Diagnostic Aids; Next; Power-On Self Test (Post) - Lexmark 2591+ Service Manual

3. Diagnostic aids

This chapter explains the tests and procedures to identify printer failures and verify if repairs have corrected the
problem. The printer does not need to be connected to a computer or terminal to run these tests.
The tests include the following:
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The following are special machine modes that run when the printer is turned off and then back on:
Turn printer on while pressing
LineFeed
Tractor
Load/Unload and Tractor
Tearoff and Tractor with the
printhead at the left limit
Tearoff and Load/Unload with the
printhead at the left limit

Power-On Self Test (POST)

The following tests are automatically performed when the printer is turned on.
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If any errors occur during the POST tests, a combination of blinking LEDs indicates which test failed. See
"Start" on page
Power-on self test (POST)
Print test
Hex Trace mode (a computer or terminal is necessary)
Result
Prints print test with sample fonts.
Sets printer in Hex Trace mode.
Disables/enables Operator Panel
Lockout mode.
Resets the printer to the World Trade
defaults.
Resets the printer to the U. S. defaults.
LEDs Test—Checks operation of LEDs on the operator panel. The LEDs turn on and off after
the printer is turned on, and 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, and then
moves to the first print position.
Feed Initialization—Form feed motor rotates forward and then backward.
2-1.
2580+, 2581+, 2590+, 2591+
3-1
Diagnostic aids
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