Model 104 Super Deluxe
Doesn't power on, nothing happens.
First look on the inside.
I assume that the problem is in here.
I plugged in powersupply and measured voltages from this 5V regulator.
9V went in but 5V didn't come out so it seems that voltage regulator was broken.
I bridged the input and output of the regulator to bypass it temporarily and tested with 5V powersupply.
Still didn't work.
I unplugged powersupply and measured continuity and found that there was break in one solder.
Then I made a jump wire to fix continuity and now it works.
I bought new 5V regulator replace old faulty one and removed temporary bypass.