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Does shutter
rotate at any
time?
Yes
Does shutter seem
to bind during
rotation?
Yes
Chain most
likely too tight or
bearing surface
sufficiently
worn
Yes
Adjust shutter
motor and or
replace bearings
and air tubes
F1
F1
K1
TR101
15-2
Shutter Rotation Fault Tree
No
No
Check set screw
on shutter motor
gear and the
shutter position
switch
No
Possible faulty
shutter motor
Front View of Control Board
P1
TR102
TR103
TR104
TR105
Is the lamp lit?
Yes
Is LED #D17 lit
on PC Board
Yes
When LED #D17 is lit, check for
120VAC on #4 white and #6 red
on the terminal strip when
shutter should be rotating
Yes
Check for
120VAC at
shutter motor
Yes
No
Replace
shutter
Repair or replace
motor
wiring from
terminal strip to
shutter motor
Repair or replace wiring from
P2
R10
R9
22K
R11
120K
2
R59
8.2K
U8
U9
U6
No
The shutter will
not open for an
exposure w/o
the lamp being
lit. Go to the
No Strike Fault
tree
No
No
If LED #D17 is
lit, check for
120VAC at pins
2 and 4 at power
connector on PC
Board
Yes
No
Replace
PC Board
PC Board to terminal strip
Front View of Control Board
Triacs & Relay
J1
K1
Unit Power
TR101
Shutter Motor
High Relay
TR102
Medium Relay
TR103
Main Contactor
TR104
TR105
Lamp head fans
94MS42 Rev.B1 S/W Ver 2.06
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