PIONEER KEH P4850, KEH P4800, KEH-PP4850 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. 501 Orchard Road, #10-00, Wheelock Place, Singapore 238880

C PIONEER ELECTRONIC CORPORATION 1998

K-ZZU. OCT. 1998 Printed in Japan

ORDER NO.

CRT2261

MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER

KEH-P4800 X1M/UC

CONTENTS

1. SAFETY INFORMATION............................................2

2. EXPLODED VIEWS AND PARTS LIST ......................2

3. SCHEMATIC DIAGRAM.............................................8

4. PCB CONNECTION DIAGRAM................................22

5. ELECTRICAL PARTS LIST........................................32

6. ADJUSTMENT.........................................................39

7. GENERAL INFORMATION.......................................41

7.1 PARTS................................................................41

7.1.1 IC...............................................................41

7.1.2 DISPLAY ...................................................45

7.2DISASSEMBLY...................................................46

7.3BLOCK DIAGRAM ..............................................47

8. OPERATIONS AND SPECIFICATIONS....................48

NOTE:

- See the separate manual CX-631(CRT1640) for the cassette mechanism description.

- The cassette mechanism assy employed in this model is one of 2L series.

- 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-P4850 X1M/ES

KEH-P4850/X1M/ES

2

KEH-P4800,P4850

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

4

7

11

3

10

9

8

6

5

16

2

17

12

15

14

13

1

1. SAFETY INFORMATION

UC model

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.

W

ARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive
toxicant which may cause birth defects or other reproductive harm (California Health and Safety Code, Section

25249.5). When servicing or handling circuit boards and other components which contain lead in solder, avoid
unprotected skin contact with the solder. Also, when soldering do not inhale any smoke or fumes produced.

3

KEH-P4800,P4850

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

Part No.

Mark No. Description KEH-P4800/X1M/UC KEH-P4850/X1M/ES

* 1-1 Card ARY1048 Not used

1-2 Owner’s Manual CRD2783 CRD2785
1-3 Installation Manual CRD2784 CRD2787
1-4 Owner’s Manual Not used CRD2786

2 Cord Assy CDE5798 CDE5798
3 Spring CBH1650 CBH1650

4 Screw Assy CEA2351 CEA2351
5 Screw CBA1304 CBA1304

* 6 Polyethylene Bag CEG-127 CEG-127

7 Screw CRZ50P090FMC CRZ50P090FMC
8 Screw TRZ50P080FMC TRZ50P080FMC

* 9 Polyethylene Bag CEG-158 CEG-158

10 Handle CNC5395 CNC5395
11 Bush CNV3930 CNV3930
12 Polyethylene Bag CEG1173 CEG-162

13 Carton CHG3570 CHG3571
14 Contain Box CHL3570 CHL3571
15 Protector CHP2101 CHP2101
16 Protector CHP2102 CHP2102
17 Case Assy CXB3520 CXB3520

- Owner's Manual, Installation Manual

Model Part No. Language
KEH-P4800/X1M/UC CRD2783 English, French, Spanish

CRD2784 English, French, Spanish

KEH-P4850/X1M/ES CRD2785 English, Spanish, Portuguese(B)

CRD2786 Chinese, Arabic
CRD2787 English, Spanish,

Portuguese(B), Chinese, Arabic

4

KEH-P4800,P4850

2.2 EXTERIOR

5

KEH-P4800,P4850

1 Screw BSZ26P050FMC
2 Screw BSZ30P050FMC
3 Cord Assy CDE5798
4 Fuse(10A) CEK1136
5 Case CNB2350

6 Panel CNS5132
7 Screw BSZ30P050FMC
8 Screw BSZ30P200FMC
9 Holder CNC5704

10 Cushion CNM5210
11 Insulator CNM5963

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 Chassis Unit CXB3012
30 Screw ISS26P055FUC

31 Holder Unit CXB2687
32 Detach Grille Assy

See Contrast table(2)

33 Screw BPZ20P060FMC
34 Screw BPZ20P100FZK
35 Button(Detach) CAC5789

36 Button(1-6) CAC5794
37 Button(-) CAC5930
38 Button(EQ) CAC6135
39 Button(+) CAC5783
40 Button(Eject) CAC5793

41 Button(Display) CAC5788
42 Button(Cross) CAC5786
43 Button(A,B) CAC5787
44 Spring CBH2103
45 Cover CNS5130

46 Housing CNV5528
47 Keyboard Unit

See Contrast table(2)

48 LCD(LCD1901) CAW1543
49 Connector(CN1901) CKS3580
50 Holder CNC7981

51 Sheet CNM5941
52 Lighting Conductor CNV5527
53 Connector CNV5531
54 Grille Unit

See Contrast table(2)

55 Button CAC4836
56 Spring CBH1834

57 Spring CBH1835
58 Spring CBH2182
59 Bracket CNC6135
60 Bracket CNC6791

61 Arm CNV4692
62 Arm CNV4693
63 Arm CNV4728
64 Panel Unit CXB3019
65 Door CAT2028

66 Spring CBH1838
67 Screw IMS20P030FZK
68 Case Assy CXB3520
69

Cassette Mechanism ModuleEXK3695

70 IC(IC302) TDA7384
71 Transistor(Q904) 2SD2396

(1) EXTERIOR SECTION PARTS LIST

Mark No. Description Part No.

Mark No. Description Part No.

6

KEH-P4800,P4850

2.3 CASSETTE MECHANISM MODULE

(2)CONTRAST TABLE
KEH-P4800/X1M/UC and KEH-P4850/X1M/ES have
the same construction except for the following:

Part No.

Mark No. Description KEH-P4800/X1M/UC KEH-P4850/X1M/ES

12 Tuner Amp Unit CWM6248 CWM6249
16 FM/AM Tuner Unit CWE1467 CWE1486
32 Detach Grille Assy CXB3322 CXB3323
47 Keyboard Unit CWM6259 CWM6260
54 Grille Unit CXB4065 CXB4066

7

KEH-P4800,P4850

Mark No. Description Part No. Mark No. Description Part No.

1 Screw BSZ20P040FMC
2 Washer CBF1037
3 Washer CBF1038
4 Washer CBG1003
5 Deck Unit EWM1021

6 Screw EBA1028
7 Screw EBA1037
8 Spring EBH1531
9 Spring EBH1575

10 Plug(CN251) CKS3540
11 Spring EBH1515

12 Spring EBH1587
13 Spring EBH1517
14 Spring EBH1518
15 •••••

16 Spring EBH1537
17 Cord EDD1020
18 Photo-interrupter

(EGN2,3) EGN1006

19 Photo-interrupter(EGN1) EGN1005
20 Roller ENR1031

21 Shaft ELA1373
22 Pinch Roller ENV1518
23 Arm ENC1489
24 Arm ENC1397
25 Guide ENC1481

26 Holder ENC1417
27 Lever ENC1448
28 Arm ENC1488

* 29 Motor EXM1031

30 Belt ENT1027
31 Gear ENV1347

32 Collar ENV1508
33 Gear ENV1350
34 Flywheel ENV1500
35 Worm Gear ENV1439

36 Worm Wheel ENV1440
37 Gear ENR1028
38 Lever ENV1442
39 •••••
40 Gathering PCB ENX1037

41 Gathering PCB ENX1042
42 Switch(S1) ESG1004
43 Motor Unit(M2) EXA1485
44 Chassis Unit EXA1511
45 Pinch Holder ENV1485

46 Pinch Holder ENV1486
47 Reel Unit EXA1543
48 Head Base Unit EXA1457
49 Lever Unit EXA1438
50 Gear Unit EXA1574

51 Frame Unit EXA1458
52 Lever Unit EXA1439
53 Head Assy(HD1) EXA1506
54 Motor Unit(M1) EXA1490
55 Washer HBF-179

56 Screw BMZ20P022FMC
57 Spring EBH1545
58 Washer YE20FUC
59 Pinch Holder Unit EXA1529
60 Pinch Holder Unit EXA1528

- CASSETTE MECHANISM MODULE SECTION PARTS LIST

8

KEH-P4800,P4850

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

4R7/16

UC model

ES model

331:UC model

510:ES model

FM/AM TUNER UNIT

TAPE: -9dBs

FM: -15.5dBs
AM: -22dBs

For resistors and capacitors in the circuit diagrams, their resistance values or
capacitance values are expressed in codes:

Ex. *Resistors
Code Practical value
123 12k ohms
103 10k ohms

*Capacitors
Code Practical value
103 10kpF(0.01uF)
101/10 100uF/10V

B

D

KEYBOARD UNIT

C

DECK UNIT

A-a

A

9

KEH-P4800,P4850

5

6

7

8

A

B

C

D

5

6

7

8

102:UC
103:ES

PD4973A

TUNER AMP UNIT

CD: +2.2dBs

FM: +9.6dBs
AM: -3.1dBs
TAPE: -4dBs
CD: +10.3dBs

FM: +35.6dBs
AM: +29.1dBs
TAPE: +22.0dBs
CD: +36.3dBs

SYSTEM CONTROLLER

IP-BUS DRIVER

ELECTRONIC VOLUME

POWER AMP

RESET

8V REGULATER

A

IP-BUS

CEK1136

TAPE: -4.2dBs

CN1901

332/16

A

A-b

10

KEH-P4800,P4850

A

1

234

B

C

D

12

34

4R7/16

UC model

ES model

331:UC model

510:ES model

102:U

103:E

FM/AM TUNER UNIT

FM: -15.5dBs

AM: -22dBs

B

A-a

A-a

A-b

11

KEH-P4800,P4850

5

6

7

8

A

B

C

D

5

6

7

8

TAPE: -9dBs

SYSTEM

For resistors and capacitors in the circuit diagrams, their resistance values or

capacitance values are expressed in codes:

Ex. *Resistors

Code Practical value

123 12k ohms

103 10k ohms

*Capacitors

Code Practical value

103 10kpF(0.01uF)

101/10 100uF/10V

D

CN1901

KEYBOARD UNIT

C

DECK UNIT

A-a

A-a

A-b

12

KEH-P4800,P4850

A

1

234

B

C

D

12

34

TUNER AMP UNIT

FM: +9.6dBs

AM: -3.1dBs

TAPE: -4dBs

CD: +10.3dBs

FM: +35.6dBs

AM: +29.1dBs

TAPE: +22.0dBs

CD: +36.3dBs

IP-BUS DRIVER

ELECTRONIC VOLUME

POWER AMP

RESET

8V REGULATER

A

CEK1136

TAPE: -4.2dBs

332/16

A-a

A-b

A-b

13

KEH-P4800,P4850

5

6

7

8

A

B

C

D

5

6

7

8

PD4973A

CD: +2.2dBs

CONTROLLER

8V REGULATER

IP-BUS

A-b

A-a

A-b

14

KEH-P4800,P4850

A

1

234

B

C

D

12

34

3.2 FM/AM TUNER UNIT

- KEH-P48000/X1M/UC

B

3

1

2

FM/AM TUNER U

D1D2 RD39JSRD39JS

R1

R2

2R2M

2R2M

D6 MA157

B

15

KEH-P4800,P4850

5

6

7

8

A

B

C

D

5

6

7

8

B

IFC

A

3

1

2

FM/AM TUNER U

D1D2 RD39JSRD39JS

R1

R2

2R2M

2R2M

D6 MA157

16

KEH-P4800,P4850

A

1

234

B

C

D

12

34

- KEH-P4850/X1M/ES

B

B