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5 Check the left arm drum lock in the
upper left of the printer. If it is broken, it will
be in the down position.
Location of cartridge alignment knob and detail
6 Reseat the ITB. Ensure that the levers are
down and that the shipping locks are
removed if the printer is new. If the printer
still shows the error, measure the gap
between the belt and the metal bracket on
the bottom end of the ITB.
Left arm
drum lock
If the gap is 1 to 2 mm (.04 to .08 inches),
then the ITB is in the correct position; if the
gap is 5 to 6 mm (.2 to .23 inches), then the
ITB is alienated and in mono printing mode.
If there is a wide gap, try rotating the large
white gear on the bottom-right of the ITB
clockwise. It may offer some resistance, but
the belt of the ITB should move closer to the
metal bracket. If the gear is broken or will
not turn, the ITB may need to be replaced.
Tip of lock that
may be broken
If the gear is in good condition, but opening
and closing the door causes it to disengage,
then the ITB gear train may need to be
replaced.
Left arm drum loc
k
7 Check the cartridge alignment knobs on the
left side of the printer. If the small white latch
is missing, or the black piece immediately
behind it is broken, the printer must be
replaced. This part may not be replaced in
the field due to the delicate alignment
necessary to ensure correct cartridge
positioning. If the piece is missing, the door
may have some difficulty in closing and all
of the cartridge shutters may not shut. If all
the other steps have been taken and this
piece is identified, the printer must be
replaced.
Black piece that
holds white
latch in place
Cartrid
g
e ali
g
nment knob
C
HP Color LaserJet 3500/3700 printer updates 5