6fdc891e   
   From: 83d72b796d91c68f5fa0209d60bf1173@example.com   
      
   Looks like these threads are years old so this will probably never be read! I   
   designed the receiver. There is no service manual, unless one was done after I   
   left the company. The receiver was calibrated automatically by computer over   
   the rs 232 port    
   before the units were shipped. The calibration points were stored in eprom.   
   Depending on the year of manufacture there was a backup battery or 1 farad cap   
   as backup. As the original spec was 10 years receiver life most receivers have   
   now probably died.    
   The cal software ran on a BBC micro. Any programming info is long gone.   
      
   --   
   For full context, visit https://www.electrondepot.com/repair/cha   
   e-gpr4403-laboratory-receiver-service-manual-please-29513-.htm   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)