Graco ULTRA 1000 Instructions-Parts List Manual page 14

TYPE OF PROBLEM
T
WHAT TOCHECK-
If check Is
OK,
t o t o n e x t check
I
MOTOR
W O N T
OPERATE
Diagnosing circuit board in-
dicator lamps. The normal
condition is red lamp on,
clear lamp on when board is
telling pump to run.
cedure Wernlng. Remove
Follow Preasura Rallet Pro-
gun from hose. Remove
check for faulty condition of
pressure control cover and
circuit board lamps.
Condition A both lamps on;
pump won't operate and
!motor is not running
1. Check leads from bridge
(3081
to motor to bl
sure they are securely fastened and properly
mated.
2. Check G1 and 6 2 connections between cir-
or loose terminals.
cuit board
(231
and bridge (308) for damage
I
3. Check for loose motor brush lead connec-
tions and terminals.
See
page
22.
4. Check brush length which should be 112"
minimum. See page
2 2 .
the same rate on both sides of the motor.
NOTE also that the brushes do'not wear et
5. Check for broken or misaligned motor brush
springs. Rolled portion of spring must rest
squarely on top of brush.
See
page
22.
I
6. Check motor brushes fcrbinding in brush
holders. See page
22.
7. Check motor armature commutator for burn
spots, gouges and extreme roughness.
Remove motor cover and brush inspection
plates to check. See page
2 2 .
8. Check motor armature for
shorts
using ar-
mature tester (growler) or perform spin test.
See page 19.
9.
Check bridge
(3081
by substituting with a
good bridge or performing bridge
test.
See
page
20.
armature is determined to be good. A bad
CAUTION: Do not perform this check until
armature
will
immediately burn out a good
bridge.
Condition B
Both lamps
off
Check circuit breaker (309) button to
it
has not popped up.
2. Check sprayer power supply cord (311).
Disconnect TP6 female and TP1 female and
connect voltmeter to,these leads.~ Plug in
sprayer. Meter should read 105 to 125 VAC.
Unplug sprayer. Reconnect TP1.
3. Check ON/OFF switch
(303).
Disconnect TP:
TP2 male. Plug in sprayer and turn on. Metel
and connect volt meter to TP6 female and
should read 105 to 125 VAC. Turn off and
unplug sprayer. Reconnect TP2.
4. Check iumoer wire
~ 3 0 6 1 .
Disconnect
TP3
~
.
. . .
,
.
-
. . . . . . . .
-. .
. .
and coineitvolt meter to TP6 female and
TP3 female. Plug in sprayer and turn on.
Meter should read 105 to 125 VAC. Turn off
and unplug sprayer. Reconnect TP3:
5. Check circuit breaker
(3091.
Connect volt
meter to TP6 female and TP4. Plug in
Sprayer and turn on. Meter should read 105
to 125 VAC. Turn off and unplug sprayer.
1. Replace any loose terminals end crimp to
straight and firmly connected to mating part
leads. Be sure male terminal blades are
2. Clean circuit board male terminals. Reolace
loose or damaged terminals. Securely 'recon-
nect leads.
3.
Tighten terminal screws. Replace brushes
if
leads are damaged. See page
2 2 .
4. Replace brushes. See page
2 2 .
5. Replace spring if broken. Realign spring with
brush. See page
22.
5. Clean brush holders. Remove carbon with
small cleaning brush. Align brush lead with
slot in brush holder to assure free vertical
brush movement.
7. Remove motor and have motor shop resur-
face commutator if possible. See page
3 0 .
3.
Replace motor. See page
30.
j.
Replace bridge. See page 24.
WHAT TO
DO
When check Is not OK refer t o thls column
-
I
-
~
I. Depress circuit breaker button to reset. If cir.
cuit breaker continues to open, see "Elec-
trical Short", page 18.
~
I. Depress circuit breaker button to reset. If cir.
cuit breaker continues to open, see "Elec-
trical Short", page 18.
!.
Replace power supply cord. Sea page 23
I.
Replace ON/OFF switch. See page
23.
..
Replace jumper wire. See page 24.
,,
Replace circuit breaker.
See
page 24.
Troubleshooting continued on next page.
4 307-785