HP 750c Service Manual - Page 201

Identifying a Printed Circuit Assembly The plotters have the following major identification features: Part Number PCAs having the same part number are directly interchangeable. If a PCA is revised in any way that makes it nonĆinterchangeable with previously issued PCAs of a particular part number, a new part number is assigned to the revised PCA. Revision Letter This letter identifies the most recent revision to the etched circuit pattern. The original issue is identified with the letter A. If the master artwork for a printed circuit board is revised in order to alter performance or manufacture, the revision letter is changed to the next letter in the alphabet. Firmware Revision Level To find out which firmware revision the plotter is using: 1 At the Status / Ready" message press the Enter button. 2 Use the Arrow buttons to scroll to the Utilities" menu display and press the Enter button. 3 Use the Arrow buttons to scroll to the Statistics" menu display and press the Enter button. 4 Use the Arrow buttons to scroll to the Code rev =" C4705-90000 Product History and Service Notes 10-3