Type Of Problem - Graco A Series Instructions-Parts List Manual

tndition
B
ontinued)
Dndition C
3d
lamp on, clear lamp off
nplug spreverl
CCheck motor thermal cutout switch.
~~
female. Plug in arid turn on sprayer. Meter
Connect volt meter to TP6 female and TP9
should read 106 to 125 VAC. Turn off end
unplug sprayer.
7. Check microswitch (302). Reconnect TP6
connectors. Connect volt meter
v)
TP16
male and TP4. Meter should read 50-125
VAC.
8.
Visually inspect microswitch
1 3 0 2
button.
M{uatmant stud
(QI
should mt dapress
t h a
microswitch button when fluid pressure is
with small screwdriver; an audible click in-
zero. Manually check by depressing button
dicates microswitch is in normal position.
9. Check microswitch
13021
continuity with ohm
should read zero ohms with no fluid pressure
meter. Be sure sprayer is unplugged1 Meter
in the sprayer.
10.Check all terminals for damage or loose
fa.
Reconnect TP6 connectors.
11.Check circuit board (23) by substituting with
a spzd board. See page 25.
1. Check circuit board
I 2 3 1
by removing from
25 for removal procedure.
box without disconnecting wires; see page
WARNING: Removing the circuit board
while still wired over-rides the optical detac-
tor which could causa 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
with the board1
allow any metal objects to coma in contact
Plug in and turn on sprayer. Clear lamp
should be on now
-
removing the circuit
off end unplug sprayer.
board over-rides the optical detector. Turn
2. Check bourdon tube flag and detector posi-
tion. Reinstall circuit board (sea page
25).
Turn pressure setting to maximum; flag
should extend less then half way into optical
detector slot from the bottom.
TYPE OF PROBLEM WHAT TO CHECK
If check Is
OK,
80
to next check
WHAT TO DO
When check Is not OK referto
this
column
-
-
cc
(C
6
7
0
I C
I
1
1
-
"
"
-
CI
Rt
U,
1
I
-
L
-
When replacing the bare pressure control
box
13011, remove the circuit breaker.
bridge,
circuit
board and
electrical hardware
end
reinstall in
the
new
bare box.
~~
VIEW OF OPTICAL DETECTOR AND FLAG
i. Allow motor to m o l . Correct cause of over-
heating. If switch remains open after 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
capair.
I . Micmswitch is faulty. Return sprayer for
repair.
lO.Replace damaged terminals and reconnect
securely.
l1.Replace circuit board.
See
page
2 5 .
i
.
Replace circuit board. See page
2 5 .
2. Calibrate pressure control to
see
if
that cor-
rects problem.
See
page
27.
If not, replace bare pressure control box
(301P. See page 26.
Troubleshooting continued on nextpege