Pioneer KEH-P4850J Service Manual
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Pioneer KEH-P4850J Service Manual

Pioneer KEH-P4850J Service Manual

Multi-cd control high power cassette player with fm/am/sw tuner
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Service
Manual
MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM/SW TUNER
KEH-P4850J
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.
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
PIONEER ELECTRONIC CORPORATION
PIONEER ELECTRONICS SERVICE INC.
PIONEER ELECTRONIC [EUROPE] N.V.
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER ELECTRONIC CORPORATION 1999
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
7. GENERAL INFORMATION.......................................38
7.1 PARTS ................................................................38
7.1.1 IC ...............................................................38
7.1.2 DISPLAY ...................................................42
7.2 DISASSEMBLY ...................................................43
7.3 BLOCK DIAGRAM ..............................................44
8. OPERATIONS AND SPECIFICATIONS ....................45
K-ZZU. MAR. 1999 Printed in Japan
ORDER NO.
CRT2333
ES

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Summary of Contents for Pioneer KEH-P4850J

  • Page 1: Table Of Contents

    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...

  • Page 2: Safety Information

    KEH-P4850J 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.
  • Page 3 KEH-P4850J NOTE: - Parts marked by “*”are generally unavailable because they are not in our Master Spare Parts List. ∇ mark on the product are used for disassembly. - Screws adjacent to - PACKING SECTION PARTS LIST Mark No. Description Part No.
  • Page 4 KEH-P4850J 2.2 EXTERIOR...
  • Page 5 KEH-P4850J - EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ26P050FMC 41 Button(Display) CAC5788 2 Screw BSZ30P050FMC 42 Button(Cross) CAC5786 43 Button(A,B) CAC5787 3 Cord Assy CDE5798 4 Fuse(10A) CEK1136 44 Spring...
  • Page 6 KEH-P4850J 2.3 CASSETTE MECHANISM MODULE...
  • Page 7 KEH-P4850J - CASSETTE MECHANISM MODULE SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ20P040FMC 46 Pinch Holder ENV1486 2 Washer CBF1037 47 Reel Unit EXA1543 3 Washer CBF1038 48 Head Base Unit EXA1457...

  • Page 8: Schematic Diagram

    KEH-P4850J 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”. Large size TUNER UNIT SCH diagram Guide page Detailed page FM: -15.5dBs...

  • Page 9: Tuner Amp Unit

    KEH-P4850J TUNER AMP UNIT ELECTRONIC VOLUME TAPE: -4.2dBs FM: +35.6dBs AM: +29.1dBs TAPE: +22.0dBs CD: +36.3dBs FM: +9.6dBs POWER AMP AM: -3.1dBs TAPE: -4dBs CD: +10.3dBs IP-BUS DRIVER RESET CEK1136 600µH 4.194MHz 8V REGULATER SYSTEM CONTROLLER PE5053A IP-BUS CD: +2.2dBs...
  • Page 10 KEH-P4850J...
  • Page 11 KEH-P4850J...
  • Page 12 KEH-P4850J...
  • Page 13 KEH-P4850J...
  • Page 14 KEH-P4850J 3.2 TUNER UNIT PA4023B...
  • Page 15 KEH-P4850J...
  • Page 16 KEH-P4850J 3.3 KEYBOARD UNIT CAW1543...
  • Page 17 KEH-P4850J KEYBOARD UNIT EDIT CLOCK PAUSE/ IL1901-1905:CEL1605 40mA 14V...

  • Page 18: Cassette Mechanism Module

    KEH-P4850J 3.4 CASSETTE MECHANISM MODULE DECK UNIT R302 R304 C256 R258 C253 330P R283 0R0 R256 220 R273 C254 330P R284 0R0 R272 R271 R290 R282 0R0 R274 CXA2559Q C273 C252 330P R287 22/16 C403 R068 R281 0R0 R403 82K...
  • Page 19 KEH-P4850J PCB UNIT MOTOR UNIT (MAIN MOTOR) EXA1490 LOAD R373 70µs ESG1004 ESG1004 MODE SENSE R068 3 82K EGN1 EGN1005 R402 R401 4R7K MOTOR UNIT (SUB MOTOR) EXA1485 EGN2 EGN3 R374 EGN1006 EGN1006 FWD END REV END SENSE SENSE REEL PCB...

  • Page 20: Pcb Connection Diagram

    KEH-P4850J 4. PCB CONNECTION DIAGRAM CORD ASSY 4.1 TUNER AMP UNIT TUNER AMP UNIT NOTE FOR PCB DIAGRAMS 1. The parts mounted on this PCB include all necessary parts for several destination. For further information for respective destinations, be sure to check with the schematic diagram.
  • Page 21 KEH-P4850J SIDE A IP BUS CN251...
  • Page 22 KEH-P4850J TUNER AMP UNIT...
  • Page 23 KEH-P4850J SIDE B...
  • Page 24 KEH-P4850J 4.2 TUNER UNIT SIDE A...
  • Page 25 KEH-P4850J SIDE B...
  • Page 26 KEH-P4850J 4.3 KEYBOARD UNIT SIDE A...
  • Page 27 KEH-P4850J SIDE B...
  • Page 28 KEH-P4850J 4.4 CASSETTE MECHANISM MODULE SIDE A DECK UNIT CN602 SIDE B DECK UNIT...
  • Page 29 KEH-P4850J PCB UNIT SIDE A LOAD SW EGN1 MODE SENSE 70µ SW PCB UNIT SIDE B CN253 REEL PCB Fig. 20...

  • Page 30: Electrical Parts List

    KEH-P4850J 5. ELECTRICAL PARTS LIST NOTE: - Parts whose parts numbers are omitted are subject to being not supplied. - The part numbers shown below indicate chip components. Chip Resistor RS1/_S___J,RS1/__S___J Chip Capacitor (except for CQS..) CKS.., CCS.., CSZS..=====Circuit Symbol and No.===Part Name Part No.
  • Page 31 KEH-P4850J =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/16S471J CKSQYB223K25 RS1/16S220J CKSQYB104K16 RS1/16S162J CKSRYB472K50 RS1/16S0R0J CEJA330M10 RS1/16S104J CKSRYB103K25 RS1/16S103J CKSRYB102K50 RS1/16S104J CCSRCH270J50 RS1/16S103J CKSRYB103K25 RS1/16S822J CEJAR22M50 RS1/16S822J...
  • Page 32 KEH-P4850J =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Crystal Resonator 7.200MHz CSS1379 Unit Number : CWM6253 Ceramic Resonator 4.194MHz CSS1047 Unit Name : Tuner Amp Unit Tuner Unit...
  • Page 33 KEH-P4850J =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/8S103J RD1/4PU473J RS1/10S392J RD1/4PU222J CAPACITORS RD1/4PU223J RD1/4PU222J CEJA470M10 CEJA100M16 RD1/4PU222J CKSQYB104K50 RS1/10S222J CKSQYB224K16 RS1/10S222J CKSQYB224K16 RD1/4PU222J RS1/10S222J CKSQYB224K16 CKSQYB224K16...
  • Page 34 KEH-P4850J =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CKSQYB473K50 CEJA2R2M50 CAPACITORS CKSQYB103J50 CCSQCH101J50 1901 CEAL100M16 CEJA4R7M35 1902 CKSQYB104K16 CEJA100M16 Unit Number : EWM1021 CEJA220M10 Unit Name : Deck Unit...
  • Page 35 KEH-P4850J =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- CKSYB104K50 CKSQYB103K50 CKSQYB334K16 CKSQYB472K50 CKSQYB683K16 Unit Number : Unit Name : PCB Unit Switch (Load) ESG1004 Photo-Interrupter EGN1005 Unit Number : Unit Name : Reel PCB Photo-Interrupter EGN1006 Photo-Interrupter...

  • Page 36: Adjustment

    KEH-P4850J NOTE: 6. ADJUSTMENT select C1 so that total capacity of 80pF is attained from the direction of the receiver jack. - Connection Diagram Z:Output impedance of SSG. BACK UP +14.4V DC Regulated Power Supply Lch + Ω Lch -...
  • Page 37 KEH-P4850J SW ADJUSTMENT AM SSG Displayed Adjustment Adjustment Method Level(dBf) Point (Switch Position) Frequency(MHz) Frequency(MHz) 25.700 ••••• 25.700 T231 DC V Meter(1) : 6V TUN Volt Modulation M:MONO MOD., 400Hz 30%(22.5kHz Dev.) or 400Hz 100%(75kHz Dev.) S:STEREO MOD., 1kHz, L or R=30%(20.25kHz+7.5kHz Dev.) NOTE:Before proceeding to further adjustments after switching power ON, let the tuner run for ten minutes to allow the circuits to stabilize.

  • Page 38: General Information

    KEH-P4850J 7. GENERAL INFORMATION 7.1 PARTS 7.1.1 IC CXA2559Q...
  • Page 39 KEH-P4850J - Pin Functions(PE5053A) Pin No. Pin Name Format Function and Operation ASENBO Slave power supply control output Not used ADPW A/D converter power output AVSS swvdd Grille power supply control output FM stereo input AVREF1 D/A converter standard voltage...
  • Page 40 KEH-P4850J Pin No. Pin Name Format Function and Operation CLKIN Clock input Oscillator output Oscillator input Connect to GND Sub Clock terminal TESTIN Test program mode input AVDD A/D converter analog power supply (VDD) AVREF0 A/D converter standard voltage input...
  • Page 41 KEH-P4850J - Pin Functions (PD6278C) Pin No. Pin Name Function and Operation SEG4-0 LCD segment output COM3-0 LCD common output LCD drive power supply 11-14 KS4-1 Key strobe output 15,16 KD1,2 Key data input (analogue input) Remote control reception System micro computer UART communication data input...

  • Page 42: Display

    KEH-P4850J 7.1.2 DISPLAY - CAW1543...

  • Page 43: Disassembly

    KEH-P4850J 7.2 DISASSEMBLY Removing the Case(not shown) 1. Remove the two screws. 2. Remove the case. Removing the Cassette Mechanism Module (not shown) 1. Remove the four screws. 2.Disconnect the connector, and then remove the cassette mechanism module. Removing the Panel Unit(Fig.1) Disengage the stopper at two locations indicated and remove the panel unit.

  • Page 44: Block Diagram

    KEH-P4850J 7.3 BLOCK DIAGRAM...

  • Page 45: Operations And Specifications

    KEH-P4850J 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS...
  • Page 46 KEH-P4850J...
  • Page 47 KEH-P4850J...
  • Page 48 KEH-P4850J...

  • Page 49: Specifications

    KEH-P4850J 8.2 SPECIFICATIONS General FM tuner Power source ..14.4 V DC (10.8 – 15.1 V allowable) Frequency range ........87.5 – 108 MHz Grounding system ........Negative type Usable sensitivity ............ 11 dBf (1.0 µV/75 Ω, mono, S/N: 30 dB) Max.

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