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Servo Motor Maintenance And Backlash Adjustments - HP -7035B Technical Manual

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a. Remove rear hood and platen. See paragraph 5-18.
b. Snap pen lift solenoid out of its spring holder and
remove holder and X-axis pointer by removing 1 mounting
screw.
c. Remove wiper assembly mounting screw and install
new wiper, Part No. 5060-4570.
5-27. POTENTIOMETER REPLACEMENT - Y-Axis
5-28. This unit is located in the carriage arm and is part of the
carriage channel. The channel and potentiometer are replaced
as one unit. Replace as follows:
a. Remove rear hood and platen. See paragraph 5-18.
b. Remove carriage arm and X-axis slidewire.
paragraphs 5-20 and 5-24.
c. Unsolder 3 wires, noting order of leads connected to
slidewire.
d. Install new slidewire assembly, Part No. 07035-
80750.
5-29. WIPER REPLACEMENT - Y-Axis
5-30. The wiper is made of a soft metal to absorb wear. The
wiper is located on the pen block.
should be obtained from the factory and installed as follows:
CAUTION
Damage to the flat mandrel slidewire may
result if other than factory supplied wiper
is used.
a. Remove rear hood and platen. See paragraph 5-18.
b. Remove pen scale. See paragraph 5-20.
c. Remove X-axis potentiometer. See paragraph 5-24.
d. Remove pen carriage arm. See paragraph 5-22.
e. Remove
wiper
unscrewing 1 0-80 screw and nut.
f. Install new wiper, Part No. 5080-7706.
g. After reassembling pen carriage, adjust pen carriage.
See paragraph 5-71.
5-31. SERVO MOTOR MAINTENANCE
5-32.
The magnetic field strength of the servo motor will
weaken if the rotor is removed from within the magnet. Upon
reassembly, it will be impossible for the motor to return to
specified
performance.
replacement and brush replacement or adjustment are
recommended.
New wiper assemblies
assembly
from
pen
block
Therefore,
only
servo
5-33. X-AXIS SERVO MOTOR REPLACEMENT
5-34. To remove:
a. Remove rear hood and platen. See paragraph 5-18.
b. Remove 2 No. 4-40 setscrews and slip flywheel off
motor shaft.
c. Stand recorder on side. Remove bottom cover. See
paragraph 5-18.
d. Unsolder 2 wires, noting their polarity.
capacitor.
e. Using Phillips screwdriver, remove 2 screws mounting
motor. See Figure 5-9.
See
FIGURE 5-9. SERVO MOTOR MAINTENANCE AND
f. Tilt motor so that drive belt can be disengaged.
Remove motor.
by
g. Reverse above steps to install.
h. Adjust X-axis drive belt. See paragraph 5-77.
5-35. Y-AXIS SERVO MOTOR REPLACEMENT
5-36. To remove:
a. Remove rear hood. See paragraph 5-18.
b. Move pen carriage to extreme left hand position.
motor
c. Stand recorder on right side. Remove bottom cover.
See paragraph 5-18.
BACKLASH ADJUSTMENTS
Remove 1
5-5

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