Graco B Series Instructions-Parts List Manual page 13

Type of Problem
:ondlUon B (continued)
loth lamps off
IEFER TO THE WIRING DIA.
:RAM
ON
PAGE
12
' 0 IDENTIFY
TP
POINTS.
:ondltlon C
led lamps on,
Xear lamp off
Jnplug sprayer!
I
What
to
Check
If
check
is OK, go to the next check
1. Checkelectricalsuppl Connectvoltmetel
to electrical outlet. iieter should reac
2. Check power supply to circuit board witt
spra erturnedON. MeasurevoltageatTPl
andtb2.Metershouldread190-250Volts.
190-250 Volts.
3. Checkallterminalsandwiresfordamageol
loose
ft.
4.
Checkmotorthermalcutoutswitch.Unplug
motor thermal switch leads at TP9
ana
sprayer. Allow motor to cool. Diconnec!
TP10. Use ohmmeter to check continuity.
Switch should be closed when motor
IS
5. Check microswitch (306). Wah no fluid
cool.
pressure in the pressure control, discon.
nectwiresTP16andTP19,Checkcontinuity
across switch terminals with an ohmmeter.
Switch contact should be closed. Depress
actuatorbutlon.Anaudible'click"indicates
the contacts have opened. Ohmmeter
should read iniinitv.
~ ~
~.
. . ~ ~
6. Checkcircuiboar~(72)bysubstitutingwitt
a good board.
1.
Check circuit board
(72)
by removing from
boxwithoutdisconnectmg wires; seepage
24
for removal procedure.
should be on now
-
removing the circuil
Plug in and turn on sprayer. Clear lamp
and unplug the sprayer.
boardoverridestheopticaldetector.Tumofi
-
"
r l
I
I 2
' 3
1 4
t
I
1 5
1 6
-_
I 1
-
~~ ~~ ~ ~
What to
Do
I f
check is not OK, refer to this column
.
Resetcircuitbreakerorreplaceoutletfuse.1
circult breaker or fuse continues to open
see "Electrical Short", page 18.
I .
Unplug s rayer Check continuity of bot)
oles of 8NIOFF switch (302) from TP3
t(
~P4andTP6toTPG.Replaceswitchiffaulty
See page 20.
to
TPB and TP9 to TP10. Replace filter i
CheckcontinuityofRFIfitter(310)fromTPi
bully.
See page
22.
Checkpowersu plycord 3ll)forcontinu
pace
v
cord if
faulty.
See page 20.
frOmTP11tOfPl2and'/P13toTP14.Re
Check for any loose connections.
,.
Replacedamagedterminalsandreconnec
securely.
.
Replace electric motor if switch does no'
dose when motor is cool. See page 30.
.
Replace the microswitch. See page
23.
.
Replace circuit board. See page 24.
.
Replace circuit board. See page
24.
WARNING:
Removing the circuit board while still wired overrides the
optical detector which could cause the sprayer to over-pressurize, if the
microswitch does not function 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 allow any metal objects to come in contact with the boardl
307-889 13