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CASSETTE RECEIVER
KRC-478R/RV/RY/RYV
SERVICE MANUAL
KRC-478R/RV/RY/RYV (E)
KRC-478R
LOUD
ANTENNA ADAPTOR
(T90-0523-05)
DC CORD
(E30-4792-05)
(KRC-478R/RY only)
CD MD-CHANGER CONTROL
SCAN
B.S/RDM
REP
PLASTIC CABINET ASSY
(A02-1486-13)
© 1999-11 PRINTED IN KOREA
B51-7567-00 (K) 1894
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
EJECT
MENU
/ PTY
40W 4
X
D.SCN
M.RDM
TI
CLK
VOL ADJ
NAME.S
LEVER
(D10-xxxx-xx) x2
(Refer to the parts list.)
SRC
PWR
OFF
DISC
DISC
MOUNTING HARDWARE ASSY
(J21-9491-03)
40%
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Table of Contents
Related Manuals for Kenwood KRC-478R
Summary of Contents for Kenwood KRC-478R
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Page 1: Service Manual
CASSETTE RECEIVER KRC-478R/RV/RY/RYV SERVICE MANUAL © 1999-11 PRINTED IN KOREA B51-7567-00 (K) 1894 MECHANISM EXTENSION CORD W05-0477-00 (7P) W05-0609-00 (10P) KRC-478R/RV/RY/RYV (E) EJECT MENU / PTY KRC-478R DISC CD MD-CHANGER CONTROL 40W 4 SCAN B.S/RDM D.SCN M.RDM DISC LOUD VOL ADJ NAME.S... - Page 2 B.U.5V SW14W 340mV T-END B.U DET. Q6,7 SW5V PANEL 5V Ref.95 8V AVR Q14-17 P-CONT. SYBY (X13) PANEL SW (GND) RESET SW Q10-13 PACK ILLUMI. Ref.105 REMOTE D1-17 Q1,2 B.U.5V B.U.5V Q2,3 MODE Ref.102 GRN/RED LCD DRIVER DRIVER KRC-478R/RV/RY/RYV (E/E/E/E)
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Page 3: Component Description
KRC-478R/RV/RY/RYV COMPONENT DESCRIPTION SYNTHESIZER UNIT (X14-6xxx-xx) REF. FUNCTION OPERATION -COM Controls system. ELECTRIC VOLUME Switches each source, decodes FM stereo signal, controls sound. POWER IC Amplifies power so that the speaker can drive audio signal. EQUALIZER AMPLIFIER Amplifies and equalizes the cassette head output signal (120 sec). -
Page 4: Circuit Description
KRC-478R/RV/RY/RYV CIRCUIT DESCRIPTION (X14-) IC1 : -COM PORT PORT NAME FUNCTION OPERATING CONDITION AV CONT O Analogue reference voltage control. Active "H". IC2 TYPE O Stereo signal data switch. IC2 TYPE 1 Stereo signal data switch. AVSS Analogue GND. "H" : Mechanism motor +B "ON". - Page 5 KRC-478R/RV/RY/RYV CIRCUIT DESCRIPTION (X14-) IC1 : -COM PORT PORT NAME FUNCTION OPERATING CONDITION "L" : FM seeking. O Noise detection time constant switch. "H" : The other condition. N.C. 42-44 P-MUTE O Mute signal output to the power IC (IC4).
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Page 6: Test Mode
KRC-478R/RV/RY/RYV 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 •... - Page 7 KRC-478R/RV/RY/RYV ADJUSTMENT BALANCE/FADER/BASS/TREBLE : CENTER T.ADV/METAL/DOLBY NR/AUTO : OFF INPUT OUTPUT RECEIVER ALIGNMENT ITEM ALIGN FOR FIG. SETTINGS SETTINGS SETTINGS POINTS CASSETTE DECK SECTION Head azimuth Adjust so that output TCC-153 screw level in playing "FWD" AZIMUTH TAPE PLAY 10KHz (FWD/REV) and "REV"...
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Page 8: Parts Descriptions
KRC-478R/RV/RY/RYV PARTS DESCRIPTIONS... -
Page 9: Pc Board(Component Side View)
PC BOARD(Component side view) SWITCH UNIT SYNTHESIZER UNIT X13-942x-xx (J74-0818-02) X14-6xxx-xx (J74-0973-12) C253 C255 R255 R253 R256 R254 C254 C256 C260 R267 R268 R265 R266 R262 C257 R251 C258 C267 R264 R263 R258 C262 C263 C251 C261 C264 IC10 C201 C202 R270 R272... - Page 10 PC BOARD(Foil side view) SWITCH UNIT X13-942x-xx (J74-0818-02) SYNTHESIZER UNIT X14-6xxx-xx (J74-0973-12) C255 C253 R255 R253 R256 R254 C256 C254 C260 R268 R267 R266 R265 R251 R262 C257 C258 R264 R263 R258 C262 C261 C263 C251 C264 IC10 C201 C202 R270 R272 R212...
- Page 11 C12 0.01 TEL MUTE SW 14V R19 47K POWER AMPLIFIER (X14-6xxx-xx) R5 10K SVR CONTROLLER MODEL NAME UNIT No. R155 R156 KRC-478R (E) X14-6172-70 100u16 KRC-478RY (E) X14-6222-70 KRC-33R (E) X14-6172-71 KRC-378R (E) KRC-378RY (E) X14-6222-71 KRC-480R (M) 100u10 KRC-478RV (E)
- Page 12 330K T-END acceptably insulated from the supply circuit) before the SUB(+) appliance is returned to the customer. T-END SUB(-) STBY SUPPLY R324 750 PACK IN REEL STBY SUB(+) R321 22K Ref.95 SUB(-) MODE MODE Ref.100 Ref.107 KRC-478R/RV/RY/RYV (E/E/E/E) (1/2) KRC-478R/RV/RY/RYV...
- Page 13 To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer. KRC-478R/RV/RY/RYV (E/E/E/E) (2/2) KRC-478R/RV/RY/RYV...
- Page 14 KRC-478R/RV/RY/RYV EXPLODED VIEW (MECHANISM) : N09-4193-08 M2x2.5 : N09-4194-08 M1.7x7 : N09-4195-08 : N09-4196-08 M2x2.2 : N09-4197-08 : N09-4198-08 M2x3 : N09-4199-08 M2x5 (BLK) : N09-4200-08 M2.6x3(BLK) : N09-4201-08 1.2x : N19-2087-08 1.6x : N19-2088-08 1.6x : N19-2089-08 1.6x : N19-2146-08 2.1x...
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Page 15: Exploded View (Unit)
KRC-478R/RV/RY/RYV EXPLODED VIEW (UNIT) (KRC-478R/RY only) (X14-) (X14-) N83-3005-46 M3x8 N30-3008-46 (X14-) N80-3008-46 M3x12 N30-3012-46 M2.6x8 (BLK) N30-2608-45 (X14-) (X14-) (X14-) (X14-) (X14-) (X14-) Refer to the following page. UNIT (1/2) KRC-478R/RV/RY/RYV (E/E/E/E) Parts with exploded numbers larger than 700 are not supplied. - Page 16 KRC-478R/RV/RY/RYV EXPLODED VIEW (UNIT) 2x8 (BLK) See parts list. N80-2006-46 (X13-) (X13-) (KRC-478RV/RYV only) (X13-) (X13-) (X13-) (X13-) (X13-) (X13-) (X13-) UNIT (2/2) KRC-478R/RV/RY/RYV (E/E/E/E) Parts with exploded numbers larger than 700 are not supplied.
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Page 17: Parts List
H25-0337-04 PROTECTION BAG (180X300X0.03) H25-1111-04 PROTECTION BAG (280X450X0.03) EE1 RK73EB2B361J CHIP R 1/8W RK73EB2B271J CHIP R 1/8W H54-1581-03 ITEM CARTON CASE (KRC-478R) E R19 ,20 RK73FB2A273J CHIP R 1/10W H54-1582-03 ITEM CARTON CASE (KRC-478RV) E1 RK73FB2A4R7J CHIP R 1/10W H54-1585-03... - Page 18 CHIP R 100K 1/10W C315-317 CK73FB1H103K CHIP C 0.010UF R103 RK73FB2A471J CHIP R 1/10W E : KRC-478R E3 : KRC-478RY E : Europe K : North America M : Other Areas E1 : KRC-478RV indicates safety critical components. E2 : KRC-478RYV...
- Page 19 CHIP R 1/8W TDA7384A ANALOGUE IC R277 RK73EB2B4R7J CHIP R 1/8W HA12221F ANALOGUE IC E : KRC-478R E3 : KRC-478RY E : Europe K : North America M : Other Areas E1 : KRC-478RV indicates safety critical components. E2 : KRC-478RYV...
- Page 20 E3E2 J31-1036-08 COLLAR Q63 ,64 2SB1277(Q,R) TRANSISTOR D14-0683-08 ROLLER 2SA1037K TRANSISTOR D14-0684-08 ROLLER E : KRC-478R E3 : KRC-478RY E : Europe K : North America M : Other Areas E1 : KRC-478RV indicates safety critical components. E2 : KRC-478RYV...
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Page 21: Retaining Ring
RETAINING RING T31-0220-08 PLAYBACK HEAD T42-0759-18 MOTOR ASSY (MAIN) T42-1005-08 MOTOR ASSY (SUB) E : KRC-478R E3 : KRC-478RY E : Europe K : North America M : Other Areas E1 : KRC-478RV indicates safety critical components. E2 : KRC-478RYV... - Page 22 KRC-478R/RV/RY/RYV...
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Page 23: Specifications
53mm (Depth) 158mm Weight 1400g 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 SERVICE CORPORATION KENWOOD ELECTRONICS ITALIA S.p.A. P.O. Box 22745, 2201 East Dominguez Street, Via G.