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continues to hold or to transfer to K6 is determined by the direction the tape is
moving as outlined above.
In any event, operation of KS functions to bring the tape
to standby condition.
When K6 or K7 is released by the sense switch as the tape
reaches standstill and attempts to reverse, the break at K6 contacts 7 and 11 or K7
contacts Sand 12 releases KS.
Normally, the machine would now remain in standby,
but at this time K3 is still operated even though its supply path through K3 contacts
7 and 11 is open.
This is because it is held by the charge in C 1 for sufficient time
to perform an additional function.
When KS releases, bus power is supplied through
K7 contacts 11 and 3, K6 contacts 12 and 4, KS contacts 11 and 3, and K3 contacts
Sand 12 to operate K5.
The functions from here on are as described under "From
5tandstill to Play. "
From Forward to
'
P lay
In the fast-forward mode, regardless of actual direction of tape motion,
relay K6 andK4 is energized. Pressing PLAY pushbutton 55 causes bus power to
flow through 16-D, 12-9, 12-10, 55, 16-1S, and CR4 to operate K3.
A holding
path is established for K3 through K6 contacts 11 and 7, K3 contacts 11 and 7, Rl,
CRS, and CR7 so that K3 will not release when 55 is released.
Relay K3 opens the
paths to 53, 52, and 54 pushbuttons to render them inactive at this time.
The
potential from K7 contacts 12 and S through K3 contacts 11 and 7 and Rl also feeds
through CR9 to terminal 14 of KS causing it to operate.
Because this action opens
the holding path for K6 through K8 contacts 9 and 1 and K6contacts Sand 12, an
unstable condition could arise but is prevented by the charge in C12, which
continues to hold KS until the transfer of K6 is completed, if need be.
Whether K6
continues to hold or to transfer to K7 is determined by the direction of tape move
ment.
In any event, operation of KS functions to bring the machine to a standby
condition.
When K6 or K7 is released by the sense switch as the tape reaches
standstill and attempts to reverse direction, the break at K6 contacts 7 and II, or
K7 contacts 8 and 12, releases KS.
Normally, the machine would now remain in
standby but at this time K3 is still energized even though its supply path through
K3 contacts 7 and 11 is open.
This is because it is held by the charge in C 1 for
sufficient time to perform an additional function.
When K8 releases, bus power is
supplied through K7 contacts 11 and 3, K6 contacts 12 and 4, K8 contacts 11 and 3,
and K3 contacts 8 and 12 to
~nergize
K5.
Tape Runout
W hen the tape runs out from a ny mode of opera tion, the light from lamp D5S
falls upon photo diode V60, causing Kl to energize.
This action opens the bus supply
to all other relays.
All power is therefore removed from the armatures of the take
up and rewind motors.
A short circuit is applied to the armature of each motor
.
One such circuit is through 19-4, 16-5, KI contacts 10 and 6, 16-4, 12-1, 12-2,
15-P, K5 contacts 2 and 10. K6 contacts 2 and 10, K 7 contacts 2 and 10. J6-2 and
19-3
.
The other circuit is through 17-4, 16-5, Kl contacts 10 and 6. 16-4. 12-1,
12-3, 15-V. K5 contacts I and 9, K6 contacts I and 9, K7 contacts 1 and 9. 16-A,
and 17-3.
5ince the fields are fully excited, this system acts to brake the motors
to a standstill since they operate as dc generators operating into a short circuit
.
S2
M64 PAR 2-71
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