Kenwood KRC-791/Y Service Manual Download Page 16

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WH1

ANT

D82

CN3

CN1

Q89

Q87

Q86

Q88

Q85

Q90

CN2

Q45

IC1

IC2

: TDA7407D

IC3

: M5237ML

IC4

: TA8263BH

IC10

: TC74HCO2AF

IC11

: TDA7479D

IC13

: BA6238A

IC15

: S-80837ANNP

: RD6.8MW

D3,22

: MA3062-M

D5,6,50,51

: DAP202K or

D11,13-18,38-40,44

: AM01Z

D21

: MA3062WA

D31

: RM1OZLF

D32

: RB160L-40

D33,36

: MA4056(N)-M

D37

: MA4062(N)-M

D41

: 1SS133

D42

: MA4220-H

D43

: MA4056-M

D45

: MA4075-M

D46

: MA4036-H

D52,82

: DAN202K or

D81

: MA3047-M

Q18,72,86,87

: DTC124EK or

Q20,22

: 2SB1548(P)
: 2SC2412K or

Q31,41,43

: DTC114YK or

Q32,46

: DTC144EK or

Q39

: DTA123JK or

Q85

: DTC144EUA or

SIGNAL LINE

Q46

MA4110-L

D53

DTC143TK or

Q1-4

Q21,24,34,37,73,90

2SA1037K or

Q23,29

2SB1277(Q,R)

Q28

2SB1184

Q33

Q36,44

UMC2N

Q38,42

2SB1443

2SA1576A or

Q45

2SB1188(Q,R)

Q88,89

2/2

X16-

(X16-118X-XX)

RST

SYSTEM u-COM

D81

AM +B
SW

FM +B
SW

IFC OUT
BUFFER

UPD703033GC138

IMSA-6801

M1F60

D12

COMPOSITE
OUT BUFFER

RDS
DECODER

PANEL
5V SW

B LINE

MA152WA

MA152WK

UN2216

KRC103S

2SD601A

2SB709A

KRC107S

KRC104S

KRA105S

2SB1218A

UN5213

(X14-6442-7X)

KRA103S

DTA124EK or

Q19,30,71

SUB

22K

47K

5V
0V

5.0V

2.5V

5.0V

2.5V

5.0V

5V
0V

0V or 3.25V

5.0V

5V
0V

5.0V

0V or 5.0V

5V
0V

5.0V

0.6V

0V-4.8V

0V-4.0V

5V
0V

5.0V

5V
0V

4.4V
0V

5V
0V

0V or 5.0V

0.6V or 1.6V or 4.0V

0V or 5.0V

0 or 5.0V

IC11

IC1

IC15

(X16-118X-XX)

MASK MECHA

10u6.3

EXTRES

GND

10u6.3

C224

330P

C222

10P

RDDA

RDCK

QUAL

OSC0

VREF

T57

OSC1

MPX

VCC

OSEL

C223 10P

C221

C225 0.01

TSEL

FILOUT

ARI

100

SW 5V

DIMMER

CC DET

MUTE

ANT CONT

P CON

TEST

DIMMER CONT/D

A-SD

PRE MUTE

P MUTE

IC2 SCK

IC2 SD

P STBY

P ON

BEEP

E VSS

E VDD

PLL CLK

PLL D

AFC

FM+B

AM +B

MC CLK/L CLK

MC DATA/L DATAS

SC DATA/L DATAL

CH CLK

CH DATA H

CH DATA C

BU DET

MTL

EQ MUTE

SC REQ/KEY REQ

CH REQ C

R CLK

DOLBY

PACK DET

MUSIC

IFC OUT

R QUAL

R DATA

S METER

NOISE

SRM DET

F REEL

ILL ON

AN 5V

VDD

VSS

TYPE 1

TYPE 0

ST TYPE

SRM SW1

NC/D

A-CLK

MC REQ/L CE

SRM SW3

SRM SW2

FWD/REV

MSC

CONT

A VDD

A VSS

VREF

PHONE

R REEL

CH MUTE

CH CON

CH REQH

CH RST

EXT AMP CONT

RESET

XT1

XT2

REGC

VSS

VDD

CLK OUT

MOTOR

MODE 3

MODE 1

MODE 2

SUB MOTOR 1

SUB MOTOR 2

SUB MOTOR 3

CAS/SRM

CP9 4.7K

CP8 2.2K

R364

L10

100K

CP7 2.2K

R340 2.2K

R339 10K

R338 1K

2.2K

C304

CP4 1K

47K

R365

R366

47K

R359

R328 100K

R326 100K

100K

R323 100K

100K

R324

CP3 1K

CP2 4.7K

X1 20MHz

0.01

C251

27P

C302

C301

C303 1

R303 470

47K

R352

R302 470

R305 4.7K

R304 4.7K

0.01

C307

R310 10K

R311 10K

R313 10K

R308 1K

R309 1K

R301 1K

GND

OUT

10K

R289

A GND

OUT L

+B 8V

OUT R

MTL

DOLBY B/C

DOLBY

MUTE

MS OUT

F/R

MS MODE

CK IN

D GND

ON/OFF

R198

47K

100K

R199

10u16

C190

R193

100K

470

R194

0.01

C191

R376 470

R374 470

R373 470

R372 1K

R371 1K

R370 470

ILL GND

ILL +B

L CLK

L-CE

RESET

L-DATAS

L-DATAL

DIMMER

PAN RESET

REMO

D GND

VDD

RDS OUT

AM IF OUT

S METER

AUDIO OUT

VDD 5V

NOISE OUT

DIG GND

SDA

SCL

IFC OUT

PLL + B

OSC GND

FM ANT

OSC GND

W/N

OSC GND

AM + B

FM + B

AM ANT

RF GND

IF1 GND

IF1 + B

R166

22K

R168

4.7uH

R165

22K

R167

4.7uH

L6 4.7uH

47K

R172

4.7K

R220

2.2K

R196

2.2K

R195

2.2K

R192

100K

R191

4.7K

R218

47K

R217

C252

47u6.3

4.7uH

4.7K

R315

22K

R348

10K

R357

C306

0.01

C173

R286

47K

22K

REMO

CP1 100K

R367

2.2K

R306

2.2M

R307

470

R344

R347

W102

R361 1K

R345

W104

R332

R331

C305 0.01

100u10

C154

4.7uH

W106

R221

C172

0.01

R83

100K

22P

R375 1K

R377

S.GND

RESET

PAN RESET

VDD

D GND

N.C.

REMO

DIMMER

L-DATAL

L-DATAS

L-CE

L CLK

ILL GND

ILL +B

KRC-791

KRC-V791

KRC-791Y

2-71

0-10

NAME

MODEL

No.

UNIT

220

R287

C256

W107

Q90

CONT

0.01

1000P

R333

R335

C226

+8V

+5V

R288

R321

376

MODEL NAME

KRC-791 (E)
KRC-791Y (E2)

UNIT

No.

2-72
2-73

R324

YES
YES

2-74

KRC-V791 (E2)

YES

470

R367

R323,

RST

R219

75
76

RST

52mH

GND

SRM DET

SUB -

SW 2

SUB +

SW 3

SW 1

ILL +B

+5V

VDD

N.C.

D GND

REMO

PAN RESET

L-DATAL

DIMMER

L-DATAS

ILL GND

L-CE

L CLK

RESET

ILL +B

+8V

KRC-791/Y

DTA123JK

DTA124EK

DTC114YK

DTC124EK

DTC143TK

DTC143ZK

DTC144EK

2SA1576A

2SC2412K

2SB1188

2SB1184

C E

2SB1548

2SB1277

2SB1443

2SA1037K

2SC4081

DTA114EUA

DTC144EUA

GND

OUT

UMC2N

BA6238A

DAN202K

DAP202K

TDA7479D

M5237ML

Summary of Contents for KRC-791/Y

Page 1: ...1404 03 Panel assy A64 2577 02 Knob UP DW K25 1408 03 DC cord E30 4942 05 Remote controller assy A70 0886 15 Antenna adaptor T90 0523 05 Screw set N99 1704 05 Torsion coil spring G01 2924 04 Lever D10 4562 04 x2 Mounting hardware assy J21 9716 03 Remote controller assy A70 2025 05 Plastic cabinet assy A02 1497 13 MASK key Knob PROG K25 1407 03 Front glass B10 4222 03 The CASSETTE MECHANISM OPERATI...

Page 2: ...T B SUB MODE 1 MS MODE F R MUTE MTL ON OFF BOLBY B C DOLBY ON OFF MS OUT R REEL F REEL MODE 3 TAPE IN SRM SW2 SRM SW1 RCLK QUAL RDATA NOISE S METER IFC IFC OUT PLL DATA PLL CLK MS OUT MTL ON OFF MODE 2 MODE 3 R REEL MODE 1 F REEL MS MODE F R MUTE DOLBY ON OFF DATA C CH RST CH MUTE DOLBY B C DATA H CH CON CH CLK REQ H REQ C TAPE IN SRM DET RESET SUB MOT2 SUB MOT1 SUB MOT3 CASS SRM MOTOR ILL ON AM B...

Page 3: ...2 is turned ON when Q21 s base goes H Q23 SW 5V ON when the base goes L Q24 B U detection ON when the base goes H during B U applied Q25 ACC detection ON when the base goes H during ACC applied Q28 31 P CON SW Q28 is turned ON when Q31 s base goes H Q32 Dimmer SW ON when the base goes H while vehicle small lamps turn on Q33 34 44 Illumination AVR ON when Q44 s base goes H Q36 SW 14V ON when base g...

Page 4: ...els 22 N C O No connection 23 ACC DET I Acc detection terminal Acc detected L Acc not detected H 24 DIMMER I Small detection terminal ON L OFF H 25 SW 5V O 5 V power supply terminal ON L OFF H 26 CH MUTE I Muting request from CH ON H OFF L 27 CH CON O CH control output ON H OFF L 28 CH REQH O Request output to CH Requested L 29 CH RST O Reset output to CH Normal L When the system is reset turns H ...

Page 5: ...hanism detected L Cassette mechanism not detected H 70 AVCONT O AD reference voltage control output Same timing as P ON H during operation 71 Avdd Positive power supply terminal 72 Avss Grounding terminal 73 Avref I Reference voltage supply terminal for A D converter 74 PHONE I PHONE detection terminal TEL MUTE No more than 1 V NAVI MUTE 2 5 V or more 75 R REEL I Cassette mechanism reel pulse inpu...

Page 6: ...tion terminal Back Up detected L Back Up not detected momentary power down H 94 CH DATAC I DATA input terminal from CH 95 CH DATAH O DATA output terminal to CH 96 CH CLK I O CLOCK input output terminal from to CH 97 L DATA L I DATA line from LCD driver 98 L DATA S I O DATA line to LCD driver 99 L CLK I O CLK line to LCD driver Panel detected L 100 N C O Outputs Low No connection ...

Page 7: ...ack Down key jumps to the previous track number to the track being played M T SRT Model Test Mode 7 Audio related specifications A short press of the Q key initiates the audio adjustment mode Pressing the key on the remote initiates the audio adjustment mode Continuous holding of a remote control key is inhibited Bass Middle and Treble are adjusted in 3 steps of Min Center Max with the Track Up Do...

Page 8: ...curity write mode Security related information Forced Power ON mode All models Even when the security Mask key is approved reset ting the unit while holding the ATT and Preset 4 keys makes it possible to turn the power ON for 30 minutes After 30 minutes have elapsed it is not possible to return to the previous condition unless the unit is reset again Method of registration of the security code aft...

Page 9: ... See 1 How to enter the test mode 2 TRANSMIT1 is displayed and the Mask key entry request mode is initiated The display at this time should show in place of 3 Press and hold the key on the Master key remote for more than 3 seconds 4 When TRANSMIT2 is displayed press and hold the key on the Master key remote for more than 3 seconds 5 When APPROVED is displayed the Mask key is cleared the demonstrat...

Page 10: ...enter position BASS center position LOUD OFF DOLBY NR OFF FADER center position TREBLE center position ATTENTION tongue Turn 2 times End of Roller ass y FPC Assembly of FPC Flexible PC board onto Roller ass y Turn Roller ass y by 2 times Hook the end of Roller ass y to the tongue Insert the FPC into the slit of Roller ass y then release the end of Roller ass y and the tongue Adjustment Points Adju...

Page 11: ...93 C308 R347 C224 R338 R358 R359 C191 R330 R335 R172 C256 CP10 CP2 CP3 CP4 CP1 R333 R12 R14 R13 R11 C88 R169 C135 R162 C136 C137 R161 C157 C156 C138 R219 R220 R131 R192 C131 R340 R195 X1 R114 R367 CP9 R196 CP8 C307 C305 R348 R286 R311 E B B E B E B E B E B E B E B E B E B E B E B E B E B E B E B E A8V X2 ILL B 20MHz TEST IC2D IC2C SW5V CLK NOISE IFC PANEL5V 5V SDA SCL PMUTE SVR STBY 4 332MHz NOISE...

Page 12: ...R33 C59 R38 R48 C60 G O I 1 7 14 8 4 3 1 2 D51 Q33 Q18 Q19 Q37 Q43 Q45 Q41 Q27 D32 Q31 Q30 Q29 D81 D82 IC15 IC10 Q21 D1 IC3 D22 Q23 D50 Q72 Q88 Q89 D2 X14 6442 70 J74 1140 12 J74 1397 02 SYNTHESIZER UNIT SYNTHESIZER UNIT X14 6442 7X O N f e R s s e r d d A C I Q 1 Q 5 1 Q 6 3 Q 3 4 Q 3 5 Q 3 6 Q 2 7 Q 3 O N f e R s s e r d d A C I Q 3 O 3 0 1 M 4 5 1 M 4 8 1 O 3 9 1 O 3 1 2 O 3 3 2 N 3 7 2 N 4 9 2...

Page 13: ...022 71 J74 1148 12 C4 W14 R4 C17 C24 31 30 R12 C26 C8 R14 C12 C14 R7 C22 W12 R6 20 21 R8 C23 R11 10 11 1 40 C13 R10 C21 C20 R9 C7 R5 C25 C11 E B R13 R1 C1 W11 R2 C2 R3 C3 IC1 Q1 X87 3022 71 J74 1148 12 PC BOARD Component Side View Refer to the schematic diagram for the values of resistors and capacitors DOLBY UNIT Foil Side View DOLBY UNIT ...

Page 14: ...HT FL 9 10 11 12 16 13 14 15 ACC KRC 791 NAME MODEL No UNIT 2 71 2 72 KRC 791Y KRC V791 A C LINE OUT2 TAPE IN2 OUT REF2 PB OUT2 19 32 K A K C R11 C7 C13 0 1 0 033 5V E C NC 12 7 MODE2 3 5V E 9 F REEL ANODE R REEL 10 11 PON 5V 8 2 1 MOED1 6 MOT G MODE3 4 5 8V 10K VR1 4 7 R13 1K 0 01 47u10 C6 C11 0 1 4700P C17 0 47 C20 1 SUB SUB MOT B 2 3 1 W11 R5 C15 33u10 180 R3 24K C3 470P 1 2 3 4 C5 470P R2 R1 2...

Page 15: ... 15 16 17 18 19 20 21 CD MUTE FL GND 22 23 24 25 RR FR RR FR RL FL FL RL 2 3 10 RL FL RL FL 1 2 9 FR RR FR RR ACC TEL MUTE P CON EXT AMP CONT ANT GND DIMMER 6 7 3 4 5 13 11 12 14 15 8 BUP 16 FR 10u16 C30 360 R10 R37 22K R38 22K 4 3300u16 RL RL FL FL 1u50 C114 15 1 9 5 4 3 6 2 11 10 12 13 8 7 REQ H D GND B U CH CON MUTE A GND RST Rch REQC DATA C DATA H Lch CH CLK 1 2 3 4 5 6 7 8 9 10 11 12 13 REQ H...

Page 16: ...ET XT1 XT2 REGC X2 X1 VSS VDD CLK OUT NC MOTOR MODE 3 MODE 1 MODE 2 NC SUB MOTOR 1 SUB MOTOR 2 SUB MOTOR 3 CAS SRM NC CP9 4 7K CP8 2 2K R364 L10 100K CP7 2 2K R340 2 2K R339 10K R338 1K 2 2K 1K C304 88 96 81 87 82 86 84 85 92 89 91 99 95 94 78 79 CP4 1K 47K R365 R366 47K 1K R359 69 68 67 66 65 R328 100K R326 100K 100K R323 100K 100K 63 R324 53 CP3 1K CP2 4 7K X1 20MHz X2 0 01 C251 27P C302 C301 C3...

Page 17: ...S10 S8 S7 S6 S5 S9 S15 S14 S13 S12 S11 S20 S19 S18 S17 S16 S21 S22 S23 S38 S34 S32 S31 S33 S36 S35 S37 S46 S42 S40 S39 S41 S44 S43 S45 S47 S50 S30 S29 S60 S59 S58 S57 S56 S55 S54 S53 S52 S51 C4 C1 C8 C2 C3 C7 C5 C6 KS1 KS4 KS2 KS3 CP3 1K C11 0 01 10K R16 R5 C4 0 1 C3 0 1 R4 C2 0 1 R3 C5 100 R9 2 2 C7 S49 S48 S25 S24 S50 S46 S47 S48 S49 28 29 30 31 32 S28 S27 S26 79 KI3 78 KI2 KI4 80 KI1 77 KS6 76 ...

Page 18: ...4 X16 X16 246 247 201 259 241 281 222x2 RM1 DC1 RM2 283 219 267 268 753 266 270 271 269 233 714 209 220 304 301 303 302 304 790 ED1 X16 C D 1 2 3 24 23 KRC 791 Y KRC 791 Y EXPLODED VIEW MECHANISM EXPLODED VIEW UNIT Parts with exploded numbers larger than 700 are not suppied A B 1 2 3 Parts with exploded numbers larger than 700 are not suppied 58 56 57 52 53 54 CM1 CM2 25 21 24 45 23 65 65 66 66 67...

Page 19: ...0 04 TORSION COIL SPRING 246 2C G09 2038 04 FORMED WIRE 247 2C G09 2042 04 FORMED WIRE 248 2C G11 1927 04 CUSHION 251 2C G16 1177 04 SHEET H10 4766 12 POLYSTYRENE FOAMED FIXTURE H25 0337 04 PROTECTION BAG 180X300X0 03 H25 1108 04 PROTECTION BAG 100X300X0 03 H25 1111 04 PROTECTION BAG 280X450X0 03 H30 0544 04 ADHESIVE DOUBLE COATED TAPE H54 2332 03 ITEM CARTON CASE H54 2333 03 ITEM CARTON CASE Y 25...

Page 20: ...05 FLAT CABLE CONNECTOR J1 E58 0863 15 RECTANGULAR RECEPTACLE J2 E63 0853 05 PIN JACK J3 E56 0834 05 CYLINDRICAL RECEPTACLE P1 E23 0745 05 TERMINAL WH1 2D E30 4804 05 CORD WITH PLUG H21 1103 04 PROTECTION SHEET H25 1112 04 PROTECTION BAG 280X450X0 03 L1 L33 1039 05 LINE FILTER COIL L3 4 L40 4795 91 SMALL FIXED INDUCTOR 4 7UH J L5 L40 4791 17 SMALL FIXED INDUCTOR 4 7UH K L6 L40 4795 91 SMALL FIXED ...

Page 21: ...03 RK73GB2A471J CHIP R 470 J 1 10W R304 305 RK73GB2A472J CHIP R 4 7K J 1 10W R306 RK73GB2A222J CHIP R 2 2K J 1 10W R307 RK73GB2A225J CHIP R 2 2M J 1 10W R308 309 RK73GB2A102J CHIP R 1 0K J 1 10W R310 313 RK73GB2A103J CHIP R 10K J 1 10W R315 RK73GB2A472J CHIP R 4 7K J 1 10W R321 RK73GB2A104J CHIP R 100K J 1 10W R324 RK73GB2A104J CHIP R 100K J 1 10W R326 RK73GB2A104J CHIP R 100K J 1 10W R328 RK73GB2...

Page 22: ...C9 CK73GB1H103K CHIP C 0 010UF K C11 14 CK73GB1H103K CHIP C 0 010UF K 304 3C E29 1885 04 CONDUCTIVE RUBBER SUB CIRCUIT UNIT X16 118X XX SWITCH UNIT X16 154X XX J1 E59 0835 05 RECTANGULAR PLUG CP1 R90 1016 05 MULTI COMP 470 X4 CP2 3 R90 0724 05 MULTI COMP 1K X4 R1 RK73GB2A433J CHIP R 43K J 1 10W R2 5 RK73GB2A222J CHIP R 2 2K J 1 10W R6 RK73GB2A392J CHIP R 3 9K J 1 10W R7 8 RK73GB2A223J CHIP R 22K J...

Page 23: ...IL SPRING E LEV SP 26 3A D13 1499 08 GEAR FR 27 3A D10 4381 08 ARM FR PLATE 30 2B D10 4382 08 ARM ASSY PINCH ROLLER F 31 2B D10 4383 08 ARM ASSY PINCH ROLLER R 33 2B G01 2961 08 TORSION SPRING SA 34 2B D10 4384 08 ARM SW 44 1A E39 0425 08 LEAD WIRE MOTOR 45 2A J11 0632 08 CLAMPER 48 3B D01 0613 08 FLYWHEEL ASSY 49 3B D16 0616 08 BELT 52 1B D10 4385 08 ARM CASSETTE LIFTER B 53 1B J19 4953 08 CASSET...

Page 24: ...0dB 25 µV LW tuner section Frequency range 153 kHz 281 kHz Usable sensitivity S N 20dB 45 µV Cassetle player section Tape Speed 4 76 cm sec Wow Flutter WRMS 0 08 Frequency response 3 dB 70 µs 30 Hz 20 kHz Separation 1 kHz 43 dB Signal to Noise ratio Dolby NR OFF 57 dB Dolby B NR ON 65 dB Audio section Maximum Output Power 50 W 4 Output Power DIN 45324 B 14 4V 30 W 4 Tone action Bass 100 Hz 10 dB M...

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