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signdork

MH721 hed wont lift on power up

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Unit is ground and works normaly, except suddenly now it wont lift the cutting head at all so it cuts the art but also just drags the blade at all times.  Any tests that can be done with out just throwing a bunch of parts at it.  I have a older unit as well that had a new board put in in 2006 under warranty, and this machine was bought as its back up in 2007 and has now failed.

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i don't have this machine, but there should be a spring that pulls the cutter up.

bb

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I used this test from howard to determine whether its the carriage or the motherboard:

1: pull off carriage cover

2: there will be either two soldered wires or two copper plates

3: using a nine volt battery, touch the plates (the battery will fit perfectly to touch a contact to each plate

4: if nothing happens, flip the battery and try again

if the blade jumps, the carriage is fine and you need a motherboard.  If the blade doesn't respond to the battery, you need a carriage

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