Lexmark Optra C Service Manual - Page 106

5045-001 3. Diagnostic Aids This printer has three different methods of running diagnostics. The printer can run internal diagnostics tests. These tests are in the same format as the other Optra models and are described in this chapter. These tests work in conjunction with the "Power-On Self Test (POST)" on page 2-8. The printer may be tested without the video controller board. The basic engine test will isolate a failure to either the engine or the video controller board. If the printer is configured with the optional sheet feeder or any of the internal options, remove the option(s) and run one of the three diagnostic methods to determine where the problem is located. There are six internal engine tests accessible by the "Density Adjustment Panel" on page 3-12. The tests run with or without the video controller board. Basic Engine Test This test eliminates the video controller board as the source of a malfunction. 1. Turn the printer off. 2. Disconnect the controller board by sliding it to the rear 1 inch. The display will not function now. 3. Remove the small access cover on the left side cover. 4. To prevent a short or damage to the machine, use an insulated jumper and jumper pin 8 to pin 3 of connector J109, connecting pin 8 first. See "DC Controller Board Connector Locations (Graphic)" on page 5-18. 5. Turn the printer on, and observe the POST sequence "PowerOn Self Test (POST)" on page 2-8. If the printer completes POST, the basic engine is functioning properly. 3-1