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5-6 Initial reset and play circuit
OFF7.5v)
C112
R144
0.022.
ox
ca Sit.ls
i
R=
sig
signal PLAY
a
oTs
at "H", it gives
=
ee
the
auto
mode.
8sz
When tonearm is
oa
lifted up, it in-
hibits the REV
+7.5V
alystsy
operation.
S106
)
Power SW
PLAYO
=|
'$501 (R)
3
REST SW
5
+
'|
PLAY 7.5V
Signal INITIAL RESET is emitted from pin 11 of
1C103 when the power is turned ON @ , when
the power is turned OFF @ or when the cover
is opened
Note: Symbols R and L for switches denotes
respectively the right and left switch ele-
ments on the above circuit diagram.
This circuit is as shown
at the right side of the
broken lines in Fig. 13. This circuit performs the
initial reset at power ON/OFF.
It emits two out-
puts; signal INITIAL
RESET from pin 11 of IC-
103 and signal PLAY from the collector of Q106.
At power ON, when +7.5 V makes pin 12 of IC-
103 into H"
and also pin 11 of 1C103 (signal
INITIAL
RESET)
into "H" by the time constant
of C115 and R141, the circuit gives the auto mode,
the arm
UP and REV indications, and cancels the
FWD
mode,
thus permitting the lead-out opera-
tion. At this time, when the tonearm is at its rest,
Q106 turns OFF and the circuit inhibits the REV
Operation
by the auto mode and arm
UP indica-
tions with signal PLAY at H''.
At power
OFF
during play, since the POWER
switch
is turned OFF to enter the standby mode,
the
lead-out
operation
is performed with signal
INITIAL
RESET at "H" through +7.5 V>C112>
R144>pin 13 of 1C103.
Fig. 13
jetween CL and PR,
riority is given to CL,|
1C105
R132 5.6K
FWD/REV
GATE CONT.
AUTO OUT
When
the cover is opened during play, since the
cover switch is turned OFF and 0105 OFF, PLAY
7.5 V makes pin 11 of 1C103 into 'H" by an "H"'
pulse through R108>R169>C124, thus permitting
the lead-out operation.
When
the
initial
reset
operation
is performed
at power
ON,
Q107
is turned
ON
with
signal
INITIAL RESET at "H", via R132 at the start of
the lead-out operation esp. by the time constant
of C115 and R141. Thereby, signal REV OUT is
not emitted from the REV gate during this time
only.
Sf
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