Troubleshooting the Century 880-113-666 Welder Control PCBoard
They put the 880-113-666 control board in many different welding machines and they private labeled machines for many different company’s including but not limited to Century, Snap-On, Solar, Dayton, Marquette, All Star, Mac and Matco.
Assuming everything but the board is good. There are 5 main issues that could be caused by a bad board in these machines.
- Machine does nothing when gun trigger is pressed
- Wire Drive motor feeds but no weld output
- Wire Drive motor feeds but max weld output.
- Wire Drive motor Max speed has weld output
- Wire Drive motor will not run has weld output.
- Spot Board Issue
Warning: Only have qualified personnel check live voltage inside a machine with proper PPE and training.
1. Machine does nothing when gun trigger is pressed
1-a. Check for 24-30 Volts AC depending on input voltage (J3 & J4) (see above image)
If there is no input voltage into the pc board. The board it not the issue.
1-b. Check for 15 Volts DC when gun trigger is NOT pressed and 0 VDC when gun trigger is pressed (J5 pin 1 & 2) (see image above)
If you do not have 15 VDC you may have a power supply issue on the board (the board needs to be replaced).
If the 15 VDC is not changing when pressing the gun trigger you may have an issue with the gun trigger circuit.
2. Wire Drive motor feeds but no weld output
2-a. Check for 3-10 VDC to Triac Relay (J5 Pin 3 & 4) with gun trigger pressed (see image above)
If you do not have any voltage going to the triac relay, the machine will have no output.
If you do have voltage some machines have a Normally Closed (NC) thermostat on these wires that could be open or the triac relay could be bad (the SSR or thermostat needs to be replaced).
2-b. Check 5k Ohm Heat Potentiometer on front control panel. (see Testing Potentiometers)
3. Wire Drive motor feeds but max weld output
3-a. Output is stuck on or output at MAX
Check above 2-a.
Unplug plug J5 if output still on you have a bad Triac Relay (The SSR needs to be replaced).
4. Wire Drive motor Max speed has weld output
4-a. Check 5k Ohm Wire Speed Potentiometer on front control panel. (see Testing Potentiometers)
If wire speed Pot is good and motor is at max speed then issue is on control board (the board needs to be replaced).
5. Wire Drive motor will not run has weld output
Many people think, "when you pull the gun trigger and the wire drive motor does not run that the problem is the motor is bad. To check the motor apply 12-24 vdc to the motor wires (disconnected from the board) and see if runs. If the motor runs the problem is not the motor.
5-a. Check 5k Ohm Wire Speed Potentiometer on front control panel. (see Testing Potentiometers)
If you have checked the motor and the POT the board may be the issue.
6. Spot Board Issue
If your machine has a spot/timer board that plugs into J6 you can unplug it to test the machine, it will work without it. If the timer chip shorts on this board it will cause to main control board not to work correctly. If the spot/timer board is bad we can fix it please contact us to find out how.
This does not cover all the issues with this control board but these are the most common.