
1Symptoms
I
Voltemeter
I
AVR
Brush
lI
Checking method
uRemedies
Voltmeter failure
Input AC voltage to terminals in the voltmeter side
If the displayed value is different from the input value, replace the voltmeter
AVR failure
Measure resistance value between the terminals with a circuit tester (Measure with a 4P coupter)
If the displayed value is different from the input voltage, replace the AVR
contact surface of
2.Abrasion of the
1.Confirm contact condition of the slip ring
2, Measure length of the brush
1.In case of conta- mination, clean the brush.
2.In case the brush is shorter than the standard one, replace it with
a regular one.
Clean or replace the brush.
1.Contamination of the brush’s contact surface
2.Abnormal abrasion of the slip ring
Confirm condition of the brush’s contact sur- face
1.If the brush’s contact surface is contami- nated, clean it.
2.In case of abnormal abrasion, replace it.
Cean or replace the slip rings
Breakage of welded section or lead line
Measure continuation with a circuit tester
111case of 00 52, the lead line is defective.