Xerox AltaLink B8145/B8155/B8170 — 91-915
Xerox 91-915 means the black drum CRUM data cannot be read correctly. The guidance here is specific to AltaLink B8145/B8155/B8170 and the Black drum/CRUM operation.
Error meaning
The black drum CRUM data cannot be read correctly.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the code by itself on another printer family.
Applies to
AltaLink B8145/B8155/B8170
- AltaLink B8145
- AltaLink B8155
- AltaLink B8170
Common formatting
These are lookup/formatting aliases for this reviewed condition, not separate pages.
- 91-915
- 391-915
- 391.915.00
What usually causes it
- The machine cannot correctly read identification data from the black drum cartridge. This is a drum-recognition condition, not simply a low-toner warning, and the black drum is the component to isolate first.
- The exact condition recorded for this code is: The black drum CRUM data cannot be read correctly.
- Power down normally, use the standard drum-access procedure, reseat the black drum cartridge, and confirm it is the correct supported drum. Avoid touching the photoconductor surface while handling it.
What to try
Check the condition this code actually names
Restart, then reseat the black drum cartridge; replace the drum if the fault follows it.
Isolate the affected part of the workflow
Power down normally, use the standard drum-access procedure, reseat the black drum cartridge, and confirm it is the correct supported drum. Avoid touching the photoconductor surface while handling it.
Run a controlled confirmation test
Restart and check whether 91-915 returns before replacing unrelated color supplies. If a known-correct black drum is available, a controlled substitution can show whether the error follows the drum.
After each corrective action
Retry the original operation that produced 91-915. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If multiple correct black drums produce the same code in the same machine, record that result because it points away from a single defective cartridge.
When service may be needed
Do not clean or bridge identification contacts with abrasive tools and do not enter service resets. Persistent CRUM-reading failure should be handled by Xerox service.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official Xerox AltaLink B8145/B8155/B8170 support article.