ups
including all outboard wiring.
Unit hums in up mode. ( Mask
has already retracted.) The mask 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 UP limit switch. Turn the
adjusting screw clockwise. Refer
to Figure 15. See pp. 17-18 of this
manual.
Mask drops when up direction is
activated (grinding noise occurs). Drop in voltage. Mask motor requires full voltage.
Have an electrician or qualified
service person check available
voltage.