Technics RS-B555

ater stotele)
3. Operation of the mechanism control circuit
The mechanism and the entire deck are controlled by system control
microcomputer IC-901 (MB88511). The signals from the key switches
on the front panel are all input via key 1 and key 2.
The key input is detected by voltage detection of 256 division of
5 volts.
The trigger solenoid and the brake solenoid are controlled by the
ON/OFF switching of transistors, and the CSOL signal is for the
holding of the brake solenoid.
The take-up reel pulse and the supply reel pulse are supplied to
fluorescent
display
IC-551
to
become
the
input
signals
for
the
real
time
display
(Model
RS-B555
is
not
equipped
with
this
function).
Mechanism Control Circuit
Metal
_
>
e
cea
[ante
Tape
REC
Inhibit
SW
lod
>
Cr0?
Select
Display Data Out Key Input
Music
Select
Rey
taper
Auto
REC
Mut
u ute
Memory
Pules
39|38|
36/35|34133
5
Megan
eH
Oo—Cassette Half Sw
MPX Filter ON/OFF
Line Out Muting
REC Mute
Bias ON/OFF
Capstan DD Motor
Key Input
Baa Cl ea aad aaa
tat : “9
$709
S701 5703
$702 $704
Key input is done by
detecting voltage of Trigger Brake
+5 volts divided by Solenoid Solenoid
256 steps.
Reel Motor
Take-up
Reel Pules
For Real Time Indication