Lexmark C520 Service Manual - Page 67

5022-xxx Step Questions / actions Yes 6 Turn the printer off. Connect the JLVPS1 cable to the system card. Remove one option/feature at a time, and turn the printer on to isolate the failing part. Warning: Observe all the ESD precautions (see "Handling ESD-sensitive parts" on page 4-1) and turn the printer off before any feature or option cards are removed or replaced. Is a failing part found? Replace the faulty part. Exit sensor service check No Contact your next level of support. Step Questions / actions Yes 1 Verify the paper is loaded properly in the manual feed slot. See "Loading media in the multipurpose feeder or manual feeder" on page 3-28. Is the paper properly loaded in the manual feed slot? Go to step 2. 2 Is the exit sensor flag damaged? Replace the fuser. See "Fuser removal" on page 4-60. 3 Is the JFUSER1 properly connected to the system card? Go to step 4. 4 Place a voltmeter between the JFUSER1 pin 7 and ground. Initially, the meter should indicate 5 V dc. Activate the exit sensor flag. Does the voltage drop to 0 V dc? Replace the system card. See "System card removal" on page 4-79. No Load paper in the manual feed slot. See "Clearing paper jams in the manual feeder" on page 3-29. Go to step 3. Reseat the connector. Replace the exit sensor. Input sensor service check Step Questions / actions 1 Is the input sensor flag damaged? 2 Is the JTRAY cable connector properly connected to the system card? 3 Place a voltmeter between JTRAY1 pin 2 and ground. Initially, the meter should indicate +5 V dc. Activate the input sensor flag. Does the voltage drop to 0 V dc? Yes No Replace the paper pick mechanism. See "Paper pick mechanism assembly removal" on page 4-68. Go to step 3. Go to step 2. Reseat the connector. Replace the system card. See "System card removal" on page 4-79. Replace the paper pick mechanism. See "Paper pick mechanism assembly removal" on page 4-68. 2-52 Service Manual