Technical data
YPE OF PROBLEM
ondition B
Iontinued)
WHAT TO CHECK
WHAT TO DO
If check is OK, go to next check
When check is not OK refer to this column
6. Check motor thermal cutout switch.
6. Allow motor to cool. Correct cause of over-
Connect volt meter to TP6 female and TP9
heating. If switch remains open after motor
female. Plug in and turn on sprayer. Meter
cools, check continuity between TP9 female
should reed 105 to 125 VAC. Turn off and
and TPlO with ohmmeter. If open, replace
unplug sprayer.
motor.
7. Check microswitch (301). Reconnect TP6
7. Clean microswitch male terminals. Replace
connectors. Connect volt meter to TP15
loose or damaged terminals. Securely recon-
male and TP4. Meter should read 50-125
nect leads.
VAC.
8. Visually inspect microswitch (302) button.
8. Microswitch is faulty. Return sprayer for
Adjustment stud (Q) should not depress the
repair.
microswitch button when fluid pressure is
zero. Manually check by depressing button
with small screwdriver; an audible click in-
dicetes microswitch is in normal position.
9. Check microswitch (302) continuity with ohm 9. Microswitch is faulty. Return sprayer for
meter.
Be sure sprayer is unplugged!
Meter
repair.
should read zero ohms with no fluid pressure
in the sprayer.
lO.Check all terminals for damage or loose fit.
10. Replace damaged terminals and reconnect
Reconnect TP6 connectors.
securely.
11 .Check circuit board (23) by substituting with
11 .Replace circuit board. See page 25.
a good board. See page 25.
:ondition C
1. Check circuit board (23) by removing from
1. Replace circuit board. See page 25.
led lamp on, clear lamp off
box without
disconnecting wires; see page
lnplug spra yerl
25 for removal procedure.
WARNING: Removing the circuit board
while still wired over-rides the optical detec-
tor which could cause the sprayer to over-
pressurize, if the microswitch does not func-
tion properly. Turn the sprayer on
ONLY
long enough to check lamp condition, then
shut off immediately.
WARNING: To reduce the risk of electric
shock, handle board by edges only1 Do not
allow any metal objects to come in contact
with the board!
Plug in and turn on sprayer. Clear lamp
should be on now - removing the circuit
board over-rides the optical detector. Turn
off and unplug sprayer.
2. Check bourdon tube flag and detector posi-
2. Calibrate pressure control to see if that cor-
tion. Reinstall circuit board (see page 25).
rects problem. See page 27.
Turn pressure setting to maximum; flag
should extend less than half way into optical
If not, replace bare pressure control box
detector slot from the bottom.
WlP. See page 26.
OPTICAL
DETECTOR
CIRCUIT BOARD
VIEW OF OPTICAL DETECTOR AND FLAG
‘When
replacing
the bare preeeure control box 1301), remove the circuit breeker,bridge,
circuit board and electrical hardware and reinetell in the new bare box.
Troubleshooting continued on next pege.
820447
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