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3-2 Service Manual
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.