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2
SA-107H
©
"player" position, +B voltage caused at the emitter of Q505 is
prevented from entering the base of 0501 and 0502. With this
prevention, the synchronous control signal goes out of the
player and is applied to the cassette deck, so that both units
are synchronized with each other to perform the record
playing and tape recording at a time.
MUTING
CIRCUIT
Input signal for the SA-107H is muted in the following cases.
1, When the muting switch is turned on:
With the muting switch pushed, +B voitage is applied to the
base of Q907 so that this transistor turns on. With Q907 turned
on, its emitter line is negatively grounded to turn on Q801 and
Q802, so that the signal input line is subjected to the musing.
At the same time, Q904 and Q903 both turn on causing the
muting indicator (PL501) to light up.
2. When
the function
selector switch
is changed
from
one
position to another:
When the function selector switch is changed over, a high
level signal goes out of pin @) of 1C501 through the mute
control circuit inside the IC501.
With this signal given, Q803 and 0804 turn on so that the
muting is effected with the muting indicator lighting up. The
muting lasts about 0.5 second and will stop thereafter.
3. When the power switch is turned on and off:
With the power switch turned on, 0901 and 0902 turn on and
+8 voltage is applied via D905 and D903 to the base of Q803
and Q804 which
causes the muting circuit to operate. As
charging
of C901
is stopped,
Q905
turns on causing the
muting circuit not to operate, With the power switch turned
off, a high level signal is applied to the base of Q906, and with
DIAL
CORD
STRINGING
1. Turn the drum fully clockwise (at the highest frequency
position), and put a hook of the spring in the hole of the
drum.
:
2. Proceed with stringing in the numerical order from () to
®.
3. After the stringing, turn the tuning control knob fully
counterclockwise {at the lowest frequency position),
and align the center of the pointer to notch of the
front bracket.
Met
y
Pulley (Large)
~~~ _
" S s
(33}
"s
Dial cord Assembly (2)
When the fu nction selector switch of the SA-107H is set to the
Dial Pointer
(8)
Pulley (Small)
®
a»
TO POWER
i
AMP. CIRCUIT
boa
el
a
me
+f-) CP
lov
AboB
From Muting Switch | | 382,"
\
aans
Reo
Ta
rn
22k
cade
1/sou
nae Pate
TO
POWER
From
@) pin
of iC501
(High Level}
EE
Figure 10—1
Dial Pointer
_
Setting Point
Indicator PWB
(32)
Tuning Knob
Figure 10—2
—10—
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