Contents: Replacement of cover and gasket ↓ Soldering broken electrical…↓ Cleaning contacts ↓ Cleaning the voltage regulator ↓
Voltage regulator repair should only be carried out in exceptional cases; it is recommended to replace it. The following operations are allowed for repairing the regulator.
Replacement of cover and gasket
When installing a new cover, make sure that the cover and gasket are completely clean and that the gasket is installed correctly. After installation, tighten the screws until they stop.
If there is dirt inside the regulator body, clean the contacts and other parts of the regulator.
Soldering broken electrical connections
Solder using neutral flux, in small quantities, protecting the insulation from overheating. Remove excess flux after soldering, as its residue, evaporating from the heat emitted by the regulator during operation, can contaminate the contacts.
Cleaning contacts
1. To clean the contacts, remove the armature spring and, after loosening nut 4 (see Fig. Voltage regulator PP-380), lift the stand 6 of the fixed contact of the 1st stage.
2. Using a flat velvet file, carefully clean the contacts, removing burnt materials and oxides from the entire surface. The file must be completely dry, washed in pure alcohol or gasoline. The depressions that have appeared on the contacts due to burning must be cleaned with a clean steel pointed pin.
3. Remove silver filings from the regulator body by blowing it with dry, clean air.
4. Install the anchor spring in place. By moving the stand 6, adjust the gap (1.4±0.07) mm between the anchor and the core, ensuring that the contacts touch correctly.
5. By moving rack 5, adjust the distance between the contacts of the 2nd stage to (0.45±0.1) mm, ensuring that the contacts touch correctly.
6. Tighten nut 4.
7. Replace the gasket and cover, then test the regulator on the bench and adjust if necessary.
Cleaning the voltage regulator
If foreign substances enter the regulator, after cleaning the contacts, before checking and adjusting, carefully wash the regulator with alcohol or clean gasoline and then dry it (without lid) in the oven at 120°C for two hours. Then check the regulator on the stand and adjust if necessary.