6.16.1 CHECKING
THE
INTERLOCK
SYSTEM
Proper adjustment of the interlock system may
be
verified
as
follows.
(1)
Prepare the disk drive to receive a disk cartridge
as
outlined in Paragraph 3.3.
(2)
Install a disk cartridge as detailed in Paragraph 3.4.3. Depress the
RUN
/
STOP
switch.
(3)
When the
READY
indicator is illuminated, apply approximately a 5-pound torque
to
the cartridge lock arm in the unlocking direction.
(4)
If the disk drive continues to function normally,
as
evidenced by continuous
illumination of the
READY
indicator, the interlock system upper
limit
adjustments
are within tolerance.
(5)
Actuate the RUN/STOP switch. When the SAFE indicator is illuminated, remove
the disk cartridge and
reinstall the lower cover of the cartridge,
and
then lock
the arm.
(6)
Actuate the RUN/STOP switch. If the solenoid does not lock in place the interlock
system
lower
limit
is within tolerance.
CAUTION
SHOULD
THE
ARM LOCK, REMOVE
THE
POWER
IMMEDIATEL Y AND
PROCEED
TO
MAKE CORRECTIVE
ADJUSTMENTS.
6.16.2 ADJUSTING THE INTERLOCK
SYSTEM
6.16.2.1
(1
)
Test Configuration
Extend the disk drive fully forward out
of
the rack; remove the disk cartridge
and
remove the source of power by disconnecting the line cord.
(2)
Remove the dust cover
as
described in Paragraph 2.2, Step (9). Elevate the Logic
PCBA to the maintenance position.
6.16.2.2
Solenoid Stroke Test
and
Adjustment
Check the stroke adjustment of the solenoid. With the solenoid plunger manually
depressed and the lock-arm unlocked, the distance from the
end
of the plunger to the
curved surface of the lock-arm body must be from
0.04 to 0.08 inches
as
shown
in
Figure
6-33.
If adjustment is required, loosen the adjusting screws and position the solenoid
body until the proper clearance is obtained.
6.16.2.3 Lock-Arm Travel Test and Adjustment
Check the lock-arm travel
by
rotating the lock arm to the locked position; attempt
to
insert
a
0.030-inch thick feeler gauge between the neck of the lock
arm
and the adapter casting,
as
shown in Figure 6-34. If the clearance is greater than 0.030-inch, adjust to correct
clearance by loosening the retaining screws and
sliding the solenoid body laterally across
the mounting bosses until the clearance is less than
0.030-inch. After completing the
adjustment, determine that the solenoid plunger is not binding against the lock
arm
body
and
is free to engage and disengage under its own spring force. Ensure that the stroke
adjustment detailed in Paragraph 6.16.2.2 has not changed.
6-72
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