Paul:
Where are you located? I have a set of empty MIS carts that I was going to use in my 1430 unitl I found out the early 1400 carts won't work in a 1430.They are drained and dry and I don't mind paying the small flat-rate shipping charge to send them to you in the USA. You could at least put them in your 1400 and see if it recognizes them.
Homer Shannon