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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
o.
A low enables Head 1. To incorporate this
option, etch cut S2 and install S1.
SI
X
S2
S3
IB
2B
3B
4B
HEAD SELECT
X
Head Select via J1-14.
X
X
Head Select via J 1-26.
X
X
Head Select via J1-28.
X
X
Head Select via J1-30.
X
X
Head Select via J1-32.
Head Select via J1-34.
STEPPER MOTOR POWER
(PS, PS*, DS, HL)
turn off delay of the spindle motor is activated
on the trailing edge of the Motor Control
signal.
NOTE
With Motor Control using Drive Select or
Head Load, the M3 and M4 jumpers determine
which method of Motor Control is enabled. If
option M3 or M4 jumpers are installed, the
Motor On Control, MC1-MC4, options operate
in a logical OR manner with the control
signal(s) selected by the M3 and M4 jumpers.
If the Motor Delay Timer option
(M1) is installed, the five
second turn off delay is in effect
regardless of which M3/M4 con-
figuration is implemented.
M4
MOTOR 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.
X
X
X
X
M3
Ml
X
PS
PS* DS
HL STEPPER POWER
X
Stepper Power
continuously on.
X
X
Stepper Power on with
Drive Select.
X
X
Stepper Power on with
Head Load line J1-18.
SPINDLE MOTOR CONTROL OPTIONS
(M1, M3, M4, MOL, MOH, MC1-MC4)
M1 is used to enable the motor off delay timer.
When this jumper is installed, a five second
When the PS jumper is installed, stepper
motor power is controlled by the Drive Select
line, DS, or the Head Load line, HL. When
either line is true Clow) , the stepper motor is
driven with full power, and is ready for a Seek,
Read, or Write operation. When either line is
false (high),
+
5 volt stand-by current is sup-
plied to the stepper motor to hold the head car-
riage assembly in position. When the PS*
option is in, the stepper motor continuously
receives full power. PS* is diametrically oppo-
site PS (see Figures 3-3 and 3-4).
3-10
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