Removing
1. Ring wrench by 8 mm unscrew the three bolts connecting the terminals of the stator windings to the rectifier unit (1) and another bolt securing the rectifier block (2) (pay attention to how the insulating and thrust washers are installed).
2. Using a Phillips screwdriver, unscrew the screw securing the capacitor.
3. Carefully bend the wire of the stator winding leads to the side.
4. Remove the rectifier unit along with the capacitor.
5. Ring wrench by 10 mm unscrew the nut securing the contact bolt.
6. Remove the spring washer, spacer, insulating washer and condenser wire lug from the bolt.
Examination
Note: A good semiconductor diode conducts electricity in only one direction. If the diode does not conduct current or conducts current in both directions, then it is faulty.
1. To check additional diodes, we connect the probe of the positive output of the ohmmeter (in diode test mode) to the common bus of additional diodes (1), and the negative terminal probe - to the output of the tested diode (2). A good diode should not pass current (resistance tends to infinity).
2. We change the probes of the tester in places. If the diode is good, the ohmmeter should show resistance (several hundred ohms). Similarly, we check the other two additional diodes.
3. We connect the probe of the negative output of the ohmmeter to the plate of the rectifier unit, into which the diode under test is pressed, and the probe of the positive output to the diode output. A good diode should not pass current (resistance tends to infinity).
4. We change the probes of the tester in places. If the diode is good, the ohmmeter should show a resistance of several hundred ohms.
5. Similarly, we check other diodes of the rectifier unit.
Note: The capacitance of a capacitor can only be measured with a special device. You can verify the failure of the capacitor using an ohmmeter with a measurement limit of at least 1000 kOhm.
6. We connect an ohmmeter to the terminals of the capacitor and observe its readings. If the capacitor "not broken", then when the device leads are connected to it, the ohmmeter at the first moment will show a small resistance, then this resistance will increase rapidly until it stabilizes. A similar change in the readings of the ohmmeter should be repeated when the polarity of the device is changed.
Faulty rectifier unit and capacitor are replaced.
Installation
We install the rectifier unit and the capacitor in the reverse order of removal.