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2.3.6 Fault Detection
~lock Diagram - :~.'
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DC POWER
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t
tinier/ace
I
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I
OMPARATOR
MICROPROCESSOR
HEAD SELECT COMPARATOR
RESET
tlnlerface
I
READ/WRITE
LSI
WRITE FAULT
tiC 6HJ
tinier/ace
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SEEK COMPLETE
READY
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Iinierfacel
Functional Description -
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Any combination'of
the following
events will cause a
Write Fault condition and will prevent the drive from
writing:
1. Multiple heads selected
2. DC voltages greater than 29% low
3. Seek Complete
or Ready inactive when Write Gate is
active
Voltage and Bead Comparator Select
The Read/Write LSI (IC 6H) constantly monitors both the
+5 and +12 Volt lines to detect a low-voltage condition.
If +5 Volts is >15% low or +12 Volts is >20% low, the
DC-unsafe
signal
is activated
(IC 6H,pin 25) causing
write current to be disabled, the microprocessor reset,
the fault line activated
(IC 6H, pin 24) and the heads
deselected.
If multiple heads are selected the Read/Write LSI will
disable the write circuitry and send a write fault to
the interface (IC 6H, pin 24)•
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