TROUBLESHOOTING
SYMPTOM
1. Screen will not operate or will not
go
“down”
.
2.
Motor
hums.
CAUSE
(a) Blown fuse.
(b) Tripped circuit breaker.
(c) Improper wiring to operating
switch.
(d) Improper wiring to junction box in
screen.
(e) Thermal overload tripped (exces-
sive overheating).
(f) Burned out motor winding.
(g) Defective limit switch.
(a) Temporary binding.
(b) Shipping bracket not removed.
(c) Defective capacitor.
SOLUTION
(a) Replace fuse.
(b) Reset circuit breaker.
(c) Tighten all loose wire connec-
tions. Correct any improper con-
nections. Check for power.
“Down” Position
Check for power across black and
white leads.
“Up” Position
Check for power across red and
white leads.
(d) “
Down” Position
Check for power at black and
white leads.
“Up” Position
Check for power at red and
white leads.
(e) Let motor cool down for 15 min-
utes. Try again.
(f) Disconnect motor leads and
check for continuity between
black and white wires for
“down”
position. Check for continuity be-
tween red and white wires for
“up”
position. Replace gear motor
if either combination shows an
open circuit.
(g) Disconnect
“down”
limit switch
from circuit. Check for continuity.
Switches are normally closed and
open on contact.
(a) With power
“off,”
turn roller by
hand to free binding.
(b) Remove shipping bracket and
wooden wedge.
(c) Replace capacitor
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