Graco ULTRA 1000 Instructions-Parts List Manual page 15

h Y P E OF PROBLEM
(Continued)
Condition B
Condition C
Red lamp on, dear lamp off
Unplug sprayerl
WHAT TO CHECK
If
check is OK,
go
t o next check
h Y P E OF PROBLEM
WHAT TO CHECK
If check is OK,
go
t o next check
(Continued)
Condition B
Condition C
Red lamp on, dear lamp off
Unplug sprayerl
6. Check motor thermal cutout switch.
female. Plug in and
turn
on sprayer. Meter
Connect volt meter to TP6 female and TP9
should read 105 to
125
VAC. Turn
off
and
unplug sprayer.
7. Check microswitch (3021. Reconnect TP6
connectors. Connect volt meter to TP15
male and TP4. Meter should read 50-125
VAC.
8. Visually inspect microswitch (302) button.
microswitch button when fluid prassure is
Adjustment stud
((1)
should not depress the
zero. Manually check by depressing button
with small screwdriver; an audible click in-
dicates microswitch is in normal position.
9.
Check microswitch (302) continuity with ohr
should read zero ohms with no fluid pressur,
meter. Be
sure
sprayer is unpluggedl Meter
in the sprayer.
"
10.Check a 1 1 terminals for damage or loose fit.
Reconnect TP6 connectors.
1l.Check circuit board
( 2 3 1
by substituting with
a good board. Sea page
25.
1. Check circuit board
( 2 3 1
by removing from
box without disconnecting wires; see page
25 for removal procedure.
WARNING: Removing the circuit board
while stili wired over-rides the optical detec-
tor which could cause the sprayer to over-
pressurize, if the micmswitch does not func.
tion properly. Turn the sprayer on ONLY
long enough to check lamp condition, then
WARNING: To reduce the risk of electric
shut
off
immediately.
shock, handle board by edges onlyl Do not
with the boardl
ellow any metal objects to come in contact
Plug in and turn on sprayer. Clear lamp
should be on now
-
removing the circuit
board over-rides the optical detector. Turn
off end 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 half way into optical
detector slot from the bottom.
VIEW OF OPTICAL DETECTOR AND FLAG
i. Allow motor to cool. Correct ceuse of over-
heating. If switch remains open after motor
wok,
check continuily bemeen TP9 female
and TP10 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
securely.
1 .Replace circuit board. See page 25.
.
Replace circuit board. See page
2 5 .
.
Calibrate pressure control to see if that cor-
rects problem. See page 27.
If not. replace bare pressure control box
(301)'. See page 26.
WHAT TO DO
When check la not OK refer to this column
E
7
'When replacing the
bare
pressure control box
I301l.
remove
the
circult breaker,bridge.
circuit board and
eiectrical
hardware and reinnail in
the
new bare box.
Troubleshooting continued on next page.