Lexmark T520 Service Manual - Page 143
Hardware Tests, LCD Test, Button Test
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UPC - 734646620000
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4520-xxx Hardware Tests Select the following Hardware Tests from this menu: • LCD Test • Button Test • DRAM Memory Test • ROM Memory Test • Parallel Wrap (if available) • Serial Wrap (if available) • Serial 1 Wrap (if available) • Serial 3 Wrap (if available) LCD Test To run the LCD Test: 1. Select LCD Test from the Diagnostic menu. The LCD test continually executes the LCD display test. 2. Press Return/Stop to cancel the test. Button Test To run the Button Test: 1. Select Button Test from the Diagnostic menu. With no buttons pressed, several OP (Open) appear on the display. 2. Press each button one at a time and a CL (Closed) displays in place of an OP. The proper operation of each button can be checked. 3. Press Return/Stop to cancel the test. Diagnostic Aids 3-11
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