Old bench power supply restoration (AUL210 from 1983) part 3

Another episode of the repair journey of this vintage linear bench power supply (AUL210 made by ZPA Košíře závod Děčín in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs with thyristor (SCR) pre-regulation, two 15V 1A outputs and one 5V 2A output. Replacing the mains cable and some paper capacitors, testing the ESR of electrolytic capacitors. Trying to find the problem in the 15V section. How to test resistors, diodes, potentiometers, capacitors and transistors using a multimeter.

The 1st episode:
https://youtu.be/fRdSxuZ80sY

The 4th episode:
https://youtu.be/bWxS2njU-JI

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Видео Old bench power supply restoration (AUL210 from 1983) part 3 канала DiodeGoneWild