Kenwood KAC-PS621 Service Manual Download Page 1

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POWER AMPLIFIER

KAC-PS621
KAC-X621

SERVICE MANUAL

VOLT

FAN

CURR

TEMP

4 5 6 7

POWER IN

RESET

LINE IN

LINE OUT

REMOTE

TO H/U

ID NUMBER

Screw set
(N99-1752-05)

Screw set
(N99-1577-15)

Heat sink
(F01-1752-01)

Accessory
(W01-1606-05)

Cover
(F07-1140-12): KAC-X621
(F07-1141-12): KAC-PS621

Screw
(N07-0003-08)

Screw
(N09-4214-08)

Fuse (25A)
(F52-0014-05)

Summary of Contents for KAC-PS621

Page 1: ...T FAN CURR TEMP MENU 0 1 2 3 4 5 6 7 8 9 POWER IN RESET LINE IN LINE OUT REMOTE TO H U ID NUMBER 25 25 25 Screw set N99 1752 05 Screw set N99 1577 15 Heat sink F01 1752 01 Accessory W01 1606 05 Cover F07 1140 12 KAC X621 F07 1141 12 KAC PS621 Screw N07 0003 08 Screw N09 4214 08 Fuse 25A F52 0014 05 ...

Page 2: ...or AUDIO UNIT X09 5770 10 Ref No Application Function Operation Condition Compatibility IC1 Buffer IC2 DC DC converter IC3 AMP communication buffer COMPONENTS DESCRIPTION IC1 10 ISO AMP ISO AMP ISF ISF HPF HPF BUFFER BUFFER LPF CONTROL MUTE MUTE AMP CONTROL AMP POWER AMP POWER AMP IC1 IC5 IC4 6 IC3 Q101 Q107 135 OUT IN OUT IN L R OPERATION IFS FILTER SENSITIVITY AMP CONT OUT R OUT L H U COM AMP CO...

Page 3: ...fier Q113 118 A class 2nd stage amplifier Q119 120 Final temperature compensation Q121 124 Amplifier current detection Current limiter Q125 132 Final driver Q133 140 Final Q141 Mute control Q142 145 Shock noise prevention Q146 147 AMP current detection Q148 149 DC detection Q249 250 263 ATT control Synchronized with temperature detection Q301 307 H U communication output driver Q310 H U communicat...

Page 4: ...control E2PROM I2C communication MICROPROCESSOR 784224YGC117 X09 IC6 Block Digram Terminal Function Pin No Pin Name I O Function Processing Operation Description 1 3 TEMP4 TEMP6 I Temperature detection 4 6 4 AVSS GND 5 L_CE O CE output to LCD driver H LCD driver CE 6 LX_REQ_S O Data transmit request to H U H OFF L ON 7 AVREF1 DA reference voltage 8 L_DATA_L I Data input from LCD driver 9 L_DATA_A ...

Page 5: ...ot used 46 COMM SW O Communication IC power switch H ON L OFF 47 50 NC O Not used 51 D PWER O D class amplifier power supply control H ON L OFF 2ch 4ch L fixed 52 DC DET I Speaker output DC voltage detection H Normal L Abnormal 53 NC O Not used 54 POWER ON O Amplifier power supply control H ON D AB class L OFF 55 5VSW O 5VSW H OFF L ON 56 MUTE1 O Amplifier section input stage mute control H OFF L ...

Page 6: ...ection for display 77 AD V I BU voltage detection for display 78 80 TEMP1 TEMP3 I Temperature detection 1 3 MICROCOMPUTER STERMINAL DESCRIPTION 2 AMP ID AMP ID is checked only ohce at the time reset is released or when the microcomputer is released from the low consump tion mode When set to AMP ID 8 9 no remote control is possible AMP ID DIP SW1 DIP SW2 DIP SW3 DIP SW4 25pin 26pin 27pin 28pin 0 Hi...

Page 7: ...int Method Align For Note Fig 1 IDEL CURRENT VR1 Lch Connect a DC voltmeter between 2 5mV After Power on PC board VR2 Rch check land A B 2 minutes X09 577 ADJUSTMENT Current detection circuit Amplify and rectify potential differences at 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 Constant current output circuit R...

Page 8: ...3 C4 C65 R8 R7 C12 R63 R64 C66 R65 C63 R39 R40 C5 R5 C64 R66 C6 R6 R3 R4 C11 C107 1 22 7 8 1 14 1 7 14 8 1 4 8 5 1 4 8 5 64 16 1 49 33 48 17 32 1 10 20 11 1 1 1 1 200Hz 50Hz 1 3 5V 200mV 1 24 50Hz 1 2 200Hz R13 R116 C105 C61 C9 C10 C15 C16 C17 C18 C19 C20 C25 C26 C31 C32 C39 C67 C68 R117 LOW PASS ST MONO OFF ON ON OFF LPF OFF INPUT SENS HPF HI PASS ANP CONT I S F 503C 503C 103A VR1 VR3 VR2 CN1 D1 ...

Page 9: ...TP56 TP59 TP60 TP61 TP62 TP63 TP64 TP65 TP66 TP67 TP68 TP69 TP70 TP71 TP72 TP73 TP74 TP75 TP76 TP78 TP88 TP89 TP90 TP91 TP92 TP93 TP94 TP98 TP99 TP100 TP101 TP102 TP103 TP104 TP105 TP106 TP107 TP108 TP109 TP110 TP111 TP112 TP113 TP114 TP115 TP116 TP117 TP118 TP119 TP120 TP121 TP122 TP123 TP124 TP125 TP126 TP127 TP128 TP129 TP130 TP132 TP180 TP181 TP182 TP189 TP186 TP188 TP185 TP184 TP187 TP192 TP1...

Page 10: ... C103 C104 C111 C112 C137 C139 C140 C143 C W107 C260 C301 C308 C349 C350 C351 C352 C358 C403 C70 W96 W200 W227 W87 R105 R106 W220 W45 C3 C4 W61 W62 C15 C16 C19 C101 C102 C107 C108 C115 C116 C117 C118 C119 C120 C122 C123 C124 C129 C130 C131 C132 C133 C134 C135 C136 C141 W75 W259 W203 W129 W63 W72 R1 R2 W197 R119 R120 R121 R122 R123 R124 R125 R126 R127 R128 R129 R130 R131 R132 R134 R136 R138 R145 R1...

Page 11: ... W25 W27 W258 W38 W24 W49 W51 W47 W30 W29 W40 W43 W35 W223 W224 W8 W7 W6 W5 W4 W10 W34 W215 W207 W208 W209 W211 W210 W12 W15 W16 W225 W222 W221 W254 W69 B E B E E 4 1 8 5 1 8 9 16 E B E B E B E B B E BE BE B E BE B E BE BE D S G D S G D S G D S G D S G D S G D S G D S G B B GND GND GND GND L OUT R OUT B B Lch Lch P CON BATT F BATT F BATT BATT BATT GND BATT L BATT L BATT L DC voltmeter 2 5mV VR1 Re...

Page 12: ...0P C132 470P C130 4 7 R158 4 7 R164 4 7 R161 4 7 R160 VR1 220 C115 330P R211 1 1 R212 2 1 1 2 1 2 2 3 1 8 2K R277 8 2K R278 R20 22K R19 22K R105 33K R106 33K C104 470P C103 470P 1 2 2 39 2 2K R102 22u25 C102 22u25 C101 4 7K R104 2 2K R101 1K R222 1K R221 R249 4 7K 4 7K R250 R103 4 7K TP22 TP21 TP20 TP19 TP15 TP16 TP17 TP18 TP10 TP12 TP14 TP5 TP6 TP7 TP8 TP2 TP3 TP1 TP4 6 CN10 OUTPUT Rch Lch INPUT ...

Page 13: ...39 180 1K R332 4 7K R333 15K R438 47 R330 TH3 TH1 TH4 100 R458 R459 AUDIO MUTE SDA R444 2 7K R443 2 7K R451 1K R450 1K AUDIO C457 0 01 R478 11K C456 0 01 R477 11K R476 13K C454 0 01 R475 13K R480 10K R241 5 1K 100 R70 4 7K R341 47 R335 47 R309 0 1 C305 11K R311 1 R193 330 R269 R192 15K 10K R195 8 2K R194 100K R196 0 01 C142 5 6K R191 R322 1K R321 1K C312 100P R326 1M 4 3 C311 100P R325 1M 5 VEE IN...

Page 14: ...56 55 54 53 52 43 100K R484 100 R421 100K R481 100 R422 R424 10K 100 R458 100 R459 AUDIO MUTE O C602 1000P C603 1000P C406 0 01 R430 2 2K 56 R58 56 R57 1000P C53 R62 4 7K R61 4 7K R52 33K 1K R76 510 R77 C71 0 1 10K R79 100K R74 10K R71 R476 13K C454 0 01 R475 13K 4 5 3 2 1 1 5K R56 1 5K R53 6 8K R53 18K R54 R83 3 3K R82 3 9K 3 9K R85 0 047 C145 0 047 C146 1 2W 10 R202 1 2W 10 R201 10K R86 54 52 C7...

Page 15: ...S34 S35 TP22 TP8 TP9 R33 47K TP21 TP92 TP128 TP74 R6 22K 5 6 7 R66 39K 10 9 TP28 C68 10u16 8 TP32 TP65 T TP37 TP25 TP20 R1 47K 4 5 6 ST MONO 3 2 1 7 8 R2 C4 0 22 47K 0 22 C3 R5 TP31 0 22 0 22 C6 0 22 R4 130K TP23 TP183 C64 0 22 0 22 TP29 22K C5 2 3 0 22 1 4 C63 56K C66 R64 TP75 R8 47K 7 1 2 TP180 C65 12 13 11 5 4 C67 10u16 14 TP76 TP30 TP181 TP64 I F S ON OFF 8 3 C20 10u16 47K R24 6 R23 47K 10u16 ...

Page 16: ...18 10u16 TP53 C17 10u16 2 10u16 TP41 C15 1 TP42 3 5 4 7 TP60 6 8 R21 10K R9 47K TP192 TP43 TP39 TP38 R14 100 R16 100 R15 100 TP40 TP59 OFF ON B M S TP115 S13 TP114 S14 TP113 S15 TP112 S16 TP111 S17 TP110 S18 TP109 S19 TP108 S20 TP107 S21 S11 TP126 S12 TP127 0 1 C73 0 15 C74 TP182 TP189 0 01 C28 0 01 C27 C75 0 033 47K R52 0 01 C49 0 01 C48 0 01 C38 0 01 C37 1K R17 R26 56K 0 1 C22 0 22 C24 47K R31 1...

Page 17: ...x8 BLK φ3x8 φ3x16 φ3x14 φ2x8 φ3x12 N09 6216 05 N09 6218 05 N09 6220 05 N15 1040 48 N80 2008 43 N80 3010 43 N82 2006 48 N84 2606 48 N89 3006 43 N89 3008 43 N89 3008 48 N89 3016 48 N09 6217 05 N80 2008 48 N83 3012 48 26 27 28 Mx2 Hx2 Lx2 Cx2 Qx2 Gx3 4 5 1 13 14 6 8 719 H L L L L P P P H 746 743 723 723 722 715 751 F F Ax3 Ax4 Kx2 715 730 752 G G L L L 731 24 40 42 ED1 L Nx8 Nx14 41 7 17 16 715 724 7...

Page 18: ...NDING HEAD TAPTITE SCREW P 2B N80 2008 48 PAN HEAD TAPTITE SCREW Q 2B N83 3012 48 PAN HEAD TAPTITE SCREW 28 1A W01 1606 05 ACCESSORY 40 2B B11 1446 04 REFLECTION SHEET 41 2A B11 1447 04 OPTICAL DIFFUSER 42 2B B19 2258 12 LIGHTING BOARD D2 B30 1694 05 LED ED1 B38 1150 05 LCD DISPLAY ASSY C3 6 CK73FB1C224K CHIP C 0 22UF K C9 10 CD04AS1H010M ELECTRO 1UF 50WV C11 13 CK73GB1H103K CHIP C 0 010UF K C15 2...

Page 19: ...F J C21 CK73FB1H104K CHIP C 0 10UF K C51 C90 5557 05 ELECTRO 10UF 25WV C52 C90 5588 05 ELECTRO 47UF 25WV C53 CK73GB1H102K CHIP C 1000PF K C54 C90 5588 05 ELECTRO 47UF 25WV C55 56 CD04BC1C392M ELECTRO 3900UF 16WV C61 C90 5592 05 ELECTRO 10UF 35WV C62 CK73GB1H103K CHIP C 0 010UF K C63 64 C90 5588 05 ELECTRO 47UF 25WV C65 66 CK73GB1H103K CHIP C 0 010UF K C67 68 C90 5592 05 ELECTRO 10UF 35WV C69 C90 5...

Page 20: ...72J CHIP R 4 7K J 1 10W R73 RD14DB2H100J SMALL RD 10 J 1 2W R74 RK73GB2A104J CHIP R 100K J 1 10W R76 RK73GB2A102J CHIP R 1 0K J 1 10W R77 RK73GB2A511J CHIP R 510 J 1 10W R79 RK73GB2A103J CHIP R 10K J 1 10W R80 RK73GB2A473J CHIP R 47K J 1 10W R81 RK73GB2A472J CHIP R 4 7K J 1 10W R82 RK73GB2A392J CHIP R 3 9K J 1 10W R83 RK73GB2A332J CHIP R 3 3K J 1 10W R84 RK73GB2A152J CHIP R 1 5K J 1 10W R85 RK73GB...

Page 21: ...W R350 351 RK73GB2A103J CHIP R 10K J 1 10W R352 RK73GB2A302J CHIP R 3 0K J 1 10W R353 RK73GB2A152J CHIP R 1 5K J 1 10W R354 357 RK73GB2A100J CHIP R 10 J 1 10W R360 RK73GB2A103J CHIP R 10K J 1 10W R401 RK73GB2A103J CHIP R 10K J 1 10W R402 RK73GB2A473J CHIP R 47K J 1 10W R421 422 RK73GB2A101J CHIP R 100 J 1 10W R423 424 RK73GB2A103J CHIP R 10K J 1 10W R425 426 RK73GB2A181J CHIP R 180 J 1 10W R427 42...

Page 22: ...TA114EUA DIGITAL TRANSISTOR Q97 2SC4081 TRANSISTOR Q101 102 2SC4081 TRANSISTOR Q103 110 2SA992 A F E TRANSISTOR Q111 112 2SA1576A TRANSISTOR Q113 116 2SC3478AA L K TRANSISTOR Q117 118 2SA1376AA L K TRANSISTOR Q119 120 2SC3419 Y TRANSISTOR Q121 122 2SC1845 A F E TRANSISTOR Q123 124 2SA992 A F E TRANSISTOR Q125 128 2SC2235 F TRANSISTOR Q129 132 2SA965 F TRANSISTOR Q133 136 2SC3856NF TRANSISTOR Q137 ...

Page 23: ...20 330 470 750 Tolerance More than 10pF Code C D G J K M X Z P No code 0 25 0 5 2 5 10 20 40 80 100 More than 10µF 10 50 20 20 0 Less than 4 7µF 10 75 Voltage rating 2nd word A B C D E F G H J K V 1st word 0 1 0 1 25 1 6 2 0 2 5 3 15 4 0 5 0 6 3 8 0 1 10 12 5 16 20 25 31 5 40 50 63 80 35 2 100 125 160 200 250 315 400 500 630 800 3 1000 1250 1600 2000 2500 2150 4000 5000 6300 8000 CHIP CAPACITORS E...

Page 24: ... 0 5 THD Rated Power Output 4Ω 20Hz 20kHz 14 4V 150W x 2 0 05 THD 4Ω DIN45324 14 4V 150W x 2 2Ω 1kHz 14 4V 300W x 2 0 5 THD Bridged Power 4Ω 1kHz 14 4V 600W x 1 0 5 THD MAX Power Output 1200W Low Pass Filter 50Hz 200Hz 24dB oct High Pass Filter 50Hz 200Hz 12dB oct Infrasonic Filter 15Hz 24dB oct Frequency Response 5Hz 70kHz 0 3dB S N Ratio 105dB Sensitivity Max 0 2V Rated Output Sensitivity Min 5V...

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