PIONEER KEH-1906 Service Manual

Service

Manual

C.E.SUPPLY

ORDER NO.

CRT2327

CASSETTE CAR STEREO WITH FM/AM ELECTRONIC TUNER

KEH-1906ZZ2 X1R/UC

-This additional service manual is designed to be used together with Model KEH-1906ZZ/X1H/UC Service Manual CRT1721. Refer to it for finding parts numbers and adjustment,etc. which are not shown in this manual.

VEHICLE	DESTINATION	PRODUCED AFTER	PART No.	ID No.			PIONEER MODEL No.
	U.S.A, CANADA	1999					KEH-1906ZZ2/X1R/UC

ELECTRICAL PARTS LIST(Page 11)

Tuner Amp Unit

		Part No.
Symbol and Description		KEH-1906ZZ/X1H/UC	KEH-1906ZZ2/X1R/UC
Q271	Transistor	2SB1242	2SB1241
L502	Inductor	Not used	LCTBR47K2125
R501		RS1/10S101J	RS1/10S271J
R545		RS1/8S0R0J	Not used
WB Unit
		Part No.
Symbol and Description		KEH-1906ZZ/X1H/UC	KEH-1906ZZ2/X1R/UC
C802,803		CCSQCH120J50	CCSQCH150J50
C813		CCSQCH180J50	CCSQCH200J50

PIONEER ELECTRONIC 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 ELECTRONIC CORPORATION 1999

K-ZZB. FEB. 1999 Printed in Japan

1		2		3		4

KEH-1906ZZ2

3. SCHEMATIC DIAGRAM

3.1 OVERALL CONNECTION DIAGRAM (GUIDE PAGE)

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

A	PARTS LIST”.											A-a
			TUNER AMP UNIT
		2	1
		Large size	1	2	3	4	5	6	7	8	9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25	26
A-a	A-b	SCH diagram

		FM:-16dBs
A-a	A-b	AM:-22dBs
		Guide page
		AM IF
B
A-a	A-b	Detailed page

VCO AMP

3

2

1

LOOP FILTER

WB:-11.0dBs

1	2	3	4	5	6	7
1	2	3	4	5	6	7

WB UNIT

9 8 7 6 5 4 3 2 1

C

RF AMP

1ST IF 10.7MHz

1

3

5

7

9

11

13

15

17

19

DET.

2

4

6

8

10

12

14

16

18

20

				2ND IF 450kHz
TAPE +B							EQ AMP
REGULATOR
	1	2	3 4	5	6	7	8

TAPE:-22.0dBs

	(A)	TEST TAPE:
		315Hz 0dB
		-73dBs
	P.C.BOARD
D

2 A

1

2

3

4

MUTE

MECHANISM

MECH +B SW

								5																											6									7				8
																																																KEH-1906ZZ2
																																					A-b												A
																		TAPE:-28.4dBs													ELECTRONIC
																			FM:-20.4dBs
																			AM:-26.4dBs												VOLUME
																			WB:-19.4dBs
																				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
																																												POWER AMP
																																																	B
																																												20	6		25
																																												TAPE:-4dBs			5
																																												12				4
																																															2
																																															3	5
																																												11
																AM +B
																																															9
									FM +B							SWITCH																																6
																																												13			8
									SWITCH
		WB +B																																													7	7
TU +B		SWITCH																					AUDIO +B																					15			17
																							REGULATOR										SYSTEM															8
SWITCH																																															18
																																	POWER
																																												14			19
																																																9
																																															21	10
																																															24
																																												22
																																															23	11
																																												MUTE
																																											MUTE	4	16	10	1
24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
25																										80																						1	C
26																										79
																																											SYSTEM +B	VDD REGULATOR
27																										78
28																										77																	SENSE					12
29																										76
30																										75																						2
31																										74
32																										73																						3
33																										72
34																										71
35																										70
36							SYSTEM CONTORLLER																			69
37																										68
38																										67
39																										66
40																										65
41	42	43	44	45	46	47	48	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64
																																												ACC SENSE
																																												BACK UP SENSE
MECHANISM MUTE																																											ILLUMINATION POWER
																																											SWITCH
																																																	D
MECHANISM
+B SWITCH
																																																A	3
								5																											6									7				8

	D								C	B	A
4
											A-a A-b
A1	TUNER AMP UNIT
a-
2	1
	1	2	3	4	5	6	7	8	9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

2

1 1906ZZ2-KEH

2

FM:-16dBs

AM:-22dBs

AM IF

3

3

		WB +B
		SWITCH
	VCO AMP	TU +B
		SWITCH
4		4

3

2

1

LOOP FILTER

17

18

19

20

21

22

23

24

5

S

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

6

7

48

47

46

45

44

43

42

41

MUTE

MECHANISM

8

KEH-1906ZZ2

	A-b
	A-a	A

MECHANISM +B SWITCH

B

WB:-11.0dBs		WB UNIT
7	7
6	6
5	5
1 2 3 4	1 2 3 4	1	1ST IF 10.7MHz
		2
		3
		4
		5
		6
		7
		8
		9

RF AMP

19

17 15 13

11

9

7

5

3

1

DET.

20

18

16

14

12

10

8

6

4

2

450kHz	EQ AMP 7 8	TAPE:-22.0dBs
IF	6
2ND	5	C
	3 4
	2
	1
	TAPE +B REGULATOR	TEST TAPE: 315Hz 0dB -73dBs

D

BOARD.C.P(A)

A-a 5

5		6		7		8