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307–758 19
LOW OUTPUT
TYPE
OF PROBLEM
WHAT
T
O CHECK
If check is OK, go to next check
WHA
T T
O DO
When check is not OK refer to this column
Low
Output
1.
Check for worn spray tip. 1. Follow
Pressure Relief Procedure W
arn-
ing
then replace tip. See
your separate gun
or
tip manual.
2.
Check
to see that pump does not continue to
stroke when gun trigger is released. Plug in
and
turn on sprayer
. Prime with paint. T
rigger
gun momentarily, then release and engage
safety
latch. Relieve pressure, turn of
f and un
-
plug sprayer.
2.
Service pump. See pages 36.
3. Check
electrical supply with volt meter
. Meter
should
read 105–125 V
AC.
3. Reset building circuit breaker; replace
building
fuse. Repair electrical outlet or try
another
outlet.
4.
Check extension cord size and length.
4.
Replace with a larger wire size cord.
5.
Check
G1
and G2 leads from bridge (308) to
circuit
board (72) for damaged
or loose wires
or connectors. Refer to the WIRING DIA-
GRAM
on Fig 27–1.
5. Clean circuit board male terminals. Re-
place
loose or defective lead terminals.
Se
-
curely
reconnect lead terminals to board.
6. Check
stall pressure. Refer
to Pressure Con
-
trol
Adjustment on page 30.
6. Perform
Pressure Control Adjustment. See
page
30.
7.
Check bridge (308) + and – leads and termi
-
nals to motor. Inspect wiring insulation and
terminals for signs of overheating. See page
27.
7.
Be
sure male terminal blades are centered
and firmly connected to female terminals.
Replace any loose terminal or damaged
wiring.
Securely reconnect wires to bridge.
8.
Check
for loose motor brush leads and
termi
-
nals.
See page 25.
8. Tighten
terminal
screws. Replace brushes
if
leads are damaged. See page 25.
9. Check for worn motor brushes which should
be
1/2” minimum. See page 25.
9.
Replace brushes. See page 25.
10.Check
for
broken and misaligned motor brush
springs. Rolled portion of spring must rest
squarely
on top of brush.
10.Replace spring if broken. Realign spring
with
brush. See page 25.
11.Check motor brushes for binding in brush
holders.
See page 25.
11.Clean brush holders, remove carbon dust
with
small cleaning brush. Align brush
lead
with
slot in brush holder to
assure free verti
-
cal
brush movement.
12.Check
circuit board (72) by substituting with
a
good
circuit board. See page 28.
12.
Replace circuit board. See page 28.
13.Check
motor armature for shorts
by using an
armature
tester (growler) or perform spin test.
See
page 22.
13.
Replace motor
. See page 34.
14. Check bridge (308) by substituting with a
good
bridge or by performing the bridge
test.
See
page 23.
CAUTION: Do not perform this check until
armature
is determined to be good. A bad ar
-
mature will immediately burn out a good
bridge.
14.Replace
bridge. See page 27.