Technics RS-B555

RS-B555
i TERMINAL FUNCTION OF IC’S
e 10901 (MB88511-224N): MICROCOMPUTER (This microcomputer is used for mechanical operation.)
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Division
CD direct operation det. signal
CD direct/LINE input select control signal
(“H”...CD DIRECT, “L”...LINE INPUT)
Line out mute signal (“H”...ON, “L”...OFF)
REC AMP mute signal (““H”...ON, “L”...OFF)
BIAS OSC ON/OFF control signal
(“H”...OFF, “L”...ON)
Dolby NR
mode select
signal
REC LED ON/OFF control signal
(“H”...OFF, “L”...ON)
MPX coil ON/OFF control signal
(“H”...MPX OFF, “L”...MPX ON)
PLAY LED ON/OFF control signal
(“H”...OFF, “L”...ON)
Two head/Three head select signal
(“H”... THREE HEAD, “L”... TWO HEAD)
Power eject motor open control signal
(“H”...OPEN, “L”...CLOSE/STOP)
Tape/Source monitor select control
(“H”... TAPE MONITOR,
“L” SOURCE MONITOR)
Power eject motor close control singnal
(“H”...CLOSE, “L”...OPEN/STOP)
Capstan motor ON/OFF control signal
(“H”...OFF (POWER OFF or ABNORMAL
CONDITION), “L”...ON)
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
Key SW input
(STOP/FF REW/PLAY/REC/PAUSE/
dbx/C/B/MPX/TIMER REC/TIMER PLAY)
Brake solenoid ON/OFF control signal
(“H”...OFF, “L”...ON)
Brake solenoid hold ON/OFF control signal
(“H”...OFF, “L”...ON (FF/REW/MS)
Reel pulse signal
Reel motor reverse control signal
(“H”...REW, “L”...STOP/PLAY/FF) Key SW input (MEMORY REPEAT/MEMORY
STOP/EJECT/MONITOR/CD DIRECT/
OSC/TEST/REMOTE A/B)
Reel motor foward control signal
(“H”...FF/PLAY, “L”...STOP/REW)
Auto Tape Select SW input
Single capstan/Dual capstan select signal {(ATSC/ATSM/EJECT OPEN LEAF SW)
(“H”...DUAL CAPSTAN,
“L”... SINGLE CAPSTAN)
REC INH SW input
(REC INH/EJECT MOTOR LEAF SW)
Calibration OSC circuit ON/OFF control
signal (H”...OFF, “L”...ON) Connected to GND
Serial data signal of FL display
(ACTIVE: “H”)
Clock OSC terminal (6MHz)
Reset signal (““L”... RESET)
Calibration OSC circuit (400 Hz/10kHz) select
signal (“H”...HIGH FREQ. (10kHz),
“L”.. LOW FREQ. (400 Hz)
AC POWER detect signal
Music select det. signal
(“H”...NO SIGNAL, “L”...ON SIGNAL)
MSP
MEMORY
PULSE
Memory Pulse signal
Remote control serial data
(“L” for 50ms. with counter “0000”)
Power supply terminal