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2.4.2.3
Turn the two (2) nuts that attach the upper arm to the carriage
assembly
clockwise
with a
3/1
6"
nut
driver while holding the arm in the highest position.
2.4.2.4
Reverify the compliance of the magnetic head.
2.4.2.5
If the compliance cannot be adjusted, replace the upper arm (see Section 5.13).
2.5
WRITE PROTECT SWITCH ADJUSTMENT PROCEDURE
2.5.1
Connect the disk drive to an exercisor or computer with a direct monitor
of write printed output
(Pin
28
of J1) or, with no power to the disk drive, disconnect Plug 8, and check the continuity
with an ohmeter.
2.5.2
With a non-write protected diskette
inserted,
verify
that
there
is no continuity
between
the two
(2) wires
of Plug 8 or that there is a
non-write
protected output to the exercisor
or computer,
i.e., a
high at Pin 28 of J1
.
2.5.3
With a write protected diskette inserted, verify that there is continuity
between the two
(2)
wires of Plug
8
or that
there
is
a write-protect
true
output
to
the controller or exercisor (low at
Pin 28 of
J1 ).
Note
A defective circuit board can be responsible for
a write
protect
prob-
lem. Test Point 9 should be high for a write-protected disk
drive, and
low for a non-write protected disk drive.
2.5.4
To adjust the write protect switch, loosen the screw that holds the switch to the
bracket on the side
far-
thest
from the front of the disk drive. Move the switch up or down, as required, to satisfy
the condition of Section
2.5.2 and Section 2.5.3 above (see Figure 2-11).
Figure 2-11
Write Protect Switch Adjustment
2-12
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