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946261·9701
SECTION 4
OPERATION
4.1 GENERAL
This section describes the controls and indicators that are available to the operator for placing
and keeping the Model DS 1 0 Cartridge Disk System in a normal operating configuration.
4.2 CONTROLS AND INDICATORS
Figure 4-1 illustrates the locations of the controls and indicators on the disk drive. The following
paragraphs describe the operations of those controls and indicators.
4.2.1 AC CIRCUIT BREAKER. The ac circuit breaker (labeled MAIN) located on the rear of
the disk drive protects the disk drive power supply, spindle motor, and fan motor from damage
due to overload conditions and provides main power
swit~hing
for the disk drive. Normally, the
circuit breaker is set to ON during installation and checkout of the disk drive, then left on for
normal operation.
4.2.2 DC CIRCUIT BREAKER. The dc circuit breaker (labeled 34 VOLTS) located on the rear of
the disk drive provides the logic circuitry with protection from overload due to circuit malfunctions.
Normally, the breaker is set during installation and checkout of the disk drive, and left on for nor-
mal operations.
4.2.3 START/STOP SWITCH/INDICATOR. The START/STOP switch/indicator is an alternate
action switch with a lighted pushbutton. If the indicator is not lighted and is operational,
pressing the switch energizes the spindle motor and initiates the first seek mode, provided the
following conditions exist:
•
Circuit breakers closed
•
Disk cartridge dust cover properly installed
•
Cartridge hold-down arms properly positioned.
When the spindle motor is energized, the START/STOP indicator is lighted and remains lighted
until the spindle motor stops in response to START/STOP switch operation.
Pressing the START/STOP switch while the indicator is lighted (spindle motor energized)
de-energizes the spindle motor.
When the START/STOP switch is pressed to de-engerize the spindle motor, the indicator remains
lighted until the disk rotation has stopped and the interlock solenoids energize to release the disk
cartridge.
NOTE
The first seek mode is automatic and requires approximately
65 seconds. The disk drive can be reset at any time after initiation
of the start sequence. In the event of a potentially damaging fault
during the first seek mode, the heads automatically retract and the
disk drive stops.
4-1
Digital Systems Division
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