Kenwood KDC-W241AY Service Manual Download Page 21

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KDC-W241AY/W241GY/W3041A/W3041AY/W3041G

/W3041GY/W312A/W312AY/W312G/W312GY/W312SAY

C506

C512

C502

C510

C504

C508

R510

C307

C306

R405

R404

R502

R504

C405

C515

C516

C703

C704

C707

C708

R792

R604

R803

R972

R347

C310

R348

C311

R349

C514

C601

C602

3 4

8 12 11 13

R973

R501

R503

R506

R507

R701

R702

R707

R708

R802

R958

C509

R491

R492

R793

R791

C517

R509

1 4

B
E

B E

D302

Q705

Q302

Q401

Q701

Q702

Q703

Q704

D304

D305

IC9

IC10

IC3

IC7

SW5V

R493

W97

C511

W98

W99

803

C513

C817

C818

W67

W71

R703

R704

R709

R710

W75

W70

W69

W90

C308

W66

C603

C701

C702

C705

C706

C814

C813

W95

W101

C403

R209

W308

R323

R329

R333

R334

R336

R337

R338

R339

R341

R343

R344

R345

R346

W74

R508

R601

R602

R603

R605

R606

R607

R608

R609

R610

R611

R612

R705

R706

R711

R712

W89

W73

W68

W78

W79

W77

W96

W94

W93

W92

W91

W88

W81

W80

W84

W82

W87

W86

W83

W76

W701

W72

D306

D603

D303

D602

D601

D604

D605

D606

CN4

CN3

A-D

A-CLK

RDS-QUAL

S-METER

Refer to the schematic diagram for the values of resistors
and capacitors.

X34-565x-xx

Ref. No.

Address

IC1

IC2

IC3

IC4

IC6

IC7

IC8

Q11

Q12

Q101

Q102

Q103

Q104

Q105

Q301

Q402

Q701

Q702

Q705

Q901

Q902

Q903

Summary of Contents for KDC-W241AY

Page 1: ...Y33 2840 60 TDF W3041A KDC W3041AY Y33 2840 60 TDF W3041A KDC W3041G Y33 2840 61 TDF W3041G Panel assy KDC W312A AY A64 4290 02 KDC W312G GY A64 4290 02 KDC W312SAY A64 4293 02 KDC W3041GY Y33 2840 61 TDF W3041G KDC W312A Y33 2840 62 TDF W312A Panel assy KDC W241AY W241GY A64 4292 02 Panel assy KDC W3041xx A64 4289 02 KDC W312AY Y33 2840 62 TDF W312A KDC W312G Y33 2840 63 TDF W312G DC cord E30 642...

Page 2: ...NER FRONT END ANT DECODER RDS IC7 SW5 E2PROM SW5 BU MECHA CD PRE OUT MUTE BU5 SW5 F AUX J2 PANEL DET Rx2 1 4W IC1 BU5 SW5 SW14V FL B IC4 POWER SUPPLY IC FL B J3 BU5 IC10 VFD DRIVER Q8 9 Q7 ELECTRIC UNIT X34 SWITCH UNIT X16 VREF 8EJE SW 12EJE SW LOS SW LOE SW MOTOR LO EJ A GND A8V A B C E F TR OUT FO OUT DM OUT FM OUT A3 3V LD SIGNAL S GND S7 5V FO OUT TR OUT DM OUT FM OUT DRV MUTE SO SRAMSTB SI BU...

Page 3: ...surge voltage is detected Q103 BU DET ON when the base goes Hi during BU is applied Q104 105 Mute Control ON when the base goes Hi Q301 Panel 5V SW ON when the base goes Lo Q402 Quick Charge Voltage SW Charges voltage quickly when the base goes Hi Q701 702 Pre out Mute SW When a base of the 4 transistors goes Hi pre out is muted Q705 Mute Driver for Pre out ON when the base goes Lo Q901 DC Offset ...

Page 4: ...om 3 3V to 5V Q13 Inverter Inverts ZDET signal D1 Level Down Lowers signal level by about 1 2V so that Lo level signal that turns the regulator ON OFF surely becomes Lo judgment level of the regulator SW D2 Laser Diode Protection Prevents reverse bias which is applied to laser Laser destruction prevention D3 4 Static Electricity Countermeasure Prevents malfunction by static electricity COMPONENTS ...

Page 5: ...PROM writing request H Writing 22 23 NC Not used Output L fixed 24 PON FL O Key illumination power supply control ON H OFF L 25 NC Not used Output L fixed 26 PON PANEL I O Panel 5V control ON L Momentary power down Panel detached Hi Z 11 minutes after ACC OFF Hi Z 27 28 NC Not used Output L fixed 29 AUD SCL I O E VOL clock output 30 AUD SDA I O E VOL data input output 31 VFD SYS DATA O VFD data ou...

Page 6: ...ck charge control L OFF Hi Z Quick charge When IC2 is in source select Hi Z Mute L L Momentary power down Power OFF L 68 MUTE I O Mute L Mute OFF Hi Z Mute ON 69 ANALOG CON O AUX LX audio switching AUX H Switches after 100ms after first out mute begins to work LX Other source L 70 LX RST O Forced reset to slave unit H Reset L Normal 71 LX CON O Start up request to slave unit H Slave unit ON L Slav...

Page 7: ...ruth value table 92 PS1 1 O Power supply IC control r Refer to the truth value table 93 PS1 2 O Power supply IC control r Refer to the truth value table 94 PS1 3 O Power supply IC control r Refer to the truth value table 95 NC Not used Output L fixed 96 AVSS 97 REF CON O VREF control Connects to VREF 98 VREF 99 AVCC 100 LX DATA S I Data from slave unit Pull down GND MICROCOMPUTER STERMINAL DESCRIP...

Page 8: ...change the LINE MUTE inhibition time from 10 seconds to 1 second When operating in the test mode even if a DC offset error occurs detection information is not written in the E2PROM When operating in the test mode CD mechanism error log information clear mode and DC offset error detection information clear mode do not perform DEMO mode operations Also do not display DEMO ON OFF option items in the ...

Page 9: ...leared only for displayed media 5 Disc EJECT times display E J C X X X X X Disc EJECT times display MAX 65535 times 5 While disc EJECT times is displayed press and hold for 2 seconds or longer to clear disc EJECT times 6 Panel open close times display P C X X X X X PANEL open close times display MAX 65535 times 6 Press the key for more than 2 seconds while the PANEL open close count is displayed a...

Page 10: ...ors is displayed in case there is no error E J E R R 2 X X Ejection error switch 2 XX Number of errors is displayed in case there is no error E J E R R 3 X X Ejection error switch 3 XX Number of errors is displayed in case there is no error E J E R R 4 X X Ejection error switch 4 XX Number of errors is displayed in case there is no error CD time code error count data display Missing counts C N T L...

Page 11: ... shown below Key Description of display Description 6 K3I Forced switching F M 1 9 8 1 A AUTO F M 1 9 8 1 W Forced WIDE F M 1 9 8 1 M Forced MIDDLE F M 1 9 8 1 N Forced NARROW RDS auto measurement Add the process to replace the visual inspection of PS display previously done in the production line Status Display Description PS data reception R D S T E S T If displayed as shown at the left force to...

Page 12: ...02A Audio related test mode Procedure Note Press the AUD key main unit Press the AUD and keys Remote control Enter audio adjustment mode the initial item should be Fader and then Balance Bass Level Middle Level Treble Level SW Level System Q V Offset LPF Sub Woofer means all models other than KDC W241AY W241GY About audio adjustment items include both Audio Function Mode and Audio Setup Mode Proce...

Page 13: ...offset error information Clearing E2PROM data Status Display Description While pressing and holding 2 key and 5 key reset start C D O At normal termination C D X At abnormal termination While is displayed power can be ON for 30 minutes This mode is cancelled by resetting The last screen will not be retained Data to be cleared is shown below CD mechanism information CD mechanism error log display D...

Page 14: ... E2PROM of the mother unit X34 and for saving data to the new front end A1 Refer to ROM data transfer processes on the next page for details on front end A1 replacement procedures and on the data to be transferred Procedure Display Description While pressing and holding 1 key and 3 keys reset start All lights ON Press B BOOST key MENU R O M R E A D MENU mode Press key or key R O M R E A D Front en...

Page 15: ...r adjustment data for new front end A1 is supplied as a service part in which data was inserted Data to be copied ROM correction data Other data Security data DEMO MODE ON OFF status POWER ON time For maintenance Playback time For maintenance EJECT count For maintenance Panel open close count For maintenance CD I2C status For maintenance CD offset error code For maintenance CD sound skips count Fo...

Page 16: ... OK2 R O2 Press key Exit ROM data transfer mode Turn power off Remove front end A1 FRONT END A1 E2PROM Mother unit X34 r Install new front end A1 No ROM correction or other data status FRONT END A1 E2PROM E2PROM Mother unit X34 t Turn power on Press and hold the 1 and 3 keys and press reset button Enter the system in the test mode Press B BOOST key Start transferring ROM data Press or Select WRT P...

Page 17: ...PROM that has been updated with ROM correction FRONT END A1 E2PROM E2PROM Mother unit X34 w Turn power on Press and hold the 1 and 3 keys press reset button Enter the system in the test mode Press B BOOST key ROM data System enters data transfer mode Press or Select WRT Press key for 1 second or longer Data transfer FRONT END A1 E2PROM E2PROM Mother unit X34 e WRT OK1 W O1 In case of 4 In case of ...

Page 18: ...M correction or other data status FRONT END A1 E2PROM E2PROM Mother unit X34 t Turn power on Press and hold the 1 and 3 keys press reset button Enter the system in the test mode Press B BOOST key Enter the system in ROM data transfer mode Press or Select WRT Press key for 1 second or longer Data transfer FRONT END A1 E2PROM E2PROM Mother unit X34 y WRT OK W OK Press key Exit ROM data transfer mode...

Page 19: ...WITCH UNIT X16 617x xx J76 0455 02 R61 R34 R33 R78 R75 C15 C10 R74 R70 C21 R72 R81 R80 R18 R19 R11 R16 R15 R14 R13 R17 R96 R32 C25 C24 R23 R22 CP11 CP12 R31 C12 C11 R21 R62 61 60 80 1 20 21 40 41 1 19 20 2 SW5V FIL FIL TDF DET AUX GND AUX L AUX R KI2 KI4 KI1 KI5 KI3 KS4 KS1 KS2 GARD ILL D GND PAN5V FL B ESD GND J1 D78 D79 D77 D71 D75 D74 D73 D72 D76 IC1 SWITCH UNIT X16 617x xx J76 0455 02 PC BOARD...

Page 20: ...Q103 Q104 Q105 D801 Q801 D102 D104 Q3 Q7 Q9 Q901 Q902 Q903 D301 IC1 IC8 IC2 IC3 ELECTRIC UNIT X34 565x xx J76 0513 12 W14 W100 W304 W102 W54 W802 W18 C7 W55 R109 W30 W20 W301 W52 C2 C5 C6 C15 C401 W803 C809 C817 C818 C805 C807 C819 C820 C816 W36 W48 W47 W26 W27 W28 W45 R101 1 16 8 9 R102 R106 W21 R116 R219 W305 R208 W W46 C301 C302 W66 C814 C813 C815 C901 C902 C1 W42 W43 L1 R1 W15 R2 R11 W5 R3 R15...

Page 21: ...11 W98 W99 803 C513 C817 C818 W67 W71 R703 R704 R709 R710 W75 W70 W69 W90 C308 W66 C603 C701 C702 C705 C706 C814 C813 W95 W101 C403 R209 W308 R323 R329 R333 R334 R336 R337 R338 R339 R341 R343 R344 R345 R346 W74 R508 R601 R602 R603 R605 R606 R607 R608 R609 R610 R611 R612 R705 R706 R711 R712 W89 X3 W73 W68 W78 W79 W77 W96 W94 W93 W92 W91 W88 W81 W80 W84 W82 W87 W86 W83 W76 W701 W72 J3 D306 D603 A1 J...

Page 22: ... Q R S T 1 2 3 4 5 6 7 R219 R220 R223 C100 R61 C44 C49 C52 C61 C41 C53 C62 C64 C91 C25 R48 R49 R50 C39 C50 C51 C33 C34 X1 R45 R60 C103 S1 S2 S3 D4 CD PLAYER UNIT X32 5970 02 J76 0443 02 PC BOARD COMPONENT SIDE VIEW Refer to the schematic diagram for the values of resistors and capacitors ...

Page 23: ...R222 R226 R228 R227 R229 R230 R233 R240 C97 C24 C54 C63 C71 C58 C90 R59 C69 C68 R51 C89 R52 C21 C27 C35 C45 C46 R23 C60 R241 R248 R243 C96 C102 C30 C31 C32 C38 C72 CP7 R32 R38 R55 R252 R216 R217 C20 C22 C26 C36 C47 C48 R246 R27 R20 R21 R22 R25 R26 C87 C88 R29 R30 R31 R33 R34 R35 R36 R37 C23 R83 R46 R82 R247 R40 R41 R28 C94 C95 MOTOR LO EJ BU5V A GPIN IPF CCE PIO0 1 3 5 4 5 4 1 3 G I 15 30 16 50 51...

Page 24: ... TP68 TP65 TP70 TP78 TP91 TP98 X3 4 332MHz TP113 TP345 TP75 TP551 TP552 22K R709 22K R710 180 R711 180 330 R707 R708 C706 10u35 C705 1 2 3 L GND R R712 330 10u35 R704 180 R706 22K 180 R703 22K C702 10u35 330 R701 R705 C701 10u35 0 R958 R791 0 W701 0 R792 0 R793 330 R702 FL FR RR RL 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 RFGND ANTINPUT NC AM B OSCGND VT COM B IFC SDA SCL D G...

Page 25: ...12 100K R909 100K R910 100K R913 100K R914 100K 3 W802 R802 C807 C805 77 C809 R804 10 R808 4 3K R807 W801 78 R805 R806 0 R963 22K R406 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 LX DATA M LX CLK NC NC NC REMO NC BYTE CNVSS XCIN XCOUT RESET XOUT VSS XIN VCC1 NMI PANEL DE NC NC ROMCOR NC NC PON FL NC PON PAN NC PWIC BEE AUD SCL AUD SDA 100K R202 47K R201 18P C20...

Page 26: ... 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 LX DATA S AVCC VREF REF CON AVSS PON PS1 3 PS1 2 PS1 1 PS2 1 PS2 2 OFFSET DET LINE MUTE PWIC DC DET TYPE 2 TYPE 1 TUN SMETER RDS NOISE NC NC BU DET ACC DET PWIC MUTE PWIC STBY PWIC SVR LX REQ S RDS CLK LX REQ M LX MUTE LX CON LX RST ANALOG CON MUTE PON EXT GND TUN IFC OUT RDS AFS M VSS NC VCC2 RDS QUAL RDS DATA DSI NC ROTARY CW ROTARY CCW CD DISC...

Page 27: ... YES YES YES YES 47K YES YES YES 2 2K YES 47K YES 2 2K 2 2K 47K 47K YES YES YES YES YES YES YES YES YES YES YES YES YES 2 2K 2 2K 2 2K 47K 47K 47K YES YES YES 2 2K 2 2K 2 2K 47K 47K 47K YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES 150K 330 150K 10K 150K YES YES 150K 150K YES 150K 330 10K 10K 10K 150K 150K 330 330 YES YES 150K 150K 150K YES 150K 150K 150K 10K 10K 10K 150K 150K 15...

Page 28: ...S3 KS2 KS1 S2 S3 S8 S5 S6 S7 S9 S10 S11 S15 S12 S13 S14 S16 TP47 TP46 TP49 TP48 1 C21 FL B FL B 220 R13 220 R15 1 C10 28 27 32 30 29 31 34 33 36 35 40 38 37 39 41 43 42 58 47 45 44 46 50 48 49 52 51 53 54 55 57 56 61 59 60 63 62 64 TP165 R80 24 65 66 12 13 5 10 11 9 7 8 6 4 2 3 1 S8 S7 S9 S10 S13 S11 S12 S14 S15 S6 S5 S29 S41 S50 S51 S52 S49 S47 S48 S45 S46 S44 G3 S43 G1 S42 G3 S39 S38 S37 S36 S35...

Page 29: ...P49 VOL ILLUMI TP172 TP174 No 13 18 21 B30 1779 05 B30 1781 05 B30 1781 05 B30 1779 05 B30 1780 05 B30 1779 05 B30 1780 05 B30 1779 05 B30 1780 05 B30 1780 05 B30 1566 05 R61 E8 KDC W241AY E9 KDC W241GY K1 KDC MP238CR M4 KDC MP339 KDC W3041G GY E1 E5 KDC MP239 M2 KDC W312G GY E3 E7 KDC W3041A AY KDC MP339S E E4 M5 KDC W312A AY E2 E6 B30 1779 05 YES 0 22 YES 0 11 B30 1780 05 B30 1566 05 B30 1780 05...

Page 30: ...8 2200P OUT NIS 3 R220 4 7K C87 2200P R223 10K 45 C97 0 1 DGND 10K R216 PIO0 AOUT2 AOUT3 PIO2 48 50 49 PIO1 47 46 IRQ 24 25 4 7K R239 C100 1 34 TEST BUCK BUS3 BUS2 BUS1 BUS0 SRAMSTB VDDM1 VDD1 2 44 43 CCE 42 41 40 37 39 38 RST 36 35 VSS2 VDDT3 1 DVSS3 2 DVDD3 DVSS3 1 33 32 31 30 29 LO DVR 28 27 26 RO XVDD3 XO C54 1 22P C23 27K R23 5 6K R22 SLD SLD SLED OUT LOAD EJECT SLED IN SPDL SPDL SPDL SPDL 16...

Page 31: ... 80 C30 0 01 C32 0 01 3300P C34 0 1 A3 3V RFI AGND Vref ARF VSS1 18 19 20 21 22 23 24 25 TEST BUCK BUS3 BUS2 BUS1 BUS0 SRAMSTB VDDM1 VDD1 2 CCE RST VSS2 VDDT3 1 DVSS3 2 DVDD3 DVSS3 1 LO DVR RO XVSS3 XVDD3 XO XI IO0 IO1 FGIN C54 1 C53 0 1 16 934MHz X1 C52 0 1 10 11 12 13 14 15 16 17 2 VSSP3 VDDP3 VDD1 1 VCOI DMO VREF FMO 6 AVDD3 8 FOO TRO 9 TEZI 7 4 FEI TEI 5 RFRP SBAD 3 92 TESTR VRO RFEQO RFRPI VM...

Page 32: ... 6108 15 N09 6155 15 φ2x8 M1 6x6 0 M1 7x2 5 M2x2 φ2x5 BLK 1 6 WASHER M2x2 φ2x3 5 φ2x6 858 K K 52 F X32 DM1 14 24 DFPC1 28 25 16 29 19 31 26 13 12 10 30 27 42 11 17 18 23 45 38 DM2 1 850 849 806 834 807 44 39 40 15 22 G 55 51 8 33 809 36 33 Jx2 H 5 37 53 2 37 43 43 56 37 F F 37 43 43 E Cx2 41 32 35 Ax2 DPU1 B EXPLODED VIEW CD MECHANISM Parts with the exploded numbers larger than 700 are not supplie...

Page 33: ... J N24 3015 48 N80 2006 48 N80 2012 43 N83 3005 48 N86 2610 48 N80 3010 48 N83 3005 48 N83 3020 48 N86 2606 48 D Dx2 Hx2 Ex2 C C Cx2 A F H G 772 D D D B B F J X34 786 732 701 PA1 241 708 253 238 252 705 771 255 257 259 258 256 210 226 725 206 204 237 222 236 221 224 207 242 269 209 223x2 DC1 Parts with the exploded numbers larger than 700 are not supplied ...

Page 34: ...TEM CARTON CASE E5 H54 4178 03 ITEM CARTON CASE E6 H54 4179 03 ITEM CARTON CASE E7 H54 4180 03 ITEM CARTON CASE E8 H54 4181 03 ITEM CARTON CASE E9 H54 4182 03 ITEM CARTON CASE F 241 3C J19 7186 01 HOLDER 242 1C J21 9716 03 MOUNTING HARDWARE ASSY 252 3C K24 4783 04 PUSH KNOB EJECT 253 3C K24 4786 04 PUSH KNOB RELEASE 255 3C K25 1906 02 PUSH KNOB PRESET 256 3C K28 0272 04 KNOB ASSY VOL 257 3C K24 47...

Page 35: ...K CHIP C 2200PF K C89 91 C93 1451 05 CHIP C 0 10UF K C94 95 CK73GB1A105K CHIP C 1 0UF K C96 CK73GB1H103K CHIP C 0 010UF K C97 C93 1451 05 CHIP C 0 10UF K C100 101 CK73GB1A105K CHIP C 1 0UF K C102 CK73FB1A225K CHIP C 2 2UF K C103 CK73GB1H153K CHIP C 0 015UF K CN1 E41 2612 05 FLAT CABLE CONNECTOR CN2 E41 2083 15 FLAT CABLE CONNECTOR X1 L78 1221 05 RESONATOR 16 93MHZ CP7 RK74GB1J103J CHIP COM 10K J 1...

Page 36: ...H1H331J CHIP C 330PF J E2E3F C514 CC73GCH1H331J CHIP C 330PF J E4E5E6 C514 CC73GCH1H331J CHIP C 330PF J E7EE1 C515 516 CC73GCH1H270J CHIP C 27PF J E2E3F C515 516 CC73GCH1H270J CHIP C 27PF J E4E5E6 C515 516 CC73GCH1H270J CHIP C 27PF J E7EE1 C517 CC73GCH1H561J CHIP C 560PF J E2E3F C517 CC73GCH1H561J CHIP C 560PF J E4E5E6 C517 CC73GCH1H561J CHIP C 560PF J E7EE1 C701 702 CD04AB1V100M ELECTRO 10UF 35WV...

Page 37: ...20 RK73GB2A472J CHIP R 4 7K J 1 10W R330 RD14BB2C101J RD 100 J 1 6W R331 RK73GB2A392J CHIP R 3 9K J 1 10W R332 RD14BB2C101J RD 100 J 1 6W R333 334 RD14BB2C102J RD 1 0K J 1 6W E2E3F R333 334 RD14BB2C102J RD 1 0K J 1 6W E4E5E6 R333 334 RD14BB2C102J RD 1 0K J 1 6W E7EE1 R334 RD14BB2C102J RD 1 0K J 1 6W E8E9 R335 RK73GB2A473J CHIP R 47K J 1 10W R336 339 RD14BB2C222J RD 2 2K J 1 6W R340 RK73GB2A225J CH...

Page 38: ...104 D1F60 5063 DIODE D105 MTZJ4 7 B ZENER DIODE D106 108 MTZJ6 8 B ZENER DIODE D109 1SS133 DIODE D110 BAV70W DIODE D301 DA204U DIODE D304 UDZW6 8 B ZENER DIODE D305 306 MTZJ6 8 B ZENER DIODE D401 1SS133 DIODE D404 1SS133 DIODE E2E3F D404 1SS133 DIODE E4E5E6 D404 1SS133 DIODE E7EE1 D801 1SS133 DIODE D803 1SS133 DIODE D901 MTZJ4 7 B ZENER DIODE IC1 30622MEPB44FP MICROCONTROLLER IC IC2 E TDA7419 ANAL...

Page 39: ...2B G02 1399 14 FLAT SPRING 45 2B G02 1547 14 FLAT SPRING 51 1A J22 0473 21 MOUNTING HARDWARE 52 3B J22 0474 12 MOUNTING HARDWARE 53 1B J22 0519 13 MOUNTING HARDWARE 55 1A J90 1138 41 GUIDE 56 1B J90 1023 03 GUIDE DPC1 3A J86 0039 05 FPC LEAD FREE A 2B N09 4460 15 TAPTITE SCREW PT2X8 B 1B N09 6317 05 TAPTITE SCREW 1 6X6 0 C 2B N09 6004 15 MACHINE SCREW M1 7X2 5 E 2B N09 6007 15 MACHINE SCREW M2X2 F...

Page 40: ... 1Bit Spindle speed 500 200rpm CLV Wow Flutter Below Measurable Limit Frequency response 1dB 20Hz 20kHz Total harmonic distortion 1kHz 0 01 Signal to Noise ratio 1kHz 105dB Dynamic range 93dB MP3 decode Compliant with MPEG 1 2 Audio Layer 3 WMA decode Compliant with Windows Media Audio Audio section Maximum output power 50W x 4 Full Bandwidth Power at less than 1 THD 30W x 4 Speaker Impedance 4 8Ω...

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