TYPE
OF
PROBLEM
WHAT
TO
CHECK
If check
is
OK,
go to the next check.
1.
Check for worn spray tip.
2. Check
to
see that Dum0 does
not
con
-
tinue to stroke whbn gh trigger is re
-
leased. Plug in and turn on sprayer.
Primewith
paint.Triggergun momentar
-
ily, then release and engage safety
latch. Relieve pressure, turn
off
and
un
-
plug sprayer.
3. Check electrical supply with
volt
meter.
Meter should read
190-250
Volts.
4. Check extension cord size and length;
must be at least 12 gauge wire and no
longer than
15,2 m .
5. Check
G1
and G2 leads from bridge
(308) to circuit board (1 18) for damage
or
loose
wires or connectors. Refer
to
page 26.
6.
Check stall pressure. Refer
to
Calibra
-
tion Procedure on page 28.
7. Check bridge (308)
+
and
-
leads and
terminalstomotor. Inspect wiring insula
-
tion and terminals for signs of overheat
-
ing. See page 24.
8. Check for loose motor brush leads and
terminals. See page 33.
9.
Check for worn motor brushes which
should be 14 mm minimum. See page
33.
10.Checkfor broken and misaligned motor
brush springs. Rolled portion of spring
must rest squarely
on
top of brush.
11.Check motor brushes for binding in
brush holders. See page 33.
12.Checkcircuit board (1 18) by substituting
with a good circuit board. See page
26.
13.Check motor armature for shorts by
us
-
ing an armature tester (growler) or per
-
form spin test. See page 19.
14,Checkbridge(308)bysubstitvtingwitha
good bridge or by performing the bridge
test. See page
20
or 24.
CAUTION:
Do
not perform this check until
armature is determined
to
be good.
A
bad
armature will immediately burn out a good
bridge.
WHAT
TO
DO
If
check
is
not
OK,
refer to this column.
1.
Follow Pressure Relief Procedure
Warning then replace tip. See
you1
separate gun or tip manual.
2. Service pump. See manual 307
-
793.
3. Reset building circuit breaker; replace
building fuse. Repair electrical
outlet
or
try
another outlet.
4. Replace with a correct, grounded exten
-
sion cord.
5. Clean circuit board male terminals. Re
-
place loose or defective lead terminals.
Securely reconnect lead terminals to
board.
6.
Calibrate pressure control. See page 28.
7.
Be
sure male terminal blades are cen
-
tered and firmly connected
to
female ter
-
damaged wiring. Securely reconnect
minals. Replace any
loose
terminal or
wires to bridge.
8. Tighten terminal screws. Replace
brushes
if
leads are damaged. See page
33.
9. Replace brushes. See page 33.
10.Replace spring
if
broken. Realign spring
with brush. See page 33.
11.Clean brush holders, remove carbon
dust with small cleaning brush. Align
brush lead with slot in brush holder to as
-
sure free vertical brush movement.
12.Replace circuit board.
See
page
26.
13.Replace motor.
See
page 35.
14.Replace bridge.
See
page 24.
16
307
-
670
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