Sherwin-Williams ULTIMATE NOVA 1000 Service Manual download pdf (Page 14)

TYPE OF PROBLEM

MOTOR WON’T OPERATE

WHAT TO CHECK

WHAT TO DO

If check is OK, to to next check

When check is not OK refer to thii column

Diagnosing circuit board in-

1. Check leads from bridge 13081 to motor to be 1. Replace any loose terminals and crimp to

dicator lamps. The normal

sure they are securely fastened and properly

leads. Be sure male terminal blades are

condition is red lamp on,

mated.

straight and firmly connected to mating part.

clear lamp on when

boerd is

telling pump to run.

2. Check Gl and G2 connections between cir-

2. Clean circuit board male terminals. Replace

cuit board (23) and bridge 008) for damage loose or damaged terminals. Securely recon-

Follow Pressure Relief Pro-

or loose terminals. nect leads.

cedure. Remove gun from

hose. Remove pressure con-

3. Check for loose motor brush lead connec- 3. Tighten terminal screws.

Rapl8Ce

brushes if

trol cover and check for faulty

tions and terminals. See page 22. leads are damaged. See page 22.

condition of circuit board

lamps. 4. Check brush length which should be l/2” 4. Replace brushes. See page 22.

minimum. See page 22.

Condition A both lamps on;

NOTE: Brushes do not wear at the same

pump won’t operate and

rate on both sides of motor.

motor is not running

5. Check for broken or misaligned motor brush 5. Replace spring if broken. Realign spring with

springs. Rolled portion of spring must rest brush. See page 22.

squarely on top of brush. See page 22.

6. Check motor brushes for binding in brush

holders. Sea page 22.

6. Clean brush holders. Remove carbon with

small cleaning brush. Align brush lead with

slot in brush holder to assure free vertical

brush movement.

7. Check motor armature commutator for burn 7. Remove motor and have motor shop resur-

spots, gouges and extreme roughness. face commutator if possible. See page 36.

Remove motor cover and brush inspection

plates to check. See page 22.

8. Check motor armature for shorts using ar- 8. Replace motor. See page 36.

mature tester (growler) or perform spin test.

See page 19

9. Check bridge (3!38) by substituting with a 9. Replace bridge. See page 24.

good bridge or performing bridge test. See

page 20.

CAUTION: Do not perform this check until

armature is determined to be good. A bad

armature will immediately burn out a good

bridge.

Condition B

Both lamps off

1. Check circuit breaker 069) button to be sure

1. Depress circuit breaker button to reset. If cir

it has not popped up. cuit breaker continues to open, see “Elec-

trical Short”, 18.

2. Check sprayer power supply cord (311).

2. Replace power supply cord. See page 23.

Disconnect TP6 female end TPl female and

connect volt meter to these leads. Plug in

sprayer. Meter should read 105 to 125 VAC.

Unplug sprayer. Reconnect TPl.

3. Check ON/OFF switch 003). Disconnect TP2 3. Replace ON/OFF switch. See page 23.

and connect volt meter to TP6 female and

TP2 male. Plug in sprayer and turn on. Meter

should read 105 to 125 VAC. Turn off and

unplug sprayer. Reconnect TP2.

4. Check jumper wire KIO6). Disconnect TP3

4. Replace jumper wire. See page 24.

and connect volt meter to TP6 female and

TP3 female. Plug in sprayer and turn on.

Meter should read 105 to 125 VAC. Turn off

and unplug sprayer. Reconnect TP3.

5. Check circuit breaker 009). Connect volt 5. Replace circuit breaker. See page 24.

meter to TP6 female and TP4. Plug in

sprayer and turn on. Meter should read 105

to 125 VAC. Turn off and unplug sprayer.

Troubleshooting continued on nextpege.

820-047

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Sherwin-Williams ULTIMATE NOVA 1000 Service Manual Page 14

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