Sanyo M9998LU - Page 4

AMSS: HOW DOES IT WORK?
AMSS stands for Automatic Music Select System, and it is
intended to search for the start of a desired music auto-
matically by making use of the unrecorded (no-signal)
segment between recorded tunes in a pre-recorded music
tape.
Method of use
A.
In playback mode, to skip the tuner being reproduced
and play back the next tune:
(1) Press AMSS button. (The button is locked.)
(2) Press FF-Cue/AMSS button. (This button is
locked to fast-forward the tape. At this time
AMSS indicator flickers to tell the tape running
direction.)
(3) Reaching the end of the tune being reproduced,
the FF-Cue/AMSS button only is reset auto-
matically, and the playback of the next tune is
started after running through the unrecorded
segment.
In playback mode, to repeat the tune being reproduc-
ed:
(1) Press AMSS button. (The button is locked.)
(2) Press REW-Review/AMSS button. (This button is
locked to rewind the tape. At this time, the other
AMSS indication flickers to tell the tape running
direction.)
(3) Returning to the start of the tune being reproduc-
ed, the REW-Review/AMSS button only is reset
automatically, and the playback of the same
tune is repeated immediately.
In playback mode, to skip several tunes to search for
a desired one:
(1) Manipulate as in A-(1).
(2) Manipulate as in A-(2) and A-(3) repeatedly until
the desired tune is located.
R745 10K
R746 220K
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$632 (REW)
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C717 2.2/25V
0726 15188 AM R726 56
R752 3.3K
Q712
2S C536F
AMSS'ON" iTEM"C’ POSITION
ITEM'S! POSITION / ITEM"A'@'C” POSITION /
RECORDED LEVEL ---- : /
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MUSIC 4 MUSIC MUSIC
NON-RECORD LEVEL ---------- ; tL
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Circuit description
Main behavior
Playback signals from the head are detected in the level
detector circuit. When unrecorded level is found, a single
shot pulse is generated to operate the plunger.
Briefing on circuits
(1)
(2)
Pressing of play button will cause switch S611 to
turn on.
Pressing of AMSS button will cause switch S601 to
close.
When FF-Cue/AMSS or REW-Review/AMSS button
is pressed, switch S623 or S633 will close.
Then, voltage Vcc is supplied into circuits.
Transistors Q703, Q704 are astable multivibrator
circuits; when switch S623 or S633 is closed, the
power is supplied, and the circuit is activated to be
in oscillating state, while either LED (D705 or D706)
of tape running direction indicator flickers according
to the switch operation. Diodes D707, D708 are
intended to prevent over-current.
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POWER SUPPLY
4.7K _0S442 R770 D724
C7i9 4.7 /10V ¢
Q713 Q708
2SC536 2S0612E