From: slavotinek@gmail.com   
      
   Yep, too many variables - the PSU itself, planar, op panel cable, op   
   panel assy.   
      
   So let's test the parts one by one, starting with the PSU:   
      
   Unplug the line cord, disconnect all disk drive Molex connectors, and   
   swing the PSU out (or remove it completely for better access). Then   
   short pins 1 and 2 on the PSU planar connector with a piece of wire and   
   plug the line cord back in. The PSU should start. If it does, verify all   
   DC voltages and the Power Good signal. If it doesn't power on, the PSU   
   is faulty.   
      
   Based on the described behavior, it may be just bad caps. Be careful if   
   you are gonna recap the PSU - the caps may hold a charge for quite some   
   time! There were quite a few different PSU models used in these   
   machines, and many of them are quite complex with multi-board   
   construction... this isn't a cheapo klone PSU.   
      
   On 06.01.2023 22:56, Louis Ohland wrote:   
   > I suggested shorting 1,2 on the PSU's connector to totally eliminate   
   > issues on the op-panel PCB.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)