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)
