INSPECTION




ROTOR



1.Measure the resistance between the two slip rings of the rotor coil to check the continuity between them.
Replace the rotor if the resistance is not within the standard value range.
Standard value: 2 - 4 Ω

2.Check the continuity between the slip rings and core.
If continuity is present, replace the rotor.

STATOR



1.Check the continuity between coil leads.
If there is no continuity, replace the stator.

2.Check the continuity between coil and core.
If there is no continuity, replace the stator.

RECTIFIER ASSEMBLY



1.Check the condition of the (+) heat sink by checking continuity between the (+) heat sink and each of the stator coil lead connecting terminals.
If continuity is present for both terminals, the diode is shorted. Replace the rectifier assembly.

2.Check the condition of the (-) heat sink by checking continuity between the (-) heat sink and each of the stator coil lead connecting terminals.
If continuity is present in both directions, the diode is shorted. Replace the rectifier assembly.

3.Check the condition of the diode trio by testing continuity of each of the three diodes using a circuit tester connected to both sides of the diode. Connect in a polarity and then reverse the polarity for each test.
If continuity exists or no continuity exists for both polarities, the diode is defective. Replace the rectifier assembly if any of the diodes is defective.

BRUSH



1.Measure the length of the protrusion of the brush. Replace the brush if the protrusion length is shorter than the limit.
Limit: 2 mm minimum
2.Unsolder the lead of the brush. The brush will come out, becoming ready for removal.

3.Install a new brush by pushing it into the holder as shown in the drawing and soldering the lead.