Graco ULTRA 1000 Instructions-Parts List Manual page 14

YPE OF PROBLEM
morOR WONT OPERATE
liagnosing circuit board in-
icator lamps. The normal
mdition is red lamp on,
laar lamp on when board is
?Uing pump
to run.
ollow Praseura Rellef Pro-
edure Wernlng. Remove
un from hose. Remove
rasure control cover and
heck for faulty condition of
ircuit board lamps.
ump won't operata and
ondition A both lamps on;
lotor is not running
mdition B
Dth lamps off
WHAT TO CHECK
If
check Is
OK,
t o to next check
1.
Check leads from bridge (308)
to
motor to bt
sure they are securely fastened and properly
mated.
2. Check G1 and 6 2 connections between cir-
or loose termlnels.
cuit board (23) and bridge (308) for damage
3. Check for loose motor brush lead connec-
tions and terminals. See page
2 2 .
4. Check brush length which should be 1/2"
minimum. See page
22.
NOTE also that the brushes do not wear at
the same rate on both sides of the motor.
5. Check for broken or misaligned motor brush
squarely on top of brush. See page
2 2 .
springs. Rolled portion of spring must rest
6. Check motor brush&for binding in brush
holders. See page
2 2 .
7. Check motor armature commutator for burn
spots, gouges and extreme roughness.
Remove motor cover and brush inspection
plates to check. See page 22.
mature tester (growler) o r perform spin test.
See page 19.
8.
Check motor armature for shorts using ar-
9. Check bridge ( 3 0 8 1 by substituting with a
good bridge or performing bridge test. See
page
20.
CAUTION: Do not perform this check until
armature is determined to be good. A bad
armature will immediately burn out a good
bridge.
1.
Check circuit breaker (309) button to be sure
it has not popped up.
2. Check sprayer power supply cord 1311).
Disconnect TP6 female and TP1 female and
sprayer. Meter should reed 105 to 125 VAC.
connect volt meter to these leads. Plug in
Unplug sprayer. Reconnect TPI.
3. Check ONlOFF switch
(303).
Disconnect TP2
and connect volt meter to TP6 female and
TP2 male. Plug in sprayer and turn on. Meter
should read 105 to 125 VAC. Turn off and
unplug sprayer. Reconnect TPZ.
4. Check jumper wire (306). Disconnect TP3
and connect volt meter to TP6 female and
TP3 female. Plug in sprayer and turn on.
Meter should read 1 0 5 to 125 VAC. Turn off
and unplug sprayer. Reconnect TP3.
5. Check circuit breaker (309). Connect volt
meter to TP6 female and TP4. Plug
in
sprayer and turn
on.
Meter should read 105
to 125 VAC. Turn off and
undue
smyar.
WHAT TO DO
When check Is not
OK
refer to thls columl
1.
Replace any
loose
terminals end crimp to
leads. Be sura male terminal blades are
straight and firmly connected to mating pert
loose
or damaged terminals. Securely recon.
nect leads.
3. Tighten terminal screws. Replace brushes if
leads are damaged. See page
22.
4. Replace brushes. See page
2 2 .
2. Clean circuit board male terminals. Replace
5. Replace spring if broken. Realign spring witt
brush. See page
22.
6. 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
30.
6. Replace motor. See page 30.
9. Replace bridge. See page 24.
~
1. Depress circuit breaker button to reset. If cir.
cuit breaker continues to open, see "Elec-
trical Short", page 18.
~~
2.
Replace power supply cord. See page
23.
3.
Replace ON/OFF switch. See page
23.
1 . Replace jumper wire. See page 24.
5. Replace circuit breaker. See page 24.
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Jmubleshooting continued on next page.
14
307-785