KENWOOD KRC-779R Service Manual

KENWOOD KRC-779R Service Manual
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Service Manual for KENWOOD KRC-779R, downloadable as a PDF file.

We also have owner's manual to this model.

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Sample pages

KRC-709

B NR

LOUD

SCAN

B.S/RDM

REP

MTL/M.RDM

DISP

NAME.S

AUTO

AME

AUD

PROG

DAB

ANG

CLK

PWR OFF

47Wx4

DOLBY B NR

KRC-779R

B NR

LOUD

SCAN

B.S/RDM

REP

MTL/M.RDM

DISP

NAME.S

VOL ADJ

AUD

PROG/PTY

DAB

ANG

CLK

PWR OFF

47Wx4

DOLBY B NR

K3i

KRC-889

B NR

LOUD

SCAN

REP

MTL/M.RDM

DISP

NAME.S

AUTO

AME

AUD

PROG

DAB

ANG

CLK

PWR OFF

47Wx4

DOLBY B NR

B.S/RDM

SIZE AAA

BATTERY

(Not supplied)

KRC-709/779R/RY/889

M&T CASSETTE RECEIVER

SERVICE MANUAL

2001-2 PRINTED IN KOREA

B51-7749-00 (K) 3395

KRC-709

The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05.

Please refer to the service manual for model D40-1122-05(B51-7452-00).

DC cord

(E30-4942-05)

Remote com. assy

(A70-0886-15)

Antenna adaptor

(T90-0523-05)

Screw set

(N99-1704-05)

Stay

(J54-0606-04)

Torsion coil spring

(G01-2924-04)

Lever

(D10-4562-04)x2

Mounting hardware assy

(J21-9716-03)

Plastic cabinet assy

(A02-1497-03)

DC cord

KRC-709:(E30-4940-05)

KRC-889:(E30-4939-05)

Remote com. assy

(A70-0883-05)

Escutcheon assy

(B07-3010-02)

Bracket L

(J19-5051-03)

Screw set

(N99-1652-05)

Front glass

(B10-3237-01)

Escutcheon assy

(B07-3007-03)

Panel assy

(A64-2130-02)

MASK-key

RC-500

Bracket R

(J19-5052-03)

KRC-779R/RY

KRC-709,889

KRC-779R/RY

KRC-889

Front glass

(B10-3242-01)

Front glass

(B10-3239-01)

Panel assy

(A64-2134-02)

Panel assy

(A64-2132-02)

Escutcheon assy

(B07-3007-03)

Escutcheon assy

(B07-3007-03)

40%

KRC-709,779R/R

Y,889

BLOCK

DIAGRAM

AUDIO

S-METER

AFC

IFC OUT

PLL DATA

PLL CLK

SW5V

TAPE

CHANGER

S METER

QUAL

SDA

SCK

S MUTE

A 8V

MODE 2

SUB-

MOT+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

PACK IN

SRM

SW2

SRM

SW1

RCLK

QUAL

RDATA

NOISE

S METER

AFC

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

PACK IN

SRM

SW3

SRM

DET

RESET

SUB

MOT2

SUB

MOT1

SUB

MOT3

CASS/SRM

MOT

ILL

AM+B

FM+B

SCK

SDA

PRE MUTE

MUTE

BEEP

P MUTE

ACC DET

PHONE

DIMMER

EXT AMP CONT

P CON

PAN5V

P ON

ANT CONT

B.U DET

SW5V

CH MUTE

CH RST

DATA H

DATA C

CH CON

REQ C

CH CLK

REQ H

BACK UP

1200mV

440mV

A 8V

SW5V

PANEL5V

B.U.5V

PANEL5V

FL+B

FAC

SUB+

SUB-

SUB+

SDA

SCK

MOT+B

FOR VFD

A8V

-B

FOR 4.5V PRE

PAN5V

B.U.5V

SW5V

MUTE

AUX

BACK UP

SW5V

B.U.5V

-B

1800mV

TAPE

3600mV

855mV

1372mV

600mV

3600mV

1800mV

E TYPE K TYPE

1800mV

2250mV

1715mV

4500mV

1069mV

TAPE

E TYPE

ILL

TEL MUTE

ACC

ANT CON

P CON

BACK UP

EXT.AMP CONT

F/E

FM+B

BUFFER

NOISE

BUFFER

DECODER

RDS

IC11

Q73

IC2

E-VOL

MPX

N.C.

AM+B

CASSETTE MECH

SYSTEM U-COM

IC1

CD-CHANGER

MD-CHANGER

KEY

MATRIX

RESET

LCD

DRIVER

REMO

G/R SW

RESET

IC15

X13-996/999

SYSTEM u-COM

LCD TYPE

IC1

U-COM

MATRIX

RESET

LCD

IC1

X13-995/998

KEY

REMO

PANEL

G/R SW

V-ILL TYPE

LCD

DRIVER

IC2

VFD(GRADATED)

RESET

X13-994/997

REMO

MATRIX

KEY

G/R SW

U-COM

IC1

PANEL

FL(GRADATED) TYPE

ROM

SPEANA

BPF

DRIVER

SUB MOT

IC13

E S

SYSTEM

IC5

ONLY FL MODEL

MAIN MOT

SUB MOT

Q42

Q37,38

DC/DC

ONLY FL MODEL

Q33,34

ILL AVR

ONLY FL MODEL

DC/DC

A 8V

Q20

IC6

SW14V

Q36

EXT AMP CONT

DIMMER

ACC DET

TEL MUTE

P CON

B.U DET

ANT CON

Q39

Q32

Q25

Q26

Q28

Q24

SW5V

B.U.5V

PAN5V

Q45

Q23

Q21,22

SRM

MECH

POWER IC

THEMO

PROTECT

IC4

IC10

MUTE LOGIC

DRIVER

MUTE

Q1-6

ONLY FL MODEL

4.5V

PRE AMP

IC7-9

SP OUT

1.8V PRE OUT

4.5V PRE OUT

LCD

251mV(ETYPE)

470mV(KTYPE)

FM:

AM:

230mV

KRC-709,779R/RY,889

Component

Purpose · Function

Operation · Conditions · Compatibility

IC1

System u-com

IC2

E-VOL, N.C, MPX

IC3

Regulator IC for Audio 8V

IC4

Power IC

IC10

Mute logic IC

IC11

RDS decoder

IC13

Motor driver IC

IC15

Reset IC

Q1~4

PRE OUT MUTE SW

Pre outs are muted when the base goes "H".

Q18~20

Audio 8V AVR

Inverted darlington connection

Q20 is turned ON when Q18's base goes "H".

Q21, 22

B.U 5V AVR

Inverted darlington connection

Q22 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.

Q26, 27

P-ANT SW

Q26 is turned ON when Q27's base goes "H".

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 goes "H".

Q37, 38

Motor driver supply

Q38 is turned ON when Q37's base goes "H".

Q39

External Amp Control

ON when the base goes "L".

Q41, 42

Cassette mecha main motor

Q42 is turned ON when Q41's base goes "H".

supply SW

Q43

Motor driver's voltage SW

Base "H" ··· cassette mecha's submotor

Base "L" ··· mask mecha's motor.

Q45, 46

Panel 5V SW

Q45 is turned ON when Q46's base goes "H".

Q71

Pre out mute driver

ON when the base goes "L".

Q72

E-VOL Mute SW

ON when the base goes "H".

Q73

Noise buffer

Q85

IFC out buffer

Q86, 88

AM+B SW

Q88 is turned ON when Q86's base goes "H".

Q87, 89

FM+B SW

Q89 is turned ON when Q87's base goes "H".

Q90

Composite out buffer

KRC-709,779R/RY,889

COMPONENT DESCRIPTION

(X14-644x-xx)

(X14-6452-73)

Component

Purpose · Function

Operation · Conditions · Compatibility

IC1

LCD Driver with Key Matrix

IC2

Remote Control IC

Key Detection SW

Q2 starts key scan in M&T.

Q3, 4

Key Illumination SW

Lights key illumination in Red when the base of Q3 is ON.

Lights key illumination in Green when the base of Q4 is "H"

VLCD Reference Voltage Supply

Constant voltage circuit.

Remote Control IC Power Supply

Activates remote control when the base of Q6 is "L"

Dimmer SW

The base of Q7 is normally "H" but becomes "

" when DIMMER is ON.

(X13-9960-10)

(X13-9992-73)

(X87-3022-71)

(X87-3032-73)

Component

Purpose · Function

Operation · Conditions · Compatibility

IC1

Playback EQ, Dolby & Blank Detection

Constant Switching in Blank Detection

Switches the time constant according to the PLAY or FF/REW mode.

KRC-709,779R/RY,889

MICROCOMPUTER'S TERMINAL DESCRIPTION

Name

I/O

Purpose

Operation Description

AM+B

AM power supply terminal.

During AM operation: H.

FM+B

FM power supply terminal.

During FM operation: H.

Last FM with RDS model: H

AFS

Constant switching when noise is detected.

During FM seek or AM search: L.

During reception: H.

PLL-DATA

I/O DATA input/output terminal from/to F/E.

PLL-CLK

I/O CLOCK input/output terminal from/to F/E.

Evdd

Positive power supply terminal.

GND

Grounding terminal.

N.C

No connection.

BEEP

Beep output terminal.

REMO

Remote control input terminal.

P-ON

SW 14 V control terminal.

Power ON: H. Power OFF: L.

P-STBY

Power IC STBY terminal control.

Power IC OFF: L. Power IC ON: H.

During reset: Input.

IC2-SDA

I/O IC2 DATA line.

IC2-SCK

IC2 CLOCK line.

P-MUTE

Power IC muting terminal.

Power OFF: L. All OFF: L.

During TEL muting: L.

PRE-MUTE

Pre-Out muting terminal.

During momentary power down: L.

DIMMER CON

Dimmer control.

DIMMER: Pulse control.

DIMMER OFF: H.

TEST

Test pin.

P-CON

Power control terminal.

Power ON: H. Power OFF: L.

ANT-CON

Antenna control terminal.

TUNER, TI ON: H

ON: Open. OFF: L.

MUTE

Muting terminal.

The time constant is 0.48 ms with all

models.

N.C

No connection.

ACC-DET

Acc detection terminal.

Acc detected: L. Acc not detected: H.

DIMMER

Small detection terminal.

ON: L. OFF: H.

SW-5V

5 V power supply terminal.

ON: L. OFF: H.

CH-MUTE

Muting request from CH.

ON: H. OFF: L.

CH-CON

CH control output.

ON: H. OFF: L.

CH-REQH

Request output to CH.

Requested: L.

Normal: L. When the system is

CH-RST

Reset output to CH.

reset,turns H then L in 400 ms after

recovery from reset.

L 40 ms: Bass boost OFF.

EXT-AMP-CONT

External amplifier control terminal (In 200 ms).

L 70 ms: Bass boost LOW.

L 100 ms: Bass boost HIGH.

RESET

Reset input terminal

Normal: H. Reset: L.

XT1

Sub-clock connection terminal.

The clock count is active even when

Power is OFF.

XT2

Sub-clock connection terminal.

REGC

Output terminal for the capacitor in the

regulator in u-COM.

Power ON: Oscillated.

Main clock connection terminal.

Power OFF or momentary power

down: Oscillation stopped.

UPD703033GC050 (IC1: X14)

SYSTEM MICROCOMPUTER

KRC-709,779R/RY,889

MICROCOMPUTER'S TERMINAL DESCRIPTION

Name

I/O

Purpose

Operation Description

Main clock connection terminal.

Vss

Grounding terminal.

Vdd

Positive power supply terminal.

CLKOUT

Internal System Clock output.

N.C

No connection.

MOTOR

Cassette mechanism main motor

When the motor is running: H.

output terminal.

When it is stopped: L.

MODE3

Cassette mechanism mode detection terminal.

MODE1

Cassette mechanism mode detection terminal.

MODE2

Cassette mechanism mode detection terminal.

N.C

Outputs Low. No connection.

SUB1

Sub-motor output terminal (1).

SUB2

Sub-motor output terminal (2).

SUB3

Sub-motor output terminal (3).

CAS/SRM

Cassette mechanism/SRM mechanism

Cassette mechanism: H.

voltage switching terminal.

SRM mechanism: L.

N.C

Outputs Low. No connection.

N.C

Outputs Low. No connection.

ILL-ON

FL +B output terminal.

ON: H, OFF: L

PAN-5V

Panel 5 V control terminal.

N.C

Outputs Low. No connection.

BVdd

Positive power supply terminal.

BVss

Grounding terminal.

TYPE1

Destination type switching port.

TYPE0

Destination type switching port.

N.C

Outputs Low. No connection.

N.C

Outputs Low. No connection.

ST TYPE1

IC2 destination type terminal.

Default: L.

ST TYPE0

IC2 destination type terminal.

Default: L.

SRM-SW1

Panel position detection switch 1.

Normal: H. Reset: L. Panel detached: L.

PAN-RESET

Reset output to Panel u-COM.

Momentary power down: L.

Microcomputer overrun: L.

L CE

I/O CE terminal for LCD driver.

SRM-SW3

Panel position detection switch 3.

SRM-SW2

Panel position detection switch 2.

FWD/REV

TAPE EQ input switching terminal.

FWD: L. REW: H.

During TAPE PLAY: H.

Constant switching terminal in case

During TAPE FF/REW or other than

MS-CONT

I/O

TAPE input: L.

of blank detection.

Cassette mechanism detected: L.

Cassette mechanism not detected: H.

AVCONT

AD reference voltage control output.

Same timing as P-ON. H during

operation.

Avdd

Positive power supply terminal.

Avss

Grounding terminal.

Avref

Reference voltage supply terminal for

A/D converter.

PHONE

PHONE detection terminal.

TEL MUTE: No more than 1 V.

NAVI MUTE:2.5 V or more.

R-REEL

Cassette mechanism reel pulse input (REV).

Vth = 2.5 V.

UPD703033GC050 (IC1: X14)

SYSTEM MICROCOMPUTER

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KENWOOD KRC-779R Service Manual

Manual details

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