Lexmark T620 Service Manual - Page 180
Hardware Tests, LCD Test, Button Test
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4069-5XX/7XX Hardware Tests The following Hardware Tests can be selected from this menu: LCD Test Button Test DRAM Memory Test ROM Memory Test Parallel Wrap (if available) Parallel 1 Wrap (only displayed if PCL installed in slot 1) Parallel 2 Wrap (only displayed if PCL installed in slot 2) Serial Wrap (if available) Serial Wrap 1 (only displayed if PCL installed in slot 1) Serial Wrap 2 (only displayed if PCL installed in slot 2) 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. 3-14 Service Manual