HP 8550 Service Manual - Page 546

Cause Step Registration roller 4 Gears 5 Poor contact in 6 feed motor drive connectors Feed motor 7 breakdown Feed sensor 8 Feed sensor 9 breakdown Feed roller 2 10 Deck controller 11 PCB Checks Y/N Is the registration roller worn, YES defective, or dirty? Remove the feed assembly and check drive gears and springs. Are there any worn or damaged parts? Are there any loose parts? YES Are connector J205 and relay NO connector J302 on the paper deck drive printed circuit board correctly connected? Can the error condition be YES corrected by replacing the feed motor? Are the feed sensor lever and springs damaged or defective? Is the sensor lever spring loose? YES Can the error condition be YES corrected by replacing the feed sensor? Is feed roller 2 worn, defective, YES or dirty? Can the error condition be corrected by replacing the deck controller PCB? YES Action Replace if worn or defective. Clean to remove dirt. Replace if damaged or defective. Correct spring position. Correct the connection. Replace the feed motor. Replace if damaged or defective. Correct spring position. Replace. Replace if worn or defective. Clean to remove dirt. Replace the deck controller PCB. Multi-feed jams Cause Step Separation roller 1 Springs 2 Checks Y/N Is the separation roller worn or YES defective? Is the spring that holds the NO separation roller functioning correctly? Action Replace the separation roller. Replace the spring if it is damaged. Correct its position if it is loose. Wrinkled paper Cause Rollers Step 1 Checks Y/N Check the pick-up assembly YES and feed assembly rollers. Are they worn or defective? Action Replace rollers if they are worn or defective. 544 Chapter 7 - Troubleshooting EN