Block Diagram; Components Description - Kenwood KAC-8101D Service Manual

KAC-8101D/8151D
QQ
3 7 63 1515 0
ISO AMP
INPUT
BATT
P. CON
GND
TE
L 13942296513
AUDIO UNIT (X09-5480-1x)
Ref No.
IC1 Isolation amplifier
IC2 Bus boost amplifier
(1/2) : Lowpass filter amplifier
IC3
(2/2) : Infrasonic amplifier
IC4 Expander amplifier
IC5 DC detection rectification amplifier
IC6 Expander detection and difference output
(1/2) : Triangular waveform generation
IC7
(2/2) : Summing amplifier
(1/2) : ASO (current, voltage comparison) detection
IC8
(2/2) : DC converter control
(1/2) : Triangular waveform generation
IC9
(2/2) : PWM waveform generator
IC10,11 Dead time generator
www
IC12 Bus boost level changer
IC15 DC/DC converter
.
Q1 Mute
Q3~5 Output FET control (current amplifier)
Q7~10 Output FET control (current amplifier)
Q11~14 Output FET driver
2

BLOCK DIAGRAM

WIRED
REMOTE
CONTROL
+0/+6/+9/+12dB
INPUT BASS LOWPASS
VOL BOOST FILTER
0.2-5.0V +12dB/OFF 50-200Hz
-15V AVR
TRANSFORMER
CONVERTER
SW

COMPONENTS DESCRIPTION

Application / Function
x ao
y
i
8
INFRASONIC
FILTER EXPANDER
OFF/15/25Hz ON/OFF
D CLASS AMP
+15V AVR
TRIANGLE
WAVE
MIX PWM
COMPEARATE
AMP
(DEAT TIME)
THERMAL OVELOAD
PROTECTION PROTECTION
Q Q
3 6 7 1 3
Ref No.
Q15,16 Output FET
Q17~20 Speaker output current detection
Q21,22 Output FET control power supply and control
Q23~25 DC protection
Q26,27 ASO DC detection
Q28 IC8 (2/2) output logic invert
Q31 Reduced voltage protection
Q32 Over voltage protection
Q34 DC/DC converter power supply
Q36 DC/DC converter control
Q37~40 Power FET driver
Q41~46 Power FET
Small-signal ± power supply
Q47~50
When OFF , quick break in a circuit of – power
Q51,52
supply for small-signal circuit
u163
Q53 Power FET control power supply
.
Q55 Mute, LED and protection control
Q61~64 Power FET driver
Q65,66 Power FET
2 9 9 4 2 8
MUTE
POWER
AMP
OUTPUT
OUTPUT
DC OFFSET
PROTECTION
1 5 0 5 8 2 9 9 4
Application / Function
m
co
9 9
2 8 9 9