Kenwood KRC-2902YA Service Manual Download

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CASSETTE RECEIVER

KRC-2902YA/G

SERVICE MANUAL

45Wx4

HIGH POWER

KRC-2902

LOUD

PWR

OFF

AME

AUTO

CLK

SRC

AUD

T. CALL

WIDE BAND

REW

P R

O G

Lever
(D10-3031-04)x2

Plastic cabinet assy
(A02-1486-13)

Mounting hardware assy
(J21-9491-13)

DC cord
(E30-4790-05)

Antenna adaptor
(T90-0523-05)

Escutcheon
(B07-2124-02)

Knob (ATT)
(K25-1388-03)

Cassette lid
(A53-1638-13)

Panel assy
(A64-2520-02)

Summary of Contents for KRC-2902YA

Page 1: ... KRC 2902 LOUD PWR OFF AME AUTO CLK SRC AUD T CALL MENU WIDE BAND REW PR FF OG Lever D10 3031 04 x2 Plastic cabinet assy A02 1486 13 Mounting hardware assy J21 9491 13 DC cord E30 4790 05 Antenna adaptor T90 0523 05 Escutcheon B07 2124 02 Knob ATT K25 1388 03 Cassette lid A53 1638 13 Panel assy A64 2520 02 ...

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 SW5V ACC DET B U DET SCL MUTE SDA P CON PANEL HOLD L CLK L DATA S L DATA L FWD REV MOTOR Rch COM Lch MP IN AM MPX OUT RR OUT LR OUT RF LEVEL SCL SDA OUT LF STBY MUTE Rch Lch T MUTE FWD REV B U 5V B U 8V B U S MUTE 4 6 5 B U 5V AM B VDD 5V PACK IN L RES ANT CON BEEP SVR AMP STBY SVR AC GND ...

Page 3: ...during the power on Q60 61 ILLUMI B DRIVER Works during the power on Q150 E VOL MUTE SW Works when the back up current is detected or the changer mute works or system µ com mute works Q151 SVR FORCED DISCHARGE SW Works when the amplifier mute works Q201 FM B SW Works during FM mode Q203 AM B SW Works during AM mode Q260 MOTOR B SW Works during the tape mode Q261 MOTOR B DRIVER Works when Q206 work...

Page 4: ... DATA H O Changer communication data 18 CH CLK I Changer communication clock 19 26 27 MOTOR O Cassette tape motor SW 28 FF REW I Cassette tape FF REW detection L FF or REW works 29 31 32 SD I Signal detection H Signal exists L Signal does not exist 33 VSS 1 GND 34 35 PLL CLK O Front end communication clock 36 PLL DATA I O Front end communication data 37 AM A O AM power supply SW 38 FM B O FM power...

Page 5: ...CLK I RDS clock 63 REQ C I Changer request 64 PACK IN I Cassette tape pack in detection 65 KEY REQ I Key signal input detection 66 SEL 0 I Destination SW 67 VSS 0 GND 68 VDD 1 5V power supply 69 X2 Main system clock 70 X1 I Main system clock 71 IC GND 72 73 XT1 5V power supply 74 VDD 0 5V power supply 75 AVREF 0 I A D converter reference voltage 76 S METER I S meter detection H S meter exists L S ...

Page 6: ...dness 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 DOWN keys Sound coordination doesn t appear for the feed TEST MODE ADJUSTMENT Head Angle Adjustment Head height alignment procedure During FWD transport adjust screws F and F so that line A of 2 LINE TAPE passes trough the center of the head shield plate co...

Page 7: ... R251 R151 C214 R503 C600 C601 W171 R125 R123 C13 C14 R58 R52 R54 R106 R112 C164 R352 C154 C153 C351 TH1 R504 R155 R154 R153 R322 R401 R400 R380 R408 R409 R407 R406 R412 R410 R411 R303 R302 R304 R306 R305 R403 R301 R402 C504 C54 C502 C505 R63 R64 W162 C501 R1 C1 R201 R203 R150 W153 C452 C202 C204 R455 R453 R454 R451 R450 R452 R205 R141 R2 C2 C5 R382 C6 C157 R111 R113 R404 R103 R108 C151 C156 C155 ...

Page 8: ...R154 C161 19 SCL 1u50 C152 L6 4 7uH 4 7uH L7 L10 0 01 C214 58 60 RL BU YEL 9 TEL MUTE BRN 12 11 10 VIOL BLK GRN BLK RR RR RL VIOL 15 13 14 RL GRN 16 1 3 5 7 RR RL FL FL FR RR FR 2 2 6 8 5 7 4 1 3 6 8 GND 4 ACC P CON B A BLK 1 ANT CON P CON BLU WHT BLU WHT RED 4 2 3 GRY BLK WHT BLK GRY 7 6 5 FR FR FL WHT 8 FL R261 R262 47K GND 1 PACK IN 2 1 2W 1K R260 10K 47K R263 GND 5 MOT 3 MOT 4 T MUTE 6 28 27 B...

Page 9: ... COM3 COM2 COM1 S55 S53 S54 S51 S52 S49 S50 S48 S46 S47 S45 S44 S43 S42 S41 S40 S39 S38 S37 S36 S35 S34 S33 S32 S31 S30 S29 S28 S27 S26 S25 54 53 52 51 S23 S22 S21 S20 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 47 46 48 50 49 52 51 54 53 55 C1 C2 C3 4 12 10 11 5 9 6 8 7 13 14 15 16 17 18 19 20 21 22 23 R17 3 3 0V 5V 5 0V 3 3V 1 7V 0V 5 0V 5V 3 3V 0V 5V 0V 5V 1 7V 3 3V 5V 0V 0V ...

Page 10: ...he exploded numbers larger than 700 are not supplied A B 1 2 3 31 54 4 99 101 115 53 111 102 102 12 103 111 31 33 14 102 114 52 39 10 40 34 58 57 39 9 35 112 113 7 6 26 25 HD1 56 100 106x2 37 36 38 M1 20 5 1 23 22 105x2 113 112 16 18 17 19 102 104 13 ...

Page 11: ...3x8 φ3x20 φ2 6x6 M3x8 N30 3004 46 N83 3005 46 N35 3010 46 N80 3008 46 N83 3020 46 N86 2606 46 N30 3008 46 A B C D E F K B B B B X14 Ax2 Ax2 737 K K Refer to the following page ME1 A1 F1 244 211 242 206 201 221 766 216x2 X14 J1 X14 X14 J5 X14 J4 X14 772 X14 771 X14 770 X14 773 X14 J2 X14 L1 724 702 B B E D Cx2 Fx2 263 DC1 14 ...

Page 12: ...0 are not supplied E F 1 2 3 G J H G φ2x6 φ1 5 φ2x8 BLK N80 2006 46 N29 0205 04 N80 2008 45 G H J Jx2 Jx2 203 228 218 219 229 217 704 767 X16 X16 X16 277 X16 278 X16 279 X16 ED1 X16 276 780 207 230 241 253 709 249 222 205 PA1 250 246 252 251 254 248 251 255 227 227 227 247 226 15 ...

Page 13: ...TAPTITE SCREW K 1D N30 3008 46 PAN HEAD MACHINE SCREW Ref No A d d N e w Parts No Description Dest inati on 263 1C T90 0523 05 ANTENNA ADAPTOR C1 2 CK73GB1H152K CHIP C 1500PF K C3 4 CE04CW0J470M ELECTRO 47UF 6 3WV C5 6 CC73GCH1H101J CHIP C 100PF J C7 8 CK73GB1E223K CHIP C 0 022UF K C7 8 CK73GB1H223K CHIP C 0 022UF K C9 10 CE04CW1A101M ELECTRO 100UF 10WV C13 14 CK73GB1A224K CHIP C 0 22UF K C15 18 C...

Page 14: ...B2A102J CHIP R 1 0K J 1 10W R133 RK73GB2A473J CHIP R 47K J 1 10W R140 RK73GB2A473J CHIP R 47K J 1 10W R142 RK73GB2A473J CHIP R 47K J 1 10W R150 151 RK73GB2A472J CHIP R 4 7K J 1 10W R152 RK73FB2B102J CHIP R 1 0K J 1 8W R153 RK73GB2A913J CHIP R 91K J 1 10W R154 RK73GB2A751J CHIP R 750 J 1 10W R155 RK73GB2A431J CHIP R 430 J 1 10W R156 RK73GB2A184J CHIP R 180K J 1 10W Ref No A d d N e w Parts No Descr...

Page 15: ... Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Teile ohne Parts No werden nicht geliefert Ref No A d d N e w Parts No Description Dest inati on IC2 TDA7400D ANALOGUE IC IC3 HD74HC27FP MOS IC IC4 TDA7386 ANALOGUE IC IC5 LA3161 IC PREAMP X2 IC6 PST9135NR ANALOGUE IC Q49 50 2SC2412K TRANSISTOR Q49 50 2SD601A TRANSISTOR Q51 2SB1443 TRANSISTOR Q52 2SC2412K T...

Page 16: ...LLER 38 1A D10 4101 08 LEVER 39 2A G01 2830 08 COMPRESSION COIL SPRING 40 2A D10 4102 08 ARM 52 2A D13 1110 08 GEAR 53 2B D15 0909 08 PULLEY 54 3B D16 0606 08 BELT 56 1B D10 4105 08 ARM ASSY 57 2B D10 4104 08 ARM 58 2B G01 2831 08 TENSION COIL SPRING 99 3B E39 0181 08 WIRE HARNESS 100 1B J11 0618 08 CLAMPER 101 3B N09 4328 08 SCREW 102 3A N09 4326 08 SCREW 103 3A N09 4191 08 SCREW 104 1B N09 4192 ...

Page 17: ...5dB MONO Selectivity DIN dB 80dB 400kHz Stereo Separation 87 5MHz 108 0MHz 35dB 1kHz MW Section Frequency Range 531kHz 1611kHz Frequency step 9kHz Usable Sensitivity S N 20dB 25µV LW Section Frequency Range 153kHz 281kHz Usable Sensitivity S N 20dB 45µV Cassette Section Tape Speed 4 76cm sec Wow Flutter 0 12 WRMS Frequency Response 3 0dB 30Hz 14kHz 120µs Separation 40dB 1kHz S N dB 52dB Pre out Se...

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