KENWOOD KRC-265S Service Manual

KENWOOD KRC-265S Service Manual
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Service Manual for KENWOOD KRC-265S, downloadable as a PDF file.

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Sample pages

CASSETTE RECEIVER

KRC-225/235

SERVICE MANUAL

B51-7854-00 (K) 1748

KRC-265/S

KRC-235

KRC-225

Panel assy

(A64-2505-02)

Plastic cabinet assy

(A02-1486-13)

Lever

(D10-3031-04)x2

Mounting hardware assy

(J21-9491-13)

DC cord

(E30-4783-05):KRC-225/235

DC cord

(E30-4784-05):KRC-265/S

Screw set

(N99-1610-15)

Screw set

(N99-1719-05)

Escutcheon

(B07-2124-02)

Panel assy

(A64-2506-02)

Escutcheon

(B07-2124-02)

Panel assy

(A64-2507-02):KRC-265

(A64-2634-02):KRC-265S

Escutcheon

(B07-2124-02):KRC-265

(B07-3049-02):KRC-265S

CASSETTE RECEIVER

KRC-225/235

SERVICE MANUAL

B51-7854-00 (K) 1748

KRC-265/S

KRC-235

KRC-225

Panel assy

(A64-2505-02)

Plastic cabinet assy

(A02-1486-13)

Lever

(D10-3031-04)x2

Mounting hardware assy

(J21-9491-13)

DC cord

(E30-4783-05):KRC-225/235

DC cord

(E30-4784-05):KRC-265/S

Screw set

(N99-1610-15)

Screw set

(N99-1719-05)

Escutcheon

(B07-2124-02)

Panel assy

(A64-2506-02)

Escutcheon

(B07-2124-02)

Panel assy

(A64-2507-02):KRC-265

(A64-2634-02):KRC-265S

Escutcheon

(B07-2124-02):KRC-265

(B07-3049-02):KRC-265S

KRC-225/235/265/265S

BLOCK

DIAGRAM

IC1

KEY

PAN 5V

MUTE

B.U. DET.

B.U.

ACC

P-CONT.

MUTE

PRE

POWER IC

EQ. AMP.

CH ISO AMP

N.C.MPX

E-VOL.

CD/MD

CHANGER

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

LCD DRIVER

LCD

MAIN

TAPE MECHA.

IC5

1 Lch

2 Rch

PRE OUT

IC2

IC4

IC3 Q150,153

SP OUT

REAR

RST

PAN IN SW

ANT-CONT.

P-CONT.

Q370,371

Q450,451

Q50

Q350-353

Q58-61

Q54-57

Q53

Q320

Q301

Q51,52

IC1

ED1

FM+B

Q200,201

AM+B

Q202,203

AM BPF

FM BPF

SW 5V

COM +B

ILLUMI.

B.U.5V

SYSTEM MI-COM

RST SW

ANT-CONT.

FM ANT

AM ANT

RF GND

FM+B

AM+B

OSC GND

PLL +B

IFC OUT

SDA

SCL

DIG GND

IF1+B

IF1 GND

S-METER

IF2 GND

FM+B

SW5V

ACC DET

B.U. DET

SCL

MUTE

SDA

P CON

ANEL

HOLD

CLK

ATA

FWD/REV

MOT

CON

ATA

REQ

CLK

Rch

COM

Lch

TAPE

MP IN

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

B.U.

CHRST

MUTE

B.U.5V

AM+B

VDD 5V

ACK

ANT CON

CHMUTE

BEEP

SVR

AMP. STBY

SVR

AC GND (BEEP)

Lch

Rch

Lch

1200mV

TAPE :1681mV

CD/MD-CH :3529mV

AM :546mV

FM :1781mV

RF GND

OSC GND

IF2 +B

AUDIO OUT

S-METER

PLL CLK

PLL DATA

HEAD

PLAY

55.6mV

BU5V

SW5V

B.U.5V

AM: 170mV

FM: 400mV

PACK IN

(FF/REW)

AMP. MUTE

FF/REW

BU5V

ILL

P-CONT.

/ANT-CONT.

(X16-)

(X14-)

KRC-265/S

KRC-225/235

KRC-235,265/S

MOTOR SW

Q260,261

ACC. DET.

,Q151

KRC-225/235/265/265S

COMPONENT DESCRIPTION

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

LC72366-9592

System MI-COM.

System control

IC2

TDA7461ND

E-VOL. & N.C. MPX

Controls sound volume. Selects each source.

IC3

HD74HC27FP

Mute logic

3-input NOR gate x 3

IC4

TDA7384A or

Power IC

Amplifies power so that the speaker can drive audio signal.

TDA7386

IC5

LA3161

Equalizer amplifier

Equalizer amplifier for cassette tape sound

2SC2412K or

BACK-UP detection

While BACK-UP is added, a base becomes Hi, and Q50 is

Q50

2SD601A

(Momentary power down

turned on.

detection) SW

Q51

2SB1443

While BACK-UP is added, AVR outputs +5V.

Q52

2SC2412K or

BACK-UP 5V AVR

Q51 and Q52 is inverted Darlington connection.

2SD601A

Q53

DTA114YK or UN2114

P.ON 5V SW

While a base becomes Lo, Q53 is turned on.

or KRA107S

Q54

DTC144EK or UN2213

While Q54's base becomes Hi, Q55 is turned on.

or KRC104S

COM+B SW

Q55

DTA124EK or UN2112

Works during POWER ON mode.

or KRA103S

2SA2057 or 2SB1548

Q56

(P) or 2SB1565(E,F)

While Q57's base becomes Hi, Q56 is turned on.

or 2SB1655(E,F)

COM+B AVR

Q57

2SC2412K or

Q56 and Q57 is inverted Darlington connection.

2SD601A

Q58

DTC144EK or UN2213

While Q58's base becomes Hi, Q59 is turned on.

or KRC104S

Illumination +B SW

Q59

DTA124EK or UN2112

Works during POWER ON mode with a panel attached

or KRA103S

to the set.

2SA2057 or 2SB1548

Q60

(P) or 2SB1565(E,F)

While Q61's base becomes Hi, Q60 is turned on.

or 2SB1655(E,F)

Illumination +B driver

Q61

2SC2412K or

Q60 and Q61 is inverted Darlington connection.

2SD601A

DTC124EK or UN2212

When BACK-UP detection SW or CHANGER RESET SW or

Q150

or KRC103S

Electric volume mute SW

MI-COM.'s mute works, a base becomes Hi, and Q150

is turned on.

Q151

DTC114YK or UN2214

SVR discharge SW

When POWER IC RESET is activated, a base becomes Hi,

or KRC107S

Q151 is turned on.

DTA124EK or UN2112

When BACK-UP detection SW or CHANGER RESET SW or

Q153

or KRA103S

Pre-out mute driver

MI-COM.'s mute works, a base becomes Lo, and Q153

is turned on.

Q200

DTC124EK or UN2212

Q201 is turned on when Q200's base becomes Hi.

or KRC103S

FM +B SW

Q201

2SB1277(Q,R)

Works during FM reception mode.

Q202

DTC124EK or UN2212

Q203 is turned on when Q202's base becomes Hi.

or KRC103S

AM +B SW

Q203

2SB1277(Q,R)

Works during AM reception mode.

¶SWITCH UNIT(X16-1490-XX)

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

IC1

LC75853NE

LCD driver with key-matrix

DTA114EK or UN2111

Key-matrix permission SW Ready on key-matrix

or KRA102S

¶SYNTHESIZER UNIT(X14-6850-XX)

KRC-225/235/265/265S

COMPONENT DESCRIPTION

Ref.No.

Component Name

Application/Function

Operation/Condition/Compatibility

Q260

DTC114YK or UN2214

When Q260's base becomes Hi, Q261 is turned on.

or KRC107S

Motor +B SW

Q261

2SB1443

Works during TAPE mode.

Q301

DTA144EK or UN2113 Changer reset SW

When a base becomes Lo, Q301 is turned on.

Q320

2SA1037K

Panel 5V SW

While a panel is attached to the set, a base becomes Lo, and

Q320 is turned on.

Q350

2SB1277(Q,R)

P-CON. driver

When Q353's base becomes Hi, Q350 is turned on.

Q351

2SA1037K

P-CON. protection SW

Works when P-CON is being short-circuited on GND.

Q352

DTA124EK or UN2112 P-CON. protection

Inhibits protection SW function when P-CON works momentary.

or KRA103S

inhibit SW

Q353

DTC114YK or UN2214

P-CON. SW

Q353 is turned on when a base becomes Hi. Works during

or KRC107S

POWER ON mode.

Q370

2SB1277(Q,R)

Q370 is turned on when Q371's base becomes Hi.

Q371

DTC114YK or UN2214 ANT-CON. SW

Works during TUNER mode.

or KRC107S

Q450

DTC143TK or UN2216 Pre-out mute SW (R ch.)

When BACK-UP detection SW or CHANGER RESET SW or

Q451

DTC143TK or UN2216 Pre-out mute SW (L ch.)

MI-COM.'s mute works, a base becomes Hi, and Q450,451

are turned on.

¶SYNTHESIZER UNIT(X14-6850-XX)

KRC-225/235/265/265S

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin No.

Pin Name

I/O

Description

Processing Operation

XIN

Main clock resonator connection terminal

GND

TEST terminal 2

Connected to GND lines.

L DATA L

Data input from the LCD driver IC

L DATA S

Data output to the LCD driver IC

L CLK

Clock output to the LCD driver IC

L CE

CE output to the LCD driver IC

SDA

I/O Data input/output with the E-VOL. IC

PLL DATA

I/O Data input/output with the F/E

PLL CLK

Clock output to the F/E

SD input from the F/E

Hi : Station detected

DATA C

Data input from changers

DATA H

Data output to changers

CH CLK

I/O Clock input/output with changers

N.C.(Not used)

MOTOR

Cassette motor on/off output

Hi : Motor ON

SCL

Clock output to the E-VOL. IC

17-24

N.C.(Not used)

AM+B

AM+B ON/OFF output

Hi : during AM reception

FM+B

FM+B ON/OFF output

Hi : during FM reception

PACK IN

Cassette tape Pack-in detection input

Lo : Pack-in

FF/REW

FF/REW detection input

Lo : FF/REW, Hi : PLAY

GND

Connected to GND lines.

GND

Connected to GND lines.

VDD

Positive power supply connection terminal Connected to B.U. 5V lines.

REQ C

Request input from changers

Lo : Request

MUTE

Audio mute on/off output

Hi : Mute ON

CH CON

Changer control

Lo : Standby, Hi : ON

REQ H

Request output to changers

Lo : Request

When the momentary power down, after ACC

SVR

Power IC reset terminal

ON/OFF is detected and after POWER OFF,

the output becomes Hi temporarily.

AMP STBY

Power IC standby control output

Hi : POWER ON mode

AMP MUTE

Power IC mute control

Lo : Mute

P CON

Power control

Hi : POWER ON mode

ANT CON

Antenna control

Hi : during FM/AM reception

SW5V

SW 5V control

Lo : POWER ON mode

ILL

Illumination AVR ON/OFF control terminal

Hi : POWER ON mode

N.C.(Not used)

BEEP

BEEP sound output

45-47

N.C.(Not used)

ROLL OFF

Roll off input

Pull down to GND lines. (Not used)

NOISE

Noise canceller input

Pull down to GND lines. (Not used)

CANCELLER

SEL1

Destination input 1

Lo : KDC-225, Hi : KDC-235,265/S

SEL2

Destination input 2

Lo : KDC-265/S, Hi : KDC-225,235

SEL3

Destination input 3

N.C.(Not used)

EQ MUTE

Tape equalizer mute on/off output

N.C.(Not used)

FWD/REV

FWD/REV mode detection input

Lo : REV mode

N.C.(Not used)

REMO

Data input from the remote control

KDC-225/235:Pull up to PON5V lines. (Not used)

light sensor

KDC-265/S:Pull down to GND lines. (Not used)

57-60

N.C.(Not used)

¶Terminal Description ( IC1 : X14-6850-XX)

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