Power-on self test (POST) sequence of Lexmark X746 and X748

Power-on self test (POST) sequence on Lexmark X746 and X748 MFP

When you turn the printer on, it performs a Power-On Self-Test. Check for correct POST functioning of the base printer by observing the following:

1. The operator panel turns on and displays the Lexmark logo.

2. A progress bar displays.

3. The LED turns on.

4. The main fan turns on.

5. The machine performs the following tests: a. Sensor check b. Motor check—initializes the following motors:

i. Cam motor

ii. EP drive motor

iii. Fuser motor

iv. Cartridge motor c.

Supplies check 

Note:  The LED blinks red and an error message displays on the operator panel screen if the machine detects errors during these test phases.

6. The LED light indicator blinks.

7. The loading screen displays.

920.26—POST service check

1.       Open the top access cover. 

                       Is the top cover sensor damaged? 

                       Solution: Replace the top cover sensor

2.        

§  Turn the printer off.

§  Remove the rear frame cover.

§  Check the cable in the connector JFDS1 for proper connection to the system board, pinch points, and the cable or connector for any other damage.

Is the cable damaged? Solution: Replace the top cover sensor

          3.

§  Disconnect the cable in connector JFDS1.

§  Connect the new top cover sensor.

§  Enter Diagnostics mode (press and hold buttons 3 and 6, turn on the MFP, and release    the buttons when the progress bar displays.

§  Touch Sensor Tests.

§  Touch Dynamic Sensors.

§  Touch Top Door.

§  Activate the top cover sensor by pressing the flag as shown.

                           Does the display on the touchscreen change from Open to Closed?

                           Solution: Replace the Systemboard

_________________________________________________________________________

920.27, 920.28, 920.29—POST (power on self-test) option tray error service check

1. Is the specified option the 550-sheet tray?

    Solution: Replace the 550-sheet tray with a new 550-sheet tray option.

2. Is the specified option the special media tray?

   Solution: Replace the special media tray with a new special tray option

3. Is the specified option the high-capacity input tray (HCIT)?

  Solution: Replace the HCIT controller board assembly

          _________________________________________________________________________

920.32—MPF paper present sensor not connected service check

1.  Check the cable in connector JMPFPP1 for proper connection, reseat cable. Did the error clear?

2.

• Check the connection on the paper present sensor side.
• Check for damage and pinch points on the cable.
• Reseat cable.

Solution: If No go, Replace the MPF paper present sensor

          _________________________________________________________________________

925.01, 925.03, 925.05—Fan error service check

1.

Turn the printer off.

Remove the rear frame cover.

Check the cable in connector JFAN1 for proper connection to the system board, for pinch points, and for any other damage to the cable or the connector.

Is the cable damaged? Solution: Replace the fan

2.  Measure the continuity across all the fuses on the system board.

    Are any of the fuses blown? Solution: Replace the Systemboard

3

§  Turn the printer off.

§  Remove the rear frame cover.

§  Check the cable in connector JBLW1 for proper connection to the system board, for pinch points, and   any other damage to the cable or connector, and reseat the cable.

Did the error clear? Solution: replace the Systemboard

_________________________________________________________________________

Lexmark X548 Potential Field Issues

900.43 Error When Printing PDFs

• The printer reports a 900.43 error when trying to print a PDF.
• This error may be caused by low level firmware.  Update the printer’s code to the latest level.
• If you need a quick workaround, go into the printer driver and select “Disable PostScript passthrough”.  This should allow you to print without the error.

                                        

230.31 Paper Jam

• The printer constantly reports 230.31 paper jams when first powered on or after a tray is pulled.
• If the printer is located on a surface that isn’t level (more than 6mm out of level) or is straddling 2 tables, the weight of the printer may be supported by the paper tray instead of the frame. 
• This may cause the tray to rise up and the S1 sensor flag move out of position.  This will cause the printer to believe that media is present in the paper path.
• Check to see if the printer is on a hard, flat surface and is level.  If the table is bowed or warped, the printer may not be resting on all the feet.
• Verify that the printer is sitting on a single surface (not two tables).
• Verify that the printer is sitting on a table large enough to accommodate all 4 feet.

                                 

Lexmark CX510 “Milky” Appearance on Paper

Lexmark CS310/CS410/CS510 &CX310/CX410/CX510

Field Awareness

The following slides contain issues that were seen during product testing and may occur in the field.  Please familiarize yourself with each of these issues, as you will be tested on the key concepts at the end of the lesson. Samples and reference images are provided where available.

Toner Cartridge Replacement Guidelines

• When to replace the Cartridge:
• Broken port shutter–Smart Chip read errors (31.4X)
• Cartridge motor stalls (201.2X)
• DO NOT replace the Cartridge for PQ defects!
• All PQ defects are associated with the Imaging Unit.
• The Cartridge does not contain any EP components.

“Milky” Appearance on Paper

• This defect is created when toner melts and moves prior to receiving pressure in the fuser. 
• This movement exposes the media color under the toner and creates a light, “milky” appearance on the media.
• This primarily could happen in high humidity environments when the edges of the media become saturated with moisture while the center stays dry. 
• This creates waviness (or rippling) in the edges of the media which cause the paper to enter the fuser unevenly.

Things you can try to resolve the problem:

• Try a new ream of paper (that has never been opened) in the Tray.  
• Check the media settings in the printer and verify they are correct for the paper type/weight used.
• Flip the paper in the Tray so the rippled edge enters the printer last.
• Keep media out of any direct airflow from an air handling vent.
• Store unused media in an air tight container to keep it dry until needed.
• If you are using 16lb media for duplex try a heavier media (20 or 24lb).

If none of these suggestions work, try replacing the fuser.

Horizontal Void/Light Line at 94mm Spacing

Problem Description:

Horizontal light lines or wrinkle-looking defect on one or both edges of an image repeating at 94 mm (~3 ¼ in) down the page.  The defect will be seen best on heavy coverage prints.  See print samples below.

Most Likely Cause:

A tear or crack on the Fuser belt due to stress.

Resolution:

·         Replace the fuser if it is not at the end of life.

·         Make sure to Reset the Fuser Count and run the Motor Calibration in Configuration Menu immediately after installing the new fuser and prior to sending any print jobs.

Print quality defect: Repeating lines

Sharp lines on Page after Scanning from ADF –MFP Only

Problem Description:

Fine vertical lines on the page after scanning from the ADF.

Most Likely Cause:

Debris on the ADF glass.

Resolution:

Clean the scanner glass as well as the ADF glass.

Stretched Text/Image from ADF; Clicking Noise in ADF – MFP Only

Problem Description:

A portion of the scanned page looks stretched, smudged or smeared.  A clicking noise may be heard from the ADF. See picture on the right.

Most Likely Cause:

Dirty pick roller or a defective skew sensor card.

Resolution:

• Verify that the pick roller assembly is in good condition and working properly.   Clean the pick rolls    with a lint-free cloth dampened with alcohol.

• If you hear a consistent clicking noise while making a copy, replace the skew sensor card.  This card is in the ADF Front Case Assembly.

No Display, Lines in Display – C74x/X74x

Problem Description:

The display is blank, or lines appear in the display.  The printer may seem dead.

Most Likely Cause:

The operator panel flex cable is dislodged from the connector on the system board or it is damaged.  See the picture on the right.

Resolution:

Inspect the operator panel flex cable at the system board: if the edge is rolled up, replace the cable. If the cable is undamaged, reseat the cable.

Background:

   • Early operator panel cables do not have wings to secure them to the connector on the system board.

   •If the printer is jostled during shipping, it is possible for this cable to become unseated or damaged.