18
307–920
7. Check microswitch (302).Reconnect TP6
connectors.Connect volt meter to TP15
male and TP4. Meter should read 50–125
VAC.
8. Visually inspect microswitch (302) button.
Adjustment stud should not depress the
microswitch button when fluid pressure is
zero. Manually check by depressing but-
ton with small screwdriver; an audible click
indicates microswitch is in normal position.
9. Check microswitch (302) continuity with
ohm meter.
Be sure sprayer is unplugged!
Meter should read zero ohms with no fluid
pressure in the sprayer.
10.Check all terminals for damage or loose fit.
Reconnect TP6 connectors.
11.Check circuit board (23) by substituting
with a good board. See page 29.
1. Replace circuit board. See page 28.
2. Adjust pressure control to see if that cor-
rects problem. See page 30.
If not, replace pressure control (301)
@
. See
page 29.
MOTOR WON’T OPERATE
Condition B
(continued)
Both lamps off
REFER TO THE WIRING
DIAGRAM ON BELOW
TO IDENTIFY T EST
POINTS (TP).
Condition C
Red lamps on,
Clear lamp off
Unplug sprayer!
7. Clean microswitch male terminals. Re-
place loose or damaged terminals. Se-
curely reconnect leads.
8. Microswitch is faulty. Return sprayer for
repair.
9. Microswitch is faulty. Return sprayer for
repair.
10.Replace damaged terminals and recon-
nect securely.
11.Replace circuit board. See page 28.
WHAT TO CHECK
If check is OK, go to the next check.
TYPE OF PROBLEM
WHAT TO DO
If check is not OK, refer to this column.
CIRCUIT
BOARD
OPTICAL
DETECTOR
FLAG
1. Check circuit board (23) by removing from
box
without disconnecting wires; see
page 29 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 only! 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 the sprayer.
2. Check bourdon tube flag and detector po-
sition. Reinstall circuit board (see page
29). Turn pressure setting to maximum;
flag should extend less than half way into
optical detector slot from the bottom.
AC1
AC2G2
_
+
G1
WIRING DIAGRAM
306
303
309
308
TP6
TP16
TP10
TP9
TP14
TP13
TP7
TP15
MOTOR
LEADS
NOTE:
These leads have
interchangeable
connections:
TP9
and
TP10
TP13
and
TP14
TP15
and
TP16
WHITE
BLUE
YELLOW
RED
GREEN
BLACK
WHITE
THERMAL SWITCH
GROUND
WIRE
BLACK
POWER SUPPLY CORD
MOTOR
302
TP8
TP1
TP2
TP3
TP4
Summary of Contents for 231-081
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