Processor Board Voltage Settings / Adjusting the Power Supply

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Processor Board Voltage Settings / Adjusting the Power Supply
The voltage running to the processor is important to keep the processor board running properly. Set the voltage too high and strange things start to happen. Set the voltage too low and we have possible resetting issues.
ome power supplies have an adjustable voltage output. Milnor uses a potentiometer (POT) to set the voltage output. Voltage is adjusted  by turning the screw. Typically turning the screw in clockwise (CW) direction will raise the voltage, while turning the screw counter clockwise (CCW) will lower the voltage.

Some power supplies source 5, 12, and -12 VDC.  If the processor uses 5 VDC then this voltage is most important to regulate using the POT on the board.  The POT adjusts 5VDC and may also affect other voltages.  

Processor boards must have stable 5 VDC to operate properly.  If voltage fluctuates approx .25 volts high or low, then the processor will reset.  We typically set the 5 volt supply at 5.10 volts DC.  

You will need a meter with 2 digits of resolution to set the supply voltage properly.  

Never measure the voltage at the power supply!  Always check the voltage at the processor board power connector and adjust the supply as needed to get 5.10 volts at the processor connector.  Voltages at other boards may vary and of course the voltage at the power supply will be higher than at the processor board.  

Example of a typical POT on a power supply (your power supply and POT may look different)
Power Supply Adjustment POT


The DC and AC power supply connections are pictured below.
Attached to board in picture above 10YPWRAC at left, 10YPWRDC at right 

User-added image User-added image

How do I set voltages on a 168 processor?




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