1. Disconnect the board from the rails
2. Unsolder E, +15v terminals (should I disconnect -15v too?)
3. Perform a simple continuity test between disconnected +15 and E terminals on the board (is that enough?)
From the information Martin gave me a simple continuity check is not enough. So I should:
4. Hook up the +15V (-15V also?) terminal to the external PSU (can it be something simple or should I get a variable bench psu?)
5. What should be measured now?
PS. I have tried to perform a simple continuity check on some boards and I get some readings - A tiny short beep and something like 1452 reading. Is that within the tolerance or is the board bad?
Lots of questions - sorry guys but it has been a long night.