Akai AA-A35 - Page 11

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electronic potentiometer will be muted, to prevent
the leakage of switching noises to the output circuit.
(The AA-A35/L has no “TUNER” key, but the neces-
sary input selection will be made by command data
from the micro-computer (A1007T) incorporated in
the tuner.)
(2) {TAPE 1], [TAPE 2]
Each single pressing of either key will switch its
monitoring status between ON and OFF from one to
the other, and its indication also turn ON and OFF
accordingly. In addition, during the transfer of serial
data to the analog switch, the electronic potentio-
meter will be muted to prevent the leakage of
switching noises to the output.
This, however, does not apply to TAPE 1 key opera-
tions with TAPE 2 in an ON mode.
(3) [VOLUME]
When the sound volume display is being made, either
fades the sound volume display is being made, either
fades in or fades out to the touched position from an
immediately preceding level. The phasing speed will
be 2dB per 60 msec. However, when the touched
position is above the “Safety” engaged position, the
foregoing operation will be made only up to that
“Safety” position. As for the display, the touched
position (within the “Safety” range) will instantantly
be displayed upon touching.
When either the Balance or the Safety Level is being
displayed, the display will be switched to the
Volume. Operations thereafter will conform with the
above process.
(4) [BALANCE L], [BALANCE R]
When the Balance is being displayed, data will be
transferred to provide the designated level offsets
between Lch and Rch of the electronic potentio-
meter, and the display will also synchronize there-
with. When continuously depressed, however, the
potentiometer setting will start varying at 500 msec
after the depression start, and will thereafter vary at
2dB per 150 msec, but linger for 750 msec at the
center position when passing through it. (The display
will vary at 2 dB per step in the immediate vicinity of
the center position, but at 4 dB per step in all other
areas.)
When these keys are pushed while either the Volume
or the Safety Level is being displayed, the display will
be switched to the Balance.
(5) [SAFETY]
@ When either the Volume or Balance position is
being displayed:
A single press of the key will first have the Safety
Level position at the time displayed. This display
will revert to the Volume position display 5
seconds later, but if the Safety key is depressed
continuously for one second or longer, the display
will be switched to that of the Volume, and the
Safety indicator will flash on and off every second
at a 1/2 duty. This signifies a Safety changing
mode to have been engaged, where any Volume
level up to Max may be selected, and the mode
will be sustained for one ‘minute. In other words,
the one minute after the beginning of the Safety
flashing represents a Safety Level setting time
duration.
@ When the Safety indicator is flashing on and off:
The Volume position touched in this duration will
be set as the Safety Level that represents the
sound volume level not be exceeded by any sub-
sequent acoustic output. As long as the Safety
Level set is other than the maximum potentio-
meter position, the Safety indicator will be lit
steadily, but when it is at the maximum position,
the indicator will go off.
(6) [BASS+], [BASS—] , [TREBLE+] , [TREBLE-]
Each single pressing of one of these keys will either
raise or lower the electronic potentiometer for either
BASS or TREBLE. When it is depressed contin-
uously, the first potentiometer up/down shifting
operation will be performed when 500 msec have
elapsed since the depression start, and the subsequent
operation at the rate of 150 msec per step. When the
shifting passes through the center position, it will
linger there for 750 msec before moving further on.
The display will also vary conforming with individual
key operations.
(7) [DEFEAT]
Restores the BASS/TREBLE positions all at the
center, regardless of their earlier potentiometer posi-
tionings.
(8) [MEMO]
Engages an acoustic pattern storage standby mode.
At this time, the ACOUSTIC MEMO indicator will
turn on, and the Al and A2 indicators flash on and
off for 10 times at a 1/2 duty in l-second cycles
(at 1 Hz).
Even before 5 seconds are up, the standby mode may
be disengaged by pushing any other key than [Al]
and [A2].
(9) [At], [A2]
@ When at Standby for Acoustic Pattern Storage:
Stores the current BASS/TREBLE positions in
the memory, and will disengage the storage
standby mode.
@ When in any other mode than Acoustic Pattern
Storage Standby:
Loads the stored BASS/TREBLE positions, that is,
sets the potentiometers instantly at those positions
and their displays at the same time.
SERVICE MANUAL AA-A35/{L————————————
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