AEMC 4500 - Warranty and Repair Information

Digital Ground Resistance Tester Model 4500 41
WARNING
• Ifthesupplyswitchissetto110VACandtheinstrumentisconnected
to220VAC,thebatterychargeindicator(seeFigure3)willturnon
for several seconds, but will then turn off. The fuse will blow. Do not
continue to run the instrument.
• Ifthesupplyswitchissetto220VACpositionandtheinstrumentis
connectedto110VAC,theindicatorwillnotturnon.Theinstrument
will not recharge or operate.
NOTE: For either situation, errors in completing connections will not
endanger the instrument.
5.2.7 Replacing the Supply Fuse
An internal fuse is used to protect the instrument against an improperly
selected supply voltage.
To replace this fuse:
• Removethesixhexscrewsfromthebottomofthecase(seeFigure
22),andliftthechassisfromthecasehousing.
• Replacethefuse(Figure24)andreassembletheinstrument.
5.2.8 Replacing the Safety Fuse
Aninternalfusewhichprovidesprotectionforupto500VACisusedto
protect the instrument against voltages into the test leads.
To replace this fuse:
• Removethesixhexscrewsfromthebottomofthecase(seeFigure
22),andliftthechassisfromthecasehousing.
• Turnthechassisover.
• Replacethefuse(Figure25)andreassembletheinstrument.