Kenwood KAC-7204 Service Manual
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Kenwood KAC-7204 Service Manual

Kenwood KAC-7204 Service Manual

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See also: Training Manual , Instruction Manual
POWER AMPLIFIER
KAC-7204

SERVICE MANUAL

Stereo/Bridgeable
Power Amplifier
Stereo/Bridgeable Power Amplifier
Fuse (40A)
(F52-0016-05)
FUSE[40A]
Accessories
(W01-1606-05)
LEFT
RIGHT
P .CON
[MIN]
BASS BOOST
LEVEL[dB]
SENSITIVITY[V]
BRIDGED
POWER IN
SPEAKER OUTPUT
Screw & wrench key set
(N99-1820-05)
This product complies with the
© 2008-1 PRINTED IN JA PAN
B53-0612-00 ( N ) 519
LPF
OFF
HPF
FILTER
[MAX]
INPUT
LPF
HPF
FREQUENCY[Hz]
FREQUENCY[Hz]
SP LEVEL INPUT
SIGNAL SENSING
LINE IN
LINE OUT
TURN-ON
Connecting cord assy
(E30-6145-05)
19cm
This product uses Lead Free solder.
RoHS
Dressing Panel
(A21-6640-01): (E,K type)
(A21-6641-01): (M type)
E,K type
M type
directive for the European market.

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Summary of Contents for Kenwood KAC-7204

  • Page 1: Service Manual

    POWER AMPLIFIER KAC-7204 SERVICE MANUAL © 2008-1 PRINTED IN JA PAN B53-0612-00 ( N ) 519 Dressing Panel (A21-6640-01): (E,K type) (A21-6641-01): (M type) E,K type Stereo/Bridgeable Power Amplifier M type Stereo/Bridgeable Power Amplifier Fuse (40A) (F52-0016-05) FUSE[40A] LEFT RIGHT P .CON...

  • Page 2: Block Diagram

    KAC-7204 BLOCK DIAGRAM -0.5dB_ATT -0.83dB_ATT +16.4dB_AMP LPF/OFF/HPF +6.85dB_AMP 40Hz=18dB =15.9dB =6.0dB IC10 Bass ISO-AMP H.P.F Boost FREQ (50~200Hz) IC12 SENS. FREQ L.P.F (40Hz) FREQ +15.8dB (50~200Hz) IC11 Bass ISO-AMP H.P.F Boost FREQ -0.83dB_ATT 40Hz=18dB (50~200Hz) +6.85dB_AMP =6.0dB Q281,283 POWER AMP Q241 Q201...229...
  • Page 3 KAC-7204 COMPONENTS DESCRIPTION Ref. No. Application / Function Operation / Condition / Compatibility Q201~204 Differential fi rst stage amplifi er Q205~208 Differential second stage amplifi er Q209,210 Differential second stage current mirror Q211,213 Temperature compensation Tr Q215~218 Current limiter Q220,222~227,229 Power amplifi...

  • Page 4: Pc Board (Foil Side View)

    KAC-7204 PC BOARD (FOIL SIDE VIEW) AUDIO UNIT X09-8760-10 (J76-0476-11) Q211 Q223 Q227 W401 R245 W171 W118 W402 W172 W119 W403 W146 W176 W168 W404 W177 W169 W147 W138 W308 W139 W309 W148 W312 W310 W149 W429 TH-GND W182 R640...
  • Page 5 KAC-7204 W217 W299 W229 Q229 Q225 R229 R232 C219 W108 R250 C222 C230 W109 W266 R237 W110 W111 W112 W113 SP-R SP-R R249 W114 W115 SP-L R239 D206 R271 W221 Q254 W267 R225 R261 Q252 W255 R251 D261 R218 W274...
  • Page 6 KAC-7204 (X09-8760-10) +15V 15.0V D101 (2/2) TP15 -15.0V R113 (1/2) TP19 TP21 4.7K C115 R169 R109 10u50 R107 TP16 R125 10K R171 R111 C131 C698 0.01 100P R101 C103 10u50 TP29 LINE 0.01 R100 LINE TP22 R170 R112 C132 100P...
  • Page 7 KAC-7204 +15V +15V -15V -15V 15.0V LPF 50-200Hz 24dB/OCT HPF 12dB/OCT,F=VR CONT (50-200Hz) C115 10u50 ISO-R (1/2) R117 8.2K R139 C119 TP32 C107 C117 10u50 0.22 INPUT SENS. TP43 IC10 VR3 10K(A) (1/2) R145 (2/2) TP30 VR2 50K(C) 15.0V R131 56K...
  • Page 8 KAC-7204 +15V -15V IC10 TP67 (1/2) 2SA965-F R151 R422 2SA992-A C123 2.2K 4.7u50 2SC1845-A IC10 2SC2235-F R165 2.2K (2/2) C125 100P VR4 10K(C) TP60 TP61 BASS C138 BOOST 100P R423 R148 2.2K IC11 C136 (2/2) 4.7u50 R144 B.B 0+18dB (VR) F=40Hz IC11 2.2K...

  • Page 9: Exploded View

    KAC-7204 EXPLODED VIEW 2.6x13 : N09-6365-05 M4x8 : N09-6726-05 3x10 : N80-3010-43 : N89-3006-43 : N89-3008-48 3x16 : N89-3016-48 3x10 : N09-6447-05 M6 AU : N07-0003-08 M4 AU : N09-4214-08 Bundled to the transistor. Bundled to the transistor. (X09-876) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 10: Parts List

    CK73GB1H104K CHIP C 0.10UF C698 CK73GB1H103K CHIP C 0.010UF K C109-112 CD04BJ1H100M ELECTRO 10UF 50WV C699 CD04BJ1H010M ELECTRO 1.0UF 50WV E1 : KAC-7204 (Europe) K : KAC-7204 (North America) Indicates safety critical com po nents. M1 : KAC-7204 (Other Areas)
  • Page 11 J 1/10W R243 R92-0205-05 METAL-PLATE 0.1 K 2W R123-126 ✽ RN73GE1J103D CHIP R D 1/16W R245-248 R92-0205-05 METAL-PLATE 0.1 K 2W E1 : KAC-7204 (Europe) K : KAC-7204 (North America) Indicates safety critical com po nents. M1 : KAC-7204 (Other Areas)
  • Page 12 RK73GB2A000J CHIP R J 1/10W R648 RK73GB2A472J CHIP R 4.7K J 1/10W W283 R92-2053-05 CHIP R 0 OHM J 1/8W E1 : KAC-7204 (Europe) K : KAC-7204 (North America) Indicates safety critical com po nents. M1 : KAC-7204 (Other Areas)
  • Page 13 DIODE IC1,2 BA4560RF ANALOGUE IC TL494IDR ANALOGUE IC IC6-8 BA4560RF ANALOGUE IC IC10-12 BA4560RF ANALOGUE IC 2SC4883ANF TRANSISTOR 2SA1859ANF TRANSISTOR E1 : KAC-7204 (Europe) K : KAC-7204 (North America) Indicates safety critical com po nents. M1 : KAC-7204 (Other Areas)

  • Page 14: Specifications

    High Pass Filter Frequency (-12 dB/oct.) Weight ................3.2 kg ............50 – 200 Hz (variable) Bass Boost Circuit (40 Hz) ....0 – +18 dB (variable) KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be General changed without notice.
  • Page 15 KAC-7204 PC BOARD (FOIL SIDE VIEW) AUDIO UNIT X09-8760-10 (J76-0476-11) W217 W299 W229 Q211 Q229 Q227 Q223 Q225 R229 R232 W401 R245 C219 W171 W108 W118 R250 C222 W402 C230 W172 W119 W109 W266 R237 W403 W146 W176 W168 W110...
  • Page 16 C210 Q202 Q204 Q213 R238 C228 Q216 TP28 3.6K MUTE P-CON R282 D295 -13.9V C233 Q220 Q617 Q210 100P R278 R663 Q615 SIGNAL LINE Q256 GND LINE Q224 R260 R234 TP38 TP41 Q258 B LINE TP33 47.3V B LINE KAC-7204...

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