Graco 231-032 A Series Instructions And Parts List page 15

YPE OF PROBLEM
ondition B
bntinued)
ondition
C
"
hen replacing the
bars prssaure wntml box
C301l .
remove
the circun breaker.
dge,
circuit board and
alenrical hardware
and
r e i M t a l l
in the new
bars box.
hen
WHAT TO CHECK
If check Is OK,
go t o next check
6.
Check motor thermal cutout switch.
Connect volt meter to TP6 female and TP9
female. Plug in and turn on sprayer. Meter
should read 105 to 125 VAC. Turn off and
unplug sprayer.
7.
Check microswitch (3021. Reconnect TP6
connectors. Connect volt mater to TP15
male and TP4. Meter should read 50-125
VAC.
8. Visually inspect microswitch
1 3 0 2 1
button.
Adjustment stud (Q) should not depress the
microswitch button when fluid pressure is
zero. Manually check by depressing button
with small screwdriver; an audible click in-
dicates microswitch is in normal position.
9. Check microswitch 1302) continuity with ohm
meter. Be sure sprayer is unplugged1 Mater
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 25.
1. Check circuit board (23) by removing from
25 for removal procedure.
box without disconnecting wires; see page
while s t i l l wired over-rides the optical detec-
WARNING: Removing the circuit board
tor which could cause the sprayer to over-
tion properly. Turn the sprayer on OML Y
pressurize, if the microswitch does not func-
shut off immediately.
long enough to check lamp condition, than
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 boardl
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-
tion. Reinstall circuit board (see page
251.
Turn pressure setting to maximum; flag
should extend less than haif way into optical
detector slot from the bottom.
VIEW OF OPTICAL DETECTOR AND FLAG
and
r e i M t a l l
in the new
bars box.
box
C301l .
remove
the circun breaker.
WHAT TO DO
When check le not OK refer to thls column
i .
Allow motor to cool. Correct cause of over-
heating. If switch remains open etter motor
cools,
check continuity between TP9 female
and TPlO with ohmmeter. If open, replace
motor.
'.
Clean microswitch male terminals. Replace
loose or damaged terminals. Securely recon-
nect leads.
I.
Microswitch is faulty. Return sprayer for
repair.
I.
Microswitch is faulty. Return sprayer for
repair.
0.Replace damaged terminals and reconnect
1 .Replace circuit board. See page 25.
securely.
.
Replace circuit board. See page 25.
!.
Calibrate pressure control to see if chat cor-
rects problem. See page 27.
If not, replace bare pressure control box
(3011'. See page
26.
Troubleshooting continued on nextpage