HP LaserJet 4000 Printer series - Manual (Page 70)

EN
Chapter 3: Printer Maintenance 59
Cleaning the Printer
To maintain print quality, follow the cleaning procedure (on the
following page) every time the toner cartridge is changed, or
whenever print quality problems occur. As much as possible, keep
the printer free from dust and debris.
•
Clean the outside of the printer with a slightly water-dampened
cloth.
•
Clean the inside with a dry, lint-free cloth.
Caution Do not use ammonia-based cleaners on or around the printer.
While cleaning the printer, be careful not to touch the transfer roller
(the black, rubber roller, located underneath the toner cartridge).
Skin oils on the roller can cause print quality problems.
Figure 17 Location of the Transfer Roller—Do Not Touch!