Koblenz/Thorne Electric U-40 Iii.-Troubleshooting Chart, Problem, Possible Cause, Solution

Models: U-40

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III.-TROUBLE SHOOTING CHART.

NOTE: Drawing numbers are for identification purposes only.

III.-TROUBLE SHOOTING CHART.

PROBLEM

POSSIBLE CAUSE

SOLUTION

 

1.- Not firmly plugged in.

1.- Check attachment plug.

A) Motor does not

2.- Bad ON-OFF switch.

2.- Replace switch.

work

3.- Line cord open

3.- Replace cord.

 

4.- Motor open

4.- Check motor and wiring.

 

5.- Fan blockage by material

5.- Remove obstruction

B) Motor works but

1.- Belt broken.

1.- Replace belt.

cleaner does not

2.- Blockage air system.

2.- Remove obstruction.

aspire

3.- Fan broken.

3.- Replace fan.

 

4.- Worn brush roller.

4.- Replace brush roller.

 

5.- Motor slow.

5.- Check carbon brushes.

 

6.- Bag full.

6.- Empty bag (or change paper bag).

C) Motor works er-

1.- Worn carbon brushes.

1.- Replace brushes.

ratically

2.- Detective armature.

2.- Check spark, replace

 

3.- Bad electrical connection.

3.- Check wiring.

 

4.- Detective On-Off switch.

4.- Replace switch.

D) Brush roll vi-

1.- Ball bearing worn out..

1.- Replace

brates.

2.- Ball bearing holder damaged

2.- Replace ball bearing holder.

E) Head light does

1.- Bad connections.

1.- Check wiring.

not run on

2.- Light bulb burned out.

2.- Replace bulb.

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Koblenz/Thorne Electric U-40 service manual Iii.-Troubleshooting Chart, Problem, Possible Cause, Solution