HP 7475a Service Manual

Section VI
7475-A-25-1
PEN DOWN
SPRING
Figure 6-16. Measuring Pen Down Force
6-75. PINCH ROLLERS REMOVAL AND
REPLACEMENT
a. Remove the top case. Refer to To Case Removal.
b. Remove the retaining ring that secures the pinch
roller. See Figure 6-17.
PINCH
ROLLERS
Figure 6-17. Pinch Rollers
c. Remove the pinch roller.
d. Replace the pinch roller. The larger diameter end
of the pinch roller must be toward the outer edge
of the plotting surface. This is necessary to keep
the plotting media in place.
e. Replace the retaining ring.
f. Replace the pen carousel and top case making sure
the PAPER LOAD/HOLD lever extends through
the case and the tabs inside the front of the case
are aligned properly above and below the base
plate.
6-14
Model 7475A
6-76. PRINTED CffiCUIT ASSEMBLY REMOVAL
a. Remove the top case. Refer to Top Case Removal.
b. Disconnect all cables from the printed circuit
assembly.
c. Remove the pen carousel housing. Refer to Pen
Carousel Housing Removal.
d. Remove the screw holding the front panel, and
remove the panel. See Figure 6-18.
e. Remove the recessed screw between the pen sole-
noid and the pen drive motor. See Figure 6-18.
REMOVE
TWO
SCREWS
Figure 6-18. Chassis Assembly Removal
f. Lift the right side of the chassis assembly. Tabs
on the left side will release from the base plate.
g. Remove the screws or studs holding the rear panel
interface connector.
h. Lift the front end of the printed circuit assembly
and remove from the base plate.
L Reassemble in reverse order. When replacing the
top case, make sure the PAPER LOAD/HOLD
lever extends through the case and the tabs inside
the front are aligned properly above and below
the base plate.

HP 7475a Specifications

General

Brand	HP
Model	7475a
Category	Plotter
Language	English