Lexmark 4227 Service Manual - Page 59
Diagnostic aids, Power-On Self Test (POST)
UPC - 734646117104
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4227-300 3. Diagnostic aids The printer contains self tests to help find and solve problems. You do not need to 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. • The power supply fan comes on. • LED Test-All LEDs turn on briefly. • LCD Test-All pels of the display are activated twice, and 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 that this function is working. • Button Scan Test-Scans all operator panel buttons. • NVRAM Test-Checks that the NVRAM data is correct. • The ribbon motor feeds ribbon. • The carrier moves to the left side frame, and then back to the right. • The auto Gap sequence occurs. If any errors occur during the POST tests, an error indicator shows which test failed. See "Start" on page 2-1. Diagnostic aids 3-1