F186000 is DX5 solvent head, can work on Mutoh VJ1204 after change or modify the head adaptor.
It is for the old version.
Months ago, Epson change the DX5 head include F186000.
So, new version F186000 head can not use on Mutoh printers now.
Users have to buy original Mutoh head or the old version DX5 head in a high price.
Adam Yang from Inkmed