Kenwood KCAR-70-FM Service manual

FM STEREO MODULATOR

KCA-R70FM

SERVICE MANUAL

DC cord assy (E30-4733-08)

Panel assy (A64-3096-08)

P

W

O

S

R

F

R

F

C

SRCH/ MENU

1

S

C

A

N

2

R

D

M

3

R

E

P

4

5

M

.

R

D

M

6

D

I

S

P

Cord with plug (ANT) (E30-4310-08)

A

N

P

O

IN

W

P

E

U

R

T

Metallic cabinet (A01-2819-08)

T

.

C

O

F

N

M

F

T

R

S

R

8

E

7

T

Q

O

.

8

7

U

E

8

/

L

E

.

8

R

7

L

N

7

9

/

.

E

C

E

8

9

7

8

Y

/

O

R

.

8

:

9

8

(

9

M

/

.

M

1

9

8

H

/

9

z

8

O

.

1

)

8

/

.

D

3

8

9

/

U

.

8

K

E

N

W

3

L

8

/

.

A

5

8

9

T

.

5

O

D

C

O

R

P

O

M

R

ADE IN JAP

A

T

R

I

O

N

AN

D

IS

IN

P

.

U

T

IN

P

U

T

Cord with din connector (E30-4309-08)

Unit holder (J19-5236-08)

Accessory (W01-0763-08)

Remote controller assy (A70-2039-05)

RC-513

SIZE AAA BATTERY (NOT SUPPLIED)

KCA-R70FM

BLOCK DIAGRAM

ACC

BATT

GND

CN1

KEY MATRIX

CN1

IC1

AVR

(+6.6V)

CN101

Q1,6

ACC DETECTION

IC1

71-75,77-80

LCD DRIVER

96-100

RESET DRIVER

1-70

85 84

Q4,5

+5.2V

LCD1

VDD

IC2

REMOTE SENSER

IC2

HOLD

VDD

P ON PLL

15-18,27,56

67

u-COM

31

54

8-13 36 45

29,30,60

75,78

CD-CH

13P

CN102

SIGNAL (L/R)

+V(RF STAGE)

+V(AUDIO)

IC101

ISOLATION AMP.

2nd. L.P.F.

Q308

MODE 1,2

IC102

IC4

AVR(+5.6V)

EMPHASIS

Q101,201

CH-CONTROL

ALC DRIVER

RIPPLE FILTER

IC301

FM-St. MODULATOR

MPX

IC302

ALC DETECTION AMP

Q310

MODE 1,2

Q306, 307

PILOT MIX

Q304,305 LEVEL CONTROL Q309 AUDIO MUTE

RF STAGE

RL1

CN104

ANT IN

CN105

To RADIO

2

KCA-R70FM

COMPONENTS DESCRIPTION

● RF MODULATOR UNIT

Ref. No.

IC1 UPC78M06AHF BU 5V AVR While BACKUP is applied, AVR outputs +5V. IC2 LC72366-9B28 System MI-COM. System control IC4 NJM78L05UA 5V AVR Power supply for FM modulator and RF amplifier IC101 NJM2060M Isolation amp. IC102 NJM4565MD Low pass filter IC301 BA1405F FM ST modulator

IC302 NJM4565MD

Q1 DTC124EK ACC detection When Q4 is turned on , Q1 is turned on during ACC applied. Q2 2SA1782(T,U) Q3 DTC124EK working.

Q4 DTC143TK Reset SW

Q5 DTC143TK CH RESET SW

Q6 DTA124EK Hold detection SW

Q8 DTC143TK Relay driver

Q9 2SC4640(T,U) Ripple filter Power supply for RF amplifier Q101 2SK2158 Q201 2SK2158 Q303 2SA1162(GR) Pilot mix amp. Q304 2SK2158 Level control SW Level 1/2 : OFF, Level 3/4 : ON Q305 2SK2158 Level control SW Level 2/4 : OFF, Level 1/3 : ON Q306 2SK508L RF oscillator buffer Q307 2SC2714(Y) RF amp. Q308 2SK2158 Mode (1/2) SW Mode1 : ON, Mode2 : OFF Q309 2SK2158 Audio mute POWER ON mode : OFF, POWER OFF mode : ON Q310 2SK2158 Mode (1/2) SW Mode1 : OFF, Mode2 : ON

Component Name Appication / Function Operation / Condition / Compatibility

1/2 VCC driver, ALC detection amp.

When Q3's base goes “Hi”, Q2 is turned on, and RF modulator circuit is

POWER SW

When RESET SW on display unit is pressed, Q4,Q1 and Q6 are turned off, and IC2 is holding. When RESET SW on display unit is pressed, Q5 is turned off, and SYSTEM RESET signal is outputted to CD changer. When RESET SW on display unit is pressed or ACC is OFF, Q6 is turned off, and IC2 is holding. FM modulator output / Vehicles antenna input switching. When a base goes “Hi”, FM modulator output is selected.

ALC control SW

● CONTROL UNIT

Ref. No.

IC1 LC75808W LCD driver with key-matrix IC2 RS-21N Remote control light senser Q1 2SD2114K LED ON/OFF SW Q2 DTA144EK Key-matrix permition SW Ready on key-matrix Q3 DTA144EK IC2 ON/OFF SW

Component Name Appication / Function Operation / Condition / Compatibility

3

KCA-R70FM

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER (IC2 : RF MODULATOR UNIT)

Pin No. Pin Name I/O Terminal name Description

1 XIN I X IN X_tal 2 TEST2 - GND Ground connection terminal 3~5 PG3~1 O NC Not used (pull down to GND lines.) L 6 PG0 I GND Connected to GND lines. 7 PF3 O NC Not used (open) L 8 PF2 I REQC CD-Chenger REQC (Active “Low”)- 9 PF1 O REQH CD-Chenger REQH (Active “Low”)H 10 PF0 O CHCON CD-Chenger ON L 11 SI2 I CH_DATA_C CD-Chenger DATA in 12 SO2 O CH_DATA_H CD-Chenger DATA out L 13 SCK2 O CH_CLK CD-Chenger DATA SCK (Active “Low”)H 14 PE0 O NC Not used (open) L 15 PD3 O LCD DATA out LCD Driver DATA out L 16 PD2 O LCD CLK LCD Driver CLK out L 17 PD1 O LCD RESET LCD Driver RESET out L 18 PD0 O LCD CE LCD Driver CE out L 19~26 PC3~PB0 O NC Not used (open) L 27 PA3 I LCD DATA in LCD Driver DATA in 28~30 PA2~0 I NC Not used (pull down to GND lines.) 31 VDD - Vdd 5V 32 PQ0 O NC Not used (open) L 33~44 PP3~PN0 O GAIN12~1 Modulation output switching L 45 PM3 O SEP-ATT When it has GAIN5 output, “Hi” output L 46~52 PM2~PL0 O NC Not used (open) L 53 PK3 O RELAY Antenna relay control output terminal L 54 PK2 O P-on P_ON L 55 PK1 O MUTE Mute output terminal for the Tuner frequency change L 56 INT0 I REMOCON Remote controller signal input 57~60 PJ3~0 O NC Not used (open) L 61~66 PI1~PH0 I NC Not used (pull down to GND lines.) 67 HOLD I HOLD ACC detection (Operation in HOLD “Low”)L 68 SNS I Vdd Vdd 69 LCTR I NC Not used (pull down to GND lines.) 70 HCTR I NC Not used (pull down to GND lines.) 71 EO3 O NC Not used (open) Hi-Z 72 SUBPD O NC Not used (open) Hi-Z 73 VDD - Vdd Vdd 74 AMIN I NC Not used (pull down to GND lines.) 75 FMIN I VCO in VCO input -

Operation in HOLD

4

KCA-R70FM

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Terminal name Description

76 VSS - Vss Vss 77 EO2 O NC Not used (open) Hi-Z 78 EO1 O Error out Phase Detector Error output Hi-Z 79 TEST1 - NC Not used (pull down to GND lines.) 80 XOUT O X-out X-tal -

● LCD-DRIVER (IC1 : CONTROL UNIT)

Pin No. Pin Name I/O Terminal name Description

82 P1 O KEY-ON PANEL key matrix compulsory ON control terminal L 83 P2 O NC Not used (open) L 84 P3 O ILLMI Display panel illuminations Control ter minal L 85 P4 O REMO-ON Power supply control terminal for remote control H

Operation in HOLD

ADJUSTMENT

RF MODULATOR UNIT

1. DC balance adjustment (VR301) While observing the waveform with an oscilloscope at pin 13 of IC301, adjust VR301 to minimize the waveform level.

2. PLL control voltage adjustment (VC301) First set the transmission frequency to *87.9MHz with the commander, then adjust VC301 so that the DC Voltage at the + pole of C317, measured using a multi-meter or digital tester, is +3V (±0.1V). * Note : E type is 87.7MHz.

3. Modulation level adjustment (VR303) The method uses a standard receiver or tuner. Adjust VR303 so that the output level from the standard receiver or tuner is as specified.

5