Mec 3072ES - Continuity Checks

October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 2-14
Continuity Checks
Check Key Switch – ON-OFF
• Disconnect wires.
• Connect first probe of ohm meter to
common terminal.
• Connect second probe to any normally open terminal.
• With switch OFF (open) there should be no reading.
• With the switch ON (closed) there should be a low reading.
• Repeat for each normally open terminal.
Check Toggle Switch – 1-Pole 2-Position
• Disconnect wires.
• Connect first probe of ohm meter to common terminal.
• Connect second probe to top normally open terminal.
• With toggle DOWN there should be no reading.
• With the toggle UP there should be a low resistance.
• Move second probe to bottom normally open terminal.
• With toggle UP there should be no reading.
• With the toggle DOWN there should be a low resistance.
Check Toggle Switch – 1-Pole 3-Position
• Disconnect wires.
• Connect first probe of ohm meter to common terminal.
• Connect second probe of ohm meter to top terminal.
• With the toggle UP or MIDDLE there should be a low resistance.
• Move second probe to bottom terminal.
• With the toggle DOWN or MIDDLE there should be a low resistance.
• Connect first probe of ohm meter to top terminal.
• Connect second probe of ohm meter to bottom terminal.
• With toggle in ANY POSITION there should be no reading.
Check Toggle Switch – ON-OFF
• Disconnect wires.
• Connect first probe of ohm meter to
common terminal.
• Connect second probe to normally open terminal.
• With the switch turned OFF there should be no reading.
• With the switch turned ON there should be a low resistance.
CommonNormally
Open
ART_2561
Common
Normally Open
Not Used
Common
Normally Open
Not Used
ART_2562
Common
Normally Open
Normally Open
Common
Normally Open
Normally Open
ART_2563
Common
Normally Open
Normally Open
Common
Normally Open
Normally Open
ART_2563