Fixing Dragon 32 Power supply

This morning the Dragon 32 power supply broke. I have a Dragon 32 that I bought one time ago. But when I tried to turn it on, it didn’t work. I checked the power circuit inside of the Dragon 32 and found that the regulator was broken.

It was a LM340T 7812, 12v regulator, so I replaced it with a new one. But when I tried to turn it on, it didn’t work.

And LM7905CT 5v regulator was broken too. So I replaced it with a new one. But when I tried to turn it on, it didn’t work.

Then I checked the power supply and found that it has two fuses (inside of yellow pipes)

The power supply schematic is:

Power supply connector is a db9 female connector

After replace the fuses, the Dragon 32 worked fine. I was happy to have a working power supply for my Dragon 32.