Generator Rotor Inspection A-Type : Mando

Inspect the Rotor Assembly

1. Test the rotor for an open circuit by using the ohmmeter. Replace the rotor if necessary.
2. Test the rotor for open or short circuit (1).

Specification
The measured resistance is 2.9 ohms.

3. Replace the rotor if necessary.
4. Test the rotor for open or ground circuit by using the ohmmeter (2). Replace the rotor if necessary.

Inspect the Stator

1. Test the stator for an open circuit by using the ohmmeter (1). Replace the stator if necessary.



2. Test the stator for open or ground circuit by using the ohmmeter (1). Replace the starter if necessary.

Inspect the Rectifier

1. Positive rectifier test: Inspect the open circuit for stator coil lead terminals using the ohmmeter (1). Replace the rectifier if necessary.



2. Negative rectifier test: Inspect the open circuit for stator coil lead terminals using the ohmmeter (1). Replace the rectifier if necessary.

Inspect Trio Diodes

1. Inspect the open circuit for trio diodes using the ohmmeter (2).
2. Replace the heat sink if necessary (1).

1. Inspect the brush wear.
2. If the brush wear exceeds the specified valve (a), replace the brush.

Specifications

•	Brushes Wear Standard is 18.5 mm (0.73 in).

•	Brushes Wear Limit is 13.5 mm (0.53 in).

Generator Rotor Inspection B-Type : DAC

Rotor Assembly Inspect

1. Test the rotor coil for an open circuit by using the ohmmeter. The reading should be sufficiently low, or the rotor must be replaced (1).



2. Test the rotor for open or short circuits. The reading should be 2.6-2.8 ohms, or the rotor should be replaced (1).
3. Test the rotor for open or ground circuits by using the ohmmeter. The reading should be sufficiently high, or the rotor must be replaced (2).
4. Inspect the fan blade for damage.

Stator Inspect

1. Test the rotor for an open circuit by using the ohmmeter. The reading should be sufficiently low, or the stator must be replaced (1).



2. Test the stator for open or ground circuits by using the ohmmeter. The reading should be sufficiently high, or the stator must be replaced (1).

Rectifier Inspect

1. Positive rectifier test: Inspect the open circuit for stator coil lead terminals using the ohmmeter (1). Replace the rectifier if necessary.



2. Negative rectifier test: Inspect the open circuit for stator coil lead terminals using the ohmmeter (1). Replace the rectifier if necessary.

Trio Diodes Inspect

1. Inspect the open circuit for trio diodes using the ohmmeter (2).
2. Replace the heat sink if necessary (1).

Brush Wear Inspect

1. Inspect the brush wear.
2. If the brush wear (a) exceeds the specified value, replace the brush.

Specification

•	Brushes Wear Standard is 20 mm (0.79 in).

•	Brushes Wear Limit is 14 mm (0.55 in).