The checks are, in both cases, wallet style, slightly less than 3" high. This leaves a 2½" stub at the bottom. Naturally, I rarely print checks in multiples of 3, so I usually have a short sheet to start each run. Sometimes a short sheet has two checks, sometimes only one.
I have never had a problem when there are two checks, but sometimes when there is only one, the printer "drops" the sheet between the OPC and the fuser unit. This happens with both printers, but not all the time. The sheet is 5½" high, and the documentation for both printers specifies a minimum sheet length of 5". I have never had a problem printing 3x5 cards, so why the problem with the 5½" sheets? Is there a PCL command that tells the printer there is a short sheet coming? I cannot find such a command in my reference manuals, which are quite old [almost two decades].