Mitsubishi Electric M4853, Руководство по обслуживанию

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7.12
7.13
7.14
7.15
7.16
7.17
7.13
R-3
Installing the "R" jumper in position 3 enables a "held
status" ready output from the drive. The output w i l l
be a logical "0" when a disk is inserted and correctly
clamped in the drive. (Index pulses were detected
correctly.) This ready condition is held even if the
drive is not selected and the motor is not on. It is
an indicator that a disk is inserted in the drive and
the door is c l o s e d . It is r e s e t (to a not r e a d y
state), if the door is opened, which allows the disk to
be ejected.
R-4
This option must not be used.
MC
Cutting this PCB trace causes the spindle motor to cun
whenever a floppy disk is inserted in the drive.
RD-RS
This option is not used at this time.
01
Cutting this PCB trace disables the in-use input to the
drive (Pl-4). This means that the only time the front
p a n e l LED w i l l be lit w i l l be w h e n the d r i v e is
selected. The MX option cannot be used in conjunction
with this modification; the in use LED w i l l never be
illuminated if it is.
Write Protect Inversion
The option pads between IC's Ml and LI are used to
invert the logic of the write protect slot on the
floppy disk. The trace from the center pad to the in­
board pad must be cut, and the center pad must be
jumped to the out-board pad to enable this option.
Input Terminations
All seven input lines to the drive are terminated (see
section 3.1.1). The jumper plug located between IC's
C5 and D5 should be removed on drives in m u l t i - d r i v e
systems, with the exception of the drive the furthest
electrical distance from the controller.