Lexmark Forms Printer 2400 Service Manual - Page 56
Power-On Self Test (POST), Font ROM/Microcode Sum Test - Checks that the ROM data is
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24xx Power-On Self Test (POST) The following tests are automatically performed when the printer is turned on. • LEDs Test - Checks operation of LEDs on the operator panel. The LEDs turn on and off after the printer is turned on, then all LEDs turn on for a few seconds. • RAM Test - Checks that the CPU can write/read the RAM. • Font ROM/Microcode Sum Test - Checks that the ROM data is correct. • Timer/Interrupt Controller Test - Checks that this function works. • NVRAM Test - Checks that the NVRAM data is correct. • Switch Scan Test - Checks the buttons on operator panel. • Carrier Initialization - Carrier moves to the left to activate the home position sensor, then moves to the first print position. • Feed Initialization - Form feed motor rotates forward and then backward. If any errors occur during the POST tests, a combination of blinking LEDs indicates which test failed. See "Start" on page 2-1. 3-2 Service Manual