Pioneer KEH-P490 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-ZZB. DEC. 1999 Printed in Japan
ORDER NO.
CRT2404
MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER
KEH-P490 X1N/UC
Service
Manual
KEH-P4900 X1N/UC
KEH-P4950 X1N/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 : Mechanism Description
Disassembly ,Adjustment
KEH-P490/X1M/UC CRT2398
KEH-P4900/X1M/UC CRT2398
KEH-P4950/X1M/ES CRT2398

2
KEH-P490,P4900,P4950
EXPLODED VIEWS AND PARTS LIST
PACKING (Page 2)
-PACKING SECTION PARTS LIST
Part No.
Mark No. Description KEH-P490/X1M/UC KEH-P490/X1N/UC
12 Carton CHG3893 CHG3905
13 Contain Box CHL3893 CHL3905
14 Protector CHP2244 CHP2252
15 Protector CHP2243 CHP2251
Part No.
Mark No. Description KEH-P4900/X1M/UC KEH-P4900/X1N/UC
12 Carton CHG3889 CHG3902
13 Contain Box CHL3889 CHL3902
14 Protector CHP2244 CHP2252
15 Protector CHP2243 CHP2251
Part No.
Mark No. Description KEH-P4950/X1M/ES KEH-P4950/X1N/ES
12 Carton CHG3890 CHG3903
13 Contain Box CHL3890 CHL3903
14 Protector CHP2244 CHP2252
15 Protector CHP2243 CHP2251
EXTERIOR (Page 4)
-EXTERIOR SECTION PARTS LIST
Part No.
KEH-P490/X1M/UC KEH-P490/X1N/UC
KEH-P4900/X1M/UC KEH-P4900/X1N/UC
Mark No. Description KEH-P4950/X1M/ES KEH-P4950/X1N/ES
29 Holder Unit CXB2687 CNC6798(Holder)
68 Cassette Mechanism Module EXK4000 EXK4005

3
KEH-P490,P4900,P4950
1234
A
B
C
D
1234
IC,Q
IC251
Q351
Q352
ADJ
VR302
VR301
IC253
CN252
CN254
CN253
CN255
M1
M2
HEAD ASSY
CN256
21
22
1
2
3
4
5
6
S3
70µs SW
S1
LOAD SW
S2
MODE SW
CN256
EGN1
REEL SENSE
PCB CONNECTION DIAGRAM
CASSETTE MECHANISM MODULE
DACN602
E
DCN253
DECK UNIT
DDECK UNIT
EREEL SENSE UNIT
SIDE A
SIDE B

4
KEH-P490,P4900,P4950
A
1234
B
C
D
1234
DECK UNIT
MUTE
CXA2559Q
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29 28 27
26 25
24
23
22 21
1
2 3 4
5 6
7
8
9 10
R256 220
R287
0R0
C273
22/16
R283 0R0
R284 0R0
R282 0R0
C253 330P
C254 330P
C252 330P
C251 330P
R281 0R0
R255 220
C256
R01
R258
1K
R301
18K
R273 1K
R274 1K
R271 1K
R272 1K
R290 0R
C403 R0
R403 82
C402
3900P
C401
R33
R402
R401
4R7K
R323 0R0
R257
1K
C255
R01
C272 R1
C313 100P
R286 0R0
R285 0R0
HD1
HEAD ASSY
EXA1592
TEST TAPE
NCT-150
(400Hz, 200nWb/m)
RL
RR
FR
FL
C302
R1
C301
R1
R304
R302
16K
16K
R305
16K
R303
16K
-6dBs(388mV)±1dB
Fwd-R
Fwd-L
Rev-R
Rev-L
PBFB2
PBRIN2
PBGND
PBFIN2
VCT
PBREF
PBFIN1
PBGND
PBRIN1
PBFB1
PBTC1
PBOUT1
OUTREF1 TAPEIN1 VCC
LINEOUT1
TCH1
MSLPF
MSMODE
DRSW
TAPESW
MUTESW
MSOUT
MSTC
G1FB
G2FB
PBTC2
PBOUT2
OUTREF2
TAPEIN2
GND
DIREF
LINEOUT2
TCH2
MSSW
CN252
CN251
EQ AMP
IC251
D

5
KEH-P490,P4900,P4950
5678
A
B
C
D
5678
REEL SENSE
PCB
SWITCHES:
REEL SENSE PCB
S1:LOAD SWITCH..........EJECT-PLAY
S2:MODE SWITCH............ON-OFF
The underlined indicates the switch position.
R290 0R0
C403 R068
R403 82K
C402
3900P
C401
R33
R402 18K
R401
4R7K
R351 1K
R352 1K
R353 1K
R354 1K
R373 0R0
R355 270K
C352 3900P
R362 300
C351 R22
C353 R01
C354 R01
R374 0R0
C356 R01
C355 R1
D352 1SS355
M1 MOTOR UNIT
(MAIN MOTOR)
EXA1491
S1 LOAD
ESG1007
S2
ESG1007
MODE
REEL SENSE
EGN1
EGN1004
M2
MOTOR UNIT
(SUB MOTOR)
EXA1580
RS3
RS2
RS1
SC2
SC1
TAB
MC
CE
VCC2
NC
VCC
MCS
RRS
FRS
RSB
C
TAB
MS2
NC
NC
MM
SM1
RSB
GND
RS
mtl
MCS
load
CN255
CN253 CN256
CN254
MECHANISM
DRIVER
IC351 PA2020A
E

6
KEH-P490,P4900,P4950
CASSETTE MECHANISM MODULE

7
KEH-P490,P4900,P4950
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

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-ZZB. OCT. 1999 Printed in Japan
ORDER NO.
CRT2398
MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER
KEH-P490 X1M/UC
Service
Manual
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST.......................2
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM .....9
4. PCB CONNECTION DIAGRAM ................................24
5. ELECTRICAL PARTS LIST ........................................33
6. ADJUSTMENT..........................................................40
7. GENERAL INFORMATION .......................................42
7.1 DISASSEMBLY ...................................................42
7.2 PARTS .................................................................43
7.2.1 IC.................................................................43
7.2.2 DISPLAY .....................................................47
8. OPERATIONS AND SPECIFICATIONS.....................48
KEH-P490/X1M/UC
KEH-P4950 X1M/ES
KEH-P4900 X1M/UC
-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:Mech.Description and Greasing, Disassembly, Adjustment
- This service manual does not describe the CD test mode.
For the operations in the CD test mode, refer to the CD player's Service manual.

KEH-P490,P4900,P4950
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
3
6
10
2
9
8
7
5
4
15
17
18
11
14
13
12
16
1
19
20
1. SAFETY INFORMATION
CAUTION
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.
WARNING
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of
California to cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 - Proposition 65
2

KEH-P490,P4900,P4950
3
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.
-Owner's Manual, Installation Manual
Model Part No. Language
KEH-P490/X1M/UC CRD3090 English, French
CRD3091 English, French
KEH-P4900/X1M/UC CRD3088 English, French, Spanish
CRD3089 English, French, Spanish
KEH-P4950/X1M/ES CRD3083 English, Spanish, Portuguese(B)
CRD3084 Chinese, Arabic
CRD3085 English, Spanish, Portuguese(B), Chinese, Arabic
-PACKING SECTION PARTS LIST
Part No.
Mark No. Description KEH-P490/X1M/UC KEH-P4900/X1M/UC KEH-P4950/X1M/ES
* 1 Accessory Assy CEA2350 CEA2350 CEA2350
2 Spring CBH1650 CBH1650 CBH1650
3 Screw Assy CEA2351 CEA2351 CEA2351
4 Screw CBA1304 CBA1304 CBA1304
* 5 Polyethylene Bag CEG-127 CEG-127 CEG-127
6 Screw CRZ50P090FMC CRZ50P090FMC CRZ50P090FMC
7 Screw TRZ50P080FMC TRZ50P080FMC TRZ50P080FMC
* 8 Polyethylene Bag CEG-158 CEG-158 CEG-158
9 Handle CNC5395 CNC5395 CNC5395
10 Bush CNV3930 CNV3930 CNV3930
11 Polyethylene Bag CEG1173 CEG1173 CEG-162
12 Carton CHG3893 CHG3889 CHG3890
13 Contain Box CHL3893 CHL3889 CHL3890
14 Protector CHP2244 CHP2244 CHP2244
15 Protector CHP2243 CHP2243 CHP2243
16-1 Owner’s Manual CRD3090 CRD3088 CRD3083
16-2 Owner’s Manual Not used Not used CRD3084
16-3 Installation Manual CRD3091 CRD3089 CRD3085
* 16-4 Warranty Card CRY1070 CRY1070 Not used
* 16-5 Card Not used ARY1048 Not used
17 Cord assy CDE6222 CDE6222 CDE6222
18 Case assy CXB3520 CXB3520 CXB3520
19 Battery CEX1030 Not used Not used
20 Remote Control Unit CXB4284 Not used Not used

4
KEH-P490,P4900,P4950
69
20
23
25
9
8
17
16
18
13
24
14
26
14
6
19
5
12
33
32
15 28
27
31
22
21
10
2
2
2
3
3
47
30
54
67
57
52
53
55
51
56
50
58
49
63 61
60
65
66
64
62 48
48
48
59
34
37 46
46
43
11
46
46
44
45 42
36 39
35
41
40
38
4
29
1
1
1
1
68
7
2
A
A
2.2 EXTERIOR

5
KEH-P490,P4900,P4950
1 Screw BSZ26P050FMC
2 Screw BSZ30P050FMC
3 Screw BSZ30P200FMC
4 Cord Assy CDE6222
5 Fuse(10A) CEK1136
6 Transistor(Q904) 2SD2396
7 Case CNB2350
8 Holder CNC5704
9 Cushion CNM5210
10 Insulator CNM5963
11 Panel CNS5132
12 Tuner Amp Unit See Contrast table(2)
13 Screw BPZ26P080FMC
14 Screw BSZ26P080FMC
15 Screw BSZ26P160FMC
16 FM/AM Tuner Unit See Contrast table(2)
17 Holder CNC6554
18 Pin Jack(CN301) CKB1035
19 Plug(CN603) CKM1270
20 Connector(CN701) CKS3408
21 Connector(CN602) CKS3568
22 Connector(CN601) CKS3581
23 Antenna Jack(CN402) CKX1056
24 Panel CNB2343
25 Holder CNC5399
26 Holder CNC6845
27 Holder CNC7996
28 Heat Sink CNR1505
29 Holder Unit CXB2687
30 Chassis Unit CXB3012
31 IC(IC302) TDA7384
32 Remote Control Unit See Contrast table(2)
33 Cover See Contrast table(2)
34 Button CAC4836
35 Spring CBH1834
36 Spring CBH1835
37 Spring CBH2182
38 Bracket CNC6135
39 Bracket CNC6791
40 Arm CNV4692
41 Arm CNV4693
42 Arm CNV4728
43 Panel Unit CXB4927
44 Door CAT2109
45 Spring CBH1838
46 Screw IMS20P030FZK
47 Detach Grille Assy See Contrast table(2)
48 Screw BPZ20P100FZK
49 Button(DETACH) CAC5789
50 Button(1-6) CAC6239
51 Button(SOURCE) CAC6241
52 Button(+) CAC6242
53 Button(-) CAC6243
54 Button(AUDIO) CAC6245
55 Button(EQ) CAC6247
56 Button(EJECT) CAC6268
57 Button(BAND) CAC6269
58 Spring CBH2103
59 Cover CNS5635
60 Keyboard Unit See Contrast table(2)
61 LCD(LCD1901) CAW1563
62 Connector(CN1901) CKS3580
63 Holder CNC8485
64 Sheet CNM6453
65 Connector CNV5914
66 Lighting Conductor CNV5915
67 Grille Sub Assy See Contrast table(2)
68 Cassette Mechanism ModuleEXK4000
69 Screw ISS26P055FUC
Mark No. Description Part No. Mark No. Description Part No.
(1) EXTERIOR SECTION PARTS LIST
(2) CONTRAST TABLE
KEH-P490/X1M/UC, KEH-P4900/X1M/UC and KEH-P4950/X1M/ES are constructed same except for the
following: Part No.
Mark No. Description KEH-P490/X1M/UC KEH-P4900/X1M/UC KEH-P4950/X1M/ES
12 Tuner Amp Unit CWM7021 CWM7021 CWM7025
16 FM/AM Tuner Unit CWE1467 CWE1467 CWE1486
32 Remote Control Unit CXB4284 Not used Not used
33 Cover CNS4948 Not used Not used
47 Detach Grille Assy CXB5152 CXB4788 CXB4789
60 Keyboard Unit CWM7022 CWM7024 CWM7024
67 Grille Sub Assy CXB5209 CXB5210 CXB5211

6
KEH-P490,P4900,P4950
2.3 CASSETTE MECHANISM MODULE

7
KEH-P490,P4900,P4950
1 Screw BSZ20P040FMC
2 Washer CBF1037
3 Washer CBG1003
4 Screw EBA1028
5 Screw EBA1037
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) EXA1506
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
Mark No. Description Part No. Mark No. Description Part No.
-CASSETTE MECHANISM MODULE SECTION PARTS LIST

8
KEH-P490,P4900,P4950

KEH-P490,P4900,P4950
1234
1234
D
C
B
A
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM
IC2 PA4024A
AMVCC
Q3
Q201 Q202
AM RF/AGC
FM RF
14
10
CF232
25
T31 Q31 CF51
AM IF
BFM/AM TUNER UNIT
7
9
18
6
21
15 13
19
26
25
20 17
FM PROCESSOR
IC1 PA4023B
FM/AM PROCESSOR
23
9
FM MIX FM IF FM IF
CF52 FM IF
CF53
15 17 19 47
41
34
63832
36 16 18
1
FM
OSC
AM
OSC VCC
FMVCC
FMTV
AMIFC
VCO
AMTV
T51
2
FMSD
SD
FMSL
AMSL
31 30 28 40 43
19
TUNER Lch
IC501
PM2006A
PLL
Q909
Q910
Q907
Q908
VCC
29
25
9
4
5
37 38
AMTV
FMTV
FMTV
AMTV
AMIF
FMVCO
AMVCO
X501
AM FM
Q921
Q920
B.U VDD
Q903
SYSPW
SD
SL
SYSPW
VDD
AVDD
76
53
55 74 68
SL
29
30 FM
AM
SYSTEM
CONTROLLER
PE5086A
IC601(1/2)
PLLDATA
TUN-L
TUN-L
ELECTRONIC VOLUME
PML003AM
IC301 11
10
2
5
6
3
BUS-L1
BUS-L2
TAPE-L
RL
FL
Q310
Q309
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
Q307
Q904 Q911 Q306
Q905
Q901
Q902
MUTE
8V
REGULATOR
RESET
IC602
S-80734AN
VCC
VDD
1
2
8
5
6
B.U
TX
TX
RX
RX
ASENBO
ASENBO
IP-BUS DRIVER
IC702
CA0008AM
BUSL+
BUSL-
BUS-
BUS+
Q701
Q702
8
1
5
11
7
56
61
1
54 60
1
2
66 65
70
69
37
48
38
MUTE
RESET
BSENS
ASENS
SWVDD
DPDT
KYDT
DSENS
ASEMBO
MCMUTE
STBY
MTL
LOADSW
X1
X2
SYSTEM
CONTROLLER
IC601(2/2)
PE5086A
X601
Q906
BSENS
ASENS ACC
FUSE
10A
IC901
TPD1018F
B REMOTE
51
6
B.U
SYSPW
B.U
STBY
B.U
MUTE
MTL
LOAD 42
63 895
DSENS
Q601
SWVDD
VDD
SW5V
ILL1
KYDT
DPDT
SW5V
VDD SWITCH
5
1
4
2
1
3
4
11
9
20
19
8
3
4
11
9
20
19
8
9
6
2
5
8
7
2
1
FM/AM
ANTENNA
ATUNER AMP UNIT
DDECK UNIT
CKEYBOARD UNIT
853
46
85346
LCD DRIVER
IC1901
PD6278C
DPDT
KYDT
VDD
LCDB
XO
XI
REM
REMOTE CONTROL
SENSOR
IC1902
RS-140
X1901
18
20
56 10
3
1
17
22 23
IC251
CXA2559Q
IC351
PA2020A
EQ AMP
MECHANISM
DRIVER
CN251
CN252
CN254
CN255
CN253
7
5TAPE+B
Lch
17
18
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
CN701
IP-BUS
CN402
CN301
CN603
CN601
CN1901
VCK/VDT/VST
PDI/PCK/PDO/PCE
ACC
BACK UP
FRONT-L
SPEAKER
REAR-L
SPEAKER
14
VCC
LOUT
MCMUTE
LDSW
MTL
STBY
1
9
6
2
5
8
7
1B.REMOTE
KEY MATRIX
LCD
9

FM/AM TUNER UNIT
KEYBOARD UNIT
DECK UNIT
B
C
D
10
KEH-P490,P4900,P4950
1234
1234
D
C
B
A
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-b
A-a A-b
A-b
A-a
Large size
SCH diagram
Guide page
Detailed page
A
A-a

CEK1136
TUNER AMP UNIT
A
11
KEH-P490,P4900,P4950
5678
5678
D
C
B
A
A-b
A

FM/AM TUNER UNIT
B
12
KEH-P490,P4900,P4950
1234
1234
D
C
B
A
A-a
A-a A-b
1

13
KEH-P490,P4900,P4950
5678
5678
D
C
B
A
KEYBOARD UNIT
DECK UNIT
C
D
A-a
A-a A-b
2
3