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4. CIRCUIT DESCRIPTIONS
4.1 CONTROL PART
This model carries out all of its controls by the use
of a microcomputer (IC 501). Modes and progtams
are selected by the key input supplied into the key
matrix circuit (Fig. 4-4), while the microcomputer
controls various sections such as mechanism drive,
circuit switch'over, and mute control circuits by
feeding command outputs into those circuits' The
display circuit is provided to indicate the music
program being selected and REC, DOLBY NR, etc'
being turned on or off.
O POWER ON
When the machine is turned on, the built-in micro-
computer is initiatized (Fig. 4-1) and is ready to re'
ceive inPut sent from the keY.
Wslt for mlcro-
c o m p u t € r l C S O t
to 3t6blli26
Chæk to s€ lf decks A and B ar€ in th€ STOP mod€
(thst
15. when th€ hoad bts. is lN)
ll thev âro not in ths STOP
mod€, low€r th€ hoâd b63e to put thsm in tho STOP mode
Th61 th€ ba.e is low i3 depctêd bv MODE switchôs S3Ot
(for m€chêôi9m on dack A) rnd S4O2 (lo. mschanlsm on
deck B) (Th€ swilch€3 6t€ ofl during the STOP mod€.)
Check 6nd 51or€ the TIMER
RÊC k€Y stôtus in the
RAM is clôot€d
Input and outPUl
ports are sel
limor
d6ta la set
K E Y S C A N
S t a t u 3 o l l l M É R
REC koY i3 sto.6d In
thâ m9mory
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