Pioneer KEH-3950 User 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-ZZD. NOV. 1999 Printed in Japan
ORDER NO.
CRT2421
HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER
KEH-3950 X1M/ES
Service
Manual
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST.......................2
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ...10
4. PCB CONNECTION DIAGRAM ................................26
5. ELECTRICAL PARTS LIST ........................................36
6. ADJUSTMENT..........................................................43
7. GENERAL INFORMATION .......................................44
7.1 DISASSEMBLY ...................................................44
7.2 PARTS .................................................................45
7.2.1 IC................................................................45
7.2.2 DISPLAY....................................................49
8. OPERATIONS AND SPECIFICATIONS.....................50
KEH-3950/X1M/ES
-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
KEH-3910 X1M/EE
HIGH POWER CASSETTE PLAYER WITH FM/MW/LW TUNER

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

3
KEH-3950,3910
-Owner's Manual, Installation Manual
Model Part No. Language
KEH-3950/X1M/ES CRD3119 English, Spanish, Portuguese(B),
CRD3121 Chinese, Arabic
-Owner's Manual, Installation Manual
Model Part No. Language
KEH-3910/X1M/EE CRD3125 English, Russian
CRD3126
10
1
13
7
11
9
8
12
2
5
4
6
3
2.2 PACKING(KEH-3910/X1M/EE)
1 Cord Assy CDE6222
2 Accessory Assy CEA1917
3 Screw CBA1304
4 Handle CNC5395
5 Bush CNV3930
* 6 Polyethylene Bag E36-615
7 Polyethylene Bag CEG-162
8 Carton CHG3847
9 Contain Box CHL3847
10 Protector CHP2243
11 Protector CHP2244
12-1 Owner’s Manual CRD3125
12-2 Installation Manual CRD3126
12-3 Polyethylene Bag CEG1116
13 Case Assy CXB3520
-PACKING SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

4
KEH-3950,3910
2.3 EXTERIOR(KEH-3950/X1M/ES)

5
KEH-3950,3910
1 Screw BSZ26P050FMC
2 Screw BSZ30P050FMC
3 Screw BSZ30P200FMC
4 Cord Assy CDE6222
5 •••••
6 Case CNB2350
7 Earth Plate CNC8368
8 Spacer CNM4913
9 Insulator CNM5963
10 Tuner Amp Unit CWM6810
11 Screw BSZ26P080FMC
12 Screw BSZ26P160FMC
13 •••••
14 FM/AM Tuner Unit CWE1501
15 Holder CNC7532
16 Plug(CN603) CKM1270
17 Connector(CN602) CKS3568
18 Connector(CN601) CKS3581
19 Antenna Jack(CN402) CKX1056
20 Panel CNB2514
21 Holder CNC5399
22 Holder CNC6845
23 Holder CNC7533
24 Holder CNC7996
25 Insulator CNM5967
26 Heat Sink CNR1505
27 Holder Unit CXB2687
28 •••••
29 Chassis Unit CXB3012
30 Detach Grille Assy CXB4854
31 Screw BPZ20P100FZK
32 Button(DETACH) CAC5789
33 Button(1-6) CAC6275
34 Button(EJECT) CAC6277
35 Button(+ -) CAC6273
36 Button(SELECT) CAC6276
37 Button(SOURCE/LOUD) CAC6495
38 Spring CBH2210
39 Cover CNS5661
40 Keyboard Unit CWM6814
41 LCD(LCD1801) CAW1560
42 Connector(CN1801) CKS3580
43 Holder CNC8517
44 Rubber CNV5954
45 Lighting Conductor CNV6274
46 Rubber CNV5968
47 Grille Unit CXB4523
48 Button CAC4836
49 Spring CBH1834
50 Spring CBH1835
51 Spring CBH2182
52 Bracket CNC6135
53 Bracket CNC6791
54 Arm CNV4692
55 Arm CNV4693
56 Arm CNV4728
57 Panel Unit CXB4927
58 Door CAT2109
59 Spring CBH1838
60 Screw IMS20P030FZK
61 Cassette Mechanism Module EXK4100
62 Screw ISS26P055FUC
63 Fuse(10A) CEK1136
64 IC(IC302) TDA7384
65 Transistor(Q904) 2SD2396
66 Pin Jack(CN301) CKB1028
67 Screw BPZ26P080FMC
68 Panel CNS5132
-EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

6
KEH-3950,3910
2.4 EXTERIOR(KEH-3910/X1M/EE)

7
KEH-3950,3910
1 Screw BSZ26P050FMC
2 Screw BSZ30P050FMC
3 Screw BSZ30P200FMC
4 Cord Assy CDE6222
5 •••••
6 Case CNB2350
7 Earth Plate CNC8368
8 Spacer CNM4913
9 Insulator CNM5963
10 Tuner Amp Unit CWM6808
11 Screw BSZ26P080FMC
12 Screw BSZ26P160FMC
13 Cord CDE6158
14 FM/AM Tuner Unit CWE1504
15 Holder CNC7532
16 Plug(CN603) CKM1270
17 Connector(CN602) CKS3568
18 Connector(CN601) CKS3581
19 Antenna Jack(CN402) CKX1056
20 Panel CNB2345
21 Holder CNC5399
22 Holder CNC6845
23 Holder CNC7533
24 Holder CNC7996
25 Insulator CNM5967
26 Heat Sink CNR1505
27 Holder Unit CXB2687
28 •••••
29 Chassis Unit CXB3012
30 Detach Grille Assy CXB4852
31 Screw BPZ20P100FZK
32 Button(DETACH) CAC5789
33 Button(1-6) CAC6275
34 Button(EJECT) CAC6277
35 Button(+ -) CAC6273
36 Button(SELECT) CAC6276
37 Button(SOURCE/LOUD) CAC6495
38 Spring CBH2210
39 Cover CNS5661
40 Keyboard Unit CWM6814
41 LCD(LCD1801) CAW1560
42 Connector(CN1801) CKS3580
43 Holder CNC8517
44 Rubber CNV5954
45 Lighting Conductor CNV5955
46 Rubber CNV5968
47 Grille Unit CXB4521
48 Button CAC4836
49 Spring CBH1834
50 Spring CBH1835
51 Spring CBH2182
52 Bracket CNC6135
53 Bracket CNC6791
54 Arm CNV4692
55 Arm CNV4693
56 Arm CNV4728
57 Panel Unit CXB4928
58 Door CAT2109
59 Spring CBH1838
60 Screw IMS20P030FZK
61 Cassette Mechanism Module EXK4100
62 Screw ISS26P055FUC
63 Fuse(10A) CEK1136
64 IC(IC302) TDA7384
65 Transistor(Q904) 2SD2396
-EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.

8
KEH-3950,3910
2.5 CASSETTE MECHANISM MODULE

9
KEH-3950,3910
1 Screw BSZ20P040FMC
2 Washer CBF1037
3 Washer CBG1003
4 Screw EBA1028
5 Screw CBA1037
6 Spring EBH1531
7 Spring EBH1624
8 Spring EBH1625
9 Spring EBH1626
10 Spring EBH1627
11 Spring EBH1628
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
46 Pinch Roller ENV1518
47 Pinch Holder Unit EXA1583
48 Pinch Roller ENV1518
49 Reel Unit EXA1585
50 Head Base Unit EXA1586
51 Lever Unit EXA1587
52 Gear Unit EXA1588
53 Motor Unit(Service) EXX1055
54 Washer HBF-179
55 Screw CBA1250
56 Bracket ENC1542
Mark No. Description Part No. Mark No. Description Part No.
-CASSETTE MECHANISM MODULE SECTION PARTS LIST

10
KEH-3950,3910
1234
1234
D
C
B
A
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM(KEH-3950/X1M/ES)
TUNER Lch
B.U VDD
Q903
SYSPW
SYSPW
VDD
AVDD
55 74 68
SYSTEM
CONTROLLER
PE5089A
IC601(1/2)
TUN-L
TUN-L
ELECTRONIC VOLUME
SN761029DL
IC301 20
19
2
3
TAPE-L
RL
FL
Q353
Q346
MUTE
MUTE
POWER AMP
TDA7384
IC302
11
15
MUTE STBY
FL
RL
FL+
FL-
RL+
RL-
22 4
9
7
19
17
SYSPW B.U
B.U
SYSPW
Q350
Q904 Q352 Q351
Q905
Q901
Q902
MUTE
8.4V
REGULATOR
RESET
IC602
S-80834ANY
VCC
VDD
54 60
1
2
66 65
70
69
30
48
MUTE
RESET
BSENS
ASENS
SWVDD
DPDT
KYDT
DSENS
RIMUTE
STBY
LOADSW
X1
X2
SYSTEM
CONTROLLER
IC601(2/2)
PE5089A
X601
Q906
BSENS
ASENS ACC
FUSE
10A
B.U
STBY
B.U
MUTE
LOAD 42
63 895
Q650
SWVDD
VDD
SW5V
ILL
KYDT
DPDT
SW5V
VDD SWITCH
5
1
4
2
1
3
4
11
9
20
19
3
4
11
9
20
19
9
6
2
1
5
8
7
2
1
ATUNER AMP UNIT
DDECK UNIT
CKEYBOARD UNIT
734 5
734 5
LCD DRIVER
IC1801
PD6293A
DPDT
KYDT
VDD
VLCD
XO
XI
X901
18
20
50 10
22 23
IC251
CXA2559Q
IC351
PA2020A
EQ AMP
MECHANISM
DRIVER
CN251
CN252
CN254
CN255
CN253
7
5TAPE+B
Lch
17
FWD
L-ch
REV
L-ch
37
36
39
18 19
17
315 6
8710
CN256 315 6
S1
LOAD
S2
MODE
EGN1
REEL
SENSE
M
M
M2
SUB
MOTOR
M1
MAIN
MOTOR
5
2
1
EREEL SENSE PCB
CN602
CN301
CN603
CN601
CN1801
VCK/VDT/VST
ACC
BACK UP
FL+
FL-
RL-
RL+
B.REMOTE
VCC
LOUT
RIMUTE
LD
STBY
9
6
5
8
7
2
KEY MATRIX
LCD
ANT1 TV ANT2 TV RF TV
IC 3
BR9010FV
AM 2ND IF 450kHz
ANTENNA
JACK
CN401
1
2
BFM/AM TUNER UNIT
27
28
FM FRONT END
Q3
Q201 Q204
AM RF
FM/AM 1ST IF 10.7MHz
T51 Q51 CF51 CF52 CF53
MIXER.IF AMP DET
IC 1
PML002A
38 39 42 44 46 63
32 19
46
6
21
18
LDET
COMP
34 33 41 44 11 12 13
69
70
54
78
65
71
75746157554533
35
22
2225 10 14 12 15 16 8 13 2 3 4
CF202
VDD
LOCL
VCC
Q411
VCC VDD
DI/DO CE2 CK CE1 SDBL SL FMSD
PCE2
TUNPCK
TUNPCE
SL
SD
PDIO
NL1 NL2
EEPROM
5
6
4
3
IC 2 PM4008A
FM MPX
25 24
Q202
32
SD
SL
TUNPCE
TUNPCK
PCE2
TUNPDO
LOCL
53
76
14
13
20
12
28 TUNPDI
11
PDIO
1
POWER SWITCH
1
6IC901
TPD1018F
SYSPW
8
8
DSENS
A
A
REAR PREOUT