KRC-309S/389/389W,409/479,489/489G
3
COMPONENT DESCRIPTION
REF FUNCTION OPERATION
No.
IC1 SYSTEM µ-COM Controls FM/AM tuner, the changer, cassette mechanism,
volume and tone.
IC2 E-VOLUME Controls the source, volume, tone and FM multiplex detector.
IC4 POWER AMPLIFIER Amplifies the front L/R and the rear L/R to 45W maximum.
IC5 EQUALIZER AMPLIFIER Equalizes the tape sound (120uSec.).
IC6 SUB MOTOR DRIVER Controls the sub motor.
IC7 AVR B.U.:5V, AUD:8V, FM+B:8V, AM+B:8V
IC10 MUTE CONTROL LOGIC Controls logic.
Output becomes "L" when the back-up voltage becomes more than 9V.
Q10 BACK-UP DETECTION Output becomes "H" when the back-up voltage becomes less than 9V
(momentary power down).
Output becomes "L" when the back-up voltage becomes more then 18V
Q11 SERGE DETECTION (Momentary power down). Output becomes "H" when the back-up
voltage becomes less than 18V.
Q41 PRE MUTE DRIVER When input becomes "L", output becomes "H" (Preout mute).
Q50 5V SW Outputs 5V to the SW5V power supply when input becomes "L".
SW5V power supply line is cut off when the input becomes "H".
Q51 POWER ANTENNA Output becomes "H" when P-ANT output is short-circuited (P-ANT OFF).
DETECTION Output becomes "L" when FM/AM signal does not exist.
Q52 P.CON. DETECTION Output becomes "H" when P.CON output is short-circuited (P.CON OFF).
Q190 PANEL SW Outputs 5V to the panel VDD line when panel is attached.
Panel VDD line is cut off when panel is taken out.
Q191 DSI DRIVER DSI lights when input becomes "L". DSI turns off when input becomes
"H".DSI turns on and off when panel is taken off.
Q221-224 PRE MUTE Works when input becomes "H". Being cancelled when input
becomes "L".
Q251 SVR "L" when input becomes "H".
Q501 SUB MOTOR AVR Outputs 7.3V when AUD8V exists. Output does not exist when AUD8V
does not exist.
Q551 MAIN MOTOR SW Outputs 14V when input becomes "L" (Main motor drives).
Q552 MAIN MOTOR SW Output becomes "H" when input becomes "L".
REF. FUNCTION OPERATION
No.
IC1 LCD DRIVER Scans LCD display control key.
IC2 REMOTE SENSOR Sensors remote controller signal.
Q1 KEY SCAN SW Scans key after receiving imitative key input signal.
SYNTHESIZER UNIT (X14-639x-xx)
SWITCH UNIT (X13-986x-xx)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
