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Lead Screw Eccentricity
SECTION 5
CHECK' AN,D ADJUSTMENT
After measurement and adjustment in accordance
with SECTION 5, please surely clean the head.
5-1. LEAD SCREW ECCENTRICITY
Disassemble the following parts and then perform
the measurement and adjustment.
a.
Main Cover (Refer to 4-5)
b. Front Panel Ass'y (Refer to 4-2)
Em
c. Q_amper (Refer to 4-7)
Em
d. Head Load Ass'y (Refer to
4-8)
e. Cassette-up Ass'y (Refer to 4-9)
5-1·1. Tools and Measuring Equipment
a. Lead Screw Eccentricity Inspection Tool
b. Hexagon Wrench Torque Driver
c. Rotary Knob
d. MFD Checker II
5-1-2. Measurement
a. Connect the MFD Checker
n
to the disk
drive. (Refer to Fig. 2-.1) and step in the
head until it arrives at TRK 79.
b. Tum off the power.
c. Attach the rotary knob onto the rear shaft
of the stepping motor shaft with hexagon
wrench torque driver. (Refer to Fig. 4-13
(a»
Check if the gap between the motor
bearing metal and rotary knob is approxi-
mately 0.5 mm.
d. Revolve the rotary knob 3 to 4 turns
counterclockwise by hand.
e. Aligning the positioning hole of the lead
screw eccentricity tool to the positioning
pin on the chassis ass'y, set the lead
screw eccentricity inspection tool in place.
(Refer to Fig.
5-1)
f. - Tum the rot:lry knob clockwise or counter-
clockwise by hand.
Check if the gap
measures 50
p.m
(5 scales on the meter of
the lead screw eccentricity inspection tool)
or less.
5-1-3. Adjustment
a. Attach the rotary knob onto the stepping
motor shaft. (Reifer to Fig. 4-13 (a»
b. Loosen with a hexagon wrench torque
driver the two screws which- fasten the
coupling ass'y.
c. Pressing the coupling ass'y to the lead
screw, fasten the setscrew for the lead
screw with a hex~on wrench torque driver.
(with a torque of 0.7 kg-cm)
d. Pulling the stepping motor shaft, fasten the
setscrew for the stepping motor. (With a
torque orO.7 kg-cm)
e. Measure the lead screw eccentrifity in ac-
cordance with 5-1-2.
Unless the result meets the specification,
measurement should be carried out' again
starting with item "a".
Fig.5-' Lead Screw Eccentricity Adiustment
Em
5-2. PAD PRESSURE
Disassemble the following parts and then perform
the measurment and adjustment.
a. Main Cover (Refer to 4-5)
5-2-1. Tools and Measuring Equipment
a.
Tension Gauge
5-2-2. Measurement
a. Manually set the machine into the Disk-ln
mode. (Refer to Fig. 4-9 (a) )
b. Install a string to the tension gauge at one
end and tie the other end to the measuring
point. (Refer to Fig. 5-2 (a) )
c. Manually put down the HL arm, and then
set the machine into the Head
Load
mode.
d. Lift the pad arm with the tension gauge,
and then slowly put down the pad arm
until the gauge reading becomes unchanged.
-39-
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