HP 4550 Service Manual - Page 171

Note Note Formatter PCB To remove the formatter PCB from the cradle Turn the printer off, wait five seconds, and then unplug the printer. Before replacing the formatter or firmware, make sure to record the printer's serial number, fuser maintenance count, transfer maintenance count, color page count, and total page count. 1 Remove the formatter from the printer by removing the six screws. 2 Remove the EIO cards (if any) from the EIO slots. 3 Disconnect the L-shaped (I/O) card from the formatter by lifting up on the narrow end of the PCB. 4 While lifting the two black plastic tabs located over the EIO connectors on the formatter PCB, slide the formatter PCB out of the cradle. Lift the narrow end of the L-shaped (I/O) card so the connectors have clearance. 5 Install the new formatter PCB by sliding it into the cradle. 6 Reconnect the L-shaped (I/O) card to the formatter PCB. 7 Pull all DIMMs from the old formatter PCB and install them on the new formatter PCB, making sure the firmware DIMM is installed in the ROM ONLY DIMM slot of the HP Color LaserJet 4500 printer, or Slot #3 (J7) of the HP Color LaserJet 4550 printer. 8 Install the EIO cards (if any). 9 Install the formatter back into the printer. 10 Power up the printer in NVRAM initialization mode as follows: Step 1 Hold down both the [CANCEL JOB] and [SELECT] keys until all the LED lights are on, then release the keys. Step 2 Press [CANCEL JOB]. Step 3 Press [SELECT]. 11 Once initialization is complete, turn off the printer, then turn it back on in service mode (see "Service mode" on page 293 for more information). 12 Enter the printer's serial number, fuser maintenance count, transfer maintenance count, color page count, and total page count. 13 Print a configuration page to verify printer operation. C7085-90921 Chapter 6 Removal and replacement 169