Affected Products:
Single-Function: CS720, CS725, CS727, CS728, C4150, CS820, CS827 and C6160
Multifunction: CX725, CX727, XC4140, XC4143, XC4150, XC4153, CX820, CX825, CX827, CX860, XC6152, XC6153, XC8155, XC8160 and XC8163

Issue Description:
A mult-page print job with an alternating combination of single-sided and duplex A5-sized paper results in absent or severely faded print.
| | | |
Expected (Simplex - Letter) | Unexpected | Expected (Duplex long-edge A5) | Unexpected output by page 6 of the print job. |

What else is known:
The primary symptom occurs several pages into the print job.
Pausing or taking the printer offline allows for a brief continuation of printing.
Bar codes appear to instigate the condition.

Solution:
This issue has been addressed with a PE-build of firmware. Contact Lexmark Technical Support, reference this article ID #SO8578, and request firmware version PP.041.213a or greater.
Note:
You may be asked preliminary troubleshooting questions to verify that the symptoms described above accurately represent your printing anomaly.

Still Need Help?
Have the following available when calling Lexmark Technical Support;
Printer model(s)
Printer serial number
Toner/imaging unit/waste toner bottle part number and serial number
LEGACY ID: SO8578