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
Q6651-60349PC Board - Printmech PC board - Controls the funtion of the print mechanism
Q6652-60121PC Board - Sausalito PCI PC board - For 60-inch plotters (this 60-inch model can be used in a 42-inch printer but a 42-inch model CANNOT be used in a 60-inch printer)