Kenwood KAC 6402 Service Manual
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Extracted text from Kenwood KAC 6402 Service Manual (Ocr-read)
Page 2
KAC-6402
BLOCK DIAGRAM
ISOLATION
LINE IN
AL 5
LINE IN
AR
AMPLIFIER
ISOLATION
AMPLIFIER
ISOLATION
LINE IN
BL
LINE IN
BR
AMPLIFIER
SPEAKER <
INPUT
AVAB
+6dB
POWER SPEAKER
Ash AMPLIFIER OUT AL
INPUT
GAIN
CONT POWER SPEAKER
sT/MONO AMPLIFIER OUT AR
MUTE
POWER SPEAKER
och AMPLIFIER OUT BL
INPUT
AIN , , ,
CONT HPF 1. POWER SPEAKER
1 I LPF+6dB I AMPLIFIER OUT BR
ISOLATION I
AMPLIFIER , fen/MONO
:15V DC/DC DC DETECT AND
AVR CONVERTER OVER ROAD PROTECTION
, P CON CIRCUIT - P CON
THERMAL -OVER VOLTAGE
PROTECTION PROTECTION BATTERY
OdB
+29.5dB
COMPONENTS DESCRIPTION
0 AUDIO UNIT (X09-5890-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1,3 Buffer amplifier Lowers impedance and amplify by 6dB
IC2,4 Isolation amplifier Reduces common mode noise
ICS,9 Buffer amplifier Rch operates as reverse amplifier
ICG,10 Reverse buffer amplifier Reverse amplifier operation of 6dB
|C7,8,11,12 LPF/HPF LPF and HPF with Variable cut off
IC13 DC-DC converter Oscillation and control of DC-DC converter
03,4 Constant voltage power supply Constant voltage control of i15V
05,6 DC-DC converter Switching FET
07,8,9,10 DC-DC converter Gate driver for 05,6
011,12 DC-DC converter ON/OFF of IC13 output
0101,102,201,202 Input mute circuit Shock noise absorption at power ON/OFF
0103~106,203~206 Power amplifier First step differential absorption
0107~110,207~210 Power amplifier Second step differential absorption
0111,112,211,212
Power amplifier
Second step current mirror load
Q113,114,213,214
Power amplifier
Power amplification Circuit bias temperature compensation
0115~118,215~218 Power amplifier Excess current detection
0119~122,219~222 Power amplilier Power amplification step darlington driver
0123~126,223~226 Power amplifier Power amplification step darlington output transistor
0601 B-class step mute Mute signal generation circuit: Normally ON
0602 Mute circuit Mute signal generation circuit: Normally OFF
0603 Input mute Mute signal generation circuit: Normally OFF
0604 Power ON/OFF Primary power supply control transistor: Normally ON
0605 Power ON/OFF Power control Circuit
0606 Power ON/OFF Excess voltage protection circuit: Goes OFF when primary input voltage of 16V or less
0610 Excess current detection Goes ON When detecting excess current and turns OFF DC-DC converter
0611,612 DC output voltage detection Goes ON when detecting DC output voltage from power amplifier