Lexmark 4021-230 MS911

If the hardware test fails, replace the failing part.

Panel Test

This test verifies the function of the control panel display.

1. Enter the Diagnostics Menu, and then navigate to: Hardware Tests > Panel Test
2. Exit the test.

Button Test

This test verifies the function of each button on the control panel.

1. Enter the Diagnostics Menu, and then navigate to: HARDWARE TESTS > Button Test A pattern matching the control panel buttons appear on the display.
2. Press the control panel button to highlight the represented button on the display.
3. Release the button to remove the highlight.
4. Exit the test.

DRAM Test

This test checks the validity of the standard and optional dynamic random access memory (DRAM). The test repeatedly writes patterns of data to the DRAM to verify that each bit in the memory can be set and read correctly.

1. Enter the Diagnostics Menu, and then navigate to: HARDWARE TESTS > DRAM Test
2. Testing and resetting the printer messages appear on the display.
3. After the printer resets, the results of the test appear: DRAM Test [x] P:###### F:######.
   • [x] represents the size of the installed DRAM.
   • P:###### represents the number of times the memory test passed and finished successfully. The maximum pass count is 999,999.
   • F:##### represents the number of times the memory test failed and finished with errors. The maximum pass count is 999,999.
4. After the maximum pass or fail count is reached or when all the DRAM has been tested, the test stops and the final results appear.

Serial 1 Wrap

This test checks the operation of the serial port hardware using a wrap plug. Each signal is tested. If the test fails, then replace the controller board.

1. Disconnect the serial interface cable, and then install the wrap plug.
2. Enter the Diagnostics Menu, and then navigate to: HARDWARE TESTS > Serial 1 Wrap
3. Select a test from the list.
   • If the test passes, then the Pass Count increases by 1.
   • If the test fails, then a failure message appears on the display and the Fail Count increases by 1.
   The test stops after the maximum count is reached or when a failure occurs.

USB HS Test Mode

This test checks the USB ports for USB high speed certification.

1. Enter the Diagnostics Menu, and then navigate to: HARDWARE TESTS > USB HS Test Mode
2. Select the port and the type of test.

   Ports	Ports
   Port 0 Port 1 Port 2 Port 3	Test J Test K Test SEO NAK Test Packet Test Force Enable

3. To exit the test, reset the printer.
4. If the test fails, then replace the USB cable.