Power-On Self Test (Post) - Lexmark 2380 - Forms Printer B/W Dot-matrix Service Manual

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