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Removal and Installation
8-13
HP DesignJet 430, 450C and 455CA Printers
Removing the Electronics Module
Refer to figure 3 ' page 14.
Important Information
The Printer firmware is contained either on a flash ROM SIMM at the back
of the Printer or on a masked ROM inside the electronics module. The
firmwareĆrevision level, for example A.01.03, is printed by the Printer 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.
Important: When replacing the electronics module, always remember to
check the firmware revision level of the new 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 old 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 lower than the firmware revision level of
the new electronics module, then you must not install the
ROM SIMM into the module.
2. If the firmware revision level of the ROM SIMM in the old
electronics module is higher than the firmware revision level
of the new electronics module, then you must 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 without 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 with the ROM
SIMM installed.
Removal
The electronics module is a fieldĆreplaceable part. You do not need to
open it. If it is faulty, exchange it for a new one.
1. Remove the right endĆcover ' page 8Ć11.
2. Disconnect the frontĆpanel assembly from the main PCA.
3. Unscrew the cover plate at the back of the Printer, and remove it.
4. Remove one screw (item 1) and washer (item 2) from the back cover.