HP LaserJet Quick Reference Service Manual Page 262

Volume i.
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User manual - 449 pages
Manual - 432 pages
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LJ IIIP, IIP
Plus, IIP
Moaning Sound in Separation Pad
Associated Part Numbers:
Description:
combination of separation pad wear and the use of smoother papers
can cause a vibration in the separation pad assembly. The vibration
occurs at a resonant frequency while paper is being fed into the printer.
This resonance is amplified by the lower frame pan, and results in an
audible moaning sound that continues the entire time the page is being
fed into the printer. An important diagnostic clue is the length of time
that the noise is audible. Note that some noise during the first second of
paper pickup from the MP tray is considered normal.
Solution:
A production change was made to the separation pad to
minimize the occurrence of the moaning sound in the separation pad.
The improved pad is indistinguishable from the previous pad to the
naked eye. The former part number, RG1-1912-000CN, can no longer
be ordered. The new part number is RG1-1912-080CN.
Note
This problem may still be exhibited when the customer uses
excessively smooth paper or the separation pad is worn.
260 – Summary of service notes and technical tips
After a certain amount of printer usage, the
RG1-1912-080CN - separation pad
EN

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