From: jrr@flippers.com   
      
   On 2024/05/21 8:07 p.m., Othello wrote:   
   > Novice taking a stab at troubleshooting. Stern Meteor displays are out.   
   > The playfield lamps are fine, the MPU boots, and games do play fine with   
   > no errors. Just no display.   
   >   
   > TP2 voltage on SDU-100 shows 85.6-87.9 Volts where there should be 185V   
   > according to schematic. RT1 does not change measured voltage. Replaced   
   > C23 and C26 capacitors with no improvement. TP4 shows 250V. VR1 shows   
   > 65V where schematics says it should be 140V. So all the voltages are   
   > different from schematics.   
      
   Is the voltage being measured with or without any load. My suspect is   
   that the pass transistor is open - check what the voltages are on the   
   driver transistor for the pass regulator   
      
   >   
   > Any thoughts where the fault could be? Easier to just punt and swap in   
   > an Alltek board?   
      
   Easier? Yes, certainly easier, and the Alltek boards are very reliable -   
   I've been selling them for a couple of decades now.   
      
   https://flippers.com/catalog_oc/bally-stern-alltek-ultimate-sole   
   oid-driver-board-ultimate-sol-drv   
      
   However I find it more fun to fix the board - if you like troubleshooting!   
      
   John :-#)#   
      
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