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You are seeing the "PW Sensor Defect Error" because the printer is detecting a fault with the Paper Width Sensor.
The Paper Width Sensor is located on the print head carriage and detects the paper edge to prevent printing on the platen.
You can check the follwoing;
Ensure the print head cable is not damaged and makes good contact with the printer and print head carriage
Ensure the Paper Width Sensor is connected correctly to the print head carriage assembly
It may be necessary to replace the Paper Width Sensor
Enter the Menu system on the front panel, cycle around until you find calibration. Press the select button here and follow the instructions, when it asks for you remove ribbon remove it, it will ask to load the backing. Remove a label from the backing and let it do its thing, eventually it will ask you to load all. Re-install all the media and it will calibrate, after this it will fix your error. If it doesn't there will be a sensor that has failed.
The check ribbon message on the 2265 indicates the printer is detecting problems with moving the print head. You have ruled out the ribbon as being the cause of the problem by using ribbons from another printer.
Befor suspecting other components check the pritner model, if the printer is a 2265+ check to ensure the correct ribbon is used. Note the ribbon for the 2265+ is different to the 2265 ribbon. The 2265+ has a ribbon sensor to detect the ribbon moving. If the printer is a 2265+ the part number for the ribon should be 062471.
If the correct ribbon is used the problem could be the timming strip which could be dirty or warn. Try cleaning this and check for damage.
The problem can also be caused by a dirty or lubricated carriage shaft, the carriage shaft should be clean and dry running - Keep clean of any type of lubricant.
The problem can also be cused by the timing station on the carraige, the carriage motor.
Solid red light. This indicates the printer is in an error state and will not
print until the error is cleared. Check to make sure the printer is not out of
labels or out of ribbon if it is a TLP model.
A solid red light will occur if
the printer is out of labels
the printer is out of ribbon ( TLP models only )
the printhead is open, not latched down all the way. Press down on the top cover of the printer to see if the error light clears and goes to green.
the ribbon spool is slipping on the ribbon spool holder on TLP models:
I have a double oven GE Profile. The error message FO appeared. I shut off the circuit breaker for 30 minutes or more and the oven works but without warning FO reappears. FO message means there is short in the clear Off touch button. The only solution replace the complete panel. My cost delivered $328. Ouch!
It's very possible you are not installing the ribbon properly. When loading a new ribbon on a Monarch printer, you must save the plastic ribbon core (it's butter yellow in color) from the previous roll of ribbon. The core is what the ribbon is wound up on. Do not throw away this plastic core - you need it for the next roll of ribbon you load! You have to move this now empty core from the back ribbon spindle and slide it on the front ribbon spindle. You then load the new ribbon on the back spindle and attach the ribbon end to the empty plastic ribbon core on the front spindle. You CAN NOT just tape the ribbon to the front spindle. You must have an empty ribbon core to attach the new ribbon to. The printer will give a 754 error unless you have two plastic cores on the two spindles. It can also give a 754 error if the ribbon is not loaded properly, and also if you have a bad motherboard. There are no ribbon sensors, so that's never going to be a problem...