Graco ULTRA 1000 Instructions-Parts List Manual page 15

WHAT
TO
CHECK
If check is OK,
(10
to next check
-
8. Check motor thermal cutout switch.
Connect volt meter to TP8 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 L 3 0 2 1 . Reconnect TP6
connectors. Connect volt meter to TP15
male and TP4. Meter should read 50-125
VAC.
8.
Visually inspect microswitch
( 3 0 2 1
button.
Adjustment stud
IQl
should not depress the
zero. Manually check by depressing button
microswitch button when fluid pressure is
with small screwdriver; en audible click in-
dicates microswitch is in normal position.
9. Check microswitch
( 3 0 2 1
continuity with ohn
should read zero ohms with no fluid pressurl
meter. Be sum sprayer is unplugged1 Meter
in the spreyer.
-.
10.Check all terminals for damage or loose fit.
Reconnect TP6 connectors.
11.Check circuit board
1 2 3 )
by substituting with
a good board. See page
2 5 .
~~
1. Check circuit board (23) by removing from
box wirhout disconnecting wires; see page
25 for removal procedure.
~~
WARNING: Removing the circuit board
while still wired over-rides the optical detec-
tor which could cause the spreyer to over-
pressurize, if the microswitch does not func-
tion properly. Turn
t h e
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 only1 Do not
allow any metal objects to come in contact
with the boerdl
should be on now
-
removing the circuit
Plug in and turn on sprayer. Clear lamp
board over-rides, the optical detector. Turn
off and unplug sprayer.
2. Check bourdon tube flag and detector posi-
tion. Reinstall circuit board {see pege
7.5).
should extend less then half wsy into optical
Turn pressure setting to maximum; Rag
detector slot from the bottom.
VIEW OF OPTICAL DETECTOR AND FLAG
-
WHAT TO DO
When check Is not
OK
refer to this column
6.
Allow motor to cool. 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.
7. Clean microswitch male terminels. Replace
loose or damaged terminals. Securely recon-
nect leads.
8. Microswitch is faulty. Return sprayer for
repair.
3.
Microswitch is faulty. Return sprayer for
reDair.
10.Repiace damaged terminals end reconnect
securely.
11.Replace circuit board. See page 25.
I. Replace circuit board. See page
7.5.
~ ~~ ~~
?.
Calibrate pressure control to
see
if that cor-
rects problem. See pane
n.
If not, replace bare pressure control box
(301
I*.
See page
26.
. -
'When replacing the bare prmure wntml box I301 i , remove
the
circuit breaker,bridge.
circuit board and elettrical herdware and reinstall in the new
bare box.
Troubleshooting continued on next page.
307-785 16