To
test
for
correct operation. perform the following.
(1)
Remove power from the
disk
drive.
(2)
Elevate the Logic and Servo PCBAs
to
the maintenance position.
(3)
Remove connector
P109
from the Logic PCBA.
(4)
Connect a suitable
continuity
indicating device, such
as
an
ohmmeter,
to
pins 1
and 2
of
P109.
(5)
Apply power
to
the
disk
drive.
(6)
When the SAFE indicator becomes illuminated, open the front
door
and install a
disk cartridge.
(7)
Slowly close the
door
and note where the switch establishes
continuity.
NOTE
The
cartridge
must
not
have completed its travel
at
this
point
and should
not
be completely seated.
(8)
Reinstall
P1
09
onto
the Log ic PCBA.
(9)
If the requirements
qf
Step
(7)
are not met, perform the adjustment procedure
contained in Paragraph 6.15.2.4.
6.15.2.4
Interlock Switch Adjustment
(1)
Remove the disk cartridge.
(2)
Adjust the actuating leaf of the interlock switch by bending the leaf with a pair
of
long-nose pliers.
(3)
Return the
disk
cartridge
into
cartridge receiver and perform the test procedure
contained in Paragraph 6.15.2.3,
Steps
(1)
through (7).
(4)
Open and close the
door
several times with the disk cartridge in place
to
ensure
rei iable operation.
(5)
Disconnect the indicating device connected to
P109
in Paragraph 6.15.2.3,
Step (4).
(6)
Reinstall
P109
onto
the Logic PCBA.
(7)
Lower the Logic PCBA from the maintenance position
to
the normal operating
position.
(8)
Replace dust cover and return the
disk
drive into enclosure.
6.16 CARTRIDGE INTERLOCK SYSTEM - TOP LOAD MODELS
The top load disk cartridge is protected against physical damage by
an
electromechanical
interlock system. This system, which is described in Paragraph 3.11, prevents the operator
from removing a disk cartridge unless the drive is in the
Safe condition, the spindle has
stopped rotating and the heads have been
fully
retracted. It also
inhibits
the Start
sequence when the cartridge has been improperly installed by the operator.
The interlock mechanism is located on the rim of the cartridge adapter assembly and
consists of a cartridge lock arm, a snap-action interlock switch, and a solenoid. When
properly positioned, the arm and the solenoid prevent cartridge removal. The interlock
switch senses when a disk cartridge is properly installed.
In
addition to the interlock mechanism, suitable logic and drivers are provided
on
the
Servo and Logic PCBAs to control the system. Electrical connections are made via
connector
P109
to the Logic PCBA.
6-71
630D
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