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2. Cunent will flow from +B through Rsao, Csoz
and Qs r z. A voltage approximately equal to the
+B voltage (approximately 13V) will be applied
to the pinch solenoid SL r r o r until Qs r z becomes
fully conductive.
3. When Csor becomes fully charged (after an
interval of about 0.5 seconds), Qs r z will be
reduced by Rsar to the minimum value (ap-
proximately 6V) necessary to hold the plunger
in position.
4. If Pin 12 of ICsor goes once again to the L level
during the REW operation of the unit, resulting
from Pin 12 going to the L level, the unit will
go into the PLAY mode as a result of the pro-
gram contained in ICsor.
5. Because of the program contained in ICsor, END
REPEAT is not possible during FF or REW
(Auto stop is possible).
Auto Stop Circuit
This circuit is used to automatically release the
mechanism in the event that the tape stops during
PLAY, REC, FF or REW. It employs a photo-
interrupter type switch linked to the take-up reel
by means of a belt, in order to detect the running
of the tape (Fig. 7-7).
+ 8 3
( 5 6 v )
CT.F9
1. When the tape is running, pulse signals
emitted from the photo-interrupter (TLP
a n d h e n c e Q a o t , Q a o z , Q a o r , Q s o c a n d Q s o r
switch on and off continuously. At the
time, Csor will charge and discharge
While Qsor is turning on and off, the
of point A will be relatively low, and thus
will turn off.
2. When the tape stops running, pulse signals
the photo interrupter lamp will disappear,
thus Qsor will go off.
When this h
Csor will charge up. The potential of po
will start to rise, and Qsoz and Qsor wil
turned on. Consequently, Pin 12 of lCsor
become L level, and the unit will go into
STOP mode.
3. When either the POWER switch is
and off. or the PAUSE button is
H level will be applied to the base of Qsor
D s o s a n d D s o a a n d t h u s t h e p o t e n t i a l a t
will not rise. Consequently, the unit will
go into the STOP mode.
a
+ 9 2
M U Î I N G C I R C U I I
c 5 0 4
R 5 r 4 0 5 0 t
R 5 t 3
Fig. 7 -7
Auto stop circuit
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