ELECTRICAL 21 ELECTRICAL 2.1.2 Testing of Negative power diode: With red probe of the multi-meter on the lower hear sink into which the negative power diodes are pressed i.e. D- and black probe on the M1 ,M2 ,M3 the multi-meter reading should be with in 0.300V and 0.900V. Interchanging the probe (black on D).No current should flow. Even if one diode found defective in the above tests, the rectifier assembly has to be replaced. 2.2 TESTING OF STATOR. Using Multimeter, check the resistance between the phases of the stator winding. The resistance should be 0.040 ± 10% ohms per phase. 2.3 TESTING OF ROTOR: Measure the resistance of the rotor winding at the slip ring with multimeter. Resistance should be 2.1 ± 10% Ohms at 20 deg c or 3 ± 10% ohms at room temperature. 3.0 ASSEMBLY 3.1 Bearing Pressing in DEF: If the bearing in the drive end shield (DEF) has been discarded. Press in a new bearing using an Arbor press. Assemble the bearing holding cover plate on the drive end flange using four counter
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