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(7)
Open Cable Detect
This signal is used to prevent damage of data caused by interface
disturbances when the power to the controller is lost.
Therefore, this
signal must be stable when the controller is available, and must be
disabled before logic levels decay on the interface when a power failure
occurs in the controller.
Refer to Figure 4.5.20.
(8)
Tag 4 and 5
Unit Status, Sector Status, Write/Read Check Status and Access Status can
be sensed throughout Status 0
~
7 lines with a combination of those two
coded signals.
Status 0 to
4
for Unit Status are always displayed by 5
LEDs and Status 0 to 7 for DE Sequence State, Write/Read Check State and
Access State are also displayed by 7-segment LEDs on the PCB
(B17B-0270-0010A#U) for maintenance aid.
See Table 4.5.2 for information about these Tags.
Note that Unit Status can always be on the interface by shorting a circuit
on the Logic PCB (C16B-5)27-0290#U) with a shorting plug.
See Figure
4.5.21 for time specifications.
(9)
Power Sequence Pick/Hold
Power Sequence is required when the Remote/Local switch on the display
panel PCB (B17B-0270-0010A#U) is set to Remote.
In this mode, when the
controller sets the Pick and Hold lines to ground, the first drive's
spindle starts rotating if the start switch has been pressed.
Approximately five seconds later the Pick signal is sequenced up.
When
both signals go false, the spindle stops rotating.
If the mode switch on
the display panel PCB is set to Local, each Start Switch must be pressed
manually to start the spindle rotating.
Refer to Figure 4.5.22.
B03P-4825-0002A ... OIA
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Table of Contents
Troubleshooting
