Kenwood KRC-478R Service Manual Download Page 1

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CASSETTE RECEIVER

KRC-478R/RV/RY/RYV

SERVICE MANUAL

KRC-478R/RV/RY/RYV (E)

MECHANISM EXTENSION CORD

W05-0477-00 (7P)

W05-0609-00 (10P)

SRC

PWR
OFF

LOUD

EJECT

/ PTY

VOL ADJ

CLK

NAME.S

SCAN

B.S/RDM

REP

D.SCN

M.RDM

KRC-478R

40W 4

CD MD-CHANGER CONTROL

DISC

ANTENNA ADAPTOR
(T90-0523-05)

PLASTIC CABINET ASSY
(A02-1486-13)

LEVER
(D10-xxxx-xx) x2

MOUNTING HARDWARE ASSY
(J21-9491-03)

(Refer to the parts list.)

DC CORD
(E30-4792-05)

(KRC-478R/RY only)

40%

Summary of Contents for KRC-478R

Page 1: ...W05 0477 00 7P W05 0609 00 10P SRC PWR OFF TI LOUD EJECT PTY VOL ADJ MENU CLK NAME S SCAN B S RDM REP D SCN M RDM KRC 478R 40W 4 X CD MD CHANGER CONTROL DISC DISC ANTENNA ADAPTOR T90 0523 05 PLASTIC CABINET ASSY A02 1486 13 LEVER D10 xxxx xx x2 MOUNTING HARDWARE ASSY J21 9491 03 Refer to the parts list DC CORD E30 4792 05 KRC 478R RY only 40 ...

Page 2: ... GND FM B AM B OSC GND OSC GND OSC GND VT PLL B IFC OUT SDA SCL DIG GND IF1 B IF1 GND S METER IF2 GND SD FM B SUB SUB PON ACC DET B U DET SCL MUTE SDA P CON PANEL RESET L RESET L CLK L DATA S L DATA L DSI FWD REV T MODE MOTOR CH CON DATA H DATA C REQ H REQ C CH CLK Rch COM Lch TAPE MP IN AM MPX OUT RR OUT LR OUT RF Rch LEVEL SCL SDA OUT LF Rch STBY MUTE Rch Lch PACK T END SYBY MODE FWD REV B U 5V ...

Page 3: ...ls Q15 s protection circuit effected by C9 time constant and Q14 s inner base resister Q15 P CON PROTECTION CIRCUIT Stops output signal and makes Q16 s base level H when P CON output comes GND shorted Q16 17 P CON SW Outputs the back up 14V when Q17 s base level comes H Q18 ACC DETECTION Corrector level comes L when ACC comes ON Detection voltage 8 95V Q19 BACK UP DETECTION Corrector level comes L...

Page 4: ...ock input and output 19 L CE O LCD driver data control Active H 20 SUB O Sub motor control signal output 21 SUB O Sub motor control signal output 22 MS CONT O No audio signal detection level switch to equalizer amplifier H PLAY L FF REW 23 EQ MUTE O Mute control signal output to equalizer amplifier H FF REW or the other source L TAPE PLAY 24 PLL SCL O Communication clock signal output to the front...

Page 5: ... supply control signal output H Power ON L Power OFF 58 59 60 RESET I System reset signal input L Reset H The other condition 61 REMOTE I Data input from the remote controller 62 R CLK I Data clock input from RDS decoder 63 CH REQ C I Request input signal from the changer 64 PACK IN I Insertion detection signal input from cassette mechanism H Pack in L Pack out 65 KEY REQ I Key request Active L 66...

Page 6: ...e eject function works 3 How to release the test mode Simply reset the unit NOTE The test mode is not canceled by ACC OFF power OFF momentary power down or the panel off 4 Audio adjustment Set the volume level to 10dB which is shown as 30 on the display Loudness OFF The BASS TREBLE and BALANCE FADER can be set to the full boost full cut and full front full rear each by pressing the Track UP Track ...

Page 7: ...PUT SETTINGS RECEIVER SETTINGS ALIGNMENT POINTS ALIGN FOR FIG CASSETTE DECK SECTION 1 AZIMUTH TCC 153 10KHz B TAPE PLAY Head azimuth screw FWD REV ME1 Adjust so that output level in playing FWD and REV becomes maximum each b b AZIMUTH PANEL FRONT FWD REV FM SG MPX SG AC Voltmeter Oscilloscope FM SG AM SG A B C D REAR VIEW ...

Page 8: ...V 8 KRC 478R RV RY RYV PARTS DESCRIPTIONS ...

Page 9: ...MTR IC2 SDA PLL SDA RXD PLL SCL TXD IC2 SCL SD DIG GND VDD 5V TYPE 0 AUDIO G X86 C1 L1 W52 W55 W56 C253 W51 W61 L9 C318 W60 R21 X1 C314 C306 C301 R301 C310 C7 C305 C319 L10 C223 L3 W59 C2 C252 R9 C257 C226 C213 C201 C309 L8 R10 R16 C216 R8 W54 W57 R13 R15 W65 C203 W63 C261 C262 C263 C264 W64 C258 C251 R23 R17 X3 C11 L13 R11 C5 C9 R216 C8 C266 C255 C4 C265 C267 C110 R210 C254 L2 C256 R L 1 5 9 2 6 ...

Page 10: ...16 C318 C314 SD IC2 SCL 4 332MHz R203 R202 X3 E B C7 R7 R301 C313 C301 W57 B R17 E B E C9 C11 E R27 R28 C14 R20 R24 E B C12 C13 R19 C16 R29 B R26 R25 W56 W55 W54 1 R261 R8 R9 W59 C15 1 14 C8 L3 C203 7 C201 C251 8 B E R251 L1 W60 W61 R262 C258 W63 R256 R254 E C223 C315 R324 C305 5 1 C319 C309 10 6 10 R319 R321 21 20 10 11 R305 31 30 40 R306 1 C310 C205 C204 AUDIO C206 C207 R204 C210 1 R206 R205 C30...

Page 11: ...GND GND B U B U B U RL RL FL FL FR FR RR RR RL RL FL FL FR FR RR RR ACC B U ACC B U B U ACC B U GND VDD 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 RESET N C N C P ON SW5 N C CH CON CH REQ H B U DET ACC DET BEEP N...

Page 12: ... 22K C260 0 01 1 2 3 2 1 3 C263 10u16 R269 360 C264 10u16 360 R270 R273 180 R271 22K 22K R272 R274 180 L8 4 7uH 0 01 C228 4 7K R219 1K R218 64 30 77 15 12 14 11 C213 C214 IC8 Q54 55 79 Lch Rch 4 332MHz R PBOUT R DIN R 5 6 7 3 10 S R MSGV VCC MAOUT 19 MSGV R 20 14 M OUT L PBOUT L RAI L NFI L FIN R 1 RF GND 23 SD 24 25 26 30 31 36 47u10 C226 0 01 C225 4 7uH L10 R216 150 22K R212 22K R214 1K R211 L13...

Page 13: ... KS3 KS2 KS1 COM3 COM2 COM1 S55 S54 S53 S52 S51 S50 S49 S48 S47 S46 S45 S44 S43 S42 S41 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 GREEN AMBER KEY S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 KI1 KI2 KI3 KI4 KI5 VDD VDD1 VDD2 VSS TEST OSC RES DATAL CE CL DATAS KI1 KI2 KI4 KI3 C3 0 047 C1 820P C2 0 047 R7 68K C4 0 01 R21 4 7 R8 1K R9 47K 79 80 7...

Page 14: ...08 N09 4200 08 N09 4201 08 N19 2087 08 N19 2088 08 N19 2089 08 N19 2146 08 N19 2091 08 N19 2092 08 N29 0510 08 D40 1081 25 MECHANISH 4 73 27 2 55 76 a M1 63 79 52 79 6 52 74 74 45 16 16 13 13 17 45 67 8 40 41 77 9 68 1 37 19 10 107 38 94 95 80 15 18 53 83 62 23 22 59 35 46 42 69 36 7 47 48 103 105 100 102 3 HD1 33 75 32 34 26 24 M2 70 25 71 44 39 57 14 43 G R R T L M Q Q L M Ex2 M M 887 C L L L P ...

Page 15: ... E 3x5 M3x8 3x8 M3x12 M2 6x8 BLK C B Dx2 Dx2 A 261 DC1 KRC 478R RY only 221x2 201 248 229 F1 A 1 232x2 X14 X14 210 205 791 767 789 X14 786 706 247 238 224 223 236 239 216 X14 J 2 X14 WH1 X14 290 x2 X14 287 703 727 208 731 Refer to the following page 222 X14 N83 3005 46 N30 3008 46 N80 3008 46 N30 3012 46 N30 2608 45 ME1 1 2 3 C D 20 EXPLODED VIEW UNIT ...

Page 16: ...C 478R RV RY RYV E E E E 2x8 BLK 2x6 F G X13 F F F Fx2 712 See parts list N80 2006 46 766 207 272 X13 275 X13 281 X13 281 X13 273 KRC 478RV RYV only X13 271 X13 ED1 X13 784 256 226 246 237 252 X13 254 251 257 253 255 PA1 217 1 2 3 E F 21 KRC 478R RV RY RYV EXPLODED VIEW UNIT K ...

Page 17: ...UCTIVE RUBBER C9 CK73FB1C104K CHIP C 0 10UF K 229 2D E30 4801 05 CORD WITH PINPLUG DC1 1C E30 4792 05 DC CORD EE3 281 2E E29 1575 04 CONDUCTIVE RUBBER J1 E59 0828 05 RECTANGULAR PLUG 232 2D F29 0049 05 INSULATING COVER F1 2D F52 0006 05 FUSE MINI BLADE TYPE 10A R1 2 RK73FB2A102J CHIP R 1 0K J 1 10W F1 2D F52 0011 05 FUSE MINI BLADE TYPE 10A E3E2 R3 RK73FB2A471J CHIP R 470 J 1 10W R4 RK73FB2A101J C...

Page 18: ...H151J CHIP C 150PF J C 2D N80 3008 46 PAN HEAD TAPTITE SCREW C212 CK73FB1E333K CHIP C 0 033UF K D 1D N30 3012 46 PAN HEAD MACHINE SCREW C213 C90 2592 05 ELECTRO 10UF 6 3WV C214 CC73FCH1H271J CHIP C 270PF J R1 RK73FB2A223J CHIP R 22K J 1 10W C215 CK73FB1H103K CHIP C 0 010UF K R2 RK73FB2A101J CHIP R 100 J 1 10W R3 RK73FB2A473J CHIP R 47K J 1 10W C216 C90 2592 05 ELECTRO 10UF 6 3WV R4 RK73FB2A222J CH...

Page 19: ...2A473J CHIP R 47K J 1 10W R328 RK73FB2A104J CHIP R 100K J 1 10W R155 RK73FB2A473J CHIP R 47K J 1 10W EE3 R329 RK73FB2A471J CHIP R 470 J 1 10W R156 RK73FB2A473J CHIP R 47K J 1 10W E1E2 R330 RK73FB2A104J CHIP R 100K J 1 10W R201 RK73FB2A222J CHIP R 2 2K J 1 10W R351 RK73EB2B102J CHIP R 1 0K J 1 8W R202 RK73FB2A102J CHIP R 1 0K J 1 10W R356 RK73EB2B101J CHIP R 100 J 1 8W R203 205 RK73FB2A472J CHIP R ...

Page 20: ... D10 4116 18 SLIDER Q14 DTA124EK DIGITAL TRANSISTOR 24 1B J21 7780 08 MOUNTING HARDWARE Q14 UN2112 DIGITAL TRANSISTOR E3E2 Q15 2SA1037K TRANSISTOR 25 1B D10 4117 18 ARM Q16 2SB1277 Q R TRANSISTOR 26 1B D10 4118 08 SLIDER Q17 DTC114YK DIGITAL TRANSISTOR 27 1A A52 0716 08 HOLDER 31 3B J21 7781 08 MOUNTING HARDWARE Q17 UN2214 DIGITAL TRANSISTOR E3E2 32 1B J90 0767 08 GUID Q18 19 2SC2412K TRANSISTOR Q...

Page 21: ...1 08 TENSION COIL SPRING 83 3A D16 0609 08 BELT 94 3A S64 0807 08 LEVER SWITCH 95 3A S64 0808 08 LEVER SWITCH 100 2B E30 4460 08 CONNECTOR ASSY 10P 102 2B T95 0213 08 PHOTO COUPLER 103 2B S62 0858 08 SLIDE SWITCH 105 2B S74 0813 08 LEAF SWITCH 107 3A E30 4468 08 CONNECTOR ASSY 7P A 1B N09 4193 08 SCREW B 1B N09 4194 08 SCREW C 3A N09 4195 08 SCREW D 1B N09 4196 08 SCREW E 2A N09 4197 08 SCREW F 1B...

Page 22: ...KRC 478R RV RY RYV 27 ...

Page 23: ...yde N S W 2113 Austraria KENWOOD ELECTRONICS HONG KONG LTD Unit 3712 3724 Level 37 Tower 1 Metroplaza 223 Hing Fong Road Kwai Fong N T Hong Kong KENWOOD ELECTRONICS GULF FZE P O Box 61318 Jebel Ali Dubai U A E KENWOOD ELECTRONICS THAILAND CO LTD 2019 New Pechburi Road Bangkapi Huaykwang Bangkok 10320 Thailand KENWOOD ELECTRONICS SINGAPORE PTE LTD 1 Genting Lane 07 00 Kenwood Building Singapore 349...

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