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Maintenance procedures have the potential for severe shock hazard and should be
performed by qualified personnel.
Trouble
No Power
Faulty braking
Speed Control does not work
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MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Probable Cause
Fuse
Power Switch
Power Cord
Transformer
Circuit Board
Circuit Board
Speed Potentiometer
Circuit Board
23
Solution
Disconnect Power Cord. Replace fuse.
Disconnect Power Cord. Use ohmmeter to check
yellow and black leads at Switch. Reading should
be 0 to full scale when switched from on to off.
Use Voltmeter to check white lead at terminal
block and black lead at Switch. Reading should
be 115 VAC for Model EC24N and 230VAC for
Model EC24E.
Use voltmeter to check the two yellow leads from
the Transformer. Reading should be 24 VAC.
Replace the Circuit board.
Replace the Circuit Board.
Disconnect Power Cord. Unplug the Socket As-
sembly from Circuit Board. Using an ohmmeter,
check the yellow and orange leads at the poten-
tiometer by rotating the knob. Reading should be
0 to 50,000 ohms.
Replace the Circuit Board.
(Dwg. TPD1817–3)
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