Hardware Tests; Lcd Test; Button Test - Lexmark C720 Service Manual

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If single is selected, no buttons are active during printing. If
continuous is selected, return or stop can be selected to cancel
the test.
Note: The power indicator blinks while the page is printing. Check
each test page from each source to assist in print quality and paper
feed problems.

Hardware Tests

The following hardware tests can be selected from this menu:

LCD Test

DRAM Memory Test
Parallel 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.
Button Test
ROM Memory Test
Serial Wrap (if available)
Serial 2 Wrap (if available)
Diagnostic Aids
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