Wiring Diagram - Graco 231–034 Instructions And Parts List

2. The motor will not operate. (Continued)
PROBLEM WHAT TO CHECK
If check is OK, go to next check
Condition B 6. Check the motor's thermal cutout switch. Connect a
volt meter between TP6 female and TP9 female.
(continued)
Plug in and turn on the sprayer. The meter should
read 105 to 125 VAC. Turn off and unplug the
Both lamps are off
sprayer.
Refer to the wiring
7. Check the microswitch (302). Reconnect the TP6
diagram below to
connectors. Connect the volt meter to TP15 male
identify the test
and TP4. The meter should read 50–125 VAC.
points (TP). points (TP).
8. Inspect the microswitch (302) button. The adjust-
ment stud should not depress the button when the
fluid pressure is zero. Depress the button with a
small screwdriver; an audible click indicates that the
microswitch is in the normal position.
9. Check the microswitch (302) continuity with an ohm
meter. Be sure the sprayer is unplugged! The meter
should read zero ohms with no fluid pressure in the
sprayer.
10.Check all the terminals for damage or a loose fit.
Reconnect the TP6 connectors.
11. Check the circuit board (71) by substituting it with a
good board. See page 28.

WIRING DIAGRAM

NOTE: These leads
have interchangeable
connections:
TP9 and TP10
TP13 and TP14
TP15 and TP16
Condition C 1. Check the circuit board (71) by removing it from the
box without disconnecting the wires; see page 28
The red lamps are
for the procedure.
on.
WARNING: Turn on the sprayer just long enough to
The clear lamp is
check the lamp condition, then shut off the sprayer.
off.
The procedure in Step 1 could allow the sprayer to
over–pressurize.
Unplug the sprayer!
WARNING: To reduce the risk of an electric shock,
handle the circuit board by the edges only! Do not al-
low any metal objects to come in contact with the cir-
cuit board.
Plug in and turn on the sprayer. The clear–colored
lamp should be on now. Turn off and unplug the
sprayer.
2 Check bourdon tube flag (B) and the position of the
detector. Reinstall the circuit board (see page 28).
Turn the pressure setting to maximum; the flag
should extend less than half way into the optical
detector slot from the bottom.
TP1
TP15
302
TP16
BLUE
WHITE
BLACK
YELLOW
RED
TP14
TP13
TP6
TP7
BLACK
GREEN
GROUND
WIRE
POWER SUPPLY CORD
WHAT TO DO
When check is not OK refer to this column
6. Allow the motor to cool. Correct the cause of
overheating. If the switch remains open after
the motor cools, check the continuity be-
tween the TP9 female and TP10 with ohm-
meter. If open, replace the motor.
7. Clean the male terminals of the microswitch.
Replace any loose or damaged terminals.
Securely reconnect the leads.
8. The microswitch is faulty. Return the sprayer
for repair.
9. The microswitch is faulty. Return the sprayer
for repair.
10.Replace any damaged terminals and recon-
nect the terminals securely.
11. Replace the circuit board. See page 28.
303
309
TP3
TP4
TP10
TP9
308
TP8
MOTOR
LEADS
WHITE
MOTOR
THERMAL SWITCH
1. Replace the circuit board. See page 28.
71
B
A
2. Perform the pressure control adjustment to
see if that corrects the problem. See page
30. If not, replace bare pressure control
(301). See page 29.
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