What needs to be clarified
Locate the streak between printing and scanning paths, check glass condition and determine justified maintenance or diagnostic work before assessing the whole machine as unserviceable.
Materials to prepare
- MFP with asset identification and access to both scanner glasses
- Same control original and initial copies, scans and printouts
- Model instructions, fault record and previous cleaning information
What to compare
Compare internal test printing, flatbed and feeder scans using the same original and settings. Record streak position relative to feed direction. Inspect glass before permitted cleaning, then repeat the comparison. Associate remaining signs with a particular path; justify assembly replacement through separate diagnosis, rather than machine age.
Possible outcome of the analysis
Comparative test records and a defect list may separate removable contamination, confirmed faults and untested assemblies, supporting further maintenance or technical examination.
Limits of the conclusions
A vanished streak does not establish remaining component life. One mode cannot determine overall serviceability; the authorised party decides write-off using the confirmed condition.