Technics RS-B765 - Page 17

RS-B755
Mi TERMINAL FUNCTION OF IC’S
¢ 1C901 (MB88511-224N): MICROCOMPUTER (This microcomputer is used for mechanical operation.)
110 fe)
Division Division
fa | om | oo | Line out mute signal (“H”...ON, “L”...OFF)
DIRECT
fa | aur | oo | REC AMP mute signal (‘‘H”...ON, “L”...OFF)
CD direct operation det. signal
CD direct/LINE input select control signal
(“H”...CD DIRECT, “L”... LINE INPUT)
Dolby B/Dolby C
ao pone | Meoeperepere| a
mode select ret H L L
signal =
B L H L
MPX coil ON/OFF control signal
(“H"...MPX OFF, “L"...MPX ON)
REC LED ON/OFF control signal
(“H”...OFF, “L”...ON)
PLAY LED ON/OFF control signal
(“H"...OFF, “L’...ON)
Power eject motor open control signal
(“H"...OPEN, “L”...CLOSE/STOP)
Two head/Three head select signal
(“H” ... THREE HEAD)
Tape/Source monitor select control
(“H"... TAPE MONITOR,
“L”... SOURCE MONITOR)
Power eject motor close control singnal
(“H”...CLOSE, “L”...OPEN/STOP)
cia
ae
Sc
(REEL PULSE)
Capstan motor ON/OFF control signal
(“H"...OFF (POWER OFF or ABNORMAL
CONDITION), “L”...ON)
BIAS OSC ON/OFF control signal
HALF
(“H”...OFF, “L”...ON)
ARM
Cassette half det. SW terminal (“L”...ON)
Mechanism mode SW terminal
Trigger solenoid ON/OFF control signal
(“H"...OFF, “L”...ON)
Auto Rec Mute key signal (“L”...PUSH)
Connected to GND
Connected to GND
Power supply terminal
Brake solenoid ON/OFF control signal
(“H"...OFF, “L"...ON)
Brake solenoid hold ON/OFF control signal
(“H"...OFF, “L”...ON (FF/REW/MS)
Key SW input
(STOP/FF REW/PLAY/REC/PAUSE/
C/B/MPX/TIMER REC/TIMER PLAY)
Seas
=[ me [=
Reel pulse signal KEY 4 G
Reel motor reverse control signal
(“H”...REW,
“L”...STOP/PLAY/FF)
Key
SW
input
(MEMORY
REPEAT/MEMORY
KEY 2 STOP/EJECT/MONITOR/CD DIRECT/
Reel motor foward control signal OSC/TEST)
(“H".,.FF/PLAY, “L”... STOP/REW) wef
D v
Auto Tape Select SW input
Single capstan/Dual capstan select signal (ATSC/ATSM/EJECT OPEN LEAF SW)
(“H"...DUAL CAPSTAN,
“i”... SINGLE CAPSTAN) REC INH SW Input
(REC INH/EJECT MOTOR LEAF SW)
Connected to GND
Serlal data signal of FL display
(ACTIVE: “H”)
MEMORY
PULSE
REMOCON
Calibration OSC circuit ON/OFF control
signal (“H”...OFF, “L”...ON)
< z
(>)
a
Clock OSC terminal (6MHz)
Music select det. signal
Reset signal (“L”...RESET) (“H”...NO SIGNAL, “L"...ON SIGNAL)
_ =
~“N
Not used in this unit.
Calibration OSC circuit (400 Hz/10kHz)
select signal (“H” ... HIGH FREQ. (10kHz),
“L” ,. LOW FREQ. (400Hz)
AC POWER detect signal
19
OSCF
Memory
Pulse
signal
Not used in this unit.
Remote control serial data
(“L” for 50ms. with counter “0000”)
Power supply terminal
BE