Mh 721 blade wont move up, it stays down.

[djcarysma 0]

I Have an mh 721

The blade holder wont move up or down, not even if I press the test cut or the origin button, I remove the carrige from the plotter and installed it on an other plotter that I have an mh 1351, and worked fine in that one, I cheked The cables That go from the carrige to The motherboard and they appear to be well soldered and complete, What do you suggest I do, I need this plotter because this one is the one I use for my shop office, the other one is on the location where I wrap Cars, any help will be appreciated.

Thank you.

[bigjimt 1]

Maybe the Mother Board

[Dakotagrafx 7,297]

There is a test (search for 9v) that uses a 9volt battery to test the carriage solenoid to help isolate the problem

[djcarysma 0]

I checked the voltage  in my working plotter that goes to the carriage to move the blade up or down with a multimeter, and it marks +3.5V to be up and -3.5V to be down, the machine that does not work, marks nothing, like no voltage is going to the carriage, that carriage

I tryed it in my working machine and it worked well, so I'm thinking may be is the motherboard, The plotter moves sideways and back and forward normally. any suggestions?

thank you.

[Dakotagrafx 7,297]

check cabling before going to the motherboard

[Guest HowardI]

If you have 2 machines and the motherboards are compatible, you can try swapping the motherboard.

This will help you determine the cause.

Howard Irwin

Support Specialist

US Cutter

425-481-3555

888-298-8143

 - Option 2