Xerox 377-900: Registration-sensor static jam
Xerox 377-900 means registration-sensor static jam; Xerox recommends checking paper path, tray settings, media specification, and paper condition before service. This guidance is specific to WorkCentre 7525/7530/7535/7545/7556 platform and the Paper / Feed / Transport subsystem. Remove accessible jammed paper.
Error meaning
Registration-sensor static jam; Xerox recommends checking paper path, tray settings, media specification, and paper condition before service.
This interpretation is tied to the reviewed family/platform and subsystem. Do not reuse the visible code by itself on another printer family.
Applies to
WorkCentre 7525/7530/7535/7545/7556 platform
- WorkCentre 7525
- WorkCentre 7530
- WorkCentre 7535
- WorkCentre 7545
- WorkCentre 7556
Common formatting
These are lookup or formatting aliases for this reviewed condition, not separate pages.
- 377-900
What usually causes it
- 377-900 is a registration-sensor static jam, so the useful evidence is paper position, tray setup, and media condition around registration rather than a generic “paper jam” reset.
- The exact reviewed condition is: Registration-sensor static jam; Xerox recommends checking paper path, tray settings, media specification, and paper condition before service.
- Remove accessible jammed paper, reload a clean stack, verify tray size/type settings, and confirm the media meets the printer specification. Do not change multiple trays at once.
What to try
Check the condition this code actually names
Remove accessible jammed paper, reload a clean stack, verify tray size/type settings, and confirm the media meets the printer specification. Do not change multiple trays at once.
Keep the test focused
Change only the setting, supply, paper path, or component named above. Leave unrelated network, driver, and service settings alone so the retest tells you something useful.
Run a controlled confirmation test
Retry one page from the same tray. If it works, repeat the original job; if another tray works while the first does not, preserve that tray-specific pattern.
After each corrective action
Retry the original operation that produced 377-900. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If 377-900 returns without visible paper, record the tray, size, weight, and where the sheet stops. Repeated sensor-state faults after a clear path are service evidence.
When service may be needed
Do not probe registration sensors with tools or defeat tray/interlock switches. Stop at normal jam clearance and media checks.
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
Xerox Fault Code 377-900: Reg Sensor Static Jam. Meaning and troubleshooting are paraphrased for this reviewed scope.