J3111-69001PC Board - JetDirect 600N EIO internal print server 10Base-T, 10BASE-2, and LocalTalk LAN interface board - Has one RJ-45, BNC, and 8-pin DIN connector
J4167-69001PC Board - JetDirect 600N EIO internal print server token ring LAN interface board - Has one RJ-45 and DB-9 connector
RG5-2125-000CNPC Board - Feed sensor/paper size board - Small PC board with four paper size micro-switches and the paper feed photo sensor - Mounts in the front left of the 250-sheet paper feeder assembly
RG5-4212-000CNPC Board - Sensor PCA - Tray size sensor PCA - Has four micro switchs acuated by the tray size sensor leaf spring
RG5-4212-020CNPC Board - Sensor PCA - Tray size sensor PCA - Has four micro switchs acuated by the tray size sensor leaf spring