User Guide

Firmware DIMM (LJ 4200/4300 only)
NOTE The HP LaserJet 4250/4350 Series printers do not use firmware DIMMs. Instead a
firmware chip is soldered directly to the formatter in those printers. Firmware upgrades may be
performed via an RFU, see
Downloading a remote firmware update
CAUTION The product contains components that are sensitive to electrostatic discharge
(ESD). Always perform service work at an ESD-protected workstation.
1 Remove the formatter cover. See Formatter cover.
NOTE If possible, print a menu map and a configuration page. See Menu map and
Configuration page. Use the information on the these pages to restore any user-set printer
configuration options after you install the replacement DIMMs.
2 Open the formatter door.
3 Push the DIMM-locking arms away from the DIMM to release it, and then pull the DIMM out of
the DIMM slot.
Figure 6-36 Firmware DIMM
210 6 Removing and replacing parts