HP LASERJET P3005 - M4345 MFP;4345 mfp Series: Model Differences; PS112 Media Width Sensor Failure Modes

HP LaserJet M4345 MFP/4345mfp series
Differences between the M4345 MFP/4345mfp series
The table below lists all the differences between the older HP LaserJet 4345mfp and the newer
HP LaserJet M4345 MFP.
Item/Feature HP LaserJet M4345 MFP HP LaserJet 4345mfp
Product numbers
Base CB425A Q3942A
X CB426A Q3943A
XS CB427A Q3944A
XM CB428A Q3945A
Processor 480 MHz 533 MHz
Firmware flash NAND flash Compact flash
Control panel HP Easy Select Control Panel Graphical display
Hard drive 40 GB 20 GB
Connectivity USB device port Parallel port
Third party accessibility 2 internal USB host ports 2 internal flash slots
Scanner service strategy Whole unit replacement Parts are available to repair
PS112 media width sensor failure
modes and diagnostics
The HP LaserJet 4345mfp and HP LaserJet
M4345 MFP contain two paper width sensors
(PS106 and PS112) located in the toner
cartridge cavity. They are easily accessible
once the toner cartridge has been removed and
the jam access plate to the registration
assembly has been rotated up (see the photo
below). Photosensor PS112 is located next to
the gear train.
Photosensor PS112
HP LaserJet 4345 MFP
PS112 is the only photosensor in the 4345mfp
and M4345 MFP that can not be tested via the
Manual Sensor test or the Paper Path Sensor
test from the control panel. PS112 senses media
that is narrower than 7.4 inches (188 mm) as
well as residual media present in the paper
path. Diagnosing a failure of this sensor can be
difficult and time consuming. The process can
be made easier by understanding the sensor’s
failure modes and the appropriate
troubleshooting procedures.
(Continued on the next page.)
HP LaserJet MFP updates 14