6.15 CARTRIDGE INTERLOCK
SYSTEM
- FRONT
LOAD
MODELS
The front load disk drive
is
protected against physical damage by
an
electromechanical
interlock system. This system, described in Paragraph 3.11, prevents the operator from
removing a disk cartridge unless the disk drive is in the
Safe condition, the spindle has
stopped rotating,
and
the heads
have
been
fully retracted. Two solenoids
limit
the opening
of the front door until these conditions
have
been
satisfied.
The
interlock system also inhibits the start sequence
if
a disk cartridge has not
been
properly inserted
by
the operator. This condition is sensed by the interlock switch. The
interlock is actuated by appropriate logic and driver circuits located on the
Servo and Logic
PCBAs.
CAUTION
BEFORE ATTEMPTING
TO
START
A
FRONT
LOAD
DISK
DRIVE THE DOOR MUST BE FULL Y CLOSED.
6.15.1
CHECKING THE INTERLOCK
SYSTEM
Proper adjustment
of
the interlock system may
be
veritied as follows.
(1)
Prepare the disk drive to receive a disk cartridge as detailed in Paragraph 3.3.
(2)
Install
an
approved disk cartridge
as
detailed in Paragraph 3.4.1. Depress the
RUN/STOP switch.
(3)
When the
READY
indicator is illuminated, pull
on
the door handle with a pulling
force
of
approximately 10 pounds.
(4)
If the unit continues to function normally,
as
evidenced by continuous
illumination of the
READY
indicator, the interlock system adjustments are within
tolerance.
If the
Ready
condition is not maintained, perform the relevant
adjustment procedures detailed in Paragraph 6.15.2.
6.15.2
ADJUSTING INTERLOCK
SYSTEM
6.15.2.1 Test Configuration
(1)
Withdraw the disk drive forward to the full extent of the slides.
(2)
Remove the dust cover; refer to Paragraph 2.2, Step (5).
(3)
Apply power to the disk drive and allow the disk drive to come SAFE.
(4)
Determine
if
a cartridge is installed in the disk drive by following the unloading
Instructions contained in Paragraph 3.4.2,
Steps
(1)
through (4).
(5)
Remove the cartridge from the disk drive
if
one
is
installed.
(6)
Remove power from the disk drive.
6.15.2.2
Solenoid Plunger Clearance Test and Adjustment
When a solenoid plunger is manually depressed, the clearance between the right and left
door
link arms and the end
of
each solenoid plunger should measure between
1.016
mm to
1.524
mm
(0.040
to
0.060
inch). See Figure
6-32.
Solenoid adjustments are made as follows.
(1)
Right solenoid. Back
off
the two solenoid mounting screws and slide the solenoid
toward
or
away from the link arm
to
decrease or increase the gap
as
required.
Securely tighten solenoid adjusting screws.
(2)
Left solenoid. This adjustment is made with the door open using a long shank
Phillips screwdriver to loosen the left solenoid adjusting screws.
6-69
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