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YPE OF PROBLEM
Condition
B
(continued)
C
Condition
Red lamp on, clear lamp off
sprayer1
Unplug
'When replacing
bare pressire control box 13011. remow
the
circuit
and
hardware and
board
elecbical
WHAT TO CHECK
check is OK,
go to next
check
f
1306).
Check microswitch
With no fluid
i.
pressure in the pressure control discon-
nect wires TP18 and TP19. Check con-
tinuity across switch terminals with an
ohmmeter. Switch contact should be
closed. Depress actuator bunon. An
audible "click" indicates the contacts
have opened. Ohmmeter should read in-
finity.
i . Check circuit board
( 3 4 0 1
by substituting
with a good board. See page
.
(3401
Check circuit board
by removing
from box wirhout disconnecting wires;
sea page 22 for removal procedure.
WARNING:
Removing the circuit board
while still wired over-rides the optical
detector which could cause the sprayer
.
to over-pressurize, if the microswitch
does not function properly. Tum the
sprayer on ONLY long enough to check
lamp condition, then shut
off
ly.
To reduce the risk of elec-
WARNING:
tric shock, handle board by edges only1
Do not allow any metal objects to come
in contacl with the boardl
Plug in and turn on sprayer. Clear lamp
on
-
should be
now
removing the circuit
board over-rides the optical detector.
Turn off and unplug sprayer.
!.
Check bourdon tube flag and detector
position. Reinstall circuit board
22.
Turn pressure setting to maximum;
flag should extend less than half way into
optical detector slot from the bonom.
DETECTOR
C IR
C U IT -
BOARD
VIEW OF
OPTICAL DETECTOR AND
ON/OFFswitch,
the
in
the
new bare box.
reinstall
WHAT TO
If check is NOT OK
5.
Replace microswitch. See page 19.
3,
Replace circuit board. See page
2 2 .
I.
Replace circuit board.
immediate-
2. Calibrate pressure control to
corrects problem. See page 24.
page
( s e e
If not, replace bare pressure control box
See
13011' .
page
FLAG
bridge,
Tmubleshooting continued on next
DO
refer to this colurn
2 2 .
2 2 .
Sea
page
if that
sea
23.
page.
11
307-671
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