6.8.7 POSITIONER
VOICE
COIL POLARITY CHECK
This test will establish that the electrical connections
to
the positioner voice coil
have
the
correct polarity.
6.8.7.1 Test Configuration
(1)
Prepare the positioner as described in Paragraph 6.7.1.
(2)
Connect the Voice Coil Polarity tester
(PERTEC
Part No. 103607) onto connector
J205.
(3)
Maintain the disk drive in the operating mode with the heads loaded onto the disk.
6.8.7.2 Test Procedure
(1)
Manually move the positioner carriage forward toward the spindle in a brisk
manner.
Observe that the
red
indicator
on
the voice coil polarity tester becomes
illuminated.
Also note that the
red
indicator becomes extinguished and remains
extinguished
as
the positioner carriage is moved away from the spindle.
NOTE
It the red indicator
on
the voice
coil
polarity tester remains
extinguished when the positioner carriage is moved
toward the spindle and becomes illuminated when the
positioner carriage is moved away from the spindle,
perform the adjustment procedure in Paragraph
6.8. 7.3.
(2)
Return the carriage to the retracted position.
(3)
Remove power from the disk drive.
(4)
Disconnect the voice coil polarity tester from connector J205.
6.8.7.3 Adjustment Procedure
(1) Reverse the wiring at J205 between pins 1 and 4, and between pins 2
and
5.
(2)
Check operation
by
repeating the test procedure
in
Paragraph 6.8.7.2.
(3)
Perform the Power-Down procedure detailed
in
Paragraph 6.8.8.
6.8.8
POWER-DOWN
PROCEDURE
It is important that the Dynamic Positioner Adjustments detailed in Paragraph 6.9
and
the
Performance Checks detailed
in
Paragraph 6.10
be
performed subsequent to performing
the
Static Positioner Adjustments specified in Paragraph 6.8.
(1) Manually return the positioner carriage to its fully retracted position.
(2)
Place the power
ON
I OFF switch to the OFF position.
(3) Replace the Read/Write PCBA.
(4) Remove the emergency unload connector J128 from the Logic PCBA.
(5)
(200
tpi Only). Remove the jumper between
TP1
on
the Servo PCBA and
TP5
on
the Temperature And Write Compensation PCBA.
(6)
Replace connector J205
and/or
connector J215 on the Servo PCBA.
(7)
Complete the DynamiC Positioner adjustments detailed in Paragraph 6.9.
6-25
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