Pro 7900 and 9900 Field Repair Guide 10/6/10
Board (Sub B) Removal Printer Component, Software Item, LCD Display, Printer Button Page 35.
Board (Sub B) Removal
1. Turn off the Printer and UNPLUG from AC.
2. Remove the Cover (Right Side).
3. Unplug the 21 Cables that attach the Sub Board B to the Printer.
Unplug 3 Foil Cables and 18 Wire Cables.