Pioneer KEH-3910, KEH-3950 Service manual

Service KEH-3950/X1M/ES
Manual	ORDER NO.
	CRT2421

HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER

KEH-3950 X1M/ES

HIGH POWER CASSETTE PLAYER WITH FM/MW/LW TUNER

KEH-3910 X1M/EE

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

Model No.	Order No.	Mech. Module	Remarks
CX-1011	CRT2406	3L	Cassette Mech. Module:Circuit Description, Mech.Description, Disassembly

CONTENTS

1.	SAFETY INFORMATION ............................................		2	7. GENERAL INFORMATION .......................................	44
2.	EXPLODED VIEWS AND PARTS LIST .......................		2	7.1 DISASSEMBLY ...................................................	44
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ...			10	7.2 PARTS .................................................................	45
4.	PCB CONNECTION DIAGRAM ................................		26	7.2.1 IC................................................................	45
5.	ELECTRICAL PARTS LIST ........................................		36	7.2.2 DISPLAY ....................................................	49
6.	ADJUSTMENT..........................................................		43	8. OPERATIONS AND SPECIFICATIONS.....................	50
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-ZZD. NOV. 1999 Printed in Japan

KEH-3950,3910

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(KEH-3950/X1M/ES)

7	1

8

5 4

6

	10
3
11	16	17
		2

15

14

12

13

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

Mark No. Description			Part No.	Mark No.			Description	Part No.
	1-1	Owner’s Manual	CRD3119		*	9	Polyethylene Bag	CEG-158
	1-2	Installation Manual	CRD3121			10	Handle	CNC5395
	1-3	Polyethylene Bag	CEG1116			11	Bush	CNV3930
	2	Cord Assy	CDE6222			12	Polyethylene Bag	CEG-162
	3	Spring	CBH1650			13	Carton	CHG3846
	4	Screw Assy	CEA2351			14	Contain Box	CHL3846
	5	Screw	CBA1304			15	Protector	CHP2243
*	6	Polyethylene Bag	CEG-127			16	Protector	CHP2244
	7	Screw	CRZ50P090FMC			17	Case Assy	CXB3520
	8	Screw	TRZ50P080FMC

2

KEH-3950,3910

- Owner's Manual, Installation Manual

Model		Part No.		Language
KEH-3950/X1M/ES		CRD3119		English, Spanish, Portuguese(B),
		CRD3121		Chinese, Arabic
2.2 PACKING(KEH-3910/X1M/EE)
		4	2	12
	3
		5
			10	13
				1

11 7

9

8

- PACKING SECTION PARTS LIST

Mark No. Description			Part No.	Mark No.		Description	Part No.
	1	Cord Assy	CDE6222		11	Protector	CHP2244
	2	Accessory Assy	CEA1917	12-1		Owner’s Manual	CRD3125
	3	Screw	CBA1304	12-2		Installation Manual	CRD3126
	4	Handle	CNC5395	12-3		Polyethylene Bag	CEG1116
	5	Bush	CNV3930	13		Case Assy	CXB3520
*	6	Polyethylene Bag	E36-615
	7	Polyethylene Bag	CEG-162
	8	Carton	CHG3847
	9	Contain Box	CHL3847
	10	Protector	CHP2243

- Owner's Manual, Installation Manual

Model	Part No.	Language
KEH-3910/X1M/EE	CRD3125	English, Russian
	CRD3126

3

KEH-3950,3910

2.3 EXTERIOR(KEH-3950/X1M/ES)

4

KEH-3950,3910

- EXTERIOR SECTION PARTS LIST

Mark No. Description		Part No.	Mark No.		Description	Part No.
1	Screw	BSZ26P050FMC	36		Button(SELECT)	CAC6276
2	Screw	BSZ30P050FMC	37		Button(SOURCE/LOUD)	CAC6495
3	Screw	BSZ30P200FMC	38		Spring	CBH2210
4	Cord Assy	CDE6222	39		Cover	CNS5661
5	•••••		40		Keyboard Unit	CWM6814
6	Case	CNB2350	41		LCD(LCD1801)	CAW1560
7	Earth Plate	CNC8368	42		Connector(CN1801)	CKS3580
8	Spacer	CNM4913	43		Holder	CNC8517
9	Insulator	CNM5963	44		Rubber	CNV5954
10	Tuner Amp Unit	CWM6810	45		Lighting Conductor	CNV6274
11	Screw	BSZ26P080FMC	46		Rubber	CNV5968
12	Screw	BSZ26P160FMC	47		Grille Unit	CXB4523
13	•••••		48		Button	CAC4836
14	FM/AM Tuner Unit	CWE1501	49		Spring	CBH1834
15	Holder	CNC7532	50		Spring	CBH1835
16	Plug(CN603)	CKM1270	51		Spring	CBH2182
17	Connector(CN602)	CKS3568	52		Bracket	CNC6135
18	Connector(CN601)	CKS3581	53		Bracket	CNC6791
19	Antenna Jack(CN402)	CKX1056	54		Arm	CNV4692
20	Panel	CNB2514	55		Arm	CNV4693
21	Holder	CNC5399	56		Arm	CNV4728
22	Holder	CNC6845	57		Panel Unit	CXB4927
23	Holder	CNC7533	58		Door	CAT2109
24	Holder	CNC7996	59		Spring	CBH1838
25	Insulator	CNM5967	60		Screw	IMS20P030FZK
26	Heat Sink	CNR1505	61		Cassette Mechanism Module EXK4100
27	Holder Unit	CXB2687	62		Screw	ISS26P055FUC
28	•••••		63		Fuse(10A)	CEK1136
29	Chassis Unit	CXB3012	64		IC(IC302)	TDA7384
30	Detach Grille Assy	CXB4854	65		Transistor(Q904)	2SD2396
31	Screw	BPZ20P100FZK	66		Pin Jack(CN301)	CKB1028
32	Button(DETACH)	CAC5789	67		Screw	BPZ26P080FMC
33	Button(1-6)	CAC6275	68		Panel	CNS5132
34	Button(EJECT)	CAC6277
35	Button(+ -)	CAC6273

5

KEH-3950,3910

2.4 EXTERIOR(KEH-3910/X1M/EE)

6

KEH-3950,3910

- EXTERIOR SECTION PARTS LIST

Mark No. Description		Part No.	Mark No.		Description	Part No.
1	Screw	BSZ26P050FMC	31		Screw	BPZ20P100FZK
2	Screw	BSZ30P050FMC	32		Button(DETACH)	CAC5789
3	Screw	BSZ30P200FMC	33		Button(1-6)	CAC6275
4	Cord Assy	CDE6222	34		Button(EJECT)	CAC6277
5	•••••		35		Button(+ -)	CAC6273
6	Case	CNB2350	36		Button(SELECT)	CAC6276
7	Earth Plate	CNC8368	37		Button(SOURCE/LOUD)	CAC6495
8	Spacer	CNM4913	38		Spring	CBH2210
9	Insulator	CNM5963	39		Cover	CNS5661
10	Tuner Amp Unit	CWM6808	40		Keyboard Unit	CWM6814
11	Screw	BSZ26P080FMC	41		LCD(LCD1801)	CAW1560
12	Screw	BSZ26P160FMC	42		Connector(CN1801)	CKS3580
13	Cord	CDE6158	43		Holder	CNC8517
14	FM/AM Tuner Unit	CWE1504	44		Rubber	CNV5954
15	Holder	CNC7532	45		Lighting Conductor	CNV5955
16	Plug(CN603)	CKM1270	46		Rubber	CNV5968
17	Connector(CN602)	CKS3568	47		Grille Unit	CXB4521
18	Connector(CN601)	CKS3581	48		Button	CAC4836
19	Antenna Jack(CN402)	CKX1056	49		Spring	CBH1834
20	Panel	CNB2345	50		Spring	CBH1835
21	Holder	CNC5399	51		Spring	CBH2182
22	Holder	CNC6845	52		Bracket	CNC6135
23	Holder	CNC7533	53		Bracket	CNC6791
24	Holder	CNC7996	54		Arm	CNV4692
25	Insulator	CNM5967	55		Arm	CNV4693
26	Heat Sink	CNR1505	56		Arm	CNV4728
27	Holder Unit	CXB2687	57		Panel Unit	CXB4928
28	•••••		58		Door	CAT2109
29	Chassis Unit	CXB3012	59		Spring	CBH1838
30	Detach Grille Assy	CXB4852	60		Screw	IMS20P030FZK
			61		Cassette Mechanism Module EXK4100
			62		Screw	ISS26P055FUC
			63		Fuse(10A)	CEK1136
			64		IC(IC302)	TDA7384
			65		Transistor(Q904)	2SD2396

7

KEH-3950,3910

2.5 CASSETTE MECHANISM MODULE

8

KEH-3950,3910

- CASSETTE MECHANISM MODULE SECTION PARTS LIST

Mark No. Description		Part No.	Mark No. Description			Part No.
1	Screw	BSZ20P040FMC	46		Pinch Roller	ENV1518
2	Washer	CBF1037	47		Pinch Holder Unit	EXA1583
3	Washer	CBG1003	48		Pinch Roller	ENV1518
4	Screw	EBA1028	49		Reel Unit	EXA1585
5	Screw	CBA1037	50		Head Base Unit	EXA1586
6	Spring	EBH1531	51		Lever Unit	EXA1587
7	Spring	EBH1624	52		Gear Unit	EXA1588
8	Spring	EBH1625	53		Motor Unit(Service)	EXX1055
9	Spring	EBH1626	54		Washer	HBF-179
10	Spring	EBH1627	55		Screw	CBA1250
11	Spring	EBH1628	56		Bracket	ENC1542
12	Cord	EDD1024
13	Photo-reflector(EGN1)	EGN1004
14	Arm	ENC1526
15	Lever	ENC1530
16	Lever	ENC1531
17	Arm	ENC1532
18	Frame	ENC1533
19	Holder	ENC1534
20	Gear	ENC1535
21	Arm	ENC1536
22	Roller	ENR1040
23	Belt	ENT1027
24	Collar	ENV1508
25	Arm	ENV1539
26	Arm	ENV1540
27	Gear	ENV1544
28	Gear	ENV1547
29	Gear	ENV1548
30	Worm Wheel	ENV1550
31	Lever	ENV1551
32	Flywheel	ENV1554
33	Gathering PCB	ENX1054
34	Switch(S1,S2)	ESG1007
35	Deck Unit	EWM1023
36	Plug(CN251)	CKS3540
37	Gathering PCB	ENX1053
38	Motor Unit(M1)	EXA1491
39	Motor	EXM1028
40	Head Assy(HD1)	EXA1592
41	Motor Unit(M2)	EXA1580
42	Screw	BMZ20P022FMC
43	Bracket	ENC1528
44	Chassis Unit	EXA1582
45	Pinch Holder Unit	EXA1584

9

	1		2		3		4

KEH-3950,3910

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM(KEH-3950/X1M/ES)

ATUNER AMP UNIT

BFM/AM TUNER UNIT

A

B

C

D

ANTENNA

JACK

			FM FRONT END			FM/AM 1ST IF 10.7MHz															FM MPX
CN401			Q3				T51 Q51 CF51			CF52 CF53
1		27																25			24														TUNER Lch
																	32								19
2																			IC 2 PM4008A							6											Q903
					38		39		42	44				46	63
																	34		33	41	44	11	12	13	46
		ANT1TV	ANT2TV													69																				B.U			VDD
					22
				RFTV												70
								MIXER.IF AMP DET								54									COMP 21
									IC 1							78									LDET	18
									PML002A							65
			Q201 Q204		35											71
					33 32 45		55	57	CF202	61	74			75
		28																																		SYSPW
															EEPROM																								68
			AM RF											5			4																				55	74
																IC 3																					SYSPW	AVDD	VDD
								VDD
					Q202		AM 2ND IF 450kHz							6	BR9010FV		3
								VCC						DI/DO			CE2	CK	CE1	SDBL	SL	FMSD	NL1	NL2													SYSTEM
					25							22	10	14			12	15	16	8	13	2	3	4
						Q411																												53			CONTROLLER
														PDIO			PCE2	TUNPCK	TUNPCE		SL	SD													SD
																																					PE5089A
						LOCL
																																		76	SL		IC601(1/2)
																																		14	TUNPCE
									VCC										VDD															13	TUNPCK
																																		20	PCE2
																																		12
																																			TUNPDO
																																	PDIO	11
																																			TUNPDI
																																		28
																																			LOCL
																					ELECTRONIC VOLUME									TUN-L
																	TUN-L		2															Q346			CN301
																								IC301				RL	20					MUTE				2
																																							REAR PREOUT
																TAPE-L			3				SN761029DL					FL	19			MUTE						1
																																Q353
																									VCK/VDT/VST					15			TDA7384				CN603
																																POWER AMP
																																			FL+	9	6		6	FL+
																																				7
																														11			IC302		FL-		5		5	FL-
																															FL
																												Q350			RL				RL-	19	9		9	RL-
																										MUTE						MUTE	STBY		RL+	17	8		8	RL+
																												Q352		Q351		22	4
																																		B.U			7
																																	SYSPW						7	BACK UP
																																	Q901				FUSE
																																						10A
																																	BSENS
																													Q905
																														B.U			Q902
																										A						ASENS			ACC
			D DECK UNIT																																		2		2	ACC
																									1
			CN252																										Q906
									CN251																	SYSPW											1		1
		1												VCC																		POWER SWITCH
FWD					EQ AMP			5	TAPE+B	4			4
																										60	66	65		SYSPW			IC901
L-ch			37																												6			1
		5	36		IC251				7	3			3	LOUT					MUTE						RESET		BSENS	ASENS				TPD1018F
REV			39		CXA2559Q				Lch
L-ch		4																												70
							17																						X1
																														X601
		CN254							MUTE	9				RIMUTE		30						SYSTEM																		B.REMOTE
M2													9				RIMUTE												X2	69
	M	2	MECHANISM																		CONTROLLER
SUB				DRIVER					B.U 20
MOTOR		1					19						20	B.U								IC601(2/2)
					18									STBY		48
			5		IC351		17		STBY 19				19				STBY					PE5089A
			2
			1	PA2020A
M1	M		CN255																					DSENS	KYDT DPDT SWVDD
MAIN				8	7	10			LOAD					LD		42	LOADSW
MOTOR			CN253							11			11
													CN602
				3	1	5			6
																								63	8	9	5

3 1 5		6					VDD
CN256
EGN1			A		SWVDD			Q650
REEL
SENSE								VDD SWITCH
S2		S1						SW5V
	LOAD
MODE
E REEL SENSE PCB		DSENS	ILL	KYDT	DPDT		SW5V	CN601
		8	7	3	4		5
		8	7	3	4		5
		C KEYBOARD UNIT						CN1801
						50		10
					18	DPDT		VDD VLCD
					20	KYDT
		KEY MATRIX						LCD DRIVER
								IC1801
								PD6293A
		LCD				XO		XI
						22		23

X901

10

	1		2		3		4

	1		2		3		4

KEH-3950,3910

3.2 BLOCK DIAGRAM(KEH-3910/X1M/EE)

ATUNER AMP UNIT

BFM/AM TUNER UNIT

ANTENNA

JACK

	FM FRONT END		FM/AM 1ST IF 10.7MHz														FM MPX
CN401	Q3			T51 Q51 CF51				CF52 CF53																			A
														25			24
1																								TUNER Lch
27												32									19
2															IC 2 PM4008A							6			Q903
			38	39		42		44		46	63	34		33		41	44	11	12	13	46
ANT1TV	ANT2TV										69														B.U		VDD
			22
		RFTV									70
					MIXER.IF AMP DET						54										COMP 21
						IC 1					78										LDET 18
						PML002A					65
	Q201 Q204		35								71
			33 32 45	55	57	CF202	61	74		75
28																									SYSPW
											EEPROM																68
	AM RF									5		4													55	74
											IC 3														SYSPW	AVDD	VDD
					VDD
		Q202		AM 2ND IF 450kHz						6	BR9010FV	3
					VCC					DI/DO		CE2	CK		CE1	SDBL	SL	FMSD	NL1	NL2					SYSTEM
			25					22	10	14		12	15		16	8	13	2	3		4
																									CONTROLLER
			Q411							PDIO		PCE2	TUNPCK		TUNPCE		SL	SD					53	SD
																									PE5089A
			LOCL
																							76	SL	IC601(1/2)
																							14	TUNPCE
						VCC									VDD								13	TUNPCK
																							20	PCE2
																							12
																								TUNPDO
																							PDIO 11
																								TUNPDI
																							28
																								LOCL
																	ELECTRONIC VOLUME						TUN-L

													TUN-L	2																B
															IC301
																				RL	20
													TAPE-L	3	SN761029DL					FL	19
																VCK/VDT/VST						15			TDA7384		CN603
																								POWER AMP
																										FL+	9	6	6	FL+
																											7
																						11			IC302	FL-		5	5	FL-
																							FL
																				Q350			RL			RL-	19	9	9	RL-
																		MUTE						MUTE	STBY	RL+	17	8	8	RL+
																				Q352		Q351		22	4
																										B.U		7
																									SYSPW				7	BACK UP
																									Q901				FUSE
																													10A
																									BSENS
																					Q905
																						B.U			Q902
																		A						ASENS		ACC
			D DECK UNIT																									2	2	ACC
																1
			CN252																		Q906
								CN251										SYSPW										1	1
		1									VCC													POWER SWITCH
FWD					EQ AMP		5	TAPE+B	4	4
																	60		66	65		SYSPW			IC901
L-ch			37																				6			1
		5	36		IC251			7	3	3	LOUT		MUTE				RESET		BSENS	ASENS				TPD1018F
REV			39		CXA2559Q			Lch
																														C
L-ch		4																				70
						17															X1
																						X601
			CN254					MUTE	9		RIMUTE	30			SYSTEM															B.REMOTE
M2		2								9			RIMUTE								X2	69			TEL MUTE
	M		MECHANISM												CONTROLLER
SUB		1	DRIVER					B.U	20
MOTOR						19				20	B.U				IC601(2/2)							64
					18															TELIN										TEL MUTE
			5		IC351		17	STBY 19		19	STBY	48	STBY		PE5089A										Q951		CN901
			2
			1	PA2020A
M1	M		CN255												DSENS	KYDT	DPDT	SWVDD
MAIN			8		7	10		LOAD			LD	42	LOADSW
MOTOR			CN253						11	11
				3	1	5		6			CN602
															63	8	9		5
			CN256	3	1	5		6																		VDD
			EGN1																				A		SWVDD	Q650
			REEL
			SENSE																							VDD SWITCH

S2	S1						SW5V
MODE	LOAD
E REEL SENSE PCB		DSENS	ILL	KYDT	DPDT	SW5V	CN601
		8	7	3	4	5
		8	7	3	4	5
		C KEYBOARD UNIT					CN1801

	50	10
18	DPDT	VDD	VLCD	D
20	KYDT

	KEY MATRIX	LCD DRIVER
		IC1801
		PD6293A

	LCD	XO	XI
		22	23

X901

11

	1		2		3		4

	1		2		3		4

KEH-3950,3910

3.3 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 TUNER AMP UNIT	A-a
		Large size	ANTENNA JACK
A-a	A-b	SCH diagram
			B			KEH-3950/X1M/ES KEH-3910/X1M/EE
				FM/AM TUNER UNIT	C462,463	183	123
					R460,461	272	162	SOU
					R464,465	162	272
A-a					FM(100%)(ES) : -19.5dBs			ELEC
	A-b	Guide page			FM(100%)(ES) : -15.5dBs
					AM(30%)(ES) : -30dBs
					AM(30%)(ES) : -26dBs
A-a	A-b	Detailed page
								FM(
								FM(
								AM
								AM
								TAP

B

C

						MECHANISM
				E
				D
D						CASSETTE	MODULE
	12
		A

			KEH-3950/X1M/ES KEH-3910/X1M/EE
		R602	223	NOT USED
		R603	223	473
	KEH-3950/X1M/ES KEH-3910/X1M/EE			RESET
C491	102	101
C494	103	Not used
		SYSTEM CONTROLLER
				PE5089A

NOTE :
Symbol indicates a resistor.	For resistors and capacitors in the circuit diagrams, their resistance values or
No differentiation is made between chip resistors and	capacitance values are expressed in codes:
discrete resistors.
Symbol indicates a capacitor.	Ex. *Resistors
No differentiation is made between chip capacitors and	Code	Practical value
discrete capacitors.	123	12k ohms
The > mark found on some component parts indicates	103	10k ohms
the importance of the safety factor of the part.	*Capacitors
Therefore, when replacing, be sure to use parts of	Code	Practical value
identical designation.	103	0.01uF
TAPE 315Hz(0dB)	101/10	100uF/10V
: -7.9dBs

	1		2		3		4

	5		6		7		8

KEH-3950,3910

A-b

A

CE SELECTOR/

TRONIC VOLUME

ES): -19.5dBs
EE): -15.5dBs
ES) : -30.0dBs	KEH-3950/X1M/ES
EE) : -26.0dBs
E : -7.9dBs
		R-CH
		REAR
		PREOUT
		L-CH
		TAPE(ES) : -4.2dBs
	POWER AMP	FM(ES) : 31.5dBs
		FM(EE) : 33.5dBs
FM(ES): 5.5dBs	3300/16	AM(ES) : 21.0dBs
		TAPE : 23.1dBs
		AM(EE) : 25.0dBs
FM(EE): 7.5dBs		B
AM (ES): -5.0dBs
AM (EE): -1.0dBs
TAPE : -2.9dBs

SYSTEM MUTE

8.4V REGULATOR

600 H

>CEK1136

OFF MUTE

KEH-3910/X1M/EE

R483	R482
100	0R0

5V REGULATOR

C

		SWD 5V
		ACC SENSE
		752
		POWER SWITCH
		BACK UP SENSE
		KEH-3910/X1M/EE
		TEL MUTE
C	KEYBOARD UNIT	TELEPHONE MUTE

D

A 13

	5		6		7		8

a-A 14 1

2

D		C		B

A TUNER AMP UNIT

ANTENNA JACK

							KEH-3950/X1M/ES KEH-3910/X1M/EE
	B					C462,463	183	123
				FM/AM TUNER UNIT
						R460,461	272	162
						R464,465	162	272

FM(100%)(ES) : -19.5dBs

FM(100%)(ES) : -15.5dBs

AM(30%)(ES) : -30dBs

AM(30%)(ES) : -26dBs

A

A-a A-b

SOURCE SE

ELECTRONI

1

FM(ES): -19.5d

FM(EE): -15.5d

AM(ES) : -30.0

AM(EE) : -26.0

TAPE : -7.9dBs

1 3950,3910-KEH

2

3				3
			KEH-3950/X1M/ES KEH-3910/X1M/EE
		R602	223	NOT USED
		R603	223	473
				2
	KEH-3950/X1M/ES KEH-3910/X1M/EE			RESET
C491	102	101
C494	103	Not used
4				4

5

6

					MECHANISM MODULE
7				E
				D
					CASSETTE
8		a-A
		15

SYSTEM CONTROLLER

PE5089A

5

3

NOTE :		6
Symbol indicates a resistor.	For resistors and capacitors in the circuit diagrams, their resistance values or
No differentiation is made between chip resistors and	capacitance values are expressed in codes:
discrete resistors.
Symbol indicates a capacitor.	Ex. *Resistors
No differentiation is made between chip capacitors and	Code	Practical value
discrete capacitors.	123	12k ohms
The > mark found on some component parts indicates	103	10k ohms
the importance of the safety factor of the part.	*Capacitors
Therefore, when replacing, be sure to use parts of	Code	Practical value
identical designation.	103	0.01uF
TAPE 315Hz(0dB)	101/10	100uF/10V
: -7.9dBs

7

			8 3950,3910-KEH
	A-a	A-b

D

C

B

A

D

b-A 16 1

CE SELECTOR/ TRONIC VOLUME

1

2

ES): -19.5dBs EE): -15.5dBs (ES) : -30.0dBs (EE) : -26.0dBs E : -7.9dBs

3

2

4

C		B		A

A-a	A-b	3950,3910-KEH	1

2

	KEH-3950/X1M/ES
		R-CH
			REAR
			PREOUT
		L-CH
		TAPE(ES) : -4.2dBs
	POWER AMP	FM(ES) : 31.5dBs
		FM(EE) : 33.5dBs
FM(ES): 5.5dBs	3300/16	AM(ES) : 21.0dBs	3
		TAPE : 23.1dBs
		AM(EE) : 25.0dBs
FM(EE): 7.5dBs
AM (ES): -5.0dBs
AM (EE): -1.0dBs
TAPE : -2.9dBs

SYSTEM MUTE

4

8.4V REGULATOR

600 H

>CEK1136

	5	6		7	8
					KEH-3950,3910
				MUTE		A-b
				TEL		-a
						A
						A
	REGULATOR5V	POWER SWITCH		KEH-3910/X1M/EE	TELEPHONEMUTE	B
OFF MUTE		ACC SENSE	BACK UP SENSE
		752
						C
3910/X1M/EE		SWD 5V
KEH-
R482	0R0			KEYBOARDUNIT
R483	100		C			D
		3			A-b
						17
	5	6		7	8

	1		2		3		4

KEH-3950,3910

3.4 FM/AM TUNER UNIT(KEH-3950/X1M/ES)

A A

B FM/AM TUNER UNIT

Mark	Band	Input Level
None	–	–
F0	FM	0dBf
F65	FM	65dBf
F125	FM	125dBf
A0	AM	0dB
A74	AM	74dB
A125	AM	125dB

B

KV1410(23)

C

DAN217U

DAN217U

D

18 B

	1		2		3		4