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3-70
RESULTANT OF
POS
AND
NEG 0181TS
POSITIVE
OI
B I T S -
AMPUTUDE
POsmvt
Dl81T
NEGATIVE
"
01
81TS -----~/.'
I
AMPt.JTUDE
I
,
~'
I
TRACK
SERW------'
I
SGNAL
:
CYUNOER
DETECT A
(A30031
CYt.JNOER
DETECT
8
(A3002)
I
I
I
,
NEGAT1V£
DI8IT
___ r
CYUNOER
PUt.SES
'2'''' ---..
-- - ...---,
,---.f
_ _ _
~=.,,'
~
l:--.....l
-
TRACK
0
TRACK
I
TRACK
2
REVERSE END - - - ,
Of
TRAVEl..
' .... - - - - - - - - - - - - . . ,
FORWARD
END
OF
TRAVEL
f
~
DISK
~ MOTION
\
fORWARD GUARD
\
"
BANOS
AREA
,- !\,'
~
#
,,'\
I
I
I
,
l----t"-_ _ _ _
r---Il--
TRACK 822
--J
APPROX 4-
81-
- ,
TRACKS
I
'-----_
....
,
NOTES:
<D
TRACK SERVO SIGNAL.
(A2!50~)
IS 180· OUT-Of-PHASE WITH THIS WAVEFORM.
@)
CYL
PUL.SE DOES NOT AFFECT DIFFERENCE COUNTER AT TRACK 0 FOR FIRST SEEK.
Figure 3-31.
Cylinder Pulses Generation
Sl.0P(Qf'
NEG 0I81TS
7M90
83318200
A
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