Contents: Replacement of cover and gasket ↓ Soldering broken electrical…↓ Cleaning contacts ↓ Cleaning the voltage regulator ↓
The voltage regulator should be repaired only in exceptional cases; it is recommended to replace it. The following operations are allowed for the regulator repair.
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 seated correctly. After installation, tighten the screws until they stop. If dirt appears inside the regulator housing, clean the contacts and other parts of the regulator.
Soldering broken electrical connections
Solder using a small amount of neutral flux, 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
To clean the contacts, remove the anchor spring and, after loosening nut 6 (fig. 7-10), lift the stand 8 of the fixed contact of the 1st stage.
Using a flat velvet file, carefully clean the contacts, removing burnt materials and oxides over the entire surface. The file must be completely dry, washed in pure alcohol, gasoline or, better, trichloroethylene. The depressions that have appeared on the contacts due to burning must be cleaned with a clean steel pointed pin. Remove silver filings from the regulator body by blowing it with dry and clean air. Install the anchor spring in place.
By moving the clamp of the fixed contact of the 1st stage, adjust the gap between the anchor and the core to 1.4±0.07 mm, ensuring that the contacts touch correctly. By moving the clamp of the fixed contact of the 2nd stage, adjust the distance between the contacts of the 2nd stage to 0.45±0.1 mm, ensuring that the contacts touch correctly. Tighten nut 6.
Replace the gasket and cover, then test the regulator on the bench and adjust if necessary.
Cleaning the voltage regulator
If foreign substances penetrate into the regulator, after cleaning the contacts, before checking and adjusting, carefully wash the regulator with alcohol or clean gasoline (solvent), 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.