Kenwood KAC-PS811D Service Manual page 3

Ref. No Application / Function
IC4,5 NAND
IC6 Comparator
IC7 Signal amplification
IC10 Element operation control
IC11 Reset
IC13 DC/DC converter
IC14 Signal amplification
IC15 Bi-directional buffer
IC16 Comparator
Q1,2,5,7 Digital signal transmission
Q3,4,6,8 Digital signal transmission
Q9 Mute
Q10 Mute
Q15,18,19,21,22,27,
Signal amplification, switching
Q28,37~40,42~45
Q16,17 Voltage control
Q20 Voltage control
Q23,24,35,36,41,83 Voltage control
Q25,29,84 AVR
Q26,30,110 AVR
Q31,33,46,109 Voltage control
Q47 AVR
Q52-55 Voltage current converter
Q57,58,60,61,
Switching
Q64,65,67~70
Q59,63 Voltage control
Q62 Voltage detection
Q66 Voltage detection
Q71,72 Waveform shaping
Q73,78 Voltage detection
Q74-77 Current amplification
Q79,80 Voltage control
Q81,82 Voltage control
Q88,89,98,99 Voltage control
Q95,96 Voltage control
Q97 Voltage control
Q102,111 Voltage control
Q103,104 Voltage control
Q106-108 AVR
COMPONENTS DESCRIPTION
D class section reverse wave, deadtime, generation and rectification
Short circuit detection of SP output
For SP output short-circuit detection, send the output to comparator
Communication, display, protection, etc. control
Reset signal is output when voltage goes below standard voltage
Voltage on secondary side, which produces the drive signal for switching
element, will be limited to below standard voltage
To have µcom display current value, amplify potential differences of GND
Send/Receive data and clock between AMP
Receive from H/U data and clock
Send LX-REQ-M signal to H/U
Send LX-DATA-S signal to H/U
Mute drive signal generation
Turn audio signal OFF
D class section voltage or current amplification
Match the beginning of the fall to +15V when -15V power supply is OFF
5V power supply ON/OFF
Fan voltage ON/OFF and limiting over voltage
+15V
-15V
D class section predrive stage power supply ON/OFF
D class section first stage supplementary power supply
Over current detection when SP is shorted
DC/DC converter switching
In order to have µcom display voltage value, send voltage to it only when 5V SW ON
Pcon detection
Pcon over voltage detection
For SP output short-circuit detection, send the output to comparator
DC detection of output
Switching FET drive current amplification
DC/DC converter power supply ON/OFF
DC/DC converter drive waveform ON/OFF
5L digital signal reception
When Comm-SW of µcom is ON, turn communication system power supply ON
Normally 15V power supply and over voltage control
When Comm-SW of µcom is ON, turn communication system 5V power supply ON
LCD backlight and illumination LED control
µcom system 5V power supply.
KAC-PS811D/X811D
Operation / Condition / Compatibility
3