Koblenz/Thorne Electric UPRIGHT U-90 - Manual (Page 5)

PROBLEM POSSIBLE CAUSE SOLUTION
A) Motor does not work
1.- Not firmly plugged in. 1.- Check attachment plug.
2.- Bad ON-OFF switch. 2.- Replace switch.
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 cleaner
does not pick up/has suction
1.- Belt broken. 1.- Replace belt.
2.- Blockage air system. 2.- Remove obstruction.
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 incorrectly
1.- Worn carbon brushes. 1.- Replace brushes.
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 vibrates.
1.- Ball bearing worn out.. 1.- Replace
2.- Ball bearing holder
damaged
2.- Replace ball bearing holder.
5 DECEMBER-10