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IBM
978
CARD
COUNTING
UNIT
83
114-3
Figure 65. Counter Magnet Schematic
R113-5N/O provides a circuit from the outer brush
of the commutator to the starting anode of the OA4G
with the counter switch on.
R113-6N/o closes to provide +60 volts to the com-
mon of the emitter used to condition grid 1 of the
counter tubes.
R114 (card lever) is picked when card lever 2
closes and the counter switch is on. It is used
to
condi-
tion the circuits
to
the counter magnets from C13.
R114-1 is not used.
R114-2 and
3N/O
close
to
provide +48 volts from
C13
to
the counter magnet network for as long as
card lever 2 is closed and the counter switch is on.
Rl14-4 is not used.
R115 (tube transfer) is controlled by C 1 0 (190
0
- 284
0)
with the counter switch on. R 115 is used to
transfer digit memory from counter tubes to relays for
digits 2 through 9.
R115-1 is not used.
R115-2 through
9N/O
close at 190
0
to permit
counter tubes to pick corresponding digit memory re-
lays.
Rl15-10 through 12 are not used.
Rl18 (switch) is picked and held in the same man-
ner as RI13 (switch).
Rl18-1 through 12N /
0
close to complete a circuit
from the emitter
to
grid 1 of the corresponding counter
tube.
Duo Relays
R51 (counter switch) is picked and held by the
counter switch in the
ON
position. It is used to condi-
tion machine circuits for counter operation.
R51AU opens to place the motor relay under the
control of 53BU.
R51 AL, in parallel with 51BL, provides a circuit to
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