HP 8550 Service Manual - Page 544

Lifter motor failure Cause Poor contact in motor drive signal line connector Defective lift motor Step 1 2 Deck controller 3 PCB Checks Y/N Is J206 on the paper deck NO drive printed circuit board correctly connected? Can the error condition be remedied by replacing the motor? Can the error condition be remedied by replacing the deck controller PCB? YES YES Feed motor failure Action Correct the connection. Replace the motor. Replace the deck controller PCB. Cause Poor contact in feed motor drive signal line connector Defective feed motor Step 1 2 Deck controller 3 PCB Checks Y/N Are connector J207 and feed NO motor connector J315 on the deck controller PCB correctly connected? Can the error condition be remedied by replacing the feed motor? YES Can the error condition be remedied by replacing the deck controller PCB? YES Pick-up motor failure Action Correct the connection. Replace the feed motor. Replace the deck controller PCB. Cause Poor contact in pick-up motor drive signal line connector Step 1 Defective pick-up 2 motor Deck controller 3 PCB Checks Are connector J210 on the deck controller PCB and connectors J305 and J319 on the pick-up correctly connected? Can the error condition be remedied by replacing the pick-up motor? Can the error condition be remedied by replacing the deck controller PCB? Y/N NO YES YES Action Correct the connection. Replace the pick-up motor. Replace the deck controller PCB. 542 Chapter 7 - Troubleshooting EN