Kenwood KAC 7203 Service Manual
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Page 1
$03203 KENWOOD
Kenwood Corporation
SERVICE MANUAL
© 2006-11 PRINTED IN JAPAN
853-0467-00 (N) 957
KENWOOD
Dressing Panel
(A21-6559-02) : (K type)
(A21-6560-02) : (E,M type)
@ sum/a M... if 7 , EM type
Fuse (40A)
(F52-0016-05)
Accessories Screw set Connecting cord assy
(W01-1606-05) x2 (-N99 1794- 05) (E30- -6145- 0/5)
@Q? Q 9%
<2
This product uses Lead Free solder..
This product complies with the RoHS directive for the European market.
Page 2
KAC-7203
BLOCK DIAGRAM
ISO AMP LPF/OFF/HPF POWER AMP
ICIZIIS lCl(X08) 547 024 242 02017255
L BASS '
LINE IN © BOOST MUTE +
L 40710on Sp OUT L
LINE OUT ©7 MO/ST fo-
R SENS
LINE our @-
R
BASS
LINE IN © BOOST «I MUTE ~o+
AOVIOOHZ Sp OUT R
lC1 -|
L CONTROL PVCON
SP IN of
R -O BAIT
SP IN 0- :15V D.D.CON,
To GND
COMPONENTS DESCRIPTION
. PREAMPLIFIER UNIT (X08-4190-12) Ref. No. Application / Function
Rel. No. Application / Function 0209,210 Current limiter
|C1 HPF 0211,213 Temperature detection for idling
|C2 Phase reversal amplifier (Lch only) 0215~218 Current limiter
|C3 LPF Q220,222~227,229 Power amplifier final
|C4~6 Bass-boost circuit 0241 ,242 Power amplifier mute
|C7 Bass-boost mixing amplifier 0251 ~258 Power amplifier driver
0280,282 Power amplifier ATT (-3dB)
0601,615~618 Power-ON shock preventer circuit
0 AUDIO UNIT (X09-5830-12) 0602 P-Con OFF detection
Ref. No. Application / Function 0603 Mute drive
|C1,12,16 Input isolation amplifier 0604,605 P-Con control circuit
|C5 DC/DC converter 0606 Excess voltage detection
ICG Temperature detection comparator 0607608619620 Temperature detection control circuit
012 i15V AVR 0609 Fan power supply
03~8 DC/DC converter FET 0610 Excess current detection
09~12 DC/DC converter FET driver 0611,612 DC detection
013,14 For controlling DC/DC converter FET driver 0613,1314 DC detection for latch
0201 ~204 Power amplifier initial step differential driving 0621 ,622 For LED control
0205~208 Power amplifier second step differential driving 0623 Temperature detection control circuit
ADJUSTMENT
No. ITEM ALIGNMENT POINT METHOD ALIGN FOR NOTE
Connect a DC voltmeter
IDLE VR1 (Lch) After Power on
1 between check land 2.5mV _
CURRENT VR2 (Rch) 5 mInutes
(Refer to PC BOARD)