sc623 on a mpc400sr..

[fshead]

greetings
I tried to add a 3rd tray on a 2 tray mpc400sr and got 623 error.
I removed the 3rd tray and machine now comes to ready.
Is there something in the wiring harness from adding a tray as 3rd tray that was originally a 2 tray?
I am thinking a jumper or wire in the harness moved differently
thanks

[LNorris]

What i am seeing is that you can add a single tray as tray 2. the tray 3 is a dual tray (3 and 4). only one single tray for tray 2.

[K-3]

it won't take 3 individual trays together, found this out on a c401sr. only two trays and a draw base unit with 2 trays.

[FrohnB]

From the SM: You can add a 2nd single tray (M367) to the machine (making two trays total), or you can add the "Tray 2/3" (M368) unit (making 3 trays total), OR you can Start with the Dual Tray (M368 - 2 drawer) and then put the single tray (M367) on top of that, and then put the machine with it's single tray on top of those (4 trays total).
You Cannot put Two single trays (M367) on top of each other. Just order the Two tray unit?

[fshead]

Thanks all
I thought I could Mcgyver something..........
The trays from mpc400 and mpc401 are all the same ?right?