HP LaserJet 5800zf fuser error 50.11.14, but fuser seem to be OK

[harry868]

Hi guys,

I have wired fuser related problem with an HP LaserJet 5800zf.  In most cases I get a 50.11.14 fuser error either on the first page or after a couple of pages. The paper is stuck in the middle of the fuser. HP sent a replacement fuser, but the replacement fuser is rejected on power up with error 50.2F.00. However, the “rejected fuser” works flawless in another HP 5800zf with same configuration and firmware. Inserting another new fuser (from a working 5800zf) to the machine with the 55.11.14 error scenario the 50.11.14 error persists on this machine. Hence, it seems all fusers are OK, but it is unclear why one fuser is rejected but works in other machines. In the meanwhile, HP swapped the formatter board as well as the low voltage power supply, but the 50.11.14 error persists. Wired enough if you configure for a paper type “pre-Rotation Mode” (Banding issue parameter)  it takes longer to print, but as of now it seems the 50.11.14 error disappears. I assume this is just a (temporary) workaround and not the root cause. Can you guys help me out with a suggestion? BR, Harald

[TheOutlawed]

Hi @harry868 

That's an exceptionally detailed and confusing set of symptoms! Given the extensive part swapping you've done, the evidence strongly suggests an issue with the Main Drive Assembly or, less likely, the DC Controller Board, which manages the fuser's power and rotation.

Based on the pattern of failure and the effectiveness of the pre-Rotation Mode workaround, the root cause is most likely the Main Drive Assembly or its associated control circuitry, specifically related to the fuser rotation.

1. Main Drive Assembly (Mechanical/Rotational)

The fuser is a driven component, meaning a motor (part of the Main Drive Assembly) turns its gears. If the main drive motor or the mechanical coupling is failing, it can cause the fuser to rotate at an incorrect speed, or an encoder sensor (which measures the motor's rotation) could be sending back bad timing data.

• A failing drive motor or worn gear train delivers inconsistent rotation to the fuser. At normal speed, this causes the 50.11.14 error (incorrect rotation/timing). When you switch to "pre-Rotation Mode," the slower speed masks the mechanical issue enough for the error to be suppressed.

• I'd suggest to reach out to HP to request HP to replace the Main Drive Assembly (Motor and Gear train).

2. DC Controller Board (Control Circuitry)

The DC Controller Board (DCC) is the main hub for power and motor control. It takes signals from the Formatter and executes the motor commands. Even though the LVPS was replaced, the DCC itself could be faulty.

• The DCC contains the circuitry that controls the speed of the Main Drive Motor and also performs the fuser's authentication check. A fault here could be:

  • Failing to correctly regulate the motor speed (causing 50.11.14).

  • Failing to properly read the authentication chip on new fusers (causing 50.2F.00).

• If the drive assembly doesn't solve the issue, request replacement of the DC Controller Board.

3. Fuser Authentication Conflict (Why 50.2F.00?)

The most peculiar symptom is the 50.2F.00 error on the new fuser. This error typically means the printer's firmware or security check has rejected the fuser as incompatible or non-genuine.

• The fact that the "rejected" fuser works in another machine means the fuser is fine.

• The fact that a new Formatter didn't fix the rejection means the Fuser Authentication Data is likely stored on the DC Controller Board (or another non-swapped board) or is a direct result of a power fault on one of those boards.

Recommendation(personal): Focus on replacing the Main Drive Assembly first, as the paper jam and the "pre-Rotation Mode" workaround most strongly indicate a mechanical/rotational issue which causes the 50.11.14 error. The other error (50.2F.00) might be a secondary symptom of the same failing board (DC Controller) that also controls the fuser's motor.

In other words, I'd suggest taking it to a nearby service center for further support. To find the nearest service center in your region please visit https://support.hp.com/in-en/help/service-center