Lexmark T652 Service Manual - Page 177

4062 Step Check Check the duplex guide assembly, front for damage. Is the above component free from damage? Yes Go to step 4. No Replace the duplex guide assembly, front. Go to "Duplex guide assembly, front removal (T652, T654)" on page 4-21. 3 4 Check the sensor (duplex input) for proper operation. 1. Enter the diagnostic mode 2. Select Duplex tests 3. Select sensor test 4. Observe the line item "input" Does the display on the operator panel, change every time the sensing area of the above sensor is interrupted or blocked. Go to step 6. Go to step 5. 5 Check the above sensor for proper connection. Is the above sensor connected properly? Replace the sensor (duplex input). Go to "Sensor (duplex input) removal (T652, T654)" on page 4-68. Replace the connection. 6 7 8 Check the aligner assembly for obstructions. Is the above component free from obstructions? Check the external duplex media path for obstructions. Is the above component free from obstructions? Check the external duplex unit assembly for proper installation. Is the above component properly installed? Go to step 7. Go to step x Go to step 9. Remove obstructions. Remove obstructions. Remove then properly re-install the external duplex unit assembly. Replace the external duplex assembly. 9 Check the sensor (duplex input) for proper operation. 1. Enter the diagnostic mode 2. Select Duplex tests 3. Select sensor test 3. Observe the line item "input" Does the display on the operator panel, change every time the sensing area of the above sensor is interrupted or blocked. Go to step 10. 10 Perform a print test using the duplex. Does the problem remain? Contact next highest level of tech support. Problem solved. Diagnostic information 2-143