Copy Module M The fan comes on. M The start button LED lights yellow and then goes off. M The Carrier Unit moves to the home position, as detected by the Home Position Sensor. (A grinding noise indicates the shipping lock is in place or an object is blocking the Carrier Unit.) M The ADF clears any paper loaded or partially in the paper path. M The back light on the Front Panel turns on. (Stopping here indicates that the unit has a bad display or connection. This is particularly true if the Copy Processor is functional.) M HP Digital Copier displays on the screen to confirm that the display and connections are good and the Copy Processor is able to boot from ROM.
M The copy module polls for an HP LaserJet 8150. If it is not there, the copy module will continuously monitor the bus for one. (The power on order does not matter for the printer or copy module.) M The four icons and the status bar display. M The main menu displays. G The copy module awaits the start command. 244 Chapter 5 Functional Overview C4265-90907