Mitsubishi Electric M4853 Maintenance Manual page 28

7.6 MM
This plug is installed to cause the spindle motor to
turn on and rotate the disk with the input of a logical
"0" on the motor on line, Pl-16.
7.7 MS
This plug is installed to cause the spindle motor to
turn on and rotate the disk when the drive is selected
by applying a logical "0" on one of the drive select
lines, DSO through DS3.
7.8 H-l
The "H" jumper is used to select a ready qualifier for
the head load control circuit.
signals are the internal, un-raultiplexed ones that are
always operable, even if the drive is not selected.
Installing the "H" jumper in position 1 routes whatever
type of "ready" signal is selected to be outputed from
the drive to the head load circuit ready qualification
input.
should be installed on the same option (H-2, R-2 or H-
3, R-3) , which is physically impossible.
of H-3, R-3, the R jumper should be installed in the R-
3 position, and the H jumper should be installed in the
H-l position.
7.9 H-2
Installing
"current status" ready signal to the head load circuit
ready qualification input.
7.10 H-3
Installing
"held status" ready signal to the head load circuit
ready qualification input.
7.11 R-2
Installing
"current status"
output goes to a logical "0" when the floppy disk is
rotating at the proper speed and the drive is selected.
This is done when both the H and R jumpers
the "H" jumper
the "H" jumper
the "R" jumper
ready
In this case the ready
in position 2 routes
See section 7.11.
in position 3 routes
See section 7.12.
in position
output for the
In the case
the
the
2 selects a
drive. The