Diagnostic aids, Power-on self test (post) – Lexmark 4227-X00 User Manual
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Diagnostic Aids
3-1
4227-X00
3. Diagnostic Aids
The printer contains self tests to help find and solve problems. You
need not connect the printer to a computer or terminal to run these
tests.
Types of self tests are as follows:
•
Power-On Self Test (POST)
•
Hex Trace Mode (a computer or terminal is needed)
•
Print Tests
•
Error Log
Power-On Self Test (POST)
The Power-On Self Tests diagnose the basic hardware printer
functions and initialize the default value settings. POST starts
automatically when power to the printer is turned on, or when the
printer receives an INIT signal from the controller.
•
Power supply fan turns on.
•
LED Test - All LEDs turn on briefly.
•
LCD Test - All pels of the display are activated twice, then
"initialize" is displayed.
•
RAM Test - Checks that the CPU can write/read the RAM.
•
ROM Test - Checks that the ROM data is correct.
•
Timer/Interrupt Controller Test - Checks this function is working.
•
Button Scan Test - Scans all operator panel buttons.
•
NVRAM Test - Checks that the NVRAM data is correct.
•
Ribbon motor feeds ribbon.
•
Carrier moves to the left side frame and back to the right.
•
Auto Gap sequence occurs.
If any errors occur during the POST tests, an error indicator shows
which test failed. See
.