HP CE544-60001 formatter board is a replacement part for the HP LaserJet M1536 printer series. The service parts list identifies this exact part number as the printer’s formatter assembly.
The formatter is listed separately from the fax boards and formatter cable, so this part is the formatter board assembly itself. A distributor listing also identifies CE544-60001 as an HP Formatter PC Board Assembly and names the HP LaserJet Pro M1536dnf Multifunction Printer as compatible.