CH955-67009PC Board - Interconnect PCA - Controls several motors and is also used as a connections board for some of the functionality that resides in the printmech board.
CH955-67010PC Board - Omas pca serv for HP DesignJet L25500 Series - Optical Media Advance Sensor (OMAS) PCA - Designjet L25500 printer series
CH955-67021PC Board - Engine PCA-Sausalito- 42 and 6, Sausalito PCI PCA - Main controller of the printer, it is responsible for all the processes performed in real-time and are the ultimate controllers of all electromechanical systems
CH955-67030PC Board - Printmech PCA - Controls motors and fans
CH955-67054PC Board - Ink Service Station (ISS) PCA - For Designjet plotters
Q6651-60151PC Board - Carriage PC board - For the DesignJet Z6100/L25500/L26500 Carriage PCA
Q6651-60209PC Board - PC Board for Designjet L25500 Series HP Designjet L25500 printer series DesignJet Z6100
Q6651-60282PC Board - PC Board for Designjet L25500 Series, HP Designjet L25500 printer series, DesignJet Z6100
Q6651-60338PC Board - Carriage Printed Circuit Assembly (PCA) board designed for HP DesignJet and Latex large-format printers like Z6100 L25500 L26500 and Latex 210/260 series printers
Designjet L25500 60-in Printer large format printer parts list