HP M234dw how to clean the scanner glass
When copies or scans show specks or smudges.
Steps
- Press the Power button to turn the printer off and unplug the power cable from the outlet.
- Lift the scanner lid.
CAUTION
Do not use abrasives, acetone, benzene, ammonia, ethyl alcohol, or carbon tetrachloride on any part of the printer; these can damage the printer. Do not place liquids directly on the glass or platen. They might seep and damage the printer.
Marked CAUTION by the manufacturer Source: Improve copy and scan image quality, p. 89
- Wipe the scanner glass and the white plastic backing under the lid with a soft cloth or sponge dampened with nonabrasive glass cleaner.
- Dry the glass and white plastic with a chamois or cellulose sponge to prevent spotting.
- Plug the power cable in and press the Power button to turn the printer on.
Source: Improve copy and scan image quality: Check the scanner glass for dirt and smudges Source: Improve copy and scan image quality: Check the scanner glass for dirt and smudges, p. 89
Used for
Other M234dw procedures
- How to clear a jam in the input tray (Er/04)When the display shows Er/04 and the paper is stuck at the tray.
- How to clear a jam in the printer base (Er/04)When the display shows Er/04 and the tray area is clear.
- How to clear a jam in the print cartridge area (Er/05)When the display shows Er/05.
- How to clear a jam in the document feeder (Er/41)When the display shows Er/41 on a model with a document feeder.
- How to clear a jam in the rear duplexer (Er/42)When the display shows Er/42.
- How to load paper in the input trayWhen the display shows Er/01 or the Paper light blinks for an empty tray.
- How to load an original in the document feederTo copy or scan several pages on a model with a document feeder.
- How to load an original on the scanner glassTo copy or scan a single page or a book page.
- How to clean the pickup rollerWhen the printer will not pick up paper and the earlier checks did not help.
- How to replace the toner cartridgeWhen the cartridge is near the end of its life and redistributing toner no longer gives acceptable print quality.
- How to redistribute toner in the cartridgeWhen the Cartridge light shows low toner but print quality is acceptable.
- How to inspect the toner cartridgeWhen pages print poorly or fully black.
- How to run Cartridge Cleaning ModeWhen pages show background shading, dark vertical bands or repeating horizontal banding.
- How to print a cleaning pageWhen pages show toner specks, spatter, smears, streaks, lines or repeating marks.
- How to make a copy from the scanner glassTo copy a page with the control panel.
- How to copy both sides of an ID cardTo put both sides of an identification card on one sheet.
- How to open the Embedded Web Server (EWS)Before any step that uses the EWS.
- How to connect the printer to Wi-Fi with HP SmartFor first setup, after switching Wi-Fi off, or after restoring network settings.
- How to connect the printer to Wi-Fi with WPSWhen the router has a WPS button.
- How to connect the printer to an Ethernet networkTo use a wired connection on a model with an Ethernet port.
- How to restore network settings to defaultWhen the printer must return to wireless setup mode.
- How to print a configuration reportTo see the printer usage log, event logs, network status and settings.
- How to print a Wireless Network Test ReportWhen the printer will not connect to Wi-Fi.
- How to restore the original factory defaultsTo undo disabled functions or changed settings.
- How to turn Cartridge Policy on or offTo limit the printer to genuine HP cartridges or lift that limit.
- How to change what happens at the Very Low cartridge stateTo make the printer stop, or keep printing, when toner is Very Low.
- How to adjust print densityWhen prints are consistently too light or too dark.
Sources
- User Guide, HP LaserJet MFP M232-M237 series. HP Development Company, L.P. Document c06759742, revision UG_EN (PDF created 2020-12-02), 154 pages, en. h10032.www1.hp.com (PDF). Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.