[morzh]

Today was the soldering day.

I first soldered every TO-220 part on the heatsink.
Then I decided to inspect the board and while looking at large connectors (transformer to board, the outputs to the motherboard) and found a few pins looking like so: (look at the top pin).

   

How did that thing work.....beyond me.
So all the connectors, including the smaller ones, got some serious touch up.
Then upon inspection I noticed some small parts pins developed indentations around them some look like cracks started to develop.
I touched them up, some sputtered or cracled at me, I guess entrapped flux. Large hole were revealed, meaning the holes are much larger than the pins, and I am not sure the barrel is metallized, but if it is, the solder did not rise yp and remained a thin layer around the pin, which made it easy to crack. Well soldered barrel does not allow that to happen.

Then since the same large connector is on the motherboard, I also removed it (AGAIN!!!) And sure enough, saw the cracked solder, so I touched all pins up, and also did touch up the sole TO-220 part on it.

Then installed the power unit, and without connecting loads measured voltages.
All voltages are fine except one, +10V. I briefly investigated: the voltages are made with 8V 7808 LDO with the common connected to GND via 2.2V zener, which makes it output 10V. But the zener needs a bias, and it is provided with a 1.2k resistor. Of which one pin seems disconnected. So the Zener is not biased and the 8V LDO outputs 8V like a good boy he is.
I decided to wait until tomorrow: removal and installation of the power supply is an onerous thing.

Genug für heute.