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Channel pressetting mode
In this model there are three band selector keys,
VHF I, VHF Ill and UHF, each with ** mark given in
the key matrix 2, and pushing either of them provides
the channel presetting mode in which one can preset
the desired channel of each band into the memory by
operating
the
channel
selector
keys
(CHANNEL
UP/DOWN keys).
With the band selector key turned on, a tuning voltage
is caused and its value has been set by the tuning
control in advance: the tuning voltage will vary at the
speed of 4.47V/100 msec (30mV step) and be settled
at that previously set value. Thereafter, if the tuning
control is moved, the tuning voltage will vary at the
speed of 2.1V/sec (4mV step) and be settled at the
value available with this motion.
Instantly when the band selector key is pushed, AFT
muting turns off and the channel No. indicator (with
segment output display) flashes at the intervals of
about 3.3 Hz.
While the unit is in the channel presetting mode, when
the channel selector keys are operated, the information
data relevant to the selected channel is read out of the
EAROM
in the microcomputer, so that the channel
No. indicator lights up to show what channel is now
being tuned in.
Then if the memory key is pushed during the channel
presetting mode, the information data (tuning voltage,
band, channel no., AFT on/off) concerned with the
channel being in selection are written into the corres-
ponding address at the EAROM: as to AFT data, the
information of AFT on is written in the EAROM.
With the memory key pushed, the channel No. indi-
cator stops flashing for about 1 second and then it
starts flashing again.
@ How to preset the channels:
your desired channel position.
(b) Operate the band selector key to obtain your
Channel selection
AFT control
(4
—
(5)
C-1408T
MUTE
|
!
Picture
pL.
Last channel —_
Channel data tomatoe
contrast
|
data writing
reading-out
\
as
ast |
re
™ About
= |
;
1
250 msec
Key entry start
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I
I
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t
1
Processing of remote control signal
Last channel memory function
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