HP DesignJet 250C - Page 199

9Ć3 Product History and Service NotesC4699Ć90000
Firmware Revision Level
The plotter firmware is contained either on a flash ROM SIMM at the back of the plotter or
on a masked ROM inside the electronics module. The firmwareĆrevision level, for example
A.01.03, is printed by the plotter on the setup sheet and on the service configuration plot.
The revision level is also printed on a label on any flash ROM SIMM. Do not open the
electronics module.
: When replacing the electronics module, always remember to check the firmware
revision level of the  electronics module. The revision level will be printed
on the top surface of the module. Also, check the firmware revision level of the
ROM SIMM installed in the  electronics module. With this information you
must do the following:
1. If the firmware revision level of the ROM SIMM in the old electronics
module is  than the firmware revision level of the new electronics
module, then you   install the ROM SIMM into the module.
2. If the firmware revision level of the ROM SIMM in the old electronics
module is  than the firmware revision level of the new electronics
module, then you  install the ROM SIMM into the module.
Example 1: The ROM SIMM firmware revision level is A.01.03 and the
firmware revision level of the electronics module is A.01.04. You would use
the electronics module  the ROM SIMM installed.
Example 2: The ROM SIMM firmware revision level is A.01.05 and the
firmware revision level of the electronics module is A.01.04. You would use
the electronics module  the ROM SIMM installed.