PIONEER KEH-1906 Service Manual
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
ORDER NO.
CRT2327
CASSETTE CAR STEREO WITH FM/AM ELECTRONIC TUNER
KEH-1906ZZ2 X1R/UC
C.E.SUPPLY
- 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
2
KEH-1906ZZ2
A
1
234
B
C
D
12
34
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
PARTS LIST”.
A-a A-b
A-a
A-b
A-b
A-a
Large size
SCH diagram
Guide page
Detailed page
P.C.BOARD (A)
TUNER AMP UNIT
WB UNIT
1234
567
RF AMP
1ST IF
10.7MHz
DET.
2ND IF 450kHz
AM IF
VCO AMP
LOOP FILTER
MECHANISM
MUTE
MECHA
+B SW
EQ AMP
TAPE +B
REGULATOR
TEST TAPE:
315Hz 0dB
-73dBs
TAPE:-22.0dBs
WB:-11.0dBs
FM:-16dBs
AM:-22dBs
1234
567
1234
567
89
10 11
12 13 1415 16 17 18 19 20 21 22 23 24
25
26
246
8
101214
18
20
135
7
91113
17
19
15
16
12
34
5
6
7
8
9876
543
21
1
3
2
1
2
A-a
A
3
KEH-1906ZZ2
TU +B
SWITCH
WB +B
SWITCH
FM +B
SWITCH
AM +B
SWITCH
AUDIO +B
REGULATOR
SYSTEM
POWER
SYSTEM CONTORLLER
ELECTRONIC
VOLUME
POWER AMP
MUTE
MUTE
VDD REGULATORSYSTEM +B
SENSE
ACC SENSE
BACK UP SENSE
ILLUMINATION POWER
SWITCH
MECHANISM
MUTE
MECHANISM
+B SWITCH
TAPE:-28.4dBs
FM:-20.4dBs
AM:-26.4dBs
WB:-19.4dBs
TAPE:-4dBs
123
4
567
8
9
10
11
12131415161718192021222324
484746
45
444342
41
40
39
38373635343332313029282726
25
12
11
13
15
14
22
5
2
3
9
8
7
17
18
19
21
24
23
20
6
25
4
16
10
1
4
10
5
6
11
7
8
9
2
3
1
12
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
5
6
7
8
A
B
C
D
5
6
7
8
A-b
A
4
KEH-1906ZZ2
TUNER AMP UNIT
AM IF
VCO AMP
LOOP FILTER
TU +B
SWITCH
WB +B
SWITCH
WB: 11 0dBs
FM:-16dBs
AM:-22dBs
1234
567
89
10 11
12 13 14 15 1617 1819 20 21 22 23 24
25
26
1
3
2
1
2
A
1
234
B
C
D
12
34
A-a
A-a
A-b
5
KEH-1906ZZ2
P.C.BOARD (A)
WB UNIT
1234
567
RF AMP
1ST IF
10.7MHz
DET.
2ND IF 450kHz
S
MECHANISM
MUTE
MECHANISM
+B SWITCH
EQ AMP
TAPE +B
REGULATOR
TEST TAPE:
315Hz 0dB
-73dBs
TAPE:-22.0dBs
WB:-11.0dBs
1234
567
2
4
6
8
10
12
14
18
20
1
3
5
7
9
11
13
17
19
15
16
12
34
5
6
7
8
9876
543
21
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
24
23
22
21
20
19
18
17
41
42
43
44
45
46
47
48
5
6
7
8
A
B
C
D
5
6
7
8
A-a
A-a
A-b
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