Kenwood KAC-X20 Service Manual
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POWER AMPLIFIER
KAC-X20

SERVICE MANUAL

Fuse (30A)
(F52-0015-05)
Accessories
(W01-1606-05)
© 2006-12 PRINTED IN JAPAN
B53-0484-00 ( N ) 584
Screw set
(N99-1794-05)
This product uses Lead Free solder.
Dressing Panel
(A21-6570-01)

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Summary of Contents for Kenwood KAC-X20

  • Page 1: Service Manual

    POWER AMPLIFIER KAC-X20 SERVICE MANUAL © 2006-12 PRINTED IN JAPAN B53-0484-00 ( N ) 584 Dressing Panel (A21-6570-01) Fuse (30A) (F52-0015-05) Accessories Screw set (W01-1606-05) (N99-1794-05) This product uses Lead Free solder.
  • Page 2: Block Diagram

    KAC-X20 BLOCK DIAGRAM (X08-432) FILTER LPF/OFF/HPF OFF/15/25 ISO AMP POWER AMP IC7-9,13.15 IC4,5 IC12 Q201-229 Q241 BASS LINE IN BOOST MUTE 40-200Hz 15,25Hz SP OUT L 40-100Hz LINE OUT MO/ST SENS 40-200Hz ISO AMP IC4,5 IC16 Q201-229 Q242 BASS LINE IN...
  • Page 3 KAC-X20 COMPONENTS DESCRIPTION Ref. No. Application / Function Operation / Condition / Compatibility Q9~12 FET driver for DC/DC converter Q13,14 FET driver control for DC/DC converter Temperature detection control circuit ±15V for AVR control Q16,17 ±15V AVR constant current Q201~204...
  • Page 4: Pc Board (Foil Side View)

    KAC-X20 PC BOARD (FOIL SIDE VIEW) AUDIO UNIT X09-8570-10 A/2 (J76-0346-11) X09 B/2 D610 D616 R652 R656 R653 D612 C613 W340 R262 W341 IDLE R1 Q217 Q222 Q225 TH601 R253 IDLE R2 W154 W334 R254 W113 W122 W100 R248 R247...
  • Page 5 KAC-X20 X09-8570-10 Ref. No. Address Lch-2 2.0mV Lch-1 2.0mV IC12 R656 DC voltmeter DC voltmeter R653 IC13 D612 IC15 IC16 W309 W305 W310 W306 W308 W307 R271 Q217 Q215 Q227 TH602 R251 Q229 Q223 R225 R245 R257 R155 IDLE L2...
  • Page 6 KAC-X20 PC BOARD (FOIL SIDE VIEW) PREAMPLIFIER UNIT X08-4320-10 (J76-0351-12) TP106 W341 R123 R124 W340 R122 TP127 R147 R126 W339 W338 TP126 R121 W335 R145 R148 R146 TP119 TP115 TP105 TP116 R109 R104 R108 R107 C106 W328 C105 R106 R105...
  • Page 7 KAC-X20 AUDIO UNIT (X09-8570-10) 15.2V (2/2) +15V TP46 -15V R140 C127 C107 R122 0.047 C109 0.01 15.2V D101 IC12 R136 ISO. AMP C108 0.01 (1/2) R101 C104 R105 IC12 C106 R111 10u50 1.5K TP17 R114 (2/2) C117 22u50 TP13 -15.2V...
  • Page 8 TP150 Q617 Q606 • DC voltages are as mea- Q602 R663 sured with a high impedance Q601 W605 TP167 Q615 voltmeter. Values may vary TP164 -47.4V slightly due to variations between individual instru- KAC-X20 (1/2) ments or/and units. X09-8570-10 (2/2)
  • Page 10: Exploded View

    KAC-X20 EXPLODED VIEW M6,AU : N07-0003-08 M4,AU : N09-4214-08 φ3x12 : N09-6216-05 M4x12 : N09-6432-05 φ2x8 : N80-2008-43 φ3x10 : N80-3010-43 φ2x5 : N82-2005-43 φ2x6 : N82-2006-48 φ3x6 : N89-3006-43 φ3x8 : N89-3008-48 φ3x16 : N89-3016-48 φ3x8 : N09-6135-05 φ3x14 : N09-6217-05 φ3x10...
  • Page 11: Parts List

    KAC-X20 PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No. Description Ref. No.
  • Page 12 KAC-X20 PARTS LIST PREAMPLIFIER UNIT (X08-4320-10) Desti- Desti- Ref. No. Parts No. Description Ref. No. Parts No. Description nation nation W340,341 R92-1252-05 CHIP R 0 OHM J 1/16W C156 CD04BJ1H100M ELECTRO 10UF 50WV W342 R92-2053-05 CHIP R 0 OHM J 1/8W...
  • Page 13 KAC-X20 PARTS LIST AUDIO UNIT (X09-8570-10) Desti- Desti- Ref. No. Parts No. Description Ref. No. Parts No. Description nation nation RK73GB2A103J CHIP R J 1/10W R211,212 RD14BB2C102J 1.0K J 1/6W RK73GB2A104J CHIP R 100K J 1/10W R213,214 RD14BB2C223J J 1/6W...
  • Page 14 KAC-X20 PARTS LIST AUDIO UNIT (X09-8570-10) Desti- Desti- Ref. No. Parts No. Description Ref. No. Parts No. Description nation nation R624 RK73GB2A332J CHIP R 3.3K J 1/10W FRH10A20 DIODE R625 RK73GB2A223J CHIP R J 1/10W D7-9 1SS133 DIODE R626 RK73GB2A681J...
  • Page 15 KAC-X20 PARTS LIST AUDIO UNIT (X09-8570-10) Desti- Desti- Ref. No. Parts No. Description Ref. No. Parts No. Description nation nation Q229 TRAIT9P TRANSISTOR Q241,242 2SC4081 TRANSISTOR Q243,244 2SA1576A TRANSISTOR Q281-284 2SC4081 TRANSISTOR Q601 2SC1845-A (F,E) TRANSISTOR Q602 2SC4081 TRANSISTOR Q603...
  • Page 16: Specifications

    ........... 14-15/16 x 2-9/16 x 11-1/4inch Sensitivity (rated output) (MAX.) ........0.2V Weight ............4.6kg (10.1lbs) Sensitivity (rated output) (MIN.) ........5.0V KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. INSTALLATION...

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