‘YPE
OF
PROBLEM
Diagnosing circuit board
indicator lamps. The nor
-
mal condition
is
red lamp on,
clear lamp on when
boardis
telhg pump
to
run.
Procedure Warning.
Re-
Follow Pressure Relief
move gun from hose. Re
-
move pressure control cover
tion of circuit board lamps.
and check for faulty
condi-
Condition
A
won’t operate and motor
Both lamps on; pump
is
not
running
WIRING DIAGRAM
WHAT TO CHECK
If
check
is
OK,
go
to the next check.
1.
Check leads from bridge
(308)
to
motor tc
be sure they are securely fastened ana
properly mated.
2.
Check
GI
and
G2
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.
4.
Checkbrush length which should be
14
mm
minimum. See page 33.
NOTE:
The brushes do not wear at the
same rate on both sides
of
the motor.
Check both brushes.
5.
Check for brocen or misaligned motor
brushsprings.Rolledportionofspringmust
reslsquarrelyontopofbrush.Seepage33.
6.
Check motor brushes for binding in brush
holders. See page 33.
7.
Check motor armature commutator for
burn spots, gouges and extreme
rough-
spection plates
to
check. See page 28.
ness. Remove motor cover and brush
in-
3.
Check motor armature for shorts using ar
-
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
20.
CAUTION:
Do
not perform this check until ar
-
mature is determined to be good.
A
bad ar
-
mature
will
immediately burn out a good
bridge.
I
302
WHAT
TO
DO
If
check is not
OK,
refer to this column.
1. Replace any loose terminals and crimp to
leads. Be sure male terminal blades are
straight and firmly connected to mating
part.
2.
Clean circuit board male terminals. Re
-
curely reconnect leads.
place loose or damaged terminals.
Se-
3. Tighten terminal screws. Replace
33.
brushes
if
leads are damaged. See page
4.
Replace brushes. See page 33.
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 ShOD
resurface commutator
if
possible. see
page 35.
8. Replace motor. See page 35
9. Replace bridge. See page
24
!
14
307-670
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