Troubleshooting - Da-Lite EXECUTIVE ELECTROL Instruction Book

TROUBLESHOOTING

SYMPTOM
1. Screen will not operate or will not
go "down".
Motor does not hum.
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.
NOTE: Use low voltage control (LVC)
electrical checklist for 3-button control.
Defective wall switch.
Defective LVC unit.
(e) Thermal overload tripped (exces-
sive overheating).
(f) Burned out motor winding.
(g) Defective limit switch.
(a) Temporary fabric binding.
(b) Shipping bracket not removed.
(c) Defective capacitor.
5
SOLUTION
(a) Replace fuse.
(b) Reset circuit breaker.
(c) Tighten all loose wire connec-
tions. Correct any improper
connections. 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.
Shut power "off" at breaker. Remove
wall switch and check for broken or
loose connection. Replace if defective.
Check LVC electrical checklist.
(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. Replace if de-
fective.
(a) With power "off," turn roller by
hand to free binding.
(b) Remove shipping bracket and
wooden wedge.
(c) Replace capacitor