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5.
Power is applied to J3-c and J3-d for application at the remote control
position, if required.
6.
The fan is normally connected across TBl-4 and TB 1-6 where it is
operated only when the capstan motor is running.
By removing the
fan lead on TB 1-4 and connecting it to TB 1- 5, the fan will run whenever
the power switch is on.
Threaded Tape Condition
When a reel of tape is placed on the supply hub, the free end is passed
through the incoming side of the Isoloop, past the capstan and record head, and
around the reversing idler, then between the outgoing side of the capstan and its
idler.
When the tape is dropped into position at this point, light is cut off from
V60 causing relay Kl to release.
CR-l is a surge protective diQde.
When Kl contacts 11 and 7 open, the head shield cover is closed because the
door solenoid is released and the remote TAPE
~UNOUT
lamp goes out.
Closure of K 1 contacts 11 and 3, and 12 and 4 applies bus potential through
K7 contacts 11 and 3, K6 contacts 12 and 4, K8 contacts 11 and 3, and K5 contacts
12 and 4 through J5-14 to light STOP lamp DS3; and a path through CR13 and R5
charges C3, and operates K4.
Several other paths are likewise made ready.
Opening of Kl contacts 10 and 6 inserts R9 in the return path of the reel motor
fields and the voltage developed across this resistor is applied through K5 contacts
land 9, K6 contacts 1 and 9, K7 contacts 1 and 9 through J6-A to the armature
of the rewind motor.
A similar path applies the same voltage to the takeup motor
through K5 contacts 2 and 10, K6 contacts 2 and 10, K7 contacts 2 and 10, and J6-2.
The torque so generated is very small; sufficient to remove slack from threaded
tape but not enough to cause motion of the tape from a large-diameter reel to a
smaller one.
When the end of the tape is threaded into the takeup reel, the transport
is ready to be put into motion from its standby condition.
From Standltill to Play
Bus potential exists on switch S5 through J6-D, J2-9, and J2-10.
Closure
of the PLA Y pushbutton applies this through J6 -18 and CR4 to operate relay K3
momentarily.
Through K7 contacts 11 and 3, K6 contacts 12 and 4, K8 contacts
11 and 3, and K3 contacts 8 and 12, K5 is caused to operate.
Release of the PLA Y
pushbutton releases K3 but K5 remains locked up through K5 contacts 8 and 12, K8
contacts 3 and
II,
etc.
PLA
Y
lamp DS5 remains lit through J6-17 since
it
is in
parallel with the coil of K5.
This same supply immediately operates the ingoing
capstan idler solenoid through TB2-I, clamping the tape gently, under control of a
dashpot, to the capstan.
The break at K5 contacts 12 and 4 removes bus voltage
from C3 and the coil of K4 so that after approximately 0.5 second, K4 releases.
M64 PAR 2-71
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77
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