Kenwood KAC-PS521, KAC-X521 Service Manual
POWER AMPLIFIER
KA C-PS52 1
KA C-X52 1
SERVICE MANUAL
© 2004-2 PRINTED IN JAPAN
B53-0139-00 (N) 2439
Heat sink
(F01-1751-01)
Screw
(N07-0003-08)
30
30
FUSE(30A×2)
POWER IN
Fuse (30A)
(F52-0015-05)
Cover
(F07-1138-12): KAC-X521
(F07-1139-12): KAC-PS521
Screw
(N09-4214-08)
5
4
3
2
1
VOLTFAN
CURRTEMP
6
7
8
9
0
MENU
RESETREMOTETO H/UID NUMBER
Screw set
(N99-1752-05)
Screw set
(N99-1577-15)
Accessory
(W01-1606-05)
KA C-PS521/X521
(X09-5760-10)
BLOCK DIAGRAM
to H/U
to POWER AMP
BAT
GND
P-CONT
IC1,10 IC1
I.S.A I.F.S
(X08-4150-10)
V PROT.
L.P.F
IC5
H.P.F
ED1 IC7
LCD
IC6
Q356,358
IC2 Q61
DC/DC
CONVERTER
LCD
DRIVER
u-COM
Q66
5V AVR
FAN AVR FAN
IC3,4,6
Q69
SW 5V
AVR
AMP
CONT.
TEMP
PROT.
+15V AVR
Q62
-15V AVR
Q101,102
MUTE
DC PROT
CURRENT PROT
POWER AMP
COMPONENTS DESCRIPTION
● PREAMPLIFIER UNIT (X08-4150-10)
Ref. No Application / Function Operation / Condition / Compatibility
IC1 Infrasonic filter Controlled by microprocessor
IC3 Tone and volume variable
IC4 6dB voltage amplification
IC5
IC6
IC7 LCD driver Controlled by microprocessor
● AUDIO UNIT (X09-5760-10)
Ref. No Application / Function Operation / Condition / Compatibility
IC1 Buffer
IC2 DC/DC converter
IC3 AMP communication buffer
HPF
LPF
Lch : 6dB voltage amplification
Rch : Signal 180 reverse and 6dB voltage amplification
2
KA C-PS521/X521
COMPONENTS DESCRIPTION
Ref. No Application / Function Operation / Condition / Compatibility
IC5 H/U communication buffer
IC6 Microprocessor
IC7 Reset IC
IC8 E2PROM
IC9 Current detection
IC10 Isolation amplifier
Q50 5V AVR
Q51~54 DC/DC output driver
Q55~60 DC/DC
Q61 +15V AVR
Q62,63 -15V AVR
Q64,65 DC/DC converter (IC2) ON/OFF Controlled by microprocessor
Q66,68 5V AVR
Q69 5V AVR ON/OFF
Q70,71 Power supply detection
Q81 +15V AVR
Q91,92 When P-CON is OFF, DC/DC driver stop speedy
Q97 AMP communication stability power supply
Q101,102 Mute
Q103~112 A class first stage amplifier
Q113~118 A class 2nd stage amplifier
Q119,120 Final temperature compensation
Q121~124 Amplifier current detection
Q125~132 Final driver
Q133~140 Final
Q141 Mute control
Q142~145 Amplifier limiter
Q146,147 Amplifier current detection
Q148,149 DC detection
Q301~307 H/U communication output driver
Q313 H/U communication output driver
Q314 H/U communication ON/OFF
Q341~344 H/U communication input driver
Q346 H/U communication output driver
Q347~349 AMP and H/U communication ON/OFF control
Q351,352 BATT voltage output
Q353~358 Fan stability power supply
Q403 LCD backlight LED control
Q404 LED control
3
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