Basic Problem Solving
TYPE OF
PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column
Electrical
(continued)
7. Check leads from pressure transducer and motor
to motor control board (47) to be sure they are se-
curely fastened and properly mated.
7. Replace loose terminals; crimp to leads.
Be sure male terminal blades are straight
and firmly connected to mating part.
8. Check motor control board (47) by substituting with
a good board.
CAUTION:
Do not perform this check until motor
armature is determined to be good. A bad motor
armature can burn out a good board.
8. Replace board. See page 29.
9. Check power supply cord (50). Disconnect black
and white power cord terminals; connect volt
meter to these leads. Plug in sprayer. Meter should
read 105–125 VAC. Unplug sprayer.
9. Replace power supply cord. See page
29.
10. Check ON/OFF switch (52). Disconnect the “L”
wire between motor control board (47) and switch
and connect volt meter between exposed terminal
switch and power cord’s white wire. Plug in
sprayer and turn
ON
. Meter should read 105–125
VAC. Turn off and unplug sprayer.
10. Replace ON/OFF switch. See page 29.
11. Check motor thermal cutout switch. Connect ohm-
meter between motor’s red leads. Meter should
read 1 ohm maximum.
11. Allow motor to cool. Correct cause of
overheating. If switch remains open after
motor cools, replace motor.
12. Check the transducer (29) by replacing it with a
new one.
12. Replace pressure transducer. See page
32.
13. Check pressure adjustment potentiometer (64) by
replacing it with a new one.
Intermediate Problem Solving
TYPE OF
PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Low Output
1. Check for worn spray tip.
1. Follow
Pressure Relief Procedure
Warning
then replace tip. See your
separate gun or
tip manual.
2. Be sure pump does not continue to stroke
when gun trigger is released. Plug in and
turn on sprayer. Prime with paint. Trigger gun mo-
mentarily, then release and engage safety latch.
Relieve pressure, turn off and unplug sprayer.
2. Service pump. See page 24.
3. Release gun trigger. Observe resting position of
pump rod (107).
3. If pump consistently comes to rest
with rod (107) fully extended, the piston
packings and/or piston valve may be
worn. Service the pump. See page 24.
4. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
4. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or
try another outlet.
5. Check extension cord size and length.
5. Replace with a correct, grounded exten-
sion cord. Note that long lengths and/or
smaller gauges reduce performance.
6. Check motor brushes. See Electrical – What To
Check, item 4, on page 17.
6. See page 23.