Direction Switch; Step Control Switch - IBM 2310 Maintenance Manual

Electronic
Gate
SW5 SW6
10 MIL
SW7 SW8
OUT CONT
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I
0 20 MIL IN
I
Head Select Step Mode Direction
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Figure 2-1. CE Panel and Switches
the carriage for each step of the actuator. The
switch has two positions, labeled 10 MIL and 20 MIL,
which correspond with the distance to be displaced
by the carriage (10 or 20 milli-inches) each time
the Step Control switch is actuated.
2.4.3 Direction Switch
The Direction switch controls the direction of car-
riage motion by causing the carriage to move in a
forward or reverse direction while it is being actu-
ated. The switch has two positions labeled IN and
OUT. The In position causes the carriage to move
forward toward the center of the data disk when the
Step Control switch is actuated. The Out position
causes the carriage to move, in
r~verse,
away from
center of the data disk each time the Step Control
switch is actuated.
2.2
FRONT
Base Plate
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~/
:~
CE Panel
& Switches
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2.4.4 Step Control Switch
The Step Control switch initiates carriage motion by
providing an access drive pulse to access circuits to
effect movement of the carriage. This switch has
three positions; continuous step, single step, and
neutral. Labeling on the switch, CaNT and SING,
correspond with the continuous or single stepping
movement.
When the switch is positioned for a continuous
step movement, the actuator is caused to step con-
tinuously at a 15 ms rate in a forward or reverse
direction as determined by the position of the Direc-
tion switch. The actuator steps in increments of 10
or 20 milli -inch steps as determined by the position
of the Step Mode switch. The actuator continues this
stepping cycle until the carriage strikes the mechani-
cal limits of travel where the detent continues to