Elektronika MK-52: The MK-61 big brother?

[Francois Lanciault]

I was hoping this could be my problem too... But after removing the four capacitors, they all test good. I will put everything together and check the voltage.

François

(10-28-2014 01:21 PM)jebem Wrote:  DC-DC converter power supply troubleshooting:

As I had a couple of hours to kill before my tonight flight to Cuiabá (Brazil) for another work week, I have removed the four electrolytic capacitors to test.

As I suspected, two of them are dried and have lost the capacitance (see measurements in the pictures below).

Two capacitors are from one Russian brand, and the other two are from another Russian brand.
Interestingly, the failed capacitors are from the same brand, despite having being manufactured after the other two:

- Two 5uF / 50V, Ref. K50-6, made in 0384 (March-1984), are OK.
- One 20uF / 25V, Ref. K50-16, made in 8509 (1985-Sept), is dead.
- One 2uF / 25V, Ref. K50-16, made in 8603 (1986-March), is dead.