Lexmark 2380 Service Manual - Page 70

Power-On Self Test (POST), Font ROM/Microcode Sum Test Checks that the ROM data is

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Power-On Self Test (POST) The following tests are automatically performed when the printer is turned on. • LEDs Test (Checks that the LEDs on the operator panel work. 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, then backward.) If any errors occur during the POST tests, a combination of blinking LEDs will indicate which test failed. See "Start" on page 2-1. 3-2

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3-2
Power-On Self Test (POST)
The following tests are automatically performed when the printer is
turned on.
•
LEDs Test (Checks that the LEDs on the operator panel work.
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, then
backward.)
If any errors occur during the POST tests, a combination of blinking
LEDs will indicate which test failed. See “Start” on page 2-1.