Graco ULTRA AIRLESS 230-963 Instructions And Parts List page 11

OF
TYPE PROBLEM
MOTOR W O N 7
OPERATE
Diagnosing circuit board in-
dicator lamps. The normal
condition is red lamp on,
clear lamp on when board is
telling pump
to run.
Follow Pressure Relief Pro-
cedure Warning. Remove
gun from hose. Remove
pressure control cover and
check for faulty condition of
circuit board lamps.
Condition A both lamps on;
pump won't operate and
motor is not running
Condition B
Both lamps off
10
307-671
~~~~~~
WHAT TO CHECK
If check Is OK, t o next check
go
I.
Check leads from bridge 1308) to motor
to be sure they are securely fastened
and properly mated.
1. Check G1 and G2 connections between
( 3 4 0 1
and bridge 1308) for
circuit board
damage or loose terminals.
3.
Check for loose motor brush lead con-
nections and terminals. See page 27.
4. Check brush length which should be 14
mm minimum. See page 27.
NOTE also that the brushes do not wear
at the same rate on both sides of the
motor.
5.
Check for broken or misaligned motor
brush springs. Rolled portion of spring
must rest squarely on top of brush. See
2 7 .
page
6. Check motor brus'hes for binding
brush holders. See page
7.
Check motor armature commutator for
burn spots, gouges and axtreme
rouohness. Remove motor cover and
brush inspection plates to check. See
2 7 .
page
6. Check motor armature for shorts using
armature tester (growler) or perform spin
See page 15.
test.
1 3 0 8 )
9. Check bridge by substituting with
a good bridge or performing bridge test.
See page 16.
CAUTION:
D not perform this check
O
until armature is determined to be good.
A bad armature will immediately burn
out a good bridge.
1. Check electrical supply. Connect
voltmeter to electrical outlet. Meter
should read 190.250 Volts.
2. Check power supply to circuit board
with sprayer turned ON. Measure
voltage at TPl and TP2. Meter should
read 190-250 Volts. See page
3.
Check a 1 1 terminals and wires fog
damage or loose fit.
4. Check motor thermal cutout switch.
Unplug sprayer. Allow motor to cool.
Disconnect motor thermal switch leads
at TP9 to TPlO. Use ohmmeter to check
continuity. Switch should be closed
when motor is cool.
WHAT TO
If check is
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.
Replace loose or damaged terminals.
Securely reconnect leads.
3.
Tighten terminal screws. Replace
brushes if leads are damaged.
See page 27.
4. Replace brushes. See page 27.
5. Replace spring if broken. Realign spring
with brush. See page
6. Clean brush holders. Remove carbon
in
27.
with small cleaning brush. Align brush
lead with slot in brush holder to assure
free vertical brush movement.
7. Remove motor and have motor shop
resurface commutator if possible. See
page 27.
8. Replace motor. See page
9. Replace bridge. See page
1. Reset circuit breaker or replace outlet
fuse. If circuit breaker or fuse continues
to open, see "Electrical Short", page 14.
2. Unplug sprayer. Check continuity of
both poles of ONlOFF switch (302) from
TPl to TPZ, and TP2 to TP3. Replace
7.2.
switch if faulty.
Check continuity of
TP4 to TP6 and TP3 to TP5. Replace
filter if faulty.
Check power supply cord (3111 for con-
tinuity from TP5 to TP7 and TP6 to TP8.
Replace cord if faulty.
3. Replace damaged terminals and recon-
nect securely.
4. Replace electric motor if switch does not
close when motor is cool. See page
DO
NOT
OK refer t o this column
2 7 .
2 9 .
20.
filter (3101 from
RFI
2 9 .