Paper Feed Unit PB1080TE is the optional PFU which can be locked with a key.
The key cylinder [A] is mounted on the front cover of the tray for preventing theft of paper. When the tray is locked with a key, it cannot be pulled out. Even if the machine body is unloaded from the PFU, taking out paper is impossible, because the plate [B] is fixed on top of the PFU.
In addition, in this model, the ribs [C] are added to the vertical transport unit. The ribs prevent from inserting fingers into the tray and rotating the feed roller with hands.
Two keys are shipped including the spare. In either position Lock/Unlock, it is possible to pull out the key. The key will be horizontal in the lock position.
If the key has been lost, arrange new keys registered as service parts (P/N: D1462868, this P/N is as of October, 2016).