Lexmark 5021-0XX - Manual (Page 217)

Diagnostic aids 3-9
5021-0XX
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 or 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 or Stop to cancel the test.
Parallel wrap test
This test is used with a wrap plug to check operation of the parallel
port hardware. Each parallel signal is tested.
To run the parallel wrap test:
1. Disconnect the parallel interface cable and install the wrap plug
(P/N 1319128).
2. Select the Parallel Wrap Test from the menu.
The power indicator blinks indicating the test is in progress. The
test runs continuously until canceled.
Each time the test finishes, the screen is updated with the result
(Display shows P:###### for pass and F:###### for fail). If the
test passes, the pass count increases by 1, however if the test
fails, one of the following messages display for approximately 3
seconds and then the fail count increases by one.
Sync Busy Error Byte Interrupt Request Error
Strobe Interrupt Request Error Init Fall Error