94MS20 Rev. B4
8-1
8.
Fault Trees
No Strike Fault Tree
No Strike
Are there any LED's
lit on the PC board?
Is there 0 VAC across pin
#3 purple on terminal
strip and orange com. on
capacitor pack?
Is safety glass
installed and lever
actuated?
Is the lamp new?
Is there 500+ VAC
on pins #2 yellow
and #3 purple?
Faulty lamp
or trigger
board-
Verify
operation.
Is there less than
500VAC but more
than 0 VAC across#3
purple on terminal
strip and orange
com. on capacitor
pack?
Replace
lamp-
Verify
operation.
Is the PC board fuse
good?
Is there 190 to 245
VAC on #12 red &
#14 black to top of
power relay?
Repair or
replace
wires-
Verify
operation.
Is there 0 VAC across
pins #4 and #10?
Replace
PCB
Verify
operation
Repair or
replace
wires-
Verify
operation
Check wiring from
voltage selector
assy through
ballasts to
capacitors-
Verify
operation
Replace
thermostats,
safety switch
or associated
wiring-
Verify
operation.
Is there 120 VAC on
PCB connector pins
#2 white and #8
red?
Repair or replace
wires at power
relay or replace
power relay-
Verify operation
Is power relay
pulling in?
Replace
fuse-
verify
operation
Does shutter rotate
when power is turned
on?
No
No
Yes
No
No
Yes
Yes
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
Yes
No
Yes
Yes
500+ VAC:
Check wiring from
capacitors, through
resistor board, to
terminals #2 and #3. If
wiring is O.K., check
across terminal strip pins
1 to 2 and 1 to 3. If either
is less than 50 VAC, that
pin is shorted to ground.
No
No
No Strike Fault Tree
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