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KCA-S220A
CHANGER 1
Lch
Rch
HCLK
DATAH
DATAC
REQC
CH RST
REQH
CHCON0
CH MUTE
BU+14V
AGND
GND
CHANGER 2
Lch
Rch
HCLK
DATAH
DATAC
REQC
CH RST
REQH
CHCON0
CH MUTE
BU+14V
AGND
GND
AUX IN
Lch
Rch
ELECTRIC UNIT
Ref. No.
Name
µ-com
IC1
IC2
Reset IC
IC3,4
Analog switch
Around Q15
IC6
Regulator IC
2
BLOCK DIAGRAM
LOGIC VDD
IC3
ELECTRIC SW
VDD
X'TAL
IC1
u-COM
B.U. DET
8V DET
Q11,12,14
LOGIC VDD
IC4
ELECTRIC SW
COMPONENTS DESCRIPTION
For product control
For when the µ-com voltage 5V goes down to 3.7V or less, monitors the power supply voltage to prevent
the µ-com malfunctioning.
Receive the control signal from the µ-com and switch the changer 1, changer 2, and RCA sound input.
Power supply circuit for the µ-com power supply 5V
IC for analog switch IC power supply (8V)
RESET
VDD
AUX SW
4V DET
VDD
Q15
5V AVR
LOGIC
VDD
IC6
8V REG
Function
H/U
Lch
Rch
HCLK
DATAH
DATAC
REQC
CH RST
REQH
CHCON
CH MUTE
BU+14V
AGND
GND
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