YPE
OF PROBLEM
Condition
(continued)
Condition
C
Red
lamp on, clear lamp
off
Unplug
TO CHECK
f
check is
OK,
go to
next
check
i.
Check microswitch
With no fluid
pressure in the pressure control discon-
nect wires
and
Check con-
tinuity across switch terminals with an
ohmmeter. Switch contact should be
closed. Depress actuator
An
audible
indicates the contacts
have opened. Ohmmeter should read in-
finity.
Check circuit board
by substituting
with a good board. See page
22.
.
Check circuit board
by removing
from box
disconnecting wires;
sea
page
22
for removal procedure.
Removing the circuit board
while still wired over-rides the optical
.
to over-pressurize, if the microswitch
detector which could cause the sprayer
does not function properly. Tum the
sprayer on
ONLY
long enough to check
lamp condition, then shut
off
immediate-
ly.
To reduce the risk of elec-
tric shock, handle board by edges
Do
not allow any metal objects to come
in
with the
should be
on
now
-
removing the circuit
Plug in and turn on sprayer. Clear lamp
board over-rides the optical detector.
Turn
off
and unplug sprayer.
Check bourdon tube flag and detector
position. Reinstall circuit board
page
pressure setting to maximum;
flag should extend
than half way into
optical detector slot from the bonom.
DETECTOR
C
IR
C
U
IT-
BOARD
OF
OPTICAL DETECTOR AND
FLAG
'When replacing
the
bare
control box
the
bridge,
circuit
board
and
hardware and
reinstall
in
the
bare box.
WHAT TO
DO
If
check
is
NOT OK refer to
this
Replace microswitch. See page 19.
Replace circuit board. See page
22.
I.
Replace circuit board.
page
22.
2.
Calibrate pressure control to
sea
if that
corrects problem.
See
page
24.
not, replace bare pressure control box
See
page
23.
continued on next
page.
307-671
11
