- Printers
- Laser printer
clean-slit-glass
Kyocera Clean the slit glass on laser printer: ADF streak
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
Clean the slit glass. on a Kyocera ECOSYS multifunction printer flags dirt on the narrow glass strip that scans pages fed through the document processor. Unplug the power cord, open the document processor, and wipe the slit glass and white reading guide with a soft, dry cloth.
Safety first
Stop and check this first
- For safety, the operation guide instructs you to always unplug the power cord before cleaning the machine.
- Do not use water, soap, thinner or organic solvents to clean the slit glass: wipe the slit glass and reading guide only with a soft, dry cloth.
Safe checks you can perform
- Unplug the power cord and dry-wipe the slit glass and reading guide
- Clean the main platen glass and the back of the document processor
- Compare a copy made on the platen glass with one through the feeder
Leave these tasks to a qualified professional
- Do not attempt this professional task: Official service inspection of the slit glass and scanner carriage
- Do not attempt this professional task: Replacement of a scratched or permanently stained white reading guide
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Official service inspection of the slit glass and scanner carriage
What they doIf the slit glass and white reading guide are completely clean and unscratched yet the message or black streaks persist, an authorized Kyocera service technician must inspect the glass and the optical unit underneath.
They must show youthe condition of the slit glass surface and a streak-free test copy run through the document processor.
In writingthe internal cleaning or scanner part replacement performed.
Replacement of a scratched or permanently stained white reading guide
What they doWhen the white reading guide on the underside of the document processor is gouged, warped or stained with permanent ink, a qualified technician should replace the guide strip.
They must show youthe new white reading guide fitted in the document processor and a clean multi-page scan.
In writingthe document processor guide part replaced and the copy quality check result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Unplug the power cord and dry-wipe the slit glass and reading guide
- Who:
- you.
- How:
- for safety, unplug the power cord as required by the manual, open the document processor, and wipe the narrow slit glass (a) and the white reading guide (b) using only a soft, dry cleaning cloth.
- Result that matters:
- removing specks of dust or ink from the document processor scan line without leaving liquid film.
- If the message clears and copies fed through the document processor come out clean:
- a speck on the strip was the cause.
- If a black line still shows on document processor copies:
- inspect the slit glass closely under light for a stuck fleck.
- Evidence to keep:
- photo of the slit glass and white reading guide after wiping with the dry cloth.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
Clean the main platen glass and the back of the document processor
- Who:
- you.
- How:
- with the power cord still unplugged, wipe the large platen glass and the white backing of the document processor with a soft cloth dampened with alcohol or mild detergent (keeping liquids off the slit glass), let them dry and close the feeder.
- Result that matters:
- clearing smudges or adhesive marks from the rest of the flatbed scanning area.
- If both flatbed and document processor scans are clean:
- routine glass maintenance is complete.
- If the prompt or black streaks remain after cleaning:
- compare a flatbed copy against a feeder copy.
- Evidence to keep:
- sample copy taken before and after cleaning the glass.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
Compare a copy made on the platen glass with one through the feeder
- Who:
- you.
- How:
- plug the machine back in, place a clean original face down on the main platen glass to make one copy, then feed the same page through the document processor for a second copy.
- Result that matters:
- confirming whether the issue is isolated to the narrow slit glass or affects the whole scanner unit.
- If the flatbed copy is spotless while the feeder copy has a line:
- a tiny mark is still sitting on the slit glass.
- If both copies show defects or the message will not clear despite spotless glass:
- arrange a scanner check with official Kyocera service.
- Evidence to keep:
- both test copies labelled with which scan path was used.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Printers
- Brand
- Kyocera
- Product type
- Laser printer
Known code variants
- Kyocera black streaks document processor scan
- Kyocera Clean the slit glass
- Kyocera ECOSYS M2035dn Clean the slit glass
- Kyocera ECOSYS M2135dn limpiar cristal de paso
- Kyocera ECOSYS M2535dn slit glass
- Kyocera ECOSYS M2540dn cristal de paso
- Kyocera El cristal de paso se debe limpiar
- Kyocera Limpie el cristal de paso
- Kyocera rayas negras al escanear alimentador de originales
What it means
In the operation guide for the Kyocera ECOSYS M2030dn, M2035dn, M2530dn and M2535dn (and the Spanish guide for the M2135dn, M2040dn and M2540dn), the message Clean the slit glass. alerts you that the narrow glass strip beside the main platen needs cleaning. The print and copy quality table also points to a dirty slit glass whenever black streaks appear on copies or scans fed through the document processor. Other Kyocera models may differ in feeder layout, and the message alone never proves the scanner sensor or optics are faulty.
Warnings and stop conditions
- Highsource verified
For safety, the operation guide instructs you to always unplug the power cord before cleaning the machine.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
- Mediumsource verified
Do not use water, soap, thinner or organic solvents to clean the slit glass: wipe the slit glass and reading guide only with a soft, dry cloth.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
Symptoms and causes
Probable causes · in order
- Paper dust, correction fluid or ink stuck on the narrow slit glassCommon
Because sheets moving through the document processor pass over a fixed reading line, any speck on the slit glass sits directly in front of the scanner optics and triggers the prompt or vertical black streaks.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
- Dirt on the white reading guide opposite the slit glassCommon
The maintenance instructions require wiping both the slit glass (a) and the white reading guide (b) on the underside of the document processor, as marks on that guide affect scanning.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
- Streaks left by wiping the slit glass with liquid cleanersPossible
The manual explicitly warns not to use water, soap or organic solvents on the slit glass; damp wiping can leave residue that the scanner reads as dirt.
Evidence: Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages · Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
Virtual technician
Does clean-slit-glass still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Kyocera ECOSYS M2030dn, M2035dn, M2530dn, M2535dn Operation Guide - Responding to Error Messages
KYOCERA Document Solutions · 2017 · manual
- 2
Guía de uso Kyocera ECOSYS M2135dn, M2040dn, M2540dn - Respuestas a los mensajes de error
KYOCERA Document Solutions · 2023 · manual
Was this entry useful?