Kenwood KDC-V7521/Y Service Manual Download Page 1

Page: 1 / 23

CD RECEIVER

KDC-V7521/Y

SERVICE MANUAL

Escutcheon assy
(B07-3007-03)

Front glass
(B10-4161-01)

Panel assy
(A64-2582-02)

KDC-V7521/Y

This service manual does not include information on the CD mechanism assembly (exploded view, parts list,
schematic diagram or mechanism operation description).

For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X,
: B51-7867-00).

DC cord
(E30-4942-05): KDC-V7521Y
(E30-4956-05): KDC-V7521

Antenna adaptor
(T90-0523/0534-05)

Screw set
(N99-1704-05)

Lever
(D10-4562-04)
(D10-4621-04):KDC-V7521

Mounting hardware assy
(J21-9716-03)

Torsion coil spring
(G01-2924-04)

Plastic cabinet assy
(A02-1497-13)

Remote controller assy
(A70-2025-05)

Remote controller assy
(A70-0886-15)

Summary of Contents for KDC-V7521/Y

Page 1: ...matic diagram or mechanism operation description For such information please refer to the CD mechanism assembly service manual X92 4030 0X X92 4440 0X B51 7867 00 DC cord E30 4942 05 KDC V7521Y E30 4956 05 KDC V7521 Antenna adaptor T90 0523 0534 05 Screw set N99 1704 05 Lever D10 4562 04 D10 4621 04 KDC V7521 Mounting hardware assy J21 9716 03 Torsion coil spring G01 2924 04 Plastic cabinet assy A...

Page 2: ...I CONVERTER BUFFER NOISE Q36 OUTPUT VOLTAGE CONTROL EX AMP Q14 Q15 Q31 NAVI MUTE PANEL 5V PANEL 5V KEY MATRIX SW14V SRM MECHA SRM DRIVER MOTOR BACK LIGHT V ILL LCD ED1 CH QUAL SERVO B MUTE R STOP SW2 LO EJ MUTE L RST SW3 SW1 SDA SCL A8V BU5V SW5V RST REQ C CLK CH CON DATA H REQ H CD AM FM P MUTE MUTE SW5V PANEL5V L DATAL L CE L CLK L DATAS DA SDA DA SCL REMO RESET ILL B SRM SW1 SRM DET SRM SW2 SRM...

Page 3: ...2 7X X25 8762 72 Ref No Component name Application Function Operation Condition Compatibility IC1 UPD703033GC139 System MI COM IC2 TDA7407D E VOL N C MPX IC IC3 M5237ML AVR IC IC is combined with Q4 and it works as the error detection the driver IC4 TA8273H Power IC HD74HC02FP IC8 or TC74HC02AF Mute logic 2 input NOR x 4 or 74VHC02SJ IC14 TDA7479D RDS decoder IC15 LB1930M Motor driver IC For SRM m...

Page 4: ...r 2SD1819A ACC detection SW While ACC is applied a base goes Hi and Q31 is turned on Q32 DTA124EUA or KRA303 Mute driver for L Ch When BU detection SW or System RESET or MI Q33 DTA124EUA or KRA303 Mute driver for R Ch COM s Pre mute is working a base goes Lo and Q32 and Q33 are turned on Q35 DTC124EUA or UN5212 E VOL mute SW When BU detection SW or MI COM s mute is working a base goes Hi and Q35 i...

Page 5: ...15 16 N C O Not used N C 17 DA SDA DIM CON O Data output to D A converter V LED model Data line with D A converter Dimmer control output Hi Dimmer OFF Pulse wave shape Dimmer ON 18 TEST Test terminal Not used Connected to GND lines 19 P MUTE O Power IC mute control output Lo Mute during POWER OFF ALL OFF TEL MUTE 20 P STBY O Power IC standby control output Lo Power IC OFF Hi Power IC ON ALL OFF mo...

Page 6: ...Standby mode Hi Operation mode 52 ILL ON O Illumination AVR on off control output Hi POWER ON mode except panel detached 53 M MUTE L I Mute request L Ch from CD MECHA MI COM Lo Mute request 54 M MUTE R I Mute request R Ch from CD MECHA MI COM Lo Mute request 55 BVDD Positive power supply connection terminal Connected to BU 5V lines 56 BVSS Ground connection terminal Connected to GND lines 57 M RST...

Page 7: ... detected Hi Not detected 84 85 N C I Not used pull down to GND lines Standby SRM B SRM B Lo Lo 86 SRM B O SRM mechanism submotor control output Clock wise SRM B SRM B Hi Lo Counter clock wise SRM B SRM B Lo Hi Break SRM B SRM B Hi Hi 87 R CLK I Clock input from the RDS decoder IC Except RDS RBDS model Not used pull down to GND lines 88 CH REQC I Request input from changers Lo Request 89 KEY REQ I...

Page 8: ...emote control key is inhibited Bass Middle and Treble are adjusted in 3 steps of Min Center Max with the Track Up Down keys Balance is adjusted in 3 steps of Left Max Center Right Max with the Track Up Down keys Fader is adjusted in 3 steps of Rear Max Center Front Max with the Track Up Down keys HPF is adjusted in 2 steps of Through 220Hz with the Track Up Down keys LPF is adjusted in 2 steps of ...

Page 9: ...y registration mode TRANSMIT1 should be displayed now The dis play at this time should show in place of 3 Point the Mask key remote toward the light sensor and press and hold its key for more than 0 5 second 4 When TRANSMIT2 is displayed press and hold the key on the Mask key remote for more than 0 5 second again The first and second counter codes are not com pared at this time 5 When APPROVED is ...

Page 10: ...R and IR Q4 base voltage VBE R7 From this IR flows in proportion to Q4 base voltage Therefore V I converter will supply current in proportion to the voltage input to red blue and green LED s which vary the brightness of LED s The registor between D1 and V I converter is the protection registor for limiting power supplied to transistors Q4 6 CIRCUIT DESCRIPTION ATTENTION R11 R7 R9 R4 R6 R5 4 7 4 7 ...

Page 11: ...R36 W37 R11 R9 W39 W40 L4 W42 W41 FR E B 13 12 2 1 2 1 12 13 1 8 B E E B E B E B B E B E 24 1 1 3 24 25 2 1 1 6 2 1 1 16 9 8 1 2 7 6 IC2 IC14 IC3 Q2 Q32 Q33 Q35 Q51 Q43 Q45 Q50 Q8 Q7 Q3 Q5 Q6 Q15 Q52 IC1 D30 D31 D32 D15 D18 Q1 Q4 D2 D1 Q9 Q25 Q26 D23 D17 D24 D22 D5 D4 D3 D16 D8 D7 D28 D29 D27 IC4 D12 D11 D33 D34 D14 D41 D38 D39 D40 CN4 CN3 CN6 CN1 CN5 WH1 J1 D35 D36 CN7 Q46 Q44 D62 D61 D63 D64 CN2...

Page 12: ...4 Q10 IC8 IC15 Q38 Q39 Q40 Q37 Q31 Q11 Q12 Q28 Q29 Q30 Q27 Q13 Q24 Q14 Q36 IC16 Q53 D60 D26 D25 X25 9392 7X J74 1398 02 X25 8762 72 J74 1408 02 C53 C50 C57 C54 R55 R58 R61 R52 R11 R9 C67 R64 R65 R66 R63 C66 C65 R62 R18 R17 R19 C7 C6 R23 R21 R20 R22 C58 R14 R15 R16 R27 R28 R13 R4 R5 R6 R1 R2 R3 R7 C59 R12 C61 R8 C60 R10 R50 C64 C63 C3 C5 C4 C2 C62 C68 R68 C1 R67 R51 R53 R54 R56 R60 C13 R59 R57 C14 ...

Page 13: ...37 4 7K 3 3u35 C34 R33 4 7K 4 3 W5 DA SDA ILLMG ILL B RST R233 R234 R236 R235 R237 1 2 4 5 3 6 7 470 1K 4 7K 470 1K REMO DA SCL NC DGND VDD R239 10 8 9 11 12 13 1K 99 65 98 97 64 47K R231 93 11 R43 5 6K R47 18K Q26 29 1 2W 28 C39 0 01 1 2 3 4 100K 0 068 C36 0 1u50 R40 1K R42 12K 1000P C37 C35 R41 12K C48 0 01 14 13 12 R46 C38 47K 0 01 3 3K 1 2W 12 11 5 6 7 10 9 8 1u50 C115 R204 R203 0 47u50 C113 F...

Page 14: ...TYPE0 44 TYPE1 45 ILL ON M MUTE R M MUTE L CD SW3 MOSW LO EJ MC REQ PANEL L CE M RST BVSS BVDD CH RST IC2 TYPE1 47 IC2 TYPE0 48 CH CON 50 CH MUTE 49 72 75 74 73 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 GND EXTRES C143 C144 10u16 0 01 7 8 FILOUT FSEL ARI TM 10 9 0 22 S GND P GND OSCO C142 C141 330P 5 6 3 10u16 4 MPX OSCI OSEL VCC 12 11 VREF C146 X3 13 10P 1 2 82 81 16 QUAL RDD...

Page 15: ...B B B B SCL 470x2 CP56 C6 8 7 6 5 VCC SCL SCA GND 1 2 3 4 A01 A02 A03 NC C5 R12 Q5 4 7 R66 SDA SCL R67 10K R68 10K IC2 Q6 100Kx4 CP55 B G R C67 4 7 C66 4 7 C65 4 7 CP54 100Kx4 C68 1 1 2 4 3 R50 150 R52 220 R51 150 470x2 CP50 R53 150 4 3 2 R54 150 220 R55 1 B R G G R B 1 2 3 4 5 6 470x2 CP51 1 2 3 4 5 6 1 2 3 4 5 6 R62 270 R63 270 B B C50 0 01 C53 0 01 0 01 C52 C58 C59 0 01 0 01 C51 0 01 B 5 1 G R ...

Page 16: ...4400 05 N09 4401 05 N09 4427 05 N09 4448 05 N09 4449 05 N19 2154 04 N19 2155 04 N19 2156 04 N29 0523 05 N29 0522 05 N38 2025 46 N80 2005 46 N80 2008 45 N83 3005 46 N86 2004 45 N80 3008 46 N83 3012 46 N86 2606 46 275 213 282 258 789 200 271 255 285 227x2 232 230 231 233 234 204 263 272 257 203 212 229 219 235 236 228 256 262 205 259 269 237 260 261 286 250x4 749 748 770 206 747 701 202 220 X16 X16 ...

Page 17: ... 10A E1 255 1A G01 2924 04 TORSION COIL SPRING 256 2A G01 3065 04 EXTENSION SPRING 257 2A G01 3066 14 TORSION COIL SPRING Ref No A d d N e w Parts No Description Desti nation Ref No A d d N e w Parts No Description Desti nation KDC V7521 Y 258 3B G01 3069 04 EXTENSION SPRING 259 2A G01 3080 04 TORSION COIL SPRING 260 2A G09 2038 04 FORMED WIRE 261 2A G09 2042 04 FORMED WIRE 262 2A G11 1927 04 CUSH...

Page 18: ... CHIP R 220 J 1 10W R62 65 RK73GB2A271J CHIP R 270 J 1 10W R66 RK73GB2A4R7J CHIP R 4 7 J 1 10W R67 68 RK73GB2A103J CHIP R 10K J 1 10W S28 S70 0864 05 TACT SWITCH D26 MA3082 L ZENER DIODE Ref No A d d N e w Parts No Description Desti nation Ref No A d d N e w Parts No Description Desti nation SWITCH UNIT X16 1XXX XX IC1 LC75808W MOS IC IC2 RS 171 ANALOGUE IC IC3 M62333FP MOS IC Q1 DTA114EUA DIGITAL...

Page 19: ...R3 RK73GB2A223J CHIP R 22K J 1 10W R4 RK73GB2A222J CHIP R 2 2K J 1 10W R5 RD14BB2C221J RD 220 J 1 6W R6 RK73GB2A153J CHIP R 15K J 1 10W R7 R92 3032 05 CHIP R 4 3K D 1 10W Ref No A d d N e w Parts No Description Desti nation Ref No A d d N e w Parts No Description Desti nation R8 R92 3047 05 CHIP R 24K D 1 10W R9 RD14BB2C152J RD 1 5K J 1 6W R10 RK73EB2E2R2J CHIP R 2 2 J 1 4W R11 RD14BB2C102J RD 1 0...

Page 20: ...CHIP R 4 7K J 1 10W R220 221 RK73GB2A104J CHIP R 100K J 1 10W R222 224 RK73GB2A222J CHIP R 2 2K J 1 10W R230 RK73GB2A472J CHIP R 4 7K J 1 10W R231 RK73GB2A473J CHIP R 47K J 1 10W R233 RK73EB2E471J CHIP R 470 J 1 4W R234 RK73EB2E102J CHIP R 1 0K J 1 4W R235 RK73EB2E472J CHIP R 4 7K J 1 4W R236 RK73EB2E471J CHIP R 470 J 1 4W R237 RK73EB2E102J CHIP R 1 0K J 1 4W R238 239 RK73EB2E471J CHIP R 470 J 1 4...

Page 21: ...R Q28 DTA124EUA DIGITAL TRANSISTOR Q28 KRA303 DIGITAL TRANSISTOR Q29 DTC114YUA DIGITAL TRANSISTOR Q29 UN5214 DIGITAL TRANSISTOR Q30 31 2SC4081 TRANSISTOR Q30 31 2SD1819A TRANSISTOR Q32 33 DTA124EUA DIGITAL TRANSISTOR Q32 33 KRA303 DIGITAL TRANSISTOR Q35 DTC124EUA DIGITAL TRANSISTOR Q35 UN5212 DIGITAL TRANSISTOR Q36 2SC4081 TRANSISTOR Q36 2SD1819A TRANSISTOR Q37 40 DTC143TUA DIGITAL TRANSISTOR Q37 ...

Page 22: ...KDC V7521 Y 27 ...

Page 23: ... P O BOX 22745 2201 East Dominguez Street Long Beach CA90801 5745 U S A KENWOOD ELECTRONICS CANADA INC 6070 Kestrel Road Mississauga Ontario Canada L5T 1S8 KENWOOD ELECTRONICS LATIN AMERICA S A P O Box 55 2791 Paitilla Plaza Credicorp Bank Panama Piso 9 Oficina 901 Calle 50 Panama Rep de Panama KENWOOD ELECTRONICS BRASIL LTDA Alameda Ministro Rocha Azevedo No 456 Edificio Jaú 10o Andar Cerqueira C...

Search results

Summary of Contents for KDC-V7521/Y

Reviews:

Related manuals for KDC-V7521/Y

Brands by name

Popular brands

Kenwood KDC-V7521/Y, Service Manual

Search results

Summary of Contents for KDC-V7521/Y

Reviews:

Related manuals for KDC-V7521/Y

Brands by name

Popular brands