HP 3150 EN - Manual (Page 20)

18 Product Information EN
Model and serial numbers
The model number and serial number are listed on an identification
label located on the back of the printer.
The serial number contains information about the Country of Origin,
the Revision Level, the Production Code, and production number of
the HP LaserJet 3100/3150 product.
The label also contains power rating and regulatory information. The
label shown in Figure 1 below is a label from an HP LaserJet 3100
product.
Figure 1. Model and serial number label
z HP LaserJet 3100 product Model number C3948A
z HP LaserJet 3150 product Model number C4256A