Graco E Series Instructions-Parts List Manual page 14

OF
'YPE PROBLEM
Diagnosing circuit board
indicator lamps. The nor-
mal condition is red lamp on,
clear lamp on when boardis
Follow Pressure Relief
Procedure Warning. Re-
move gun from hose. Re-
move pressure control cover
and check for faulty condi-
tion of circuit board lamps.
Condition A
Both lamps on; pump
won't operate and motor
not
is running
WIRING DIAGRAM
14
WHAT TO CHECK
is
If check OK, go to the next check.
be sure they are securely fastened ana
properly mated.
GI
and connections between
circuit board (118) and bridge (308) for
damage or loose terminals.
3. Check for loose motor brush lead connec-
tions and terminals. See page 33.
Checkbrush length which should be
4.
minimum. See page 33.
NOTE: The brushes do not wear at the
same rate on both sides
Check both brushes.
5. Check for brocen or misaligned motor
6. Check motor brushes for binding in brush
holders. See page 33.
7. Check motor armature commutator for
burn spots, gouges and extreme rough-
ness. Remove motor cover and brush in-
mature tester (growler) or perform spin
test. See page 19.
3. Check bridge (308) by substituting with a
good bridge or performing bridge test. See
page
Do
CAUTION:
not perform this check until ar-
mature is determined to be good. A bad ar-
mature will immediately burn out a good
bridge.
DO
WHAT TO
If check is not OK, refer to this column.
1. Replace any loose terminals and crimp to
straight and firmly connected to mating
part.
Clean circuit board male terminals. Re-
2.
place loose or damaged terminals. Se-
3. Tighten terminal
if leads are damaged. See page
brushes
33.
mm Replace brushes. See page 33.
14 4.
the motor.
5. Replace spring if broken. Realign spring
with brush. See page 33.
6. Clean brush holders. Remove carbon
with small cleaning brush. Align brush
leads with slot in brush holder to assure
free vertical brush movement.
7. Remove motor and have motor S h O D
resurface commutator if possible. see
page 35.
8. Replace motor. See page 35
9. Replace bridge. See page
screws. Replace
24
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