Pioneer KEH-1940, KEH-1960 Service manual

Service KEH-1940/X1M/EW
Manual	ORDER NO.
	CRT2425

HIGH POWER CASSETTE PLAYER WITH FM/MW/LW TUNER

KEH-1940 X1M/EW

KEH-1960 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

CONTENTS

1.	SAFETY INFORMATION............................................		2	7. GENERAL INFORMATION.......................................		34
2.	EXPLODED VIEWS AND PARTS LIST ......................		2	7.1 DISASSEMBLY ..................................................		34
3.	BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ..		10	7.2 PARTS ................................................................		35
4.	PCB CONNECTION DIAGRAM................................		20	7.2.1	IC ...............................................................	35
5.	ELECTRICAL PARTS LIST........................................		28	7.2.2	DISPLAY ...................................................	38
6.	ADJUSTMENT .........................................................		32	8. OPERATIONS AND SPECIFICATIONS....................		39
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

KEH-1940,1960

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.

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

14

12

11

1

7

3 2

4

9

15

16

10

6

8

2

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

3

KEH-1940,1960

2.2 EXTERIOR

4

KEH-1940,1960

(1) EXTERIOR SECTION PARTS LIST

Mark No. Description		Part No.		Mark No. Description		Part No.
1	Screw	BSZ26P050FMC	36		Spring	CBH1836
2	Screw	BSZ30P055FUC	37		Spring	CBH2307
3	Screw	BSZ30P060FMC	38		Cover	See Contrast table(2)
4	Screw	BSZ30P100FMC	39		Keyboard Unit	See Contrast table(2)
5	Cord Assy	CDE6212	40		LCD(LCD901)	CAW1568
6	Cap	CKX-003	41		Connector(CN901)	CKS3580
7	Case	CNB2481	42		Holder	CNC8525
8	Holder	CNC5704	43		Sheet	CNM6486
9	Insulator	CNM5025	44		Lighting Conductor	CNV5969
10	Cushion	CNM5210	45		Rubber	CNV5970
11	Tuner Amp Unit	CWM6740	46		Connector	CNV5972
12	Screw	BSZ26P080FMC	47		Grille Unit	See Contrast table(2)
13	Screw	BSZ26P140FMC	48		Button	CAC4836
14	FM/AM Tuner Unit	CWE1466	49		Spring	CBH1834
15	Holder	CNC6554	50		Spring	CBH1835
16	Plug(CN603)	CKM1270	51		Spring	CBH2367
17	Connector(CN601)	CKS3362	52		Bracket	CNC6135
18	Connector(CN602)	CKS3581	53		Bracket	CNC6791
19	Antenna Jack(CN301)	CKX1056	54		Arm	CNV4692
20	Panel	CNB2246	55		Arm	CNV4693
21	Holder	CNC5399	56		Arm	CNV4728
22	Holder	CNC6216	57		Panel Unit	See Contrast table(2)
23	Heat Sink	CNC6217	58		Door	See Contrast table(2)
24	Holder	CNC6845	59		Spring	CBH1838
25	Holder Unit	CXB2687	60		Panel	See Contrast table(2)
26	Chassis Unit	See Contrast table(2)	61		Screw	IMS20P030FZK
27	Detach Grille Assy	See Contrast table(2)	62		Fuse(10A)	CEK1136
28	Screw	BPZ20P120FZK	63		Cassette Mechanism Assy	EXK3410
29	Button(EJECT)	See Contrast table(2)	64		IC(IC501)	TDA7384
30	Button(REW)	See Contrast table(2)	65		Transistor(Q804)	2SD2395
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)

5

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

6

KEH-1940,1960

7

KEH-1940,1960

2.3 CASSETTE MECHANISM ASSY

8

KEH-1940,1960

- CASSETTE MECHANISM ASSY SECTION PARTS LIST

Mark No. Description		Part No.		Mark No. Description		Part No.
1	Screw	BSZ23P050FMC	46		Gear	ENV1475
2	Washer	CBG1003	47		Gear	ENV1512
3	Connector(CN1)	CKS2829	48		Gear	ENV1513
4	Screw(M2x5)	EBA1038	49		Gear	ENV1502
5	Screw(M2x2.5)	EBA1037	50		Lever	ENV1480
6	Spring	EBH1554	51		Lever	ENV1487
7	Spring	EBH1555	52		•••••
8	Spring	EBH1556	53		Arm	ENV1519
9	Spring	EBH1603	* 54		PCB	ENP1161
10	Spring	EBH1591	55		•••••
11	Spring	EBH1559	56		Switch(FWD)(REV)(S3)	ESH1006
12	Spring	EBH1593	57		Switch(Load)(S1)	ESN1016
13	Spring	EBH1561	58		Switch(Mute)(S2)	ESN1017
14	Spring	EBH1562	59		Head Assy(HD1)	EXA1466
15	Spring	EBH1563	60		Motor Unit(M1)	EXA1467
16	Spring	EBH1623	61		Flywheel Unit	EXA1547
17	Spring	EBH1565	62		•••••
18	Spring	EBH1566	63		Arm Unit	EXA1447
19	Spring	EBH1567	64		Arm Unit	EXA1448
20	Spring	EBH1568	65		Arm Unit	EXA1534
21	Spring	EBH1569	66		Reel Unit	EXA1450
22	Spring	EBH1571	67		Pinch Holder	ENV1466
23	Spring	EBH1579	68		Pinch Roller	ENV1518
24	Head Base	ENC1475	69		Pinch Holder	ENV1467
25	Lever	ENC1429	70		•••••
26	Lever	ENC1430	71		Chassis Unit	EXA1498
27	Lever	ENC1431	72		Arm	ENV1524
28	Lever	ENC1432	73		Washer	HBF-167
29	Arm	ENC1433	74-78		•••••
30	Arm	ENC1434	79		Cover	ENC1452
31	Arm	ENC1480	80		Washer	CBF1051
32	Arm	ENC1493	81		Spring	EBH1592
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

9

1		2		3		4

KEH-1940,1960

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

A

A TUNER AMP UNIT

B FM/AM TUNER UNIT

TUN-L

ILL+B

Q3

T31

Q31

CF51

CF52

CF53

T51

CN301

FM RF

FM/AM MIX FM/AM IF

FM IF

FM IF

ANT

25

26

41

9

10

14

17

19

47

1

2

FWD-L

15

FWD

FW

34

FM/AM PROCESSOR

FM PROCESSOR

FM

19

Lch

7

OSC

IC 1

PA4023B

IC 2 PA4024A

Q201 Q202

6

38

32

36

16

18

23

25

31

30

28

40

43

REV

B

Lch

AMRF/AGC

CF232 AM IF

FMSL

9

HEAD

REV-L

AMSL

FMTV

AMTV

AM

AMIFC

FMSD

18

VCO

FM+B

AM+B

TUN+B

OSC

L

19 20

15

17

21

14

13

6

GND

M

Q804

Q802

B.U

D CA

FIX+B

MOTOR

SYSPW

9V REGULATOR

Q803

ILL+B

SL

14

SL

12

C KEYBOAR

C

FMSD

FMSD

SYSTEM CONTROLLER

AMIF

VCO

FIX+B

FIX+B

IC 601 (1/2)

IL901-903

Q806

Q805

PE5107A

Q302

Q303

EO

FM

AM

LOOP FILTER

Q808

Q807

LW

FM SWITCH

AM SWITCH

AMIF

VCOIN

LW

EO

FM

AM

XI

XO

KEY MATRIX

Q304

57

3

13

6

54

51

25

24

LW

X601

4.5MHz

D

10

1

2

3

4

5

6

7

8

KEH-1940,1960

A

TUN-L

ILL+B

ELECTRONIC

9

FL+

WD-L

VOLUME

POWER AMP

6

CASSETTE

FL+

FL-

2

19

11

7

5

FWD/REV SWITCH

EQUALIZER

IC 401

FL

FL-

3

15

IC 501

SN761029DL

20

17

1

IC 201

RL

RL+

1

1

3

TDA7384

8

RL+

LA3161P

19

RL-

9

STBY

MUTE

RL-

B

4

4

22

FIX+B

SYSPW

EV-L

B.U

FWD/REV

6

6

VDT/VCK/VST

MUTE SWITCH

4

4

Q810

Q609

Q501

8

8

MUTE

LOAD SWITCH

MECHA

MUTE

9

9

LOAD

POWER SWITCH

GND

Q607

Q502

FL-

FL+

10

10

B.U

FUSE

CN601

MECPW

10A

Q608

7

BATTERY

ACC

Q809

2

D

DMINH

CASSETTE PCB

RL+

Q606

RL-

Q601

CE

ACC

B.U

VDD1

Q603

VDD2

VDD

MECHA MUTE

BRE

Q604

Q605

B.U

Q801

B REMOTE

C

BOARD UNIT

B.U

5

IC 801

1

BRE

1

B REMOTE

TPD1018F

CN901

CN602

SYSPW

6

CN603

ILL+B

4

4

3

3

SW5V

VDD

24

VDD

Q602

SYSPW

RES 17

KEY/LCD

SCK

SWVDD

DRIVER

SCK 15

5

5

SO 14

6

6

SIO

18

1

2

63

50

39

40

7

43

IC 901

SI

13

SWVDD

MCMUT

TAPLD

NOR/REV

MECPW

MUTE

DMINH

CE

SYSPW

RIX

PDC045A

9

LCK

10

LDT

SYSTEM CONTROLLER

LCD 901

CAW1568

IC 601 (2/2)

PE5107A

D

11

5

6

7

8

1		2		3		4

KEH-1940,1960

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
A TUNER AMP UNIT

A

						Large size
						SCH diagram
	A-a			A-b

A-a	A-b	Guide page
A-a	A-b	Detailed page

ELECTRONIC V

B FM/AM TUNER UNIT

AM : -26.0dBs

FM : -16.0dBs

-

B

SYSTEM CONTROLLER

C

EQ AMP

-73dBs

D

D CASSETTE PCB

12 A D

1

2

3

4

5		6		7		8

KEH-1940,1960

A-b

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

-29.0dBs

POWER AMP

TAPE : -3.9dBs

AM : -0.9dBs

FM : 9.1dBs

			RR	RR
			-	+
	BACK		FR	FR
	UP		-	+
		ANT	FL	FL
			-	+
	GND	ACC	RL	RL
			-	+

B

TAPE : 22.1dBs

FUSE

600 H

B.REMOTE

C

KEY/LCD DRIVER

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

14V 40mA

D

C KEYBOARD UNIT

A C 13

5		6		7		8