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/ KRC-949D
CIRCUIT DESCRIPTION
SYNTHESIZER UNIT (X14-2002-70)
Application/function
Mechanism control, hybrid
Component
Operation/condition/compatibility
ici
1C2
Mechanism control microprocessor (slave)
ICc3
Exclusive OR
1c4
Comparator
Reel pulse to interruption pulse.
Reel pulse waveform shaper.
Mechanism control microprocessor (master)
IC6
BCD to binary
{C7
TAPE display digit driver
IC8
}
TAPE display segment driver
Ic9
Inverter/monostaqle multi-vibrator
Synthesizer microprocessor
Pulse swallow counter, pre-scaler
TUNER display segment driver
TUNER display digit driver
Qi
Main motor control
PLAY ON.
EJECT ON.
PLAY ON.
EJECT ON,
PLAY ON.
EJECT ON.
Q2
Main motor control
Q3
PLAY/EJECT switch
Q4
PLAY/EJECT switch
Q5
PLAY/EJECT switch
a6
PLAY/EJECT switch
Q7
AVR for EQ (equalizer)
Q8
Mechanism microprocessor, T.ADV input driver
zh Ear
ag
Dolby B/C switch
C: ON.
Q10
Dolby ON/OFF switch
Dolby ON : ON.
ait
EQ (equalizer) select
Q15
Reset switch
Q19
TAPE/TUNER control
Q
TAPE/TUNER select
TUNER : ON.
TAPE/TUNER select
TAPE : ON
TUNER ON when CD mode
Turns ON when CD in.
TUNER
power drive
OFF when TUNER
mode.
CD control switch
ACC control switch
dbx control, DC level shift
Mechanism control, hybrid IC power switch
Turns OFF 3 seconds after ACC OFF.
Main motor power switch
ACC control
Mechanism power switch
Eject switch
Microprocessor AVR
Mechanism control hybrid [(C AVR
ACC detect
SKO prohibition when Power ON
Sh', Si' display prohibition when Power ON
Relay driver, DC level shift
FM + B switch driver
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