Kenwood KAC-8101D, Руководство по обслуживанию

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KAC-8101D/8151D
2
BLOCK DIAGRAM
TRANSFORMER
+
++
ISO AMP
INPUT
0.2-5.0V
VOL BOOST
+12dB/OFF 50-200Hz
FILTER FILTER
OFF/15/25Hz
BASS LOWPASS INFRASONIC INPUT
REMOTE
+0/+6/+9/+12dB
WIRED
CONTROL
EXPANDER
ON/OFF
MUTE
-15V AVR +15V AVR
BATT
P. CON
GND
CONVERTER
SW
TRIANGLE
WAVE
PWM MIX
AMP
COMPEARATE
(DEAT TIME)
POWER
AMP
D CLASS AMP
OUTPUT
OUTPUT
THERMAL
PROTECTION
PROTECTION
OVELOAD DC OFFSET
PROTECTION
AUDIO UNIT (X09-5480-1x)
Ref No. Application / Function
IC1 Isolation amplifier
IC2 Bus boost amplifier
IC3
(1/2) : Lowpass filter amplifier
(2/2) : Infrasonic amplifier
IC4 Expander amplifier
IC5 DC detection rectification amplifier
IC6 Expander detection and difference output
IC7
(1/2) : Triangular waveform generation
(2/2) : Summing amplifier
IC8
(1/2) : ASO (current, voltage comparison) detection
(2/2) : DC converter control
IC9
(1/2) : Triangular waveform generation
(2/2) : PWM waveform generator
IC10,11 Dead time generator
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
COMPONENTS DESCRIPTION
Ref No. Application / Function
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
Q47~50 Small-signal
±
power supply
Q51,52
When OFF, quick break in a circuit of – power
supply for small-signal circuit
Q53 Power FET control power supply
Q55 Mute, LED and protection control
Q61~64 Power FET driver
Q65,66 Power FET
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