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22.2
ELECTRONIC CIRCUITS
Logically, the electronic systems for the Model III are the same as for Models I
and II.
Some circuits have been omitted.
that have been omitted.
727 Models I and II
Model HI
75.03
75.04
75.08
They were directly concerned with relays
The changes are as follows:
Change (Omissions on the Model IH Systems)
76.03
AND circuit E32F, which AND'ed T trewind inter
lock statusff with photo-cell output to relay driver
T05J7B to pick tape break relay. Reason for this
om ission is that the tape break relay has been
omitted.
76.04
Cathode follower T04J6F and OR circuit F23F.
These circuits were used to drop L. P. relay
when the unload relay was picked. In the Model
III, the L. P. relay is dropped because "AT L. P ."
ANDfs with "start" on 76. 04.
76.08
Cathode follower T03J8F.
interlock line out to "tape break gate" (page 75.03).
Tape break relay has been omitted.
118
T03J8 powered rewind
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