Kenwood KRC-19A/G, KRC-289, KRC-19G, KRC-19A Service Manual

CASSETTE RECEIVER

KRC-19A/G

SERVICE MANUAL

© 2000-11 PRINTED IN KOREA
B51-7688-00 (K) 1755

KRC-289

AUD

1

23456

CLK

ATT

SRC

PWR
OFF

AME ADJAUTO

T.C/D.SCN

LOUD

CRSC

A.ADJ

FM

AM

FF

REW

PR OG

KRC-289

CD/MD-CHANGER CONTROL

AUD

1

23456

CLK

ATT

SRC

PWR
OFF

AME ADJAUTO

T.CALL

LOUD

CRSC

A.ADJ

FM

AM

FF

REW

PR OG

KRC-19

AUD

1

23456

CLK

ATT

SRC

PWR
OFF

AME ADJAUTO

T.CALL

LOUD

CRSC

A.ADJ

FM

AM

FF

REW

PR OG

KRC-19

REP

RDMSCAN

M.RDM

DISC

+

-

HIGH POWER

40Wx40Wx4

HIGH POWER

40Wx40Wx4

HIGH POWER

40Wx40Wx4

ANTENNA ADAPTOR
(T90-0523-05
or T90-0534-05)
: KRC-19A/G

DC CORD
(E30-4784-05):KRC-289

STAY
(J54-0606-04):KRC-289

SCREW SET
(N99-1610-15)
: KRC-289

PLASTIC CABINET ASSY
(A02-1486-13)

LEVER x2
(D10-3031-04)

MOUNTING HARDWARE ASSY
(J21-9491-13)

KRC-289

KRC-19G

KRC-19A

SCREW SET
(N99-1632-05)
: KRC-289

DC CORD
(E30-4790-05):KRC-19A/G

40%

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TEL

13942296513

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IC1

KEY

PAN 5V

MUTE

B.U. DET.

B.U.

ACC

P-CONT.

MUTE

PRE

POWER IC

EQ. AMP.

CH ISO AMP

NC/MPX

E-VOL.

CD/MD
CHANGER

FRONT Lch

FRONT Rch

REAR Lch

REAR Rch

J2

LCD DRIVER

LCD

MAIN

TAPE MECHA.

IC5

1 Lch

2 Rch

PRE OUT

IC2

IC4

IC3,Q153

SP OUT

REAR

J4

RST

PAN IN SW

ANT-CONT.

P-CONT.

J2

Q370,371

Q450,451

Q50

Q350-353

Q58-61

Q54-57

Q53

Q320

Q301

Q51,52

J5

IC1

ED1

FM+B

Q200,201

AM+B

Q202,203

AM BPF

FM BPF

SW 5V

8V

ILLUMI.

B.U.5V

SYSTEM u-COM

RST SW

ANT-CONT.

FM ANT
AM ANT
RF GND

FM+B

AM+B
OSC GND
OSC GND
OSC GND

VT

PLL +B

IFC OUT

SDA
SCL

DIG GND

IF1+B

IF1 GND

S-METER

IF2 GND

SD

FM+B

SW5V

ACC DET

B.U. DET

SCL

MUTE

SDA

P CON

PANEL

HOLD

L CLK

L DATA S

L DATA L

FWD/REV

MOTOR

CH CON

DATA H

DATA C

REQ H

REQ C

CH CLK

Rch

COM

Lch

TAPE

MP IN

AM

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.

8V

B.U.

CHRST

S MUTE

8

4

10

B.U.5V

AM+B

VDD 5V

PACK IN

L CE

ANT CON

CHMUTE

BEEP

SVR

AMP. STBY

SVR

AC GND (BEEP)

Lch Lch

Rch

Lch

1200mV

TAPE :1681mV
CD/MD-CH :3529mV

AM :546mV

FM :1781mV

8V

RF GND

OSC GND

IF2 +B

AUDIO OUT

8V

S-METER

SD

PLL CLK

PLL DATA

HEAD

PLAY

R

55.6mV

BU5V

SW5V

8V

B.U.5V

AM: 170mV

FM: 400mV

L

PACK IN

(FF/REW)

AMP. MUTE

FF/REW

BU5V

ILL

(X13)

M

KRC-19A/19G/289

KRC-289

KRC-289

F/E

MOTOR SW

Q260,261

ACC. DET.

5V

KRC-19A/G,289

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BLOCK DIAGRAM

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KRC-19A/G,289

COMPONENT DESCRIPTION

Q

TEL [phone] QQ 376315150 892498299

SWITCH UNIT(X13-965X-XX)

Q

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

IC1 LC75853E LCD driver with key-matrix

Q

SYNTHESIZER UNIT(X14-6570-2X)

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 Power IC

IC5 LA3161 Equalizer amplifier Equalizer amplifier for cassette tape sound

Q50 2SC2412K or 2SD601A

Q51 2SB1443
Q52 2SC2412K or 2SD601A Inverted Darlington connection.
Q53 DTA114YK P.ON 5V SW While a base becomes Lo, Q53 is turned on.
Q54 DTC144EK or UN2213
Q55 DTA124EK or UN2112 Works during POWER ON mode.

Q56

Q57 2SC2412K or 2SD601A
Q58 DTC144EK or UN2213 Q59 is turned on while Q58's base becomes Hi.

Q59 DTA124EK or UN2112

Q60

TEL

Q61 2SC2412K or 2SD601A

Q150 DTC124EK or UN2212 ELECTRIC VOLUME MUTE SW RESET SW or MI-COM.'s mute works, a base

Q151 DTC114YK or UN2214 SVR DISCHARGE SW

Q153 DTA124EK or UN2112 PRE OUT MUTE DRIVER RESET SW or MI-COM.'s mute works, a base

Q200 DTC124EK or UN2212 FM +B SW Q201 is turned on when Q200's base becomes Hi.
Q201 2SB1277(Q,R) FM +B DRIVER Works during FM reception mode.
Q202 DTC124EK or UN2212 AM +B SW Q203 is turned on when Q202's base becomes Hi.
Q203 2SB1277(Q,R) AM +B DRIVER Works during AM reception mode.
Q260 DTC114YK or UN2214 MOTOR +B SW Q261 is turned on when Q260's base becomes Hi.
Q261 2SB1443 MOTOR +B DRIVER Works during TAPE mode.
Q301 DTA144EK or UN2213 CHANGER RESET SW When a base becomes Lo, Q301 is turned on.

Q320 2SA1037K PANEL 5V SW

Q350 2SB1277(Q,R) P-CON. DRIVER Q350 is turned on when Q353's base becomes Hi.
Q351 2SA1037K P-CON. PROTECTION SW

Q352 DTA124EK or UN2112

Q353 DTC114YK or UN2214 P-CON. SW

Q370 2SB1277(Q,R) ANT-CON. DRIVER Q370 is turned on when Q371's base becomes Hi.
Q371 DTC114YK or UN2214 ANT-CON. SW Works during TUNER mode.

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Q450 DTC143TK or UN2216 PRE OUT MUTE SW(R ch.) RESET SW or MI-COM.'s mute works,

Q451 DTC143TK or UN2216 PRE OUT MUTE SW(L ch.)

7

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2SB1548(P) or 2SB1565(E,F)

2SB1548(P) or 2SB1565(E,F)

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DTA114EK or UN2111 Key-matrix permission SW Ready on key-matrix

or 2SB1655(E,F) COM+B AVR

or 2SB1655(E,F) ILLUMINATION +B DRIVER

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BACK-UP detection (Momentary While BACK-UP is added, a base becomes Hi,
power down detection) SW and Q50 is turned on.

BACK-UP 5V AVR

COM+B SW

ILLUMINATION +B SW Works during POWER ON mode with a panel

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P-CON. PROTECTION Inhibits protection SW function when P-CON
INHIBIT SW works momentary.

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Amplifies power so that the speaker
can drive audio signal.

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

Q55 is turned on while Q54's base becomes Hi.

Q56 is turned on while Q57's base becomes Hi.
Inverted Darlington connection.

attached to the set.
Q60 is turned on while Q61's base becomes Hi.

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Inverted Darlington connection.

When BACK-UP detection SW or CHANGER

becomes Hi, and Q150 is turned on.
When POWER IC RESET is activated, a base
becomes Hi, Q151 is turned on.
When BACK-UP detection SW or CHANGER

becomes Lo, and Q153 is turned on.

While a panel is attached to the set,
a base becomes Lo, and Q320 is turned on.

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

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

When BACK-UP detection SW or CHANGER

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a base becomes Hi, and Q450,451 are turned on.

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MICROCOMPUTER'S TERMINAL DESCRIPTION

¶ Terminal Description IC1 : MI-COM. (X14-)

Q

Q

Pin No. Pin Name I/O Description Processing Operation

1 XIN I Main clock resonator connection terminal
2 GND - TEST terminal 2 Connected to GND lines.
3 L DATA L I Data input from the LCD driver IC
4 L DATA S O Data output to the LCD driver IC
5 L CLK O Clock output to the LCD driver IC
6 L CE O CE output to the LCD driver IC
7 SDA I/O Data input/output with the E-VOL. IC
8 PLL DATA I/O Data input/output with the F/E
9 PLL CLK O Clock output to the F/E

10 SD I SD input from the F/E Hi : Station detected

TEL [phone] QQ 376315150 892498299

11 DATA C I Data input from changers
12 DATA H O Data output to changers
13
14 O N.C.(Not used)
15 MOTOR O Cassette motor on/off output Hi : Motor ON
16 SCL O Clock output to the E-VOL. IC

17-24 O N.C.(Not used)

25 AM+B O AM+B ON/OFF output Hi : during AM reception
26 FM+B O FM+B ON/OFF output Hi : during FM reception
27
28
29 GND I Connected to GND lines.
30 GND I Connected to GND lines.
31 VDD - VDD connection terminal Connected to B.U. 5V lines.
32

TEL

33 MUTE O Audio mute on/off output Hi : Mute ON
34 CH CON O Changer control Lo : Standby, Hi : ON
35

36 SVR O Power IC reset terminal ACC ON/OFF is detected and after POWER

37 AMP STBY O Power IC standby control output Hi : POWER ON mode
38 AMP MUTE O Power IC mute control Lo : Mute
39 P CON O Power control Hi : POWER ON mode
40 ANT CON O Antenna control Hi : during FM/AM reception
41 SW5V O SW 5V control Lo : POWER ON mode
42 ILL O Illumination AVR ON/OFF control terminal Hi : POWER ON mode
43 O N.C.(Not used)
44 BEEP O BEEP sound output

45-47 O N.C.(Not used)

48 ROLL OFF I Roll off input Pull down to GND lines. (Not used)
49 NOISE CANCELLER I Noise canceller input Pull down to GND lines. (Not used)
50 SEL1 I Destination input 1 Lo : KDC-19A/G, Hi : KDC-289
51 SEL2 I Destination input 2 Pull down to GND lines. (Not used)
52 O N.C.(Not used)
53
54
55 O N.C.(Not used)

56 REMO

57-60 O N.C.(Not used)

61 ACC DET I ACC detection input Hi : ACC ON

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CH CLK

PACK IN

FF/REW

REQ C

REQ H

EQ MUTE
FWD/REV

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I/O Clock input/output with changers

I Cassette tape Pack-in detection input Lo : Pack-in
I FF/REW detection input Lo : FF/REW, Hi : PLAY

I Request input from changers Lo : Request

O Request output to changers Lo : Request

O Tape equaliser mute on/off output N.C.(Not used)

I FWD/REV detection input Lo : REV mode

I Data input from the remote control light Pull down to GND lines. (Not used)

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When the momentary power down, after

OFF, the output becomes Hi temporarily.

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KRC-19A/G,289

MICROCOMPUTER'S TERMINAL DESCRIPTION

¶ Terminal Description IC1 : MI-COM. (X14-)

Q

Q

Pin No. Pin Name I/O Description Processing Operation

62 B.U. DET I Momentary power down detection input

63 S METER I S-meter input from the F/E
64 PANEL I Panel detaching detection input Lo : Panel not detached
65 GND I Connected to GND lines.
66 GND I Connected to GND lines.
67 HOLD I MI-COM. HOLD input Lo : Hold
68 VDD - VDD connection terminal Connected to B.U. 5V lines.
69 GND I Connected to GND lines.

TEL [phone] QQ 376315150 892498299

70 GND I Connected to GND lines.

71,72 O N.C.(Not used)

73 VDD - VDD connection terminal Connected to B.U. 5V lines.
74 GND I Connected to GND lines.
75 GND I Connected to GND lines.
76 VSS - Ground connection terminal Connected to GND lines.

77,78 O N.C.(Not used)

79 GND - TEST terminal 1 Connected to GND lines.
80 XOUT O Main clock reson

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ator connection terminal

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Hi : When momentary power down detected
or B.U. OFF, Lo : B.U. ON

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1. How to enter the test mode

• Reset the unit while holding the "FM" key and preset "6" key.

• All indication segments go ON at the beginning of the test mode.

2. How to release the test mode

• Simply reset the unit.

• (NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary power down or the panel off.

3. Audio adjustment

• Set the volume level to -10dB (which is shown as "30" on the display).

• Loudness OFF.

• The BASS / TREBLE and BALANCE / FADER controls can be set to the full boost / full cut and full right / full left and full

• Sound coordination doesn't appear for the feed.

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TEST MODE

front / full rear respectively by pressing the "Track Up" / "Track Down" keys.

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KRC-19A/G,289

(2-LINE TAPE)

B

A

B

A

(FWD)

(RVS)

HEIGHT

(FWD)

HEIGHT/AZIMUTH

(FWD)

HEIGHT/AZIMUTH

(RVS)

TAPE SPEED

HEIGHT

(RVS)

F

''

F

R

R

ADJUSTMENT/EINSTELLUNGEN (MECHA.)

7

Head Angle Adjustment

Q

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Head height alignment procedure

• During FWD transport adjust screws F and F' so that line A of 2-LINE

• During RVS transport adjust screws R and R' so that line B of 2-LINE

• After the alignment above, reverse the transport direction and check the

TEL [phone] QQ 376315150 892498299

Einstellung des Kopfwinkels

Vorgehensweise bei der Kopfhöhen-Einstellung

• Während des Bandlaufs in Vorwärtsrichtung die Schrauben F und F' so

• Während des Bandlaufs in Rückwärtsrichtung die Schrauben R und R' so

TEL

• Nachdem die obige Einstellung abgschlossen ist, die Bandlaufrichtung

3

TAPE passes trough the center of the head shield plate (core center area)

TAPE passes trough the center of the head shield plate core (center area)

FWD alignment again. If it is deviated, perform alignment again. (Tape
used : SCC-1659, manufactured by A-BEX)

einstellen, daß die Linie A eines 2-Linien-Bands (2-LINE TAPE) durch die
Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs) verläuft.

einstellen, daß die Linie B eines 2-Linien-Bands (2-LINE TAPE) durch die
Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs) verläuft.

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umkehren und die Ausrichtung in Vorwärtsrichtung noch einmal
überprüfen. Wenn eine Abweichung festgestellt wird, ist diese Einstellung
zu wiederholen. (Verwendetes Band: SCC-1659, hergestellt von A-BEX)

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