Pioneer KEH-1940 X1M, KEH-1960, KEH-1960 X1W Service Manual

PIONEER CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936

C PIONEER CORPORATION 1999

K-ZZY. NOV. 1999 Printed in Japan

ORDER NO.

CRT2425

HIGH POWER CASSETTE PLAYER WITH FM/MW/LW TUNER

KEH-1940 X1M/EW

CONTENTS

1. SAFETY INFORMATION............................................2

2. EXPLODED VIEWS AND PARTS LIST ......................2

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ..10

4. PCB CONNECTION DIAGRAM................................20

5. ELECTRICAL PARTS LIST........................................28

6. ADJUSTMENT.........................................................32

7. GENERAL INFORMATION.......................................34

7.1 DISASSEMBLY ..................................................34

7.2 PARTS ................................................................35

7.2.1 IC...............................................................35

7.2.2 DISPLAY ...................................................38

8. OPERATIONS AND SPECIFICATIONS....................39

KEH-1960 X1M/EW

KEH-1940/X1M/EW

- This service manual should be used together with the following manual(s):

Model No. Order No. Mech. Module Remarks
CX-644 CRT1800 2M Cassette Mech. Module:Circuit Description, Mech.Description, Disassembly

2

KEH-1940,1960

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

1

4

3

5

9

16

15

6

10

8

7

13

11

12

2

14

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do so
and refer the repair to a qualified service technician.

3

KEH-1940,1960

NOTE:

- Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.

- Screws adjacent to

∇ mark on the product are used for disassembly.

- PACKING SECTION PARTS LIST

Part.No

Mark No. Description KEH-1940/X1M/EW KEH-1960/X1M/EW

1 Accessory Assy CEA1917 CEA1917
2 Screw CBA1304 CBA1304
3 Handle CNC5395 CNC5395
4 Bush CNV3930 CNV3930

* 5 Polyethylene Bag E36-615 E36-615

6 Polyethylene Bag CEG-162 CEG-162
7 Carton CHG3911 CHG3912
8 Contain Box CHL3911 CHG3912
9 Protector CHP1622 CHP1622

10 Protector CHP1623 CHP1623

11 Owner’s Manual CRD3094 CRD3094

12 Installation Manual CRD3096 CRD3096
* 13 Passport CRY1013 CRY1013
* 14 Warranty Card CRY1157 CRY1157

15 Case Assy CXB3520 CXB3520

16 Cord Assy CDE6212 CDE6212

- Owner's Manual

Model Part No. Language
KEH-1940/X1M/EW CRD3094 English, Spanish, German, French, Italian, Dutch
KEH-1960/X1M/EW

- Installation Manual

Model Part No. Language
KEH-1940/X1M/EW CRD3096 English, Spanish, German, French, Italian, Dutch
KEH-1960/X1M/EW

4

KEH-1940,1960

2.2 EXTERIOR

5

KEH-1940,1960

(1) EXTERIOR SECTION PARTS LIST

Mark No. Description Part No.

Mark No. Description Part No.

1 Screw BSZ26P050FMC
2 Screw BSZ30P055FUC
3 Screw BSZ30P060FMC
4 Screw BSZ30P100FMC
5 Cord Assy CDE6212

6 Cap CKX-003
7 Case CNB2481
8 Holder CNC5704
9 Insulator CNM5025

10 Cushion CNM5210

11 Tuner Amp Unit CWM6740

12 Screw BSZ26P080FMC

13 Screw BSZ26P140FMC

14 FM/AM Tuner Unit CWE1466

15 Holder CNC6554

16 Plug(CN603) CKM1270

17 Connector(CN601) CKS3362

18 Connector(CN602) CKS3581

19 Antenna Jack(CN301) CKX1056

20 Panel CNB2246

21 Holder CNC5399

22 Holder CNC6216

23 Heat Sink CNC6217

24 Holder CNC6845

25 Holder Unit CXB2687

26 Chassis Unit

See Contrast table(2)

27 Detach Grille Assy See Contrast table(2)

28 Screw BPZ20P120FZK

29 Button(EJECT)

See Contrast table(2)

30 Button(REW) See Contrast table(2)

31 Button(FF) See Contrast table(2)

32 Button(CROSS) See Contrast table(2)

33 Button(TUNER/BAND) See Contrast table(2)

34 Button(1-6) CAC6300

35 Button(DETACH)

See Contrast table(2)

36 Spring CBH1836
37 Spring CBH2307
38 Cover

See Contrast table(2)

39 Keyboard Unit See Contrast table(2)
40 LCD(LCD901) CAW1568

41 Connector(CN901) CKS3580
42 Holder CNC8525
43 Sheet CNM6486
44 Lighting Conductor CNV5969
45 Rubber CNV5970

46 Connector CNV5972
47 Grille Unit

See Contrast table(2)

48 Button CAC4836
49 Spring CBH1834
50 Spring CBH1835

51 Spring CBH2367
52 Bracket CNC6135
53 Bracket CNC6791
54 Arm CNV4692
55 Arm CNV4693

56 Arm CNV4728
57 Panel Unit

See Contrast table(2)

58 Door See Contrast table(2)
59 Spring CBH1838
60 Panel

See Contrast table(2)

61 Screw IMS20P030FZK
62 Fuse(10A) CEK1136
63

Cassette Mechanism Assy EXK3410

64 IC(IC501) TDA7384
65 Transistor(Q804) 2SD2395

6

KEH-1940,1960

(2) CONTRAST TABLE
KEH-1940/X1M/EW and KEH-1960/X1M/EW are constructed the same except for the following:

Part No.

Mark No. Description KEH-1940/X1M/EW KEH-1960/X1M/EW

26 Chassis Unit CXB4636 CXB4637
27 Detach Grille Assy CXB4671 CXB4672
29 Button(EJECT) CAC5870 CAC5871
30 Button(REW) CAC5872 CAC5873
31 Button(FF) CAC5874 CAC5875

32 Button(CROSS) CAC6295 CAC6296
33 Button(TUNER/BAND) CAC6297 CAC6298
35 Button(DETACH) CAC6301 CAC6302
38 Cover CNS5696 CNS5697
39 Keyboard Unit CWM6745 CWM6746

47 Grille Unit CXB4631 CXB4632
57 Panel Unit CXB4924 CXB4925
58 Door CAT2109 CAT2108
60 Panel CNS5211 CNS5212

7

KEH-1940,1960

8

KEH-1940,1960

2.3 CASSETTE MECHANISM ASSY

9

KEH-1940,1960

1 Screw BSZ23P050FMC
2 Washer CBG1003
3 Connector(CN1) CKS2829
4 Screw(M2x5) EBA1038
5 Screw(M2x2.5) EBA1037

6 Spring EBH1554
7 Spring EBH1555
8 Spring EBH1556
9 Spring EBH1603

10 Spring EBH1591

11 Spring EBH1559
12 Spring EBH1593
13 Spring EBH1561
14 Spring EBH1562
15 Spring EBH1563

16 Spring EBH1623
17 Spring EBH1565
18 Spring EBH1566
19 Spring EBH1567
20 Spring EBH1568

21 Spring EBH1569
22 Spring EBH1571
23 Spring EBH1579
24 Head Base ENC1475
25 Lever ENC1429

26 Lever ENC1430
27 Lever ENC1431
28 Lever ENC1432
29 Arm ENC1433
30 Arm ENC1434

31 Arm ENC1480
32 Arm ENC1493
33 Bracket ENC1477
34 Lever ENC1483
35 Arm ENC1524

36 Frame ENC1440
37 Holder ENC1441
38 Lever ENC1446
39 Lever ENC1478
40 Belt ENT1027

41 Gear ENV1504
42 Gear ENV1470
43 Gear ENV1471
44 Lever ENV1472
45 Gear ENV1510

46 Gear ENV1475
47 Gear ENV1512
48 Gear ENV1513
49 Gear ENV1502
50 Lever ENV1480

51 Lever ENV1487
52 •••••
53 Arm ENV1519

* 54 PCB ENP1161

55 •••••

56 Switch(FWD)(REV)(S3) ESH1006
57 Switch(Load)(S1) ESN1016
58 Switch(Mute)(S2) ESN1017
59 Head Assy(HD1) EXA1466
60 Motor Unit(M1) EXA1467

61 Flywheel Unit EXA1547
62 •••••
63 Arm Unit EXA1447
64 Arm Unit EXA1448
65 Arm Unit EXA1534

66 Reel Unit EXA1450
67 Pinch Holder ENV1466
68 Pinch Roller ENV1518
69 Pinch Holder ENV1467
70 •••••

71 Chassis Unit EXA1498
72 Arm ENV1524
73 Washer HBF-167

74-78 •••••

79 Cover ENC1452

80 Washer CBF1051
81 Spring EBH1592

Mark No. Description Part No. Mark No. Description Part No.

- CASSETTE MECHANISM ASSY SECTION PARTS LIST

KEY MATRIX

M

L

FWD

GND

HEAD

M

MOTOR

FWD
Lch

REV
Lch

FWD-L

REV-L

Q808

Q806

Q807

Q805

FM SWITCH

AM SWITCH

FM

AM

FIX+B

VCO

AMIF

EO

Q303

Q302

LOOP FILTER

3

13

6

54

51

X601

4.5MHz

25

24

EO

AMIF

VCOIN

FM

AM

XI

XO

SL

FMSD

14
12

SYSTEM CONTROLLER

IC 601 (1/2)

PE5107A

SL

FMSD

Q804

9V REGULATOR

FIX+B

Q803

Q802

B.U

SYSPW

ILL+B

ILL+B

IL901-903

FM

OSC

Q201

Q202

FMTV

AM

OSC

AMIFC

VCO

FM+B AM+B

TUN+B

FMSD

25
26

19

20 15

17

21

14

13 6

7

9

18

41 9

10 14

15

17 19

47 1

2

19

43

40

28

30

31

252318

16

36

3238

6

34

Q3

FM RF

T31

FM/AM MIX

Q31

CF51

FM/AM IF

CF52
FM IF

CF53
FM IF

T51

FMSL
AMSL

AMTV

AMRF/AGC

CF232 AM IF

FM/AM PROCESSOR

IC 1

PA4023B

FM PROCESSOR

IC 2

PA4024A

TUN-L

FIX+B

A

B

C

D

KEYBOAR

FM/AM TUNER UNIT

TUNER AMP UNIT

CN301

ANT

Q304

LW

LW

57

LW

CA

10

KEH-1940,1960

A

1

234

B

C

D

12

34

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

11

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

IC 501

TDA7384

FL+
FL-

RL+
RL-

MUTE

STBY

FL
RL

POWER AMP

9
7

17
19

FL+
FL-

RL+
RL-

6
5

8
9

7

2

1

22

4

SYSPW

Q501

Q609

Q502

Q607

MUTE

Q608

DMINH

Q606

FUSE
10A

B.U

B.U

ACC

CE

VDD1
VDD2

VDD

Q603

Q604

Q605

Q801

IC 801

TPD1018F

B REMOTE

BRE

CN603

1

SYSPW

6

5

B.U

SYSPW

SYSPW

437

4039

CE

DMINH

MUTE

11

15

19

20

IC 401

SN761029DL

ELECTRONIC

VOLUME

VDT/VCK/VST

2
3

3

IC 201

LA3161P

CASSETTE

EQUALIZER

1

B.U

FIX+B

4

MUTE

Q601

63

TAPLD

1

2

NOR/REV

MCMUT

LOAD

B.U

MECPW

50

Q809

Q810

MECPW

MECHA

POWER SWITCH

MECHA MUTE

Q602

SWVDD

18

VDD

SWVDD

9

10

LCK
LDT

4
3

5

6

CN602

ILL+B
SW5V

SCK
SIO

4
3

5

6

IC 901

PDC045A

KEY/LCD
DRIVER

RES
SCK

SO

SI

VDD

24

17
15

14

13

LCD 901

CAW1568

CN901

SYSTEM CONTROLLER

IC 601 (2/2)

PE5107A

MUTE SWITCH

LOAD SWITCH

FWD/REV

FWD/REV SWITCH

GND

1

10

6

8

4

9

1

10

6

8

4

9

CN601

ILL+B

TUN-L

B REMOTE

BRE

ACC

BATTERY

FL+

FL-

RL+

RL-

CASSETTE PCB

12

KEH-1940,1960

A

1

234

B

C

D

12

34

A-a A-b

A-a

A-b

A-b

A-a

Large size

SCH diagram

Guide page

Detailed page

SYSTEM CONTROLLER

EQ AMP

ELECTRONIC VO

TUNER AMP UNIT

A

FM/AM TUNER UNIT

B

CASSETTE PCB

D

-73dBs

-

AM : -26.0dBs

FM : -16.0dBs

A

D

3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)

Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS

LIST”.

A-a

600µH

CEL 1547
(1940/X1M/EW)
CEL 1479
(1960/X1M/EW)

14V 40mA

FUSE

POWER AMP

B.REMOTE

KEYBOARD UNIT

C

GND

RL

+

RR

+

FR

+

FL

+RL-

FL

-

FR

-

RR

-

ANT

UP

BACK

ACC

-29.0dBs

AM : -0.9dBs

FM : 9.1dBs

TAPE : -3.9dBs

TAPE : 22.1dBs

FM : 100% 35.1dBs
AM : 30% 24.1dBs
TAPE : 315Hz 0dB 22.1dBs

KEY/LCD DRIVER

13

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

A

A-b

C

14

KEH-1940,1960

A

1

234

B

C

D

12

34

ELECTRONIC VOLUME

TUNER AMP UNIT

A

FM/AM TUNER UNIT

B

-29.0dBs

AM : -26.0dBs

FM : -16.0dBs

A-a

A-a

A-b

1

2

15

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

SYSTEM CONTROLLER

EQ AMP

CASSETTE PCB

D

-73dBs

A-a

A-a

A-b

D

3

5

4

16

KEH-1940,1960

A

1

234

B

C

D

12

34

600µH

FUSE

POWER AMP

GND

RL

+

RR+FR+FL

+

RL-FL-FR-RR

-

ANT

UP

BACK

ACC

AM : -0.9dBs

FM : 9.1dBs

TAPE : -3.9dBs

TAPE : 22.1dBs

FM : 100% 35.1dBs

AM : 30% 24.1dBs

TAPE : 315Hz 0dB 22.1dBs

A-a

A-b

A-b

1

2

17

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

CEL 1547

(1940/X1M/EW)

CEL 1479

(1960/X1M/EW)

14V 40mA

B.REMOTE

KEYBOARD UNIT

C

KEY/LCD DRIVER

A-b

A-a

A-b

C

3

5

4

18

KEH-1940,1960

A

1

234

B

C

D

12

34

3.3 FM/AM TUNER UNIT

B

3

1

2

FM/AM TUNER UN

DSP-201M-A11F

B

19

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

B

R UNIT

A

4. PCB CONNECTION DIAGRAM

4.1 TUNER AMP UNIT

20

KEH-1940,1960

A

1

234

B

C

D

12

34

A

CORD ASSY

TUNER AMP UNIT

NOTE FOR PCB DIAGRAMS

1. The parts mounted on this PCB
include all necessary parts for
several destination.
For further information for
respective destinations, be sure
to check with the schematic
diagram.

2. Viewpoint of PCB diagrams

Capacitor

Connector

P.C.Board

Chip Part

SIDE A

SIDE B

A

21

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

A

D

B

C

CN1

CN901

SIDE A

22

KEH-1940,1960

A

1

234

B

C

D

12

34

A

A

TUNER AMP UNIT

23

KEH-1940,1960

5

6

7

8

A

B

C

D

5

6

7

8

A

SIDE B

24

KEH-1940,1960

A

1

234

B

C

D

12

34

4.2 FM/AM TUNER UNIT

B

SIDE A

FM/AM TUNER UNIT

A

B

25

KEH-1940,1960

1

2

3

4

A

B

C

D

1

2

3

4

B

SIDE B

FM/AM TUNER UNIT

B

KEH-1940,1960

A

1

234

B

C

D

12

34

A

CN602

TUNER

BAND

1

2

3

4

5

6

S

CLOCK BSM LOCAL

4.3 KEYBOARD UNIT

C

C

KEYBOARD UNIT

26

SIDE B

SIDE A

KEYBOARD UNIT

C

1

3

5

7

9

2

4

6

810

CN1

S3

FWD/REV SW

S2

MUTE SW

S1

LOAD SW

M

M1

MOTOR

RR

FR

FL

RL

FWD/REV
PB HEAD

HD1

A

CN601

27

KEH-1940,1960

1

2

3

4

A

B

C

D

1

2

3

4

D

D

CASSETTE PCB

4.4 CASSETTE PCB

D 617 Diode 1SS270
D 801 Diode 1SR139-400
D 802 Diode 1SR139-400
D 803 Diode 1SR139-400
D 804 Diode 1SR139-400

D 805 Diode 1SR139-400
D 806 Diode HZS6L(B2)
D 807 Diode HZS9L(B3)
L 601 Ferri-Inductor LAU2R2K
L 602 Ferri-Inductor LAU2R2K

L 801 Choke Coil 600µH CTH1168
X 601 Crystal Resonator 4.500MHz CSS1077

FM/AM Tuner Unit CWE1466

RESISTORS

R 201 RS1/10S104J
R 202 RS1/10S104J
R 203 RS1/10S472J
R 204 RS1/10S472J
R 205 RS1/10S470J

R 206 RS1/10S470J
R 207 RS1/10S273J
R 208 RS1/10S273J
R 301 RS1/10S102J
R 302 RS1/10S222J

R 303 RS1/10S222J
R 304 RD1/4PU102J
R 305 RS1/10S102J
R 313 RS1/8S223J
R 314 RD1/4PU103J

R 315 RS1/10S102J
R 316 RS1/10S472J
R 317 RS1/10S152J
R 318 RD1/4PU222J
R 319 RS1/10S222J

R 320 RS1/10S102J
R 321 RD1/4PU103J
R 322 RS1/10S393J
R 323 RS1/10S0R0J
R 324 RS1/10S0R0J

R 325 RD1/4PU101J
R 331 RS1/8S0R0J
R 401 RS1/10S272J
R 402 RS1/10S272J
R 403 RS1/10S0R0J

R 405 RS1/10S272J
R 406 RS1/10S272J
R 407 RS1/10S151J
R 408 RS1/10S151J
R 501 RS1/10S153J

R 502 RS1/10S221J
R 503 RS1/10S101J
R 504 RD1/4PU153J
R 601 RD1/4PU102J
R 602 RS1/10S473J

28

KEH-1940,1960

5. ELECTRICAL PARTS LIST

NOTE:

- Parts whose parts numbers are omitted are subject to being not supplied.

- The part numbers shown below indicate chip components.

Chip Resistor

RS1/_S___J,RS1/__S___J

Chip Capacitor (except for CQS.....)

CKS....., CCS....., CSZS.....

Unit Number : CWM6740
Unit Name : Tuner Amp Unit

MISCELLANEOUS

IC 201 IC LA3161P
IC 401 IC SN761029DL
IC 501 IC TDA7384
IC 601 IC PE5107A
IC 801 IC TPD1018F

Q 301 Transistor 2SC1740S
Q 302 Transistor 2SC1740S
Q 303 Transistor 2SK330
Q 304 Transistor DTC124ES
Q 501 Transistor DTC124ES

Q 502 Transistor DTC124ES
Q 601 Transistor DTC114ES
Q 602 Transistor 2SA933S
Q 603 Transistor DTA114ES
Q 604 Transistor 2SC1740S

Q 605 Transistor 2SC1740S
Q 606 Transistor 2SC1740S
Q 607 Transistor 2SC1740S
Q 608 Transistor DTC124TS
Q 609 Transistor DTC143TS

Q 801 Transistor 2SD1859
Q 802 Transistor 2SB1238
Q 803 Transistor DTC124ES
Q 804 Transistor 2SD2395
Q 805 Transistor 2SA933S

Q 806 Transistor 2SA933S
Q 807 Transistor DTC114ES
Q 808 Transistor DTC114ES
Q 809 Transistor DTC143TS
Q 810 Transistor 2SB1242

D 201 Diode 1SS270
D 301 Diode MTZJ3R0(B)
D 302 Diode 1SS270
D 303 Diode 1SS270
D 601 Diode 1SS270

D 602 Diode 1SS270
D 603 Diode 1SS270
D 604 Diode 1SS270
D 605 Diode HZS7L(A1)
D 606 Diode 1SS270

D 607 Diode 1SS270
D 608 Diode 1SS270
D 609 Diode HZS7L(A1)
D 610 Diode HZS7L(C3)
D 611 Diode HZS7L(B1)

D 612 Diode 1SS270
D 613 Diode 1SS270
D 614 Diode 1SS270
D 615 Diode HZS9L(A2)
D 616 Diode 1SS270

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

A

R 603 RS1/10S103J
R 604 RD1/4PU332J
R 605 RS1/10S473J
R 606 RS1/10S222J
R 607 RS1/10S222J

R 608 RD1/4PU473J
R 609 RS1/10S123J
R 612 RD1/4PU472J
R 613 RD1/4PU473J
R 614 RS1/10S473J

R 615 RS1/10S222J
R 616 RD1/4PU222J
R 617 RD1/4PU222J
R 618 RS1/10S1R0J
R 621 RD1/4PU222J

R 622 RS1/10S473J
R 623 RS1/10S472J
R 624 RS1/10S223J
R 625 RS1/10S103J
R 626 RS1/10S223J

R 627 RS1/10S103J
R 628 RS1/10S104J
R 629 RS1/10S223J
R 630 RS1/10S103J
R 631 RD1/4PU472J

R 632 RS1/10S472J
R 633 RS1/10S103J
R 634 RS1/10S223J
R 635 RD1/4PU152J
R 636 RD1/4PU103J

R 637 RD1/4PU472J
R 640 RS1/10S472J
R 801 RD1/4PU102J
R 803 RS1/10S103J
R 804 RS1/10S223J

R 805 RD1/4PU331J
R 806 RD1/4PU331J
R 807 RD1/4PU511J
R 808 RS1/10S472J
R 809 RS1/10S102J

R 810 RS1/10S472J
R 811 RS1/10S102J
R 812 RS1/10S472J
R 813 RD1/4PU102J
R 814 RD1/4PU1R5J

R 815 RD1/4PU1R5J
R 816 RD1/4PU103J

CAPACITORS

C 201 CEJA2R2M50
C 202 CEJA2R2M50
C 203 CKSQYB333K25
C 204 CKSQYB333K25
C 205 CEJA101M10

C 206 CEJA101M10
C 207 CKSQYB681K50
C 208 CKSQYB681K50
C 209 CEJA101M10
C 301 CKSQYB473K25

C 302 CKSQYB104K16
C 303 CKSQYB223K50
C 304 CKSQYB104K16
C 305 CKSQYB223K50
C 306 CKSQYB102K50

C 307 CKSQYB103K50
C 308 CCSQCH101J50
C 311 CCSQCH101J50
C 313 CKLSR473K16
C 314 CKSQYB102K50

C 315 4.7µF/16V CCH1250
C 316 CKSQYB103K50
C 317 CEJAR47M50
C 318 CKSQYB223K50
C 319 CKSQYB223K50

C 401 CKSQYB223K50
C 402 CKSQYB223K50
C 403 CEJA1R0M50
C 404 CEJA1R0M50
C 405 CEJA1R0M50

C 406 CEJA1R0M50
C 407 CEJA100M16
C 408 CEJA100M16
C 409 CKSQYB822K50
C 410 CKSQYB822K50

C 411 CEJA1R0M50
C 412 CEJA1R0M50
C 413 CKSQYB153K50
C 414 CKSQYB153K50
C 415 CKSQYB104K16

C 416 CKSQYB104K16
C 417 CKSQYB104K16
C 418 CKSQYB104K16
C 419 CKSQYB104K16
C 420 CEJA470M10

C 421 CEJA2R2M50
C 422 CEJA4R7M35
C 423 CKSQYB473K25
C 424 CEJA1R0M50
C 427 CCSQCH240J50

C 428 CCSQCH330J50
C 501 CFTNA224J50
C 502 CFTNA224J50
C 503 CFTNA224J50
C 504 CFTNA224J50

C 505 CEJA330M10
C 506 CEJA2R2M50
C 507 CFTNA105J50
C 508 CEJA100M16
C 510 CKSQYB104K50

C 601 CKSQYB104K16
C 602 CKSQYB102K50
C 603 CEJA4R7M35
C 604 CKSQYB224K16
C 605 CKSQYB102K50

C 606 CCSQCH100D50
C 607 CCSQCH110J50
C 608 CKSQYB103K50
C 611 CKSQYB472K50
C 801 3300µF/16V CCH1369

C 802 CKSQYB103K50
C 803 CKSYB103K50
C 804 CEAS331M16
C 805 CKSQYB102K50
C 806 330µF/10V CCH1181

C 807 CKSQYB103K50
C 808 330µF/10V CCH1181
C 809 CCSQCH101J50
C 810 CCSQCH101J50

Unit Number : CWE1466
Unit Name : FM/AM Tuner Unit

MISCELLANEOUS

IC 1 IC PA4023B
IC 2 IC PA4024A
Q 1 Transistor 2SC2412K
Q 2 Transistor DTC124EU
Q 3 FET 3SK263

29

KEH-1940,1960

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

B

Q 31 Transistor 2SC2412K
Q 154 Transistor DTC124EU
Q 165 Transistor 2SC2412K
Q 201 FET 2SK932
Q 202 Transistor 2SC2412K

Q 203 Transistor DTC124EU
D 4 Diode 1SV250
D 5 Diode KV1410-F1
D 7 Diode KV1410-F1
D 8 Diode KV1410-F1

D 201 Diode MA157
D 202 Diode MA157
D 231 Diode SVC253
L 2 Coil CTC1133
L 3 Inductor LCTB2R2K2125

L 4 Coil CTC1133
L 5 Coil CTC1132
L 6 Inductor LCTBR15K1608
L 51 Ferri-Inductor LAU150K
L 201 Ferri-Inductor LAU4R7K

L 202 Ferri-Inductor LAU330K
L 203 Inductor CTF1287
L 208 Inductor LAU121K
L 231 Inductor LCTA3R3J3225
T 31 Coil CTE1116

T 51 Coil CTC1136
TC 1 CCL1038
CF 51 Ceramic Filter CTF1442
CF 52 Ceramic Filter CTF1442
CF 53 Ceramic Filter CTF1442

CF 232 Ceramic Filter CTF1348
X 151 Radiator 918.5Hz CSS1365
X 231 Crystal Resonator 10.26MHz CSS1111
VR 154 Semi-fixed 150kΩ(B) CCP1213
AR 1 DSP-201M-A11F

RESISTORS

R 1 RS1/16S0R0J
R 4 RS1/16S154J
R 5 RS1/16S391J
R 6 RS1/16S223J
R 7 RS1/16S123J

R 8 RS1/16S332J
R 9 RS1/16S473J
R 10 RS1/16S223J
R 11 RS1/16S124J
R 13 RS1/16S563J

R 15 RS1/16S271J
R 16 RS1/16S104J
R 17 RS1/16S332J
R 18 RS1/16S332J
R 31 RS1/16S470J

R 32 RS1/16S822J
R 33 RS1/16S822J
R 34 RS1/16S331J
R 35 RS1/16S331J
R 40 RS1/16S470J

R 51 RS1/16S271J
R 52 RS1/16S560J
R 55 RS1/16S102J
R 56 RS1/16S823J
R 61 RS1/16S392J

R 62 RS1/16S393J
R 101 RS1/16S272J
R 102 RS1/16S682J
R 103 RS1/16S333J
R 104 RS1/16S334J

R 105 RS1/16S683J
R 107 RS1/16S222J
R 151 RS1/16S222J
R 152 RS1/16S393J
R 154 RS1/16S104J

R 155 RS1/16S273J
R 156 RS1/16S243J
R 157 RS1/16S203J
R 160 RS1/16S222J
R 161 RS1/16S563J

R 162 RS1/16S105J
R 163 RS1/16S222J
R 202 RS1/16S223J
R 203 RS1/16S225J
R 204 RS1/16S103J

R 206 RS1/16S220J
R 207 RS1/16S101J
R 208 RS1/16S102J
R 209 RS1/16S471J
R 214 RS1/16S822J

R 215 RS1/16S822J
R 217 RS1/16S102J
R 231 RS1/16S272J
R 232 RS1/16S473J
R 237 RS1/16S103J

R 238 RS1/16S104J
R 239 RS1/16S104J
R 240 RS1/16S332J
R 241 RS1/16S202J
R 243 RS1/16S123J

R 244 RS1/16S103J
R 247 RS1/16S123J

CAPACITORS

C 1 CCSQCH6R0D50
C 2 CCSRCK2R0C50
C 4 CCSRCH820J50
C 6 CCSRCH820J50
C 8 CKSRYB103K25

C 9 CKSQYB104K16
C 10 CCSRCKR50C50
C 11 CEJA1R0M50
C 13 CKSRYB222K50
C 14 CCSRCH220J50

C 16 CCSRCH8R0D50
C 17 CKSRYB222K50
C 18 CKSRYB103K25
C 19 CKSRYB222K50
C 20 CKSRYB222K50

C 21 CEJA100M16
C 22 CCSRTH9R0D50
C 23 CCSRTH120J50
C 24 CCSRCH471J50
C 25 CKSRYB103K25

C 31 CKSRYB103K25
C 32 CKSQYB472K50
C 33 CCSRCH5R0C50
C 34 CKSQYB104K16
C 36 CCSRRH201J50

C 51 CKSRYB223K25
C 52 CKSRYB103K25
C 54 CCSRCH470J50
C 55 CKSQYB223K25
C 56 CKSQYB104K16

C 57 CKSRYB472K50
C 58 CEJA330M10
C 59 CKSRYB103K25
C 61 CCSRCH270J50
C 62 CKSRYB103K25

30

KEH-1940,1960

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

31

KEH-1940,1960

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

=====Circuit Symbol and No.===Part Name Part No.

--- ------ ------------------------------------------ -------------------------

C 63 CEJAR15M50
C 101 CEJANP100M10
C 102 CKSRYB182K50
C 103 CKSRYB682K25
C 104 CEJA2R2M50

C 105 CKSRYB103K25
C 106 CCSRCH151J50
C 107 CKSRYB103K25
C 151 CKSRYB472K50
C 152 CKSQYB104K16

C 153 CEJA3R3M50
C 154 CKSQYB104K16
C 157 CEJA3R3M50
C 158 CKSYB474K16
C 159 CEJA220M6R3

C 160 CKSQYB104K16
C 161 CKSQYB104K16
C 162 CEJA3R3M50
C 163 CKSRYB102K50
C 170 CCSRCH100D50

C 201 CCSRCH471J50
C 202 CCSRCH100D50
C 203 CKSRYB332K50
C 204 CKSQYB473K16
C 205 CKSQYB473K16

C 206 CKSQYB104K16
C 207 CCSRCH560J50
C 209 CKSQYB104K16
C 211 CCSRCH101J50
C 212 CEJA470M6R3

C 213 CKSRYB103K25
C 216 CCSRCH101J50
C 217 CEJA1R5M50
C 219 CCSRCH471J50
C 220 CKSRYB103K25

C 230 CKSRYB103K25
C 231 CCSRCH330J50
C 232 CCSRCH150J50
C 233 CKSQYB104K16
C 234 CEJA330M10

C 235 CKSRYB332K50
C 236 CKSQYB473K16
C 237 CCSRCH120J50
C 239 CKSRYB472K50
C 240 CEJAR47M50

C 241 CKSQYB104K16
C 242 CEJAR47M50
C 243 CEJAR33M50
C 244 CKSQYB473K16
C 245 CKSRYB123K25

C 246 CKSQYB473K16
C 250 CCSRCH471J50

Unit Number : CWM6745

(KEH-1940/X1M/EW)

: CWM6746

(KEH-1960/X1M/EW)

Unit Name : Keyboard Unit

MISCELLANEOUS

IC 901 IC PDC045A
D 901 Diode MA153
D 902 Diode MA153
D 903 Diode MA110
IL 901 Lamp 14V 40mA (1940/X1M/EW) CEL1547

IL 901 Lamp 14V 40mA (1960/X1M/EW) CEL1479
IL 902 Lamp 14V 40mA (1940/X1M/EW) CEL1547
IL 902 Lamp 14V 40mA (1960/X1M/EW) CEL1479
IL 903 Lamp 14V 40mA (1940/X1M/EW) CEL1547
IL 903 Lamp 14V 40mA (1960/X1M/EW) CEL1479

LCD 901 LCD CAW1568

RESISTORS

R 901 RS1/10S222J
R 902 RS1/10S222J
R 905 RS1/10S682J
R 906 RS1/10S473J
R 907 RS1/10S472J

CAPACITORS

C 901 CCSQCH181J50
C 902 CKSQYB103K50
C 903 CKSQYB103K50
C 905 CKSQYB104K16
C 906 10µF/16V CCH1370

Unit Number :
Unit Name : Cassette PCB

S 1 Swicth(Load) ESN1016
S 2 Swicth(Mute) ESN1017
S 3 Swicth(FWD/REV) ESH1006

Miscellaneous Parts List

M 1 Motor Unit EXA1467
HD 1 Head Assy EXA1466

C

D

FM/AM TUNER UNIT

4Ω

4Ω

Lch +

Lch -

Rch +

Rch -

BACK UP

ACC

GND

+14.4V

GND

Antenna Jack

mV Meter (1)

Oscilloscope

DC Regulated
Power Supply

TUNER AMP UNIT

50Ω (75Ω )

FM SSG

Stereo
Modulator

50Ω (37.5Ω )

Antenna Plug

Dummy Antenna

FM/AM TUNER UNIT (TOP VIEW)

T31

T51

C63

T51

Center
Meter

FM/AM TUNER UNIT (BOTTOM VIEW)

Pin1

Pin13

Pin14

Pin 19

Pin26

L2

L4

L5

VR154

TC1

DC V
Meter(1)

32

KEH-1940,1960

6. ADJUSTMENT

- Connection Diagram

33

KEH-1940,1960

FM ADJUSTMENT

Modulation M:MONO MOD., 400Hz 30%(22.5kHz Dev.) or 400Hz 100%(75kHz Dev.)

S:STEREO MOD., 1kHz, L or R=30%(20.25kHz+7.5kHz Dev.)

NOTE:Before proceeding to further adjustments after switching power ON, let the tuner run for ten minutes to allow

the circuits to stabilize.

FM SSG Displayed Adjustment Adjustment Method

No. Frequency(MHz) Level(dBf) Frequency(MHz) Point (Switch Position)

TUN Volt 1 ••••• ••••• 108.0 L5 DC V Meter(1) : 6V

IF 2 98.1 M 60—100 98.1 T51 Center Meter : 0

ANT Coil 3 98.1 M 5 98.1 L2 mV Meter(1) : Maximum
RF Coil 4 98.1 M 5 98.1 L4 mV Meter(1) : Maximum

RF 5 129.3 M 60—80 107.9 TC1 mV Meter(1) : Minimum
Trimmer

6 RF Coil and RF Trimmer shall be adjusted twice or more

IFT 7 98.1 M 5 98.1 T31 mV Meter(1) : Maximum

(STEREO MODE)

ARC 8 98.1 S 40 98.1 VR154 mV Meter(1) : Separation 5dB

(STEREO MODE)

34

KEH-1940,1960

7. GENERAL INFORMATION

7.1 DISASSEMBLY

- Remove the Tuner Amp Unit(Fig.2)

Remove the two screws.

Remove the three screws.

Remove the screw.

Unbend the tabs at four locations indicated
by arrow until straight.
Remove the Tuner Amp Unit.

-

Remove the Case(not shown)

1.Remove the three screws.

2.Remove the Case.

- Remove the Cassette Mechanism Assy

(not shown)

1.Remove the four screws.

2.Disconnect the connector, and then remove the
Cassette Mechanism Assy.

- Remove the Panel Unit(Fig.1)

Disengage the stopper at two locations
indicated by arrow.

Remove the Panel Unit.

Fig.1

Fig.2

Panel Unit

Tuner Amp Unit

Cassette Mechanism Assy

35

KEH-1940,1960

7.2 PARTS

7.2.1 IC

SN761029DL

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

VCCAVcc

IN1-RIN1-L

IN2-RIN2-L

IN3-RIN3-L

IN4(+)-RIN4(+)-L

IN4(-)-RIN4(-)-L

AGNDAGND

SWout-RSWout-L

ZCin-RZCin-L

LOUD-RLOUD-L

VRin-RVRin-L

TREB-RTREB-L

BASS-C1-RBASS-C1-L

BASS-R-RBASS-R-L

BASS-C2-RBASS-C2-L

NCNC

TONEout-RTONEout-L

FADERin-RFADERin-L

FRNTout-RFRNTout-L

REARout-RREARout-L

DVccVREFin

DATAAGND

CLKDGND

STBCt

3 Line Serial Bus

Bass

Treble

Volume,

Loudness

Fader

Gain

Adjust

Isolator

Zero-cross

Detector

Power

Supply

Bass

Treble

Volume,

Loudness

Fader

Gain

Adjust

Isolator

Power

Supply

A

A

36

KEH-1940,1960

- Pin Functions (PE5107A)

Pin No. Pin Name I/O Format Function and Operation

1 mcmute I Cassette mechanism mute input

2 tapld I Tape loading input
3 EO O C Error output
4 VDD1 Power supply
5 GND GND
6 VCOIN I AM/FM VCO input
7 CE I ACC power sense input
8 VDD2 Power supply

9 LCK I/O C Serial clock input and output for LCD driver
10 LDT O C Data output for LCD driver
11 LDI I Key/LCD driver data input
12 FMSD I FM SD input
13 AMIF I AM IF signal input
14 SL I Signal level input
15 st I FM stereo input
16 sk Not used
17 DK Not used
18 swvdd O C Grille power supply control output
19 NC Not used
20 VST O C Strobe pulse output for electronic volume
21 VCK O C Clock output for electronic volume
22 VDT O C Data output for electronic volume
23 NC Not used
24 XO O Crystal oscillator connection pin
25 XI I Crystal oscillator connection pin
26 GND GND

27–30 NC Not used

31 TEST I Test program mode input
32 dsens I Grille detach sense input

33,34 GND GND

35–38 NC Not used

39 mute O C System mute output
40 DMINH O C Mechanism mute cancel output

41,42 NC Not used

43 SYSPW O C System power supply control output

44–48 NC Not used

49 MS Not used
50 MECPW O C Cassette mechanism power output
51 AM O C AM power control output
52 LOCL O C LOC “L“ output
53 LOCH O C LOC “H” output
54 FM O C FM power control output
55 seek O C Seek output
56 NC Not used
57 LW O C LW output
58 GND GND
59 DM3 Not used
60 DM2 Not used
61 DM1 I Model,function input
62 DM0 I Model,function input
63 nor/REV I Tape running input
64 GND GND

37

KEH-1940,1960

- Pin Functions(PDC045A)

Pin No. Pin Name I/O Function and Operation

1–4 NC Not used
5–8 KS4-1 O Key strobe output

9–12 KD4-1 I Key data input

13 SI I Display data input
14 SO O Key data output
15 SCK I/O Clock input terminal for serial data input and output
16 REMIN I Remote control reception
17 RES I Reset input
18 TEST I Test input
19 OSC-IN I System clock input
20 OSC-OUT O System clock output
21 GND GND

22,23 VDD2,1 LCD power supply

24 VDD Power supply
25–28 COM1-4 O LCD common signal
29–42 SEG1-14 O LCD segment signal
43–48 NC Not used

12

13

24

25

36

37

48

1

*PDC045A

IC's marked by* are MOS type.
Be careful in handling them because they are very
liable to be damaged by electrostatic induction.

Format Meaning
C C MOS

*PE5107A

51

52

64

33

20

32

1

19

38

KEH-1940,1960

7.2.2 DISPLAY

- CAW1568

SEGMENT

COMMON

39

KEH-1940,1960

8. OPERATIONS AND SPECIFICATIONS

1.This Product

2.Antenna jack

3.Connect leads of the same

color to each other.

5.Cap

6.Yellow

T

regardless of ignition switch position.

o terminal always supplied with power

7.Yellow

Back-up (or Accessory)

8.Red

To electric terminal controlled by ignition

switch (12 V DC) ON/OFF.

9.Red

Accessory (or Back-up)

5

67

89

Note:4.Note:

Depending on the kind of vehicle, the

function of 7 and 9 may be different.

If this is the case, be sure to connect

6to9and7to8.

When the power cord of the other

product is connected to terminal 5,

check the function of the terminal 5

(Back up or Accessory) beforehand.

4.

11.ISO connector

Note:

In some vehicles, the ISO connector may be

divided into two. If this is the case, be sure to

connect to both connectors.

12.Speaker leads

White: Front left +

White/black: Front left ≠

Gray: Front right +

Gray/black: Front right ≠

Green: Rear left +

Green/black: Rear left ≠

Violet: Rear right +

Violet/black: Rear right ≠

13.Blue/white

To Auto-antenna relay control terminal.

(Max. 300 mA 12 V DC.)

10.Black (ground)

To vehicle (metal) body.

15.Fuse

14.

Blue/white

The pin position of the ISO connector

will differ according to the type of

vehicle. Connect 13 and 14 when Pin 5 is

an antenna control type. In another type

of vehicle, never connect 13 and 14.

40

KEH-1940,1960

8.1 OPERATIONS

Key Finder

Head Unit

CLOCK

button

Detach buttonCassette door EJECT button

SHIFT/LOUD

button

BAND button

22/33 buttons

2/3 buttons

BSM button

TUNER button

LOCAL button

+/– buttons

Buttons 1–6

Basic Operation

To Listen to Music

The following explains the initial operations required before you can listen to music.

Note:

• Loading a cassette in this product.

1. Press the TUNER button to switch the Tuner ON/OFF.

Note:

• You cannot switch to the Tuner when a tape is loaded.

• You cannot switch to the Cassette Player when a tape is not loaded.

• When this product’s blue/white lead is connected to the car’s Auto-antenna relay control terminal,

the car’s Auto-antenna extends when this product’s power is switched ON. To retract the antenna,

switch the power OFF.

2. Raise or lower the volume.

3. Turn the Tuner OFF.

41

KEH-1940,1960

Basic Operation of Tuner

Basic Operation

Manual and Seek Tuning

• Press 2 or 3 to select a station.

Note:

• You can select the tuning method by pressing the 2 and 3 buttons at the

same time.

• When the Seek Tuning is selected, “SEEK” lights in the display.

• When the Manual Tuning is selected, “SEEK” goes out from the display.

• Stereo indicator “” lights when a stereo station is selected.

Preset Tuning

• You can memorize broadcast stations in buttons

1 through 6 for easy, one-touch station recall.

Preset station recall 2 seconds or less

Broadcast station preset memory 2 seconds or more

Note:

• Up to 18 FM stations (6 in FI (FM1), FII (FM2) and FIII

(FM3)) and 6 MW/LW stations (6 in M/L) can be stored in

memory.

Preset Number Indicator

Band

FI (FM1) = FII (FM2) = FIII (FM3)

= M/L (MW/LW)

Band Indicator

Frequency Indicator

Basic Operation of Cassette Player

Direction Change

• To change the

direction, press

the 1 and ¡

buttons at the

same time.

Eject

The power of this product turns OFF

when you eject a tape with the EJECT

button.

When you listen to the Tuner before a

tape is set to this product, the source

switches to the radio.

Fast Forward/Rewind

• To select Fast Forward, press the button for the same direction as

the tape play indicator.

• To select Rewind, press the button for the opposite direction as the

tape play indicator.

Note:

• To release Fast Forward/Rewind, lightly press the 1 or ¡ button located on the

opposite side of the one you pressed to Fast Forward or Rewind.

Cassette Loading Slot

You can listen to a tape if it is

set to this product even when

listening to the Tuner.

Tape Play Indicator

KEH-1940,1960

8.2 SPECIFICATIONS

Specifications

General

Power source .......... 14.4 V DC (10.8 – 15.1 V allowable)

Grounding system ........................................ Negative type

Max. current consumption ........................................ 8.5 A

Dimensions

(mounting size) ...... 178 (W) × 50 (H) × 150 (D) mm

(front face) .............. 188 (W) × 58 (H) × 20 (D) mm

Weight ...................................................................... 1.2 kg

Amplifier

Maximum power output ...................................... 40 W × 4

Continuous power output .................................... 22 W × 4

(DIN45324, +B = 14.4 V)

Load impedance .......................... 4 Ω (4 – 8 Ω allowable)

Tone controls

(Bass) .............................................. ±12 dB (100 Hz)

(Treble) ............................................ ±12 dB (10 kHz)

Loudness contour ..........+10 dB (100 Hz), +7 dB (10 kHz)

(volume: –30 dB)

Cassette player

Tape ........................ Compact cassette tape (C-30 – C-90)

Tape speed ...... 4.76 cm/sec.(+0.14 cm/sec.,-0.05 cm/sec.)

Fast forward/rewinding time ...... Approx. 90 sec. for C-60

Wow & flutter .......................................... 0.13% (WRMS)

Frequency response ...................... 40 – 14,000 Hz (±3 dB)

Stereo separation ...................................................... 45 dB

Signal-to-noise ratio...................... 52 dB (IEC-A network)

FM tuner

Frequency range ...................................... 87.5 – 108 MHz

Usable sensitivity .................................................... 11 dBf

(1.0 µV/75 Ω, mono, S/N: 30 dB)

50 dB quieting sensitivity ........................................ 16 dBf

(1.7 µV/75 Ω, mono)

Signal-to-noise ratio ...................... 70 dB (IEC-A network)

Distortion .......................... 0.3% (at 65 dBf, 1 kHz, stereo)

Frequency response ...................... 30 – 15,000 Hz (±3 dB)

Stereo separation .......................... 40 dB (at 65 dBf, 1 kHz)

MW tuner

Frequency range ...................................... 531 – 1,602 kHz

Usable sensitivity .............................. 18 µV (S/N: 20 dB)

Selectivity .................................................. 50 dB (±9 kHz)

LW tuner

Frequency range ........................................ 153 – 281 kHz

Usable sensitivity .............................. 30 µV (S/N: 20 dB)

Selectivity .................................................. 50 dB (±9 kHz)

Note:

• Specifications and the design are subject to
possible modification without notice due to
improvements.