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HEAD SELECT USING DIRECTION SELECT
During a Read or Write operation, the state of the Direction Select line is undefined. Hence, it may be
used to select the desired head. A high enables Head 0. A low enables Head 1. To incorporate this
o ption, etch cut S2 and install Sl .
S1
S2
X
X
STEPPER MOTOR POWER
(PS, PS*, DS, HL)
When t h e
P S j u m p e r i s i n s t a l l ed, s t epper
motor power is controlled by the Dr iv e Select
l ine, DS, or t h e H e a d L oa d l i n e , H L . W h e n
either line is t r u e (l ow), the stepper motor i s
driven with full power, and is ready for a Seek,
Read, or Writ e operation. When either l in e is
false (high), + 5 v ol t s t a nd-by current is sup-
plied to the stepper motor to hold the head car-
r iage assembly i n
p o s i t i on . W h e n t h e P S *
option is i n , t h e s t epper m otor cont i nuously
receives full power. PS* is diametrically oppo-
site PS (see Figures 3-3 and 3-4).
PS PS~ D S
HL STE P PER POWER
X
-
X
X
-
X
X
-
SPINDLE MOTOR CONTROL OPTIONS
(M1, M3, M4, MOL, MOH, MG1 — MG4)
Ml is used to enable the motor off delay timer.
When this j u m per i s i n s t a l led, a f i v e second
S3
1B
2B
X
X X
X
X X
Stepper Power
continuously on.
Stepper Power on with
Drive Select.
Stepper Power on with
Head Load line J1-18.
3B
4B
turn off delay of the spindle motor is activated
o n th e
t r a i l i n g e d g e o f t h e M o t o r C o n t r o l
signal.
W ith
M o t o r C o n t r o l u s i n g D r i v e S e l ect o r
Head Load, the M3 and M4 jumpers determine
which method of M otor Control is enabled. If
o ption M 3 o r M 4 j u m p er s ar e i n s t a l l ed, t h e
Motor On Control, MC1 — MC4, options operate
i n a
l o g i ca l O R m a n n e r w i t h t he c o n t r o l
signal(s) selected by the M3 and M4 jumpers.
If the Motor Delay Timer option
(M1)
i s i n st a l l e d , t h e f iv e
second turn off delay is in effect
regardless of which M3/M 4 con-
figuration is implemented.
M1
M3
M4
X
X
X
X
3-10
HEAD SELECT
Head Select via J1-14.
Head Select via J1-26.
Head Select via J1-28.
Head Select via J1-30.
Head Select via J1-32.
Head Select via J1-34.
NOTE
MOTO R CONTROL
Enables five-second
motor off delay timer.
Motor Control only
with MC1 — M4 options.
Motor Control using
Drive Select.
Motor Control using
Head Load.
Motor Control using
Drive Select and Head
Load, logical AND.
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