KENWOOD KRC4902Y
Service Manual

KRC-4902Y
COMPONENTS DESCRIPTION
q SYNTHESIZER UNIT (X14-6892-72)
Ref.No.
IC1 IC2 IC4 IC7 IC8 IC9 IC10 IC11 IC12 Q1 Q10 Q11 Q20 Q40 Q50 Q101 Q151

Function
SYSTEM µ-COM E-VOLUME POWER AMPLIFIER POWER IC MUTE CONTROL LOGIC EQUALIZER AMPLIFIER SUB MOTOR DRIVER RESET IC EEPROM P.CON.DETECTION BACK-UP DETECTION SERGE DETECTION ACC DETECTION PREOUT MUTE DRIVER 5V SW DSI SW PANEL 5V SW Detects P.CON voltage. Detects the back-up voltage. Detects serge voltage. Detects ACC voltage. 3 input NOR gate x 3 For full logical cassette mechanism control Speaker output

Operation

For full logical cassette mechanism sub motor driver Detection voltage below 3.0V

Mutes when the base terminal voltage level becomes "L". Works when the base terminal voltage level becomes "L". LED for DSI works when the base terminal voltage level becomes "H". Works when the base terminal voltage level becomes "L". Supplies VDD to panel. Mutes when the base terminal voltage level becomes "H". Discharges the capacitor's voltage of SVR terminal after the base terminal voltage becomes "H". Changes to the local seeking after the base terminal voltage becomes "H". Works when the base terminal voltage becomes "H". Supplies the power to the motor driver. Works when the base terminal voltage becomes "L". Works when the base terminal voltage becomes "H".

Q221-224 PREOUT MUTE Q251 Q301 Q501 Q551 Q552 POWER IC SVR SW LOCAL SEEK SW MOTOR DRIVER AVR MAIN MOTOR SW MAIN MOTOR SW

q SWITCH UNIT (X16-1532-71)
Ref.No.
IC1 IC2 Q1 Q2 Q3

Function
LCD DRIVER REMOTE SENSOR KEY SCAN SW KEY ILLUMINATION SW KEY ILLUMINATION SW

Operation

Receives key signal when the base terminal voltage becomes "L". Key illumination color becomes green when the base terminal voltage becomes "H". Key illumination color becomes red when the base terminal voltage becomes "H".

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