Audio Unit (X09-5780-11) - Kenwood KAC-X542 Service Manual

AUDIO UNIT (X09-5780-11)

Ref. No
IC1,2 Input isolation amplifier
IC3 Microprocessor
IC4 Microprocessor reset IC
IC6 Current detection circuit voltage amplification
IC8 LX communication LX-CLK, LX-DATA-M comparator
IC9 AMP I2C communication signal level converter
IC10 Switching regulator
Q1 14V power supply for LX communication circuit and AMP communication IC
Q2 VDD 5V AVR
Q7~10 FET drive
Q11~16 DC/DC converter
Q17,26 +15.6V AVR
Q18,27 -15.6V AVR
Q20,21 Switching regulator power switch
Q22,24 VDD 5V AVR
Q25 SW5V
Q30,31 Standby, P-CON
Q41~44 Mute driver
Q50~53 Shock noise prevention
Q54 Mute
Q56,57 Output DC abnormal voltage detection
Q58 Logo LED power supply
Q59 LCD illumination power supply
Q61 Over current detection and protection
Q62~67 Fan operation circuit
Q73,77 BU over voltage detection
Q74,75 FET drive low start switch
Q80~83 LX communication input signal level converter
Q84 LX communication circuit power supply and AMP communication IC1 power switch
Q85,86,90,92~96,98 LX communication output signal level converter
Q91 14V power supply for LX communication circuit and AMP communication IC
Q210 Ach first stage differential amplifier
Q212,311,411,412 Temperature compensation bias
Q301~309,312
Ach first stage differential amplifier
Q314,319,321
Q315~318,415~418 Over current detection and protection
Q320,322,323,325 Ach final current amplifier
Q401~410 Bch first stage differential amplifier
Q423-426 Bch final current amplifier
Q901,902 DC/DC converter
Q905,906,945,946,967 1dB attenuation circuit
COMPONENTS DESCRIPTION
Application / Function
KAC-X542
Operation / Condition / Compatibility
3