PIONEER KEH-P4850 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-ZZU. MAR. 1999 Printed in Japan

ORDER NO.

CRT2333

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

KEH-P4850J ES

CONTENTS

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

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

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

4. PCB CONNECTION DIAGRAM................................20

5. ELECTRICAL PARTS LIST........................................30

6. ADJUSTMENT.........................................................36

7. GENERAL INFORMATION.......................................38

7.1 PARTS................................................................38

7.1.1 IC...............................................................38

7.1.2 DISPLAY...................................................42

7.2DISASSEMBLY...................................................43

7.3BLOCK DIAGRAM ..............................................44

8. OPERATIONS AND SPECIFICATIONS....................45

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-P4850J

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

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 mot risk trying to do so and refer the repair to a qualified service technician.

KEH-P4850J

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

Mark No. Description Part No.

1-1 Owner’s Manual CRD2788

(English, Spanish, Portuguese(B), Arabic)

1-2 Installation Manual CRD2790

(English, Spanish, Portuguese(B), Arabic)

2 Cord Assy CDE5798 3 Spring CBH-865

4 Screw Assy CEA2003 5 Screw CBA1284

* 6 Polyethylene Bag CEG-127

7 Screw CRZ50P090FMC 8 Screw TRZ50P080FMC

* 9 Polyethylene Bag CEG-158

10 Handle CNC5395 11 Bush CNV1009 12 Polyethylene Bag CEG-162

13 Carton CHG3801 14 Contain Box CHL3801 15 Protector CHP2101 16 Protector CHP2102 17 Case Assy CXB3520

18 Accessory Assy CEA2002

KEH-P4850J

2.2 EXTERIOR

KEH-P4850J

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 CWM6253 13 Screw BPZ26P080FMC 14 Screw BSZ26P080FMC 15 Screw BSZ26P160FMC

16 Tuner Unit CWE1430 17 Holder CNC6122 18 Pin Jack(CN301) CKB1028 19 Plug(CN603) CKM1270 20 Connector(CN701) CKS3408

21 Connector(CN602) CKS3568 22 Connector(CN601) CKS3581 23 Antenna Cable(CN403) CDH1274 24 Panel CNB2491 25 Holder CNC2218

26 Holder CNC6845 27 Holder CNC7996 28 Heat Sink CNR1505 29 Chassis Unit CXB3012 30 Screw ISS26P055FUC

31 Holder CNC6798 32 Detach Grille Assy CXB4247 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 CWM6264 48 LCD(LCD1901) CAW1543 49 Connector(CN1901) CKS3580 50 Holder CNC7981

51 Sheet CNM5941 52 Lighting Conductor CNV5527 53 Connector CNV5531 54 Grille Unit CXB4147 55 Button CAC5180

56 Spring CBH1834 57 Spring CBH1835 58 Spring CBH2182 59 Bracket CNC6135 60 Bracket CNC6791

61 Arm CNV4692 62 Arm CNV4693 63 Arm CNV4951 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

72 Holder CNC4963 73 Sheet CNM6292 74 Sheet CNM6293

- EXTERIOR SECTION PARTS LIST

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

KEH-P4850J

2.3 CASSETTE MECHANISM MODULE

KEH-P4850J

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

KEH-P4850J

234

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-a

Large size

SCH diagram

Guide page

Detailed page

4R7/16

7.2MHz

TUNER UNIT

DECK UNIT

KEYBOARD UNI

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

CN19

PM2006A

A-a

KEH-P4850J

3300/16

600µH

4.194MHz

PE5053A

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

IP-BUS

CEK1136

TAPE: -4.2dBs

332/16

A-b

KEH-P4850J

234

4R7/16

7.2MHz

TUNER UNIT

FM: -15.5dBs

AM: -22dBs

IP-BUS DR

ELE

PM2006A

A-a

A-b

KEH-P4850J

PE5053A

DECK UNIT

KEYBOARD UNIT

TAPE: -9dBs

SYSTEM CON

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

CN1901

A-a

A-b

KEH-P4850J

234

3300/16

600µH

4.194MHz

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

ELECTRONIC VOLUME

POWER AMP

RESET

8V REGULATER

CEK1136

TAPE: -4.2dBs

332/16

A-a

A-b

KEH-P4850J

PE5053A

CD: +2.2dBs

8V REGULATER

IP-BUS

A-b

A-a

A-b

KEH-P4850J

234

3.2 TUNER UNIT

PA4023B

KEH-P4850J

+ 34 hidden pages