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HP LaserJet Quick Reference Service Manual Page 247

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Associated Part Number:
controller assembly: RG5-1560-060CN
The majority of formatter fan replacements have been for
noise. These replacements have been categorized into two failure
The fan/card cage assembly produces a strong pitch or tone due to
the fan rotational speed that causes the formatter cage to resonate.
Customers may be more sensitive to this noise because this fan is
the only fan on at all times.
Some fans may have a defective bearing which causes noise.
The operating speed of the fan has been re-engineered.
The fan speed has been reduced from 7,000 revolutions per minute
(rpm) to 5,000 rpm with no detrimental effect upon the printer operation.
Also, an inspection process was created to check for bearing defects.
The formatter fan has received a new part number RH7-1317-000CN
and is available now through regular parts distribution.
For the replacement procedure, refer to the LaserJet 4V and
4MV Service Manual , Second Edition (C3141-90929), section 6, pages
6-16; "Card Cage." The fan then can be removed from the card cage
assembly and the countermeasure fan installed.
Be sure to observe all warnings, notes, and cautions provided in this
Fan: RH7-1317-000CN or video
Technical Tips – 245


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