6300
6.14.6.2 Adjustment Procedure
(100
and
200
tpi)
If
circumferential alignment is required, perform the following procedure.
NOTE
If
the separation between pulses, as measured in Step
(8)
of
Paragraph 6.14.6.1, exceeds 10
,.,sec,
remove
power
from the disk drive and remove the upper two heads.
Check
for
foreign material
or
burrs on the head seating
surfaces. Replace
one
or
both heads
if
a head problem ;s
suspected. Reinstall heads and perform the radial
alignment procedure.
(1)
Maintain setup per Paragraph 6.14.6.1, Steps
(1)
and
(2).
(2)
Insert a Phillips-head screwdriver into the circumferential alignment adjusting
screw located under the cartridge receiver toward the right front
of
the machine
(viewed facing the front
of
the drive).
NOTE
It
may be necessary to
lift
the receiver
slightly
until
the
tool can be inserted.
CAUTION
CARE MUST
BE
TAKEN
WHEN
LIFTING
THE
RECEIVER.
LIFTING
THE
RECEIVER
TOO
HIGH
WILL
CAUSE
THE
SPINNING DISK
TO
COME INTO CONTACT
WITH
THE
CARTRIDGE HOUSING.
NOTE
Rotation
of
the tool in the CCW direction increases the
pulse delay from Index.
(3)
Select either head 0 or 1 and, while observing the waveform at
TP19,
turn the
adjusting screw until the first pulse after the
falling edge of Index (Channel
2)
falls
within the
30
± 5
J.tsec
specification.
(4)
Select the other head and ensure that the specification detailed in Step
(3)
is met.
A compromise adjustment
may
be
required to meet the
30
± 5
J.tsec
requirement
for both heads.
See
Figure
6-29.
(5)
Turn the Phillips-head screwdriver slightly in the opposite direction
of
the last turn
to cause the adjusting screw
to
relax the force on the mechanism
(Le.,
mid-range
of
the screw backlash).
(6)
Recheck heads 0 and 1 to verify that the measurement is still within tolerance.
Repeat
Steps
(3),
(4),
and
(5)
as
necessary.
(7)
Remove the Phillips-head screwdriver and bring the disk drive to the SAFE
condition, then remove the
CE
disk cartridge. Return the disk drive to its former
configuration.
Do
not forget to reset the write protect switch
if
the protect is not
desi red, and reconnect
P206
on the Servo PCBA.
6-62
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