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Kenwood KAC-PS621 Service Manual

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POWER AMPLIFIER
KAC-PS621
KAC-X621

SERVICE MANUAL

Screw
(N07-0003-08)
Fuse (25A)
(F52-0014-05)
Cover
(F07-1140-12): KAC-X621
(F07-1141-12): KAC-PS621
Screw
(N09-4214-08)
POWER IN
© 2004-2 PRINTED IN JAPAN
B53-0140-00 ( N ) 2704
Heat sink
(F01-1752-01)
FAN
VOLT
MENU
TEMP
CURR
ID NUMBER
TO H/U
REMOTE
RESET
LINE IN
LINE OUT
Screw set
(N99-1752-05)
Screw set
(N99-1577-15)
Accessory
(W01-1606-05)

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  Summary of Contents for Kenwood KAC-PS621

  • Page 1: Service Manual

    B53-0140-00 ( N ) 2704 Heat sink (F01-1752-01) VOLT MENU TEMP CURR Screw Screw (N07-0003-08) (N09-4214-08) POWER IN ID NUMBER TO H/U REMOTE RESET LINE IN LINE OUT Fuse (25A) (F52-0014-05) Screw set Cover (N99-1752-05) (F07-1140-12): KAC-X621 (F07-1141-12): KAC-PS621 Screw set (N99-1577-15) Accessory (W01-1606-05)
  • Page 2: Block Diagram

    KAC-PS621/X621 BLOCK DIAGRAM 12dB 24dB OPERATION FILTER SENSITIVITY AMP CONT MO/ST ON/OFF HPF/OFF/LPF 5V-0.2V ON/OFF Q107-135 IC1,10 IC4,6 Q101 CONTROL POWER ISO AMP BUFFER MUTE OUT-L CONTROL POWER ISO AMP BUFFER MUTE OUT-R DISP. O.C. PROTE. D.C. PROTE. u-COM O.V. PROTE.
  • Page 3 KAC-PS621/X621 COMPONENTS DESCRIPTION Ref. No Application / Function Operation / Condition / Compatibility H/U communication buffer Microprocessor Reset IC Current detection IC10 Isolation amplifier 5V AVR Q51~54 DC/DC output driver Q55~60 DC/DC drive (Final) +15V AVR Q62,63 -15V AVR Q64,65...
  • Page 4: Microcomputer's Terminal Description

    KAC-PS621/X621 MICROCOMPUTER’S TERMINAL DESCRIPTION MICROPROCESSOR : 784224YGC117 (X09 : IC6) ◊ Block Digram AMP communication I/F LX BUS I/F AMP_SCL LX_REQ_M AMP_SDA LX_REQ_S LX_DATA_M Audio control LX_DATA_S AUDIO_SCL LX_CLK AUDIO_SDA LX_RST AUDIO_MUTE HU_BU E2PROM I2C Display data monitor communication AD-I...
  • Page 5 KAC-PS621/X621 MICROCOMPUTER’S TERMINAL DESCRIPTION Pin No. Pin Name Function Processing Operation Description SCL_AMP CLK input/output AMP communication AUDIO_SCL CLK input/output with audio chip AUDIO_SDA Data input/output with audio chip AUDIO_MUTE Mute output to audio chip H : Mute OFF, L : Mute ON...
  • Page 6 KAC-PS621/X621 MICROCOMPUTER’S TERMINAL DESCRIPTION Pin No. Pin Name Function Processing Operation Description TEST Flash ROM writing Not used Not used VDD0 AVDD AD-I First current detection (for display) AD-V BU voltage detection (for display) 78~80 TEMP1~TEMP3 Temperature detection 1~3 ◊ Logic Table...
  • Page 7: Circuit Description

    KAC-PS621/X621 CIRCUIT DESCRIPTION Current detection circuit VOLTAGE MPU AD-PORT LEVEL OUTPUT 0.01 0.01 Amplify and rectify potential differences at DETECTION two points in the primary-side current circuit and send it to the AD-port of the MPU and obtain data for displaying current value.
  • Page 8: Pc Board (Component Side View)

    KAC-PS621/X621 PC BOARD (COMPONENT SIDE VIEW) PREAMPLIFIER UNIT X08-4150-10 (J76-0010-12) MONO R101 R102 R103 R104 R106 R105 C101 R115 C102 R114 C103 R107 R108 R111 R112 X08-4150-10 Ref. No. Address Refer to the schematic diagram for the values of resistors and capacitors.
  • Page 9: Pc Board (Foil Side View)

    KAC-PS621/X621 PC BOARD (FOIL SIDE VIEW) PEAMPLIFIER UNIT X08-4150-10 (J76-0010-12) TP15 TP23 TP29 TP25 TP30 TP21 TP123 TP125 TP124 TP121 TP31 TP118 TP106 TP119 TP28 TP117 TP105 TP120 TP72 TP104 TP116 TP64 TP103 TP122 TP60 TP102 TP126 TP59 TP127 TP101...
  • Page 10 KAC-PS621/X621 PC BOARD (FOIL SIDE VIEW) AUDIO UNIT X09-5770-10 A/2 (J76-0007-01) 2.5mV W319 W323 DC voltmeter W398 Q143 Q142 R184 R182 W357 W353 W358 W324 W329 Q136 Q134 Q137 W362 Q120 Q140 W399 Q138 D130 W141 W259 W260 W142 R144...
  • Page 11 KAC-PS621/X621 X09 B/2 2.5mV C251 DC voltmeter Q142 C252 D251 W313 Q139 Q133 Q135 Q119 D129 W259 W258 W257 R143 C601 Q602 W117 W211 W210 W120 BATT-L Q601 W209 W208 BATT-L W207 W206 BATT-L W205 W254 W253 L-OUT R201 C145...
  • Page 12 KAC-PS621/X621 (X09-5770-10) (A/2) 15.0V IC10 (1/2) (1/2) 10u35 22u25 R9 10K R17 10K 1000P C13 15P C14 15P INPUT R18 10K IC10(2/2) 22u25 10u35 OUTPUT (2/2) -15.0V IC1,9,10 BA4560F UPC494GS P82B96PN BA10393F 784224YGC117 PST3436UL-E 15.0V 47.5V C129 C131 D1,303,306-308,311,313,314 470P...
  • Page 13 KAC-PS621/X621 +15V AVR 15.0V CURRENT SIGNAL AMP 15.0V C309 Q351 0.2V 0.01 R441 (2/2) D309 (1/2) R333 Q352 R331 4.7K R332 0.01 47.5V W257 R440 10K -15.0V C310 0.01 -15.0V -47.5V -15V AVR ATT DRV Q263 D260 R269 R189 Q143...
  • Page 14 Q403 Q404 • DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to variations between individual instruments or/and units. KAC-PS621/X621 (1/2) X09-5770-10 A/2 (3/3)
  • Page 15 KAC-PS621/X621 (X08-4150-10) LOW PASS TP184 +10dB type TP61 TP187 TP186 TP78 0.022 3.3K 2.2K IC5(4/4 TP37 15.0V -15.0V TP62 TP181 TP76 TP31 10u16 TP30 TP25 TP20 10u16 0.22 0.22 TP64 0.22 0.22 IC1(1/4) (4/4) TP29 TP180 I.F.S ON/OFF TP23 TP75...
  • Page 16 TP112 customer. TP113 TP114 • DC voltages are as measured TP115 with a high impedance volt- meter. Values may vary 3.5V 1.5V slightly due to variations be- tween individual instruments or/and units. ED1(SEGMENT) KAC-PS621/X621 (2/2) X08-4150-10 (2/2)
  • Page 17: Exploded View

    KAC-PS621/X621 EXPLODED VIEW φ3x12 : N09-6216-05 φ4x8 : N09-6218-05 φ2x5 : N09-6220-05 φ4 WASHER : N15-1040-48 φ2x8(BLK) : N80-2008-43 φ3x10(BLK) : N80-3010-43 φ2x6 : N82-2006-48 φ2.6x6 : N84-2606-48 φ3x6(BLK) : N89-3006-43 φ3x8(BLK) : N89-3008-43 φ3x8 : N89-3008-48 φ3x16 : N89-3016-48 φ3x14...
  • Page 18: Parts List

    CHIP R J 1/10W W01-1606-05 ACCESSORY RK73GB2A203J CHIP R J 1/10W R39,40 RK73GB2A471J CHIP R J 1/10W E1 : KAC-PS621 K : KAC-X621 M1 : KAC-X621 Indicates safety critical components. (E : Europe K : North America M : Other Areas)
  • Page 19 1000PF C353,354 CK73GB1H103K CHIP C 0.010UF K C90-5588-05 ELECTRO 47UF 25WV C358 C90-5592-05 ELECTRO 10UF 35WV E1 : KAC-PS621 K : KAC-X621 M1 : KAC-X621 Indicates safety critical components. (E : Europe K : North America M : Other Areas)
  • Page 20 CHIP R J 1/10W RK73GB2A103J CHIP R J 1/10W R199 RK73GB2A562J CHIP R 5.6K J 1/10W E1 : KAC-PS621 K : KAC-X621 M1 : KAC-X621 Indicates safety critical components. (E : Europe K : North America M : Other Areas)
  • Page 21 2.2K J 1/10W D304,305 1SS355 DIODE R431 RK73GB2A473J CHIP R J 1/10W D306-308 UMZ6.8N ZENER DIODE E1 : KAC-PS621 K : KAC-X621 M1 : KAC-X621 Indicates safety critical components. (E : Europe K : North America M : Other Areas)
  • Page 22 TRANSISTOR Q143 2SC1845-A(F,E) TRANSISTOR Q144 2SC4081 TRANSISTOR Q145 2SA1576A TRANSISTOR Q146 2SC1845-A(F,E) TRANSISTOR Q147 2SA1576A TRANSISTOR E1 : KAC-PS621 K : KAC-X621 M1 : KAC-X621 Indicates safety critical components. (E : Europe K : North America M : Other Areas)
  • Page 23 KAC-PS621/X621 PARTS LIST CAPACITORS 2 2 0 • Capacitor value CC45 Color* 010 = 1pF 0 = 22pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating 100 = 10pF 2 = Shape ... round, square, etc. 5 = Value...
  • Page 24: Specifications

    KENWOOD ELECTRONICS GULF FZE KENWOOD ELECTRONICS UK LIMITED P.O. Box 61318, Jebel Ali, Dubai, U.A.E. Kenwood House, Dwight Road, Watford, Herts, WD18 9EB, United Kingdom KENWOOD ELECTRONICS (THAILAND) CO., LTD. KENWOOD ELECTRONICS DEUTSCHLAND GMBH 956 Udom Vidhya Building (Olympia) Rama IV Road, Silom, Bangrak, Bangkok 10500 Thailand Rembrücker-Str.

This manual is also suitable for:

Kac-x621