Question about Miller 903777012 SPECTRUM 2050 PLASMA CUTTER

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Miller 2050 plasma press lite alert. When I turn on machine I get pwr and ready lite. 2 1/2 seconds later, ready lite goes out and press lite comes on. I have proper air press thru regulator to solenoid valve. The press switch ohms closed above 40psi. I have two machines so I swapped 4 PC boards (2 on each side) as well as torch/hose assembly and still have same symptoms. Any suggestions?

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johnr1959
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SOURCE: miller 3080 plasma ,won't fire

check groun dconnection on workpiece and where connected to machine>> check reset switch.>
There is a screw in fuse on the back make shure you unplug the machine befor removing any fuse or working on any electrical problem.>>OUCH!

Posted on Jan 29, 2009

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  • 24 Answers

SOURCE: Miller 2050 that will not spark.

This is relative to 3 causes , contol board , pwm board or torch

Posted on Sep 18, 2009

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1 Answer

How to reset 3421 all ready try to off power and pwr on hold utilty then truble reset ok again pwr on but still same problem


IF THIS PROCEDURE DOES NOT WORK AND CODE COMES BACK DO NOT CONTINUE TO RESET THIS CODE IT DEALS WITH THE FUSER THE HOT PART IT CAN CATCH FIRE AND THAT WOULD RUIN A PERFECTLY GOOD DAY.
1. Turn OFF the main power switch.
2. Turn main power switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, turn it on again more than 10 seconds after and check machine operates properly.

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1 Answer

It runs when u press the trigger theres no fire or air comes out


Is the compressed air pressure in the limits for the unit to work. try turning the pressure up.

Aug 01, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Spectrum 2050 plasma cutter . Cutter blows air and stops when trigger is pulled no pilot arc or any cutting when trig is released air flows again and stop after 10 sec new tips was working the day...


Check compressed air pressure is in limits otherwise unit will cut out. Try adjusting the pressure up. also make sure the supply pressure is correct as it may not be your plasma cutter at fault.

Jul 30, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

It runs but when you press tha trigger theres no


go to miller.com they have downloads for most everything they make. it sounds like you might have a ground problem or a bad connection in the tip

Jan 24, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Power light blinking fast and voltage is fluctuating on load side of system and no power to handle


The machines that I have seen do that need the main circuit control card assembly. It is not a cheap circuit board either.

Jul 15, 2009 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Miller 2050 that will not spark.


This is relative to 3 causes , contol board , pwm board or torch

Feb 28, 2009 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Miller 3080 plasma ,won't fire


check groun dconnection on workpiece and where connected to machine>> check reset switch.>
There is a screw in fuse on the back make shure you unplug the machine befor removing any fuse or working on any electrical problem.>>OUCH!

Jan 14, 2009 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Green lite comes on for about 2 to 3 seconds then shuts down red lite pulses


If the back was off the board on the left is your Ysus board. It will have a cable plugged into the right side of the board from the signal board. Unplug the the Ysus board. If it stays on without a picture change both Y and Z sustain boards. If this helps let me know.

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