Lexmark Optra C710 Service Manual - Page 202

5016-001 Diagnostic Mode To enter the Diagnostic Mode: 1. Turn the printer off. 2. Press and hold the GO and RETURN buttons. 3. Turn the printer on. 4. Release the buttons when "Performing Self Test" displays on the operator panel. The tests display on the operator panel in the order shown: • Print Registration - Setting Left Margin - Setting Top Margin • Print Tests - Tray 1 - Tray 2 (displayed only if Tray 2 is installed) - Tray 3 (displayed only if Tray 3 is installed) - Multipurpose Feeder (displayed only if a multipurpose tray is installed) - Print Quality Pages • Hardware Tests - LCD Test (Operator panel) - Button Test (Operator panel) - DRAM Memory Test - Parallel Wrap Test - Parallel 1, 2, or 3 Wrap Test (displayed only if a parallel port is available via PC1 in slot 1, 2 or 3) - Serial Wrap Test (displayed only if the printer supports a standard serial port - Serial 1, 2 or 3 Wrap Test (displayed only if a serial port is available using PC1 slot 1, 2 or 3) 3-4 Service Manual