Kenwood KRC-108S, KRC-165, KRC-189 Service Manual

CASSETTE RECEIVER

KRC-108S/165/189

(REVISED)(X14-943/936)

SERVICE MANUAL

• This service manual It is only for X14-943/936.

• X14 Except Please refer to the following service manual. KRC-108S : B51-7576-00

KRC-165 : B51-7855-00 KRC-189 : B51-7674-00

BLOCK DIAGRAM

(X14-943/936)

RF GND

FM ANT

AM ANT RF GND

FM +B

AM +B

OSC GND OSC GND OSC GND OSC GND

PLL +B

IFC OUT

SDA

SCL

DIG GND

VDD 5V

IF2 GND

IF2 +B

AUDIO OUT

S-METER

IF1 +B

IF1 GND

CASSETTE MECHA

MAIN

PACK

FWD

REV

T-MUTE

(FF/REW)

COM

PLAY

HEAD

Q200,201

FM+B

Q202,203

AM+B

400mV 170mV::FMAM

IC5

Lch COM Rch

Q260,261

MOTOR SW

EQ. AMP

TAPE

FM BFP

IC1

FM+B

AM+B

TUN SDA TUN SCL

SD TUN SMETER

B.U

55.6mV

(X16-150 : KRC-165) (X13-966 : KRC108S/189)

FF/REW

PACK IN

LED

SYSTEM u-COM

FWD/REV

MOTOR

KEY

KS0-KS4

AMP.STBY

AMP.MUTE

ANT CON ACC DET

B.U DET

P CON

KI0-KI3

SEG1-SEG22

COM1-COM3

ED1

7SEG LED RST IC

IC6

RST SW

SDA SCL

BEEP

SVR

MUTE

PON

BU5V

ILL

RESET

Q301

LAMP

BU5V

RST

IC2

MPX

LEVEL MP IN

SDA SCL

Lch

BU5V

Rch

MUTE

BU5V

E-VOL. N.C.MPX AMP

SMUTE

IC3 Q150,

Q53

Q54-57

Q58-61,63

Q51,52

OUT LF

OUT RF

OUT LR

OUT RR

153

SW5V

ILLUMI

BU5V

B.U

S/No. 30900001

IC4,Q151

POWER IC

STBY SVR MUTE AC

Q450,451

EXCEPT KRC-108S

Q355,370,371

ANT-CONT

Q62

ACC DET.

Q50

Q350-354

PRE

MUTE

TAP E

B.U DET

P.CONT.

KRC-108S/189/165

SP OUT

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

1781mV

546mV

1681mV

ANT-CONT

P-CONT.

ACC

B.U

Lch

Rch

REAR PRE OUT

KRC-108S/165/189

(REVISED)

COMPONENTS DESCRIPTION

● SYNTHESIZER UNIT (X14-943/936)

Ref. No. Application/Function Operation/Condition/Compatibility

IC1 System µ-com System control IC2 Electronic volume Controls on volume and selection of various sources IC3 Logic IC for muting Mute control IC4 POWER IC Amplifier for speaker output IC5 EQ AMP Equalizer amp for the cassette player IC6 RESET IC IC for Power ON Reset Q50 BU DET SW “H” output when backup voltage is 9.2V or less Q51,Q52 BU 5V Driver Turned on when backup is turned ON. Q53 P-ON5V SW On while power is turned ON. (Except ALL-OFF) Q54,Q55 8V SW On while power is turned ON. (Except ALL-OFF) Q56,Q57 8V Driver On while power is turned ON. (Except ALL-OFF) Q58,Q59 ILL+B SW On while power is turned ON. Q60,Q61 ILL+B Driver On while power is turned ON. Q62 ACC DET SW “H” output when ACC is OFF. Q63 ILL+B error prevention SW Turned ON with “H” after µ-com port is set. Q150 Electronic volume MUTE SW IC2 is muted when Back Up is detected or Reset and µ-com mute is detected. Q151 SVR forced discharge SW When P-MUTE is ON (conditional), SVR discharge. Q153,Q450,Q451 Pre Out MUTE SW Pre Out is muted when back up is detected or Reset and µ-com MUTE are detected. Q200,Q201 FM+B SW On in FM MODE Q202,Q203 AM+B SW On in AM MODE Q260,Q261 MOT+B SW On in TAPE MODE Q301 RESET logic reverse SW “H” output when RESET SW is ON. Q350,Q353 P-CON Driver SW Off when Power OFF and ALL OFF. Q351 P-CON protection SW On when P-CON shorts with GND. Q352 P-CON protection prohibited SW Protection switch is prohibited only at the moment when P-CON is turned ON. Q354 P-CON error prevention SW Turned ON with “H” after µ-com port is set. Q355 ANT-CON error prevention SW Turned ON with “H” after µ-com port is set. Q370,Q371 ANT-CON Driver SW When tuner is ON.

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER : M37560MFD904FP (X14 : IC1)

Pin No. Pin Name I/O Application

1NC -

2 VL1 I Power source input for LCD 3~5 KI0~KI2 I Key return input 6~9 KS0~KS3 O Key scan output

10 TUN_SMETER I S-meter detection terminal 11 KS4 O Key scan output 12 BEEP O Beep output 13 NC O Not used 14 MOTOR O Mechanism motor ON/OFF H : Mechanism motor ON 15 FF/REW I Mechanism FF/RWD detection L : FF/RWD detected for MUTE 16 PACKIN I Mechanism PACK-IN detected TAPE IN : L, NO TAPE : H 17 KI3 I Key return input 18 FWD/REV I

19~25 NC O Not used

Detection for mechanism playing direction

Truth Value

Table

H : FWD, L : REV

Processing Operation Description

KRC-108S/165/189

(REVISED)

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

26 SD I Station detected H : Station detected 27 TUN_SCL O Clock output for F/E 28 TUN_SDA I/O Data input/output for F/E 29 IFC O Not used 30 AM+B O Power output for AM H : AM+B ON 31 FM+B O Power output for FM H : FM+B ON 32 SCK O Clock output for IC2 33 SDA I/O Data input/output for IC2 34 NC O Not used 35 RESET I Reset input Normal : H, RST : L 36 NC O Not used Not used (but Pull down at 10K) 37 NC O Not used 38 XIN - Clock input 8.000MHz (L77-2032-05) 39 XOUT - Clock output 40 Vss - Power input (0V) 41 IC2TYPE1 I IC2 setting switching 42 IC2TYPE2 I IC2 setting switching 43 NC O Not used

44,45 SEL1, SEL2 I Destination switching q

46 MUTE O Mute ON/OFF H : MUTE ON 47 STBY O POWER IC standby control POWER IC ON : H, OFF : L 48 SVR O POWER IC SVR control When reduction inpower is detected : H, Normal : L 49 ACCDET I ACC detection ACC detected : L, ACC not detected : H 50 BUDET I Instantaneous reduction BU detected : L, BU not detected (Instant reduction) : H 51 PNCMUTE O Power IC mute L : MUTE ON, POWER OFF and ALL OFF : L 52 ANTCON O External antenna control H : ANTCON ON 53 PNCCON O Power control output H : P-CON ON 54 ILLCON O Illumination control H : Backlight ON 55 PORT ON/OFF O Port control For error prevention when µ-com is unstable. Output : L

56 SW5 O 5V-system power source control

57 EQNCMUTE O Not used 58~68 NC O Not used 69~90 SEG22~SEG1 O LCD segment output

91 Vcc - Power input (5V)

92 VREF - A/D standard voltage input

93 Avss - Analog power input (Vss) GND connection

94 NC - Not used 95~97 COM3~COM1 O LCD common output

98,99 VL3,VL2 I LCD power input

100 C2 - Not used

Truth Value

Table

L : ON, HI-Z : OFF (H during instantaneous reduction, L when power consumption is low other than instantaneous reduction.

Processing Operation Description

Truth V alue Table q

Destination SEL1 SEL2

KRC-108S L L

KRC-165/189 L H

RX-290 H X

X : Not applicable (PULL DOWN in effect)

A B C D E

KRC-108S/165/189

PC BOARD (FOIL SIDE VIEW)

(REVISED)

SYNTHESIZER UNIT X14-9430/9360-xx (J74-1617-02)

Q56

Q61

C57

CN1

D56

R67

Q60

R64

R251

R63

Q57

R62

Q58

R111

C251

W80

D55

Q59

R65

R66

W76

W77

W75

W115

Q53

R60 R61

W81

R14

C600

W46

100

W36

C161

R371

W45

W44

R107

W41

W120

C162

Q370

D150

W43

R132

R103

R102

R101

R15

D151

D152

R158

R156

R119

W39

W88

W38

W112

R151

W37

W108

R130

W34

R153

W118

R154

W40

C13 C14

W30

W32

W33

C601

C160

R155

W35

W31

R118

R114

R108

W26

R152

C150

R157

R129

R109

R301

TH1

R16

W29

R128

C159

Q151

W28

W27

R114

R115

W87

W110

W25

W24

W107

R69

R113

W109

R13

W111

C151

C104

W23

R300 R303 R302

C18

IC6

D13

C16

W17 W18

C152

W22

R110

C15

W106

C164

C60

B E

Q301

W19

D1 D1 D1

W48

R126

R124

R123

R121

C50

W65

D370

D350

D51

C53

R54

Q50

R68

R127

R125

W62

R52

W67

C103

R122

W63

C52 R57

Q62

W66

R50

C102

50 51

W64

R350

R55

D52

W61

W60

R370

/W83

D351

R353

W114

R131

R133

W59

W57

Q353

C352

W58

W56

W55

D371

Q350

R352

W54

IC1

IC4

R351

Q352

W52

W53

W50

C350

C351

D352

W51

R117

W113

Q351

W49

R112

W121

R372

R373

Q371

W47

D50

Q55

W74

C58

W78

C56

W79

IC5

C10

R5 R3

Q52

Q54

Q51

W73

R250

C250

D53

W72

W85

R59

W86

C54

C55

W70

R58

D54

W69

R120

W68

Q354

EBEBEB

R340

Q63

Q355

C101

PL2

PL1

ED1

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