SuperTester ICE 680R - Reparación fallida

This tester was sent to me by a subscriber. He knew it was faulty and was planning to throw it away. But he felt sorry for it and decided to send it to me to see if it could be repaired, and if not, at least salvaged for parts. It's in very bad condition. In the end, the galvanometer was the problem, and even if it were in good working order, repairing it would be uneconomical. It's a gem of electronic instrumentation: the Supertester ICE 680R analog multimeter, manufactured between 1969 and 1976. In its day, it was the best multimeter available, versatile and easy to repair. Many electronics technicians learned with it, and naturally, we later incorporated it into our work. Today, technology hasn't spared it, and it has been surpassed by others. But even so, it's completely reliable despite being in service for over 40 years. It measures AC voltage. and in DC, AC and DC intensity, DC and AC resistance, frequency, decibels and capacitance...