Kenwood KRC-478R Service Manual

[Page 1] Kenwood KRC-478R

CASSETTE RECEIVER KRC-478R/RV/RY/RYV SERVICE MANUAL © 1999-11 PRINTED IN KOREA B51-7567-00 (K) 1894 KRC-478R/RV/RY/RYV (E) MECHANISM EXTENSION CORD W05-0477-00 (7P) W05-0609-00 (10P) SRC PWR OFF TI LOUD EJECT / PTY VOL ADJ MENU CLK NAME.S SCAN B.S/...

[Page 2] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 2 BLOCK DIAGRAM IC8 RDS DECODER IC1 KEY PANEL 5V MUTE B.U DET. B.U ACC P-CONT. MUTE PRE OUT POWER IC MOTOR DRIVER IC6 EQ. AMP CH. ISO AMP. N.C/MPX E-VOL. CD/MD CHANGER FRONT Lch FRONT Rch REAR Lch REAR Rch J2 LCD DRIVER LCD ME1 MAI...

[Page 3] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 3 COMPONENT DESCRIPTION SYNTHESIZER UNIT (X14-6xxx-xx) REF. No. FUNCTION OPERATION IC1 -COM Controls system. IC2 ELECTRIC VOLUME Switches each source, decodes FM stereo signal, controls sound. IC4 POWER IC Amplifies power so that t...

[Page 4] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 4 CIRCUIT DESCRIPTION (X14-) IC1 : -COM PORT No. PORT NAME I/O FUNCTION OPERATING CONDITION 1 AV CONT O Analogue reference voltage control. Active "H". 2 IC2 TYPE O I Stereo signal data switch. - 3 IC2 TYPE 1 I Stereo si...

[Page 5] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 5 CIRCUIT DESCRIPTION (X14-) IC1 : -COM PORT No. PORT NAME I/O FUNCTION OPERATING CONDITION 41 AFC O Noise detection time constant switch. "L" : FM seeking. "H" : The other condition. 42-44 N.C. - - - 45 P-MUTE...

[Page 6] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 6 TEST MODE 1. How to enter the test mode • Reset the unit while holding the “FM” key and preset “6” key. • All indication segments go ON at the beginning of the test mode. 2. How to check the test mode • Cancel the b...

[Page 7] Kenwood KRC-478R

7 KRC-478R/RV/RY/RYV ADJUSTMENT BALANCE/FADER/BASS/TREBLE : CENTER T.ADV/METAL/DOLBY NR/AUTO : OFF No. ITEM INPUT SETTINGS OUTPUT SETTINGS RECEIVER SETTINGS ALIGNMENT POINTS ALIGN FOR FIG. CASSETTE DECK SECTION 1 AZIMUTH TCC-153 10KHz (B) TAPE PLAY H...

[Page 8] Kenwood KRC-478R

V 8 KRC-478R/RV/RY/RYV PARTS DESCRIPTIONS ...

[Page 9] Kenwood KRC-478R

W1 W2 R274 TH1 C209 R268 C260 R265 R266 R282 R303 C311 C312 R304 C317 R309 R310 C308 C307 R316 R308 R307 R315 R314 R313 R302 R317 R144 R259 C202 R323 R322 C316 C218 R257 C321 R260 C217 R271 R277 R263 R264 C225 R209 R280 R201 C10 R258 R212 R267 R272 R...

[Page 10] Kenwood KRC-478R

KMOQSLNPRT 2 1 3 5 7 4 6 C324 B E E EB B R328 R327 C323 C3 R1 EB R2 R330 R329 R3 BE 1 5 R282 R284 R280 R281 R276 R277 R275 R18 W1 R145 R351 R356 R201 R142 R209 R124 R122 C102 R125 R102 C101 R144 C111 R286 R287 R116 3 4 R127 C217 C215 C218 R302 C10 BE...

[Page 11] Kenwood KRC-478R

A BDFHJCEGI 2 1 3 5 7 4 6 7.7V 5.0V 5.0V 0V 0V 7.6V 7.6V 0V 0V 5V 1V 5V 0V 0V 5V 0V 5V 0V 5V 0V 0V 7.3V 4.7V 14.4V 7.3V 0V 7.3V 7.2V 0V 7.3V 7.3V 7.3V 14.4V 0V 0V 5V 0V 5V 0V 5V 0V 0V 5V 0V 5V 5V 0V 5V 0V 5V 0V 5V 0V 0V 5V 5V 0V 5V 0V 5.0V 0V 5V 0V 0...

[Page 12] Kenwood KRC-478R

TKMOQSLNPR KRC-478R/RV/RY/RYV 5V 0V 5V2.3V2.3V 0V 5.0V 5.0V0V 4.0V 4.0V 4.7V 7.8V 0V 0V 3.8V 4.8V 3.8V 3.8V 0V 5V 0V 5V 5V 1V 7.9V 4.0V 4.0V 3.8V 3.8V 3.8V 5.7V 2.7V 0V 5V 0V 5V 4.0V 0V 0V +B LINE CAUTION: For continued safety, replace safety critica...

[Page 13] Kenwood KRC-478R

U VXZABADWYAAAC 2 1 3 5 7 4 6 B LINE 5V 0V 0V 5V 5.0V 3.0V 1.5V 0V 5V 0V 3.9V 0V CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list). indicates safety critical co...

[Page 14] Kenwood KRC-478R

KRC-478R/RV/RY/RYV Parts with exploded numbers larger than 700 are not supplied. a A B C D E F G H J L M N P Q R S M2x2.5 M1.7x7 M2x2.2 M2x3 M2x5 (BLK) M2.6x3(BLK) 1.2x 3 1.6x 3.2 1.6x 3.2 1.6x 3.2 2.1x 4 1.5x ...

[Page 15] Kenwood KRC-478R

V KRC-478R/RV/RY/RYV Parts with exploded numbers larger than 700 are not supplied. A B C D E A A E A A A A A A A A (X14-) UNIT (1/2) KRC-478R/RV/RY/RYV (E/E/E/E) 3x5 M3x8 3x8 M3x12 M2.6x8 (BLK) C B Dx2 Dx2 A 261 DC1 (KRC-478R/RY o...

[Page 16] Kenwood KRC-478R

Parts with exploded numbers larger than 700 are not supplied. G G UNIT (2/2) KRC-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-47...

[Page 17] Kenwood KRC-478R

✽ New Parts Parts without Part No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. AN Desti- AN Desti- Ref. No. d e Parts No. Description nation Ref. No. d e Parts No...

[Page 18] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 23 PARTS LIST ✽ New Parts Parts without Part No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. (X14-6xxx-xx) AN Desti- AN Desti- Ref. No. de Pa...

[Page 19] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 24 PARTS LIST ✽ New Parts Parts without Part No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. (X14-6xxx-xx) AN Desti- AN Desti- Ref. No. de Pa...

[Page 20] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 25 PARTS LIST ✽ New Parts Parts without Part No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. (X14-6xxx-xx) AN Desti- AN Desti- Ref. No. de Part...

[Page 21] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 26 PARTS LIST ✽ New Parts Parts without Part No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. AN Desti- AN Desti- Ref. No. de Parts No. Descri...

[Page 22] Kenwood KRC-478R

KRC-478R/RV/RY/RYV 27 ...

[Page 23] Kenwood KRC-478R

KRC-478R/RV/RY/RYV SPECIFICATIONS KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. KENWOOD CORPORATION 14-6, Dogenzaka 1-chome, Shibuya-ku, Tokyo, 150-8501 Japan KENWOOD...