HP LaserJet Quick Reference Service Manual Page 229

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Microswitch Assembly in the 2,000-Sheet Input Tray
Service Note Number:
C3166A-13, C3167A-13
Serial Number Range:
LCF00000 to LCF99999
Affected Part Number:
C3168-69003
Part Required:
RG5-2546-000CN
Situation:
A microswitch, located at the center top of the HCI tray,
has been implemented to protect the tray's functionality. When
depressed, this microswitch displays "TRAY 4 EMPTY", causing the tray
to not lift at all. For unknown reasons, this microswitch has been failing
or breaking. When this happens, replacement of the whole unit is
required because the microswitch was not set up as a spare part and is
not documented in either the service or operator manuals.
The purpose of this switch is to avoid serious damage to Tray 4 if a
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customer loads Letter or A4 paper sizes (portrait orientation) in the right
side of Tray 4, and stocks paper or any other media in the empty left
side at the same time. If this happens, the tray will be unable to lift all
the way up because the microswitch is depressed. The depressed
microswitch disables the current of the lifting motor, thus avoiding
serious damage to Tray 4.
Solution:
Work is currently underway to obtain samples from the
field in order to perform a failure analysis and to design a
countermeasure.
It is strongly recommended that customers do not stock paper in the
empty space of the HCI. Results of usability tests indicate that users do
not pay attention to the warning label attached on the bottom-left side
of Tray 4.
Technical Tips – 227
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