Components Description - Kenwood KRC-31Y Service Manual

SYNTHESIZER UNIT (X14-689x-xx)
Ref. No. Function
System µ-com
IC1
IC2 E-volume
IC4 Power amplifier
IC6 RDS decoder
IC7 Power IC
IC8 Mute control logic
IC9 Equalizer amplifier
IC10 Sub motor driver
IC11 Reset IC
IC12 EEPROM
Q1 P. CON detection
Q10 Backup detection
Q11 Surge detection
Q20 ACC detection
Q40 Preout mute driver
Q50 5V SW
Q101 DSI SW
Q151 Panel 5V SW
Q201 Noise detection
Q221~224 Preout mute
Q251 Power IC SVR SW
Q301 Local seek SW
Q501 Motor driver AVR
Q551 Main motor SW
Q552 Main motor SW
SWITCH UNIT (X16-1532-7x)
Ref. No. Function
IC1 LCD driver
IC2 Remote sensor
Q1 Key scan SW
Q2 Key illumination SW
Q3 Key illumination SW

COMPONENTS DESCRIPTION

Speaker output.
3 input NOR gate x 3.
For full logical cassette mechanism control.
For full logical cassette mechanism sub motor driver.
Detection voltage below 3.0V.
Detects P.CON voltage.
Detects the backup voltage.
Detects surge voltage.
Detects ACC voltage.
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.
Detects noise.
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".
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".
KRC-31Y/36/366L/37/Y
/391/394/Y/466R/4904Y
Operation
Operation
3