Magnum 232735, Repair And Parts Manual

Advanced Troubleshooting 

16

309226M

Basic electrical problems.

Motor overheated.

Allow motor to cool for 30 minutes. Retry.

Electrical outlet is damaged.

Reset building circuit breaker or replace fuse. Try 
another outlet.
Check electric supply with volt meter. Meter must 
read 85 to 130V AC. If voltage is too high, do not 
plug sprayer in until outlet is corrected.

Control board leads are 
improperly fastened or 
improperly mated.

Replace any loose terminals. Make sure all leads 
and harnesses are firmly connected. 
Check pressure control harness connection on 
front side of drive housing.
Clean control board terminals. Securely reconnect 
leads.

Motor brushes are worn.

Check length of BOTH brushes (brushes do not 
wear evenly on both sides of the motor). Brush 
length must be 0.25 in. (6.4mm). If brushes are 
worn replace motor using 

Motor Kit, 

page 22.

Motor armature commutator 
damaged.

Check for burn spots, gouges and extreme 
roughness. Have motor shop resurface 
commutator if possible, or replace motor using 

Motor Kit

, page 22.

Fuse is blown.

Replace fuse using 

Fuse Kit

, page 22.

Motor armature shorting.

Check for shorts using armature tester (growler) 
or perform spin test, 

Motor Diagnostic

, page 24. 

If shorts are evident, replace motor using 

Motor 

Kit

, page 22.

Control board damaged.

CAUTION: 

Do not perform 

control board diagnostics until 
you have determined the 
armature is good. A bad 
armature can burn out a good 
control board.

See 

Control Board Diagnostics

, page 25. 

Replace control board if damaged using 

Control 

Board Kit

, page 22.

Sprayer Wiring Problems

NOTE: 

Remove enclosure 

mounting screws and pull 
enclosure away from drive 
housing. Take care not to pull 
on leads from electrical cord 
and power switch.

Sprayer electrical cord 
damaged.

1. Unplug sprayer electrical cord. 
2. Disconnect black electrical cord wire at 

power switch.

3. Unplug in-line connection white cord wire.
4. Plug in electrical cord.
5. Test voltage between black and white 

wires. Meter must read 85 to 130V AC.

6. Replace electrical cord if no voltage.

Sprayer power switch 
damaged.

1. Unplug sprayer electrical cord.
2. Disconnect black control board wire at 

power switch.

3. Unplug in-line connection white cord wire.
4. Plug in electrical cord.
5. Turn power switch ON.
6. Test voltage between open terminal of 

power switch and white electrical cord wire. 
Meter must read 85 to 130V AC.

7. Replace power switch if no voltage.

Specific Problem

Cause

Solution