Repair - Graco 231-043 Instructions-Parts List Manual

MOTOR WON'T OPERATE
TYPE OF PROBLEM
Condition B (continued)
Both lamps off
REFER TO THE WIRING
DIAGRAM BELOW T O IDEN-
TIFY TEST POINTS (TP)
Condition C
Red lamps on,
Clear lamp off
Unplug sprayer!
.
WHAT TO CHECK
If check is OK, go to next check
6. Check motor thermal cutout switch. Connect
volt meter to TP6 female and TP9 female.
Plug in sprayer and turn on. Meter should read
105 to 125 VAC. Turn off and unplug sprayer.
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. Ad-
justment stud should not depress button when
fluid pressure is zero. Depress button with
small screwdriver; 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 (71) by substituting with a
good board. See page 28.
WIRING DIAGRAM
TP1
TP15
302
TP16
BLUE
WHITE
BLACK
YELLOW
RED
TP14
TP13
TP6
TP7
NOTE: These leads have
GREEN
interchangeable
GROUN
connections:
WIRE
TP9 and TP10
TP13 and TP14
TP15 and TP16
1. Check circuit board (71) by removing from box
without disconnecting wires; see page 28 for
removal procedure.
WARNING: Removing circuit board while still
wired overrides optical detector which may cause
sprayer to over pressurize, if microswitch does
not function properly. Turn sprayer on ONLY long
enough to check lamp condition, then shut off im-
mediately.
WARNING: To reduce risk of electric shock,
handle board by edges only! Do not allow any
metal objects to come in contact with board!
Plug in and turn on sprayer. Clear lamp should
be on now. Turn off and unplug sprayer.
2. Check bourdon tube flag and detector posi-
tion. 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.
WHAT TO DO
When check is not OK refer to this column
6. Allow motor to cool. Correct cause of over-
7. Clean microswitch male terminals. Re-
8. Microswitch is faulty. Return sprayer for
9. Microswitch is faulty. Return sprayer for
10.Replace damaged terminals and recon-
11. Replace circuit board. See page 28.
303
BLACK
WHITE
MOTOR
D
THERMAL SWITCH
POWER SUPPLY CORD
1. Replace circuit board. See page 28.
2. Perform pressure control adjustment to see
heating. If switch remains open after motor
cools, check continuity between TP9 fe-
male and TP10 with ohmmeter. If open, re-
place motor.
place loose or damaged terminals. Se-
curely reconnect leads.

repair.

repair.
nect securely.
309
TP3
TP4
TP10
TP9
308
TP8
MOTOR
LEADS
FLAG
CIRCUIT
BOARD
OPTICAL
DETECTOR
if that corrects problem. See page 30.
If not, replace bare pressure control box
(301). See page 29.
01222