Kenwood KRC-28MR Service Manual Download

Page: 7 / 19

Refer to the schematic diagram for the value of resistors and capacitors.

PC BOARD (Component side view)

W122

R58

R155

R15

W112

R14

R62

W113

R152

R129

R59

W133

W119

R413

C202

R16

R13

W121

R372

R151

C101

R324

C163

R161

W135

R102

R119

R115

R126

R60

R61

R52

R54

R105

R106

R103

R207

R206

C164

R352

R320

C155

C154

C157

C156

C153

C151

C351

C506

R127

R154

R150

R153

R322

R401

R400

R408

R409

R407

R406

R412

R410

R41

R303

R304

R306

R305

R403

R301

R402

R321

W129

C54

R63

R64

R57

C52

W116

R201

R203

R200

C200

C452

C201

R205

R455

R453

R454

R451

R450

R452

R104

C14

C13

C251

R251

R323

W131

W125

C102

C103

W128

W130

R160

W124

W118

R158

W117

W115

W123

R157

R156

R159

R250

R405

R404

R137

W134

W120

R122

R125

R120

R121

R123

111

R109

W126

W127

R108

W132

R131

C321

TH1

E B

B E

E B

B E

E B

B E

E B

B E

E B

B E

E B

B E

E B

B E

Q61

Q52

Q371

Q59

Q58

Q57

Q153

Q151

Q150

Q55

Q54

Q53

Q50

Q353

Q301

Q320

Q352

Q351

Q202

Q200

Q451

Q450

Q260

IC3

IC2

IC1

X14-614x-xx (J74-0959-22)

SYNTHESIZER UNIT

CN1

Q60

Q56

D411

D405

D352

Q51

Q350

D401

D400

D56

D52

D51

D55

D54

D402

D408

D409

D403

D350

D351/W104

D53

Q201

Q203

D200

Q261

D404

D260

IC5

D370

IC4

D50

Q370

D371

D151

D150

D152

WH1

D100

CN2

D261

REMO

GND

W100

W28

W75

W85

W22

W33

W73

W67

W72

W65

W13

W96

W35

W36

W68

W64

W15

W31

W71

W69

W27

W79

W76

W34

W39

W43

W46

W51

W98

W99

W23

R50

R65

R351

R353

R66

W48

W10

C50

C17

C18

C160

C152

C55

W40

W20

C15

C16

C161

C350

C352

C162

C450

C451

C150

C159

C56

C58

C53

C57

W58

W94

W95

W101

W54

W41

W53

W29

W12

W16

W18

R261

R260

C402

C400

C401

W14

W17

W11

C250

C10

W92

W70

W59

W30

W25

W50

W24

W87

W80

W97

W93

W89

W88

W103

W86

W90

W78

W61

W56

W82

W44

W47

W83

W19

W74

W81

W49

W77

W37

W63

W32

W55

W102

W57

W52

W60

W62

W38

W84

W42

W21

W45

4.5M

R202

R55

R67

R350

R370

W105

R371

C206

R373

W26

C320

R138

R132

10 6

11 12 8 4 3 2

R20

R21

R14

R18

R13

R12

R19

D17

IC1

SWITCH UNIT

D10

D11

ED1

D14

X13-965x-xx (J74-0963-12)

D12

D13

D15

PL1

PL2

SRC

AUT

CLK

RESET

AUD

Summary of Contents for KRC-28MR

Page 1: ...R SCREW SET N99 1632 05 KRC 218 CD MD CHANGER CONTROL KRC 288 KRC 288 M AUD 1 2 3 4 5 6 CLK ATT SRC PWR OFF AME ADJ AUTO SCAN RDM REP T C D SCN M RDM LOUD DISC CRSC A ADJ FM AM FF REW PR OG AUD 1 2 3 4 5 6 CLK ATT SRC PWR OFF AME ADJ AUTO SCAN RDM REP T C D SCN M RDM LOUD DISC CRSC A ADJ FM AM FF REW PR OG AUD 1 2 3 4 5 6 CLK ATT SRC PWR OFF AME ADJ AUTO T CALL LOUD CRSC A ADJ FM AM FF REW PR OG A...

Page 2: ...ONT FM ANT AM ANT RF 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 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 T MUTE FWD REV B U 5V 8V B U CHRST S MUTE 8...

Page 3: ...n Q58 and Q59 work Q150 ELECTRIC VOLUME MUTE SW Works when the base level comes H Q151 SVR DISCHARGE SW Works when the base level comes H Q153 PRE MUTE DRIVER Works when the base level comes L Q200 FM B SW Works when the base level comes H in FM mode Q201 FM B DRIVER Works when Q200 works Q202 AM B SW Works when the base level comes H in AM mode Q203 AM B DRIVER Works when Q203 works Q260 MOTOR B ...

Page 4: ... C I Request from changer 33 MUTE O Mute 34 CH CON O Changer control 35 REQ H O Request to head unit 36 SVR O Power IC IC4 discharge control 37 AMP STBY O Power IC IC4 stand by 38 AMP MUTE O Power IC IC4 mute 39 P CON O P CON for external amplifier 40 ANT CON O Power antenna 41 SW5 O Circumambient circuit power supply control 42 ILL O Illumination 43 No connection 44 BEEP O Buzzer 2KHz 45 47 No co...

Page 5: ...est mode Simply reset the unit NOTE The test mode is not canceled by ACC OFF power OFF momentary power down or the panel off 3 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 DOWN keys Sound coordination doesn t appear f...

Page 6: ...kehren und die Ausrichtung in Vorwärtsrichtung noch einmal überprüfen Wenn eine Abweichung festgestellt wird ist diese Einstellung zu wiederholen Verwendetes Band SCC 1659 hergestellt von A BEX 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 core center area During RVS t...

Page 7: ...3 IC2 IC1 X14 614x xx J74 0959 22 SYNTHESIZER UNIT CN1 Q60 Q56 D411 D405 D352 Q51 Q350 D401 D400 D56 D52 D51 D55 D54 D402 D408 D409 D403 D350 D351 W104 D53 Q201 Q203 D200 Q261 D404 D260 IC5 J4 J5 J2 J1 A1 D370 IC4 D50 Q370 D371 D151 D150 D152 P1 WH1 D100 J3 CN2 D261 REMO GND W100 W28 W75 W85 W22 W33 W73 W67 W72 W65 W13 W96 W35 W36 W68 W64 W15 W8 W31 W71 W69 W27 W79 W76 W34 W39 W43 W46 W51 W98 W99 ...

Page 8: ...R59 B E R154 E B R155 W119 R152 R151 R153 R372 W113 W112 TH1 C52 R57 E B C7 R5 C5 R1 C1 C6 C8 R2 C2 R251 C251 R60 E R61 B B E E B E B W122 R62 R64 R63 E B IC3 Q260 Q202 IC2 Q150 Q200 Q450 Q153 Q451 Q301 Q320 Q351 IC1 Q371 Q352 Q353 Q50 Q52 Q151 Q54 Q55 Q59 Q58 Q53 Q57 Q61 D260 WH1 Q261 P1 D261 X14 614x xx SYNTHESIZER UNIT J74 0959 22 CN2 D200 A1 Q203 Q201 J1 J5 D403 D401 D402 D409 D411 D405 D404 D...

Page 9: ...BY SVR REQ H CH CON MUTE REQ C VDD GND GND FF REW PACK IN FM B AM B SCL MOTOR CH CLK DATA H DATA C SD PLL CLK PLL DATA SDA L CE L CLK L DATA S L DATA L GND XIN GND GND HOLD VDD GND GND VDD GND GND VSS GND XOUT SW5V ILL BEEP ROLL OFF NOISE CANCELLER SEL1 SEL2 EQ MUTE FWD REV REMO ACC DET B U DET S METER PANEL R110 47K R108 47K 2 1 R104 100K 38 37 36 27 28 26 25 27 R154 750 C161 1u50 41 61 62 41 44 ...

Page 10: ...10 R4 100 GND VCC R OUT 5 4 100P C6 R NF 3 2 C4 47u6 3 R IN 1 16 7 25 26 0 12 0 21 NO YES NO NO YES YES MODEL NAME KRC 208S K UNIT NO 0 10 NO YES NO R122 R120 KRC 288 M KRC 218 K KRC 268 M KRC 28MR K YES YES YES R121 YES NO R123 YES 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AC OUT L AC OUT R CREF OUT LF OUT RF OUT LR OUT RR VDD GND SDA SCL S MUTE MUX R MUX L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AC IN ...

Page 11: ... VDD VDD2 VDD1 VSS OSC DATA L CE CLK DATA S KI1 KI2 KI4 KI3 C4 0 047 C5 820P C1 0 047 R19 68K C2 0 01 R8 4 7 R18 1K 63 64 62 61 62 61 63 R11 100 R13 100 R14 100 R12 100 64 25 12 13 14 15 16 26 27 28 29 30 31 32 18 19 20 21 22 23 24 17 CO3 CO2 CO1 37 36 35 34 33 PL1 PL2 13 13 R21 470 R6 470 R5 330 R4 R3 330 R1 470 R2 330 KS1 KS2 KS3 KS4 KS5 KI4 KI3 KI2 KI1 KRC 28MR K PL1 2 KRC 208S K B30 1483 05 0 ...

Page 12: ...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 D40 1136 05 MECHA KRC 208S 218 268 288 28MR K K M M K 1 2 3 A B KRC 208S 218 268 288 28MR EXPLODED VIEW MECHANISM 15 ...

Page 13: ... C D E F B Fx2 B B B B B X14 Cx2 Ax2 Ax2 E D Except KRC 28MR 737 A A Refer to the following page ME1 A 1 F1 244 216 DC1 242 207 201 262 726 767 261 243 221x2 X14 J 1 X14 X14 J 5 X14 J 4 KRC 208S KRC 288 KRC 28MR only X14 778 X14 777 X14 776 X14 J 2 X14 L 1 729 703 UNIT 1 2 KRC 208S 218 268 288 28MR K K M M K 1 2 3 C D 16 KRC 208S 218 268 288 28MR EXPLODED VIEW UNIT ...

Page 14: ...0205 04 N80 2008 45 G H J Jx2 Jx2 710 204 233 223 224 234 222 705 766 X13 X13 X13 272 X13 273 X13 274 X13 ED1 X13 271 775 208 206 235 256 259 PA1 241 227 252 253 251 257 258 255 232 232 232 254 231 UNIT 2 2 KRC 208S 218 268 288 28MR K K M M K 1 2 3 E F 17 EXPLODED VIEW TDF KRC 208S 218 268 288 28MR ...

Page 15: ...UF K C5 CK73FB1H821K CHIP C 820PF K 227 3F E29 1599 02 CONDUCTIVE RUBBER DC1 1C E30 4783 05 DC CORD KK1K2 274 2E E29 1600 04 CONDUCTIVE RUBBER DC1 1C E30 4784 05 DC CORD M1M2 J1 E59 0831 05 RECTANGULAR PLUG F1 2D F52 0006 05 FUSE MINI BLADE TYPE 10A R1 RK73EB2B331J CHIP R 330 J 1 8W F1 2D F52 0011 05 FUSE MINI BLADE TYPE 10A R2 RK73EB2B471J CHIP R 470 J 1 8W R3 4 RK73EB2B331J CHIP R 330 J 1 8W 231...

Page 16: ...R110 RK73FB2A473J CHIP R 47K J 1 10W C352 C90 2602 05 ELECTRO 0 10UF 50WV R114 RK73EB2B223J CHIP R 22K J 1 8W C400 CE04CW0J220M ELECTRO 22UF 6 3WV KK1M1 R115 RK73FB2A102J CHIP R 1 0K J 1 10W C401 402 C90 2606 05 ELECTRO 0 47UF 50WV KK1M1 R116 RD14BB2C472J RD 4 7K J 1 6W C450 451 C90 2597 05 ELECTRO 10UF 16WV R118 119 RK73FB2A222J CHIP R 2 2K J 1 10W C452 CK73FB1H103K CHIP C 0 010UF K R120 RK73FB2A...

Page 17: ...AMP X2 R401 402 RK73EB2B100J CHIP R 10 J 1 8W KK1M1 Q50 2SC2412K TRANSISTOR R403 RK73EB2B101J CHIP R 100 J 1 8W KK1M1 Q50 2SD601A TRANSISTOR R404 RK73FB2A104J CHIP R 100K J 1 10W KK1M1 Q51 2SB1443 TRANSISTOR R405 RK73EB2B104J CHIP R 100K J 1 8W KK1M1 Q52 2SC2412K TRANSISTOR R406 407 RK73EB2B472J CHIP R 4 7K J 1 8W KK1M1 Q52 2SD601A TRANSISTOR R408 RK73EB2B102J CHIP R 1 0K J 1 8W KK1M1 Q53 2SA1036K...

Page 18: ...1277 Q R TRANSISTOR M1M2 115 2B N19 2038 08 FLAT WASHER Q371 DTC114YK DIGITAL TRANSISTOR M1M2 Q371 UN2214 DIGITAL TRANSISTOR M1M2 HD1 1B T31 0229 08 PLAYBACK HEAD Q450 451 DTC143TK DIGITAL TRANSISTOR Q450 451 UN2216 DIGITAL TRANSISTOR M1 1A T42 1025 08 MOTOR ASSY TH1 PTH9C42BD471Q POSITIVE RESISTOR A1 2D X86 3160 11 FRONT END UNIT 1 2A A10 4328 08 CHASISS CALKING ASSY 4 3B J26 4017 08 PRINTED WIRI...

Page 19: ...1318 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 349544 KENWOOD ELECTRONICS MALAYSIA SDN BHD 4 01 Level 4 Wisma Academy Lot 4A Jalan 19 1 46300 Petaling Jaya Selangor Darul Ehsan Malaysia KRC 208S K KRC 218S K KRC 268 M KRC 28MR K KRC ...

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