Fujitsu M2361A Customer Engineering Manual page 58

(3) DE sequence state
(ST 2)
a. DE Sequence Latch 1, 2 and 4
Indicates start/stop status of the DE. Details are described in
subsection 4.5.4, Table 4.5.4.
b. Hall Alarm
Indicates that all output signals from the hall-elements used to
detect the pole position of the rotor in the spindle motor are high
or low level simultaneously.
c. Motor At Speed
Indicates that the spindle motor is rotating at 3,600 RPM ±2%.
d. Inhibit DE Sequence Recycle
Indicates that Run State Good goes false while the DE Sequence Latch
is in State 7. Stop sequence of the DE may be inhibited hereafter.
Switching off the drive power or pushing the Start switch to Off
position clears this state.
e. Unit Ready
Indicates that the drive has reached the rated rotational speed and
heads are positioned on track.
f. Access Busy
Indicates that the heads are in motion, i.e., heads are performing
Seek, RTZ or Offset operation.
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