Xerox 077-128: Inverter input sensor on jam
Xerox 077-128 means inverter input sensor on jam; Xerox directs the user to the inverter/right-side paper path, media checks, restart, and retry. This guidance is specific to PrimeLink B9100/B9110/B9125/B9136 platform and the Paper / Feed / Transport subsystem. Clear only accessible paper in the inverter/right-side path.
Error meaning
Inverter input sensor on jam; Xerox directs the user to the inverter/right-side paper path, media checks, restart, and retry.
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
PrimeLink B9100/B9110/B9125/B9136 platform
- PrimeLink B9100
- PrimeLink B9110
- PrimeLink B9125
- PrimeLink B9136
Common formatting
These are lookup or formatting aliases for this reviewed condition, not separate pages.
- 077-128
What usually causes it
- 077-128 identifies the inverter input sensor in the right-side/duplex paper path. It is especially relevant when a sheet is being redirected for two-sided or inverted output.
- The exact reviewed condition is: Inverter input sensor on jam; Xerox directs the user to the inverter/right-side paper path, media checks, restart, and retry.
- Clear only accessible paper in the inverter/right-side path, inspect the sheet for curl or damage, and verify the selected media is suitable for the requested duplex/output operation.
What to try
Check the condition this code actually names
Clear only accessible paper in the inverter/right-side path, inspect the sheet for curl or damage, and verify the selected media is suitable for the requested duplex/output operation.
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
Run a simple one-sided page, then a duplex page. If one-sided output succeeds but duplex repeats 077-128, the inverter path is isolated.
After each corrective action
Retry the original operation that produced 077-128. If it works, stop there rather than moving into unrelated troubleshooting.
If the code returns
If the code returns with no visible sheet, note whether the paper reaches the right-side inverter area and whether the failure is limited to one media type.
When service may be needed
Do not dismantle the inverter or sensor assembly. Persistent inverter input-sensor faults require 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
Xerox Fault Code 077-128: Inverter In Sensor On Jam. Meaning and troubleshooting are paraphrased for this reviewed scope.