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Service
Manual
MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER
KEH-P4800
KEH-P4850
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................................22
5. ELECTRICAL PARTS LIST........................................32
6. ADJUSTMENT .........................................................39
PIONEER ELECTRONIC CORPORATION
PIONEER ELECTRONICS SERVICE INC.
PIONEER ELECTRONIC [EUROPE] N.V.
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 501 Orchard Road, #10-00, Wheelock Place, Singapore 238880
C PIONEER ELECTRONIC CORPORATION 1998
KEH-P4850/X1M/ES
X1M/ES
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.......................................41
7.1 PARTS ................................................................41
7.1.1 IC ...............................................................41
7.1.2 DISPLAY ...................................................45
7.2 DISASSEMBLY ...................................................46
7.3 BLOCK DIAGRAM ..............................................47
8. OPERATIONS AND SPECIFICATIONS ....................48
K-ZZU. OCT. 1998 Printed in Japan
ORDER NO.
CRT2261
X1M/UC

Summary of Contents

  • Page 1

    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...

  • Page 2

    KEH-P4800,P4850 2.2 EXTERIOR...

  • Page 3

    KEH-P4800,P4850 (1) EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ26P050FMC 36 Button(1-6) CAC5794 2 Screw BSZ30P050FMC 37 Button(-) CAC5930 3 Cord Assy CDE5798 38 Button(EQ) CAC6135 4 Fuse(10A) CEK1136 39 Button(+) CAC5783 5 Case CNB2350...

  • Page 4

    KEH-P4800,P4850 (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...

  • Page 5

    KEH-P4800,P4850 - 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 4 Washer CBG1003 49 Lever Unit...

  • Page 6: Exploded Views And Parts List, Schematic Diagram, Electrical Parts List

    KEH-P4800,P4850 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 FM/AM TUNER UNIT SCH diagram Guide page FM: -15.5dBs AM: -22dBs Detailed page UC model ES model...

  • Page 7

    KEH-P4800,P4850 TUNER AMP UNIT ELECTRONIC VOLUME TAPE: -4.2dBs FM: +35.6dBs AM: +29.1dBs TAPE: +22.0dBs CD: +36.3dBs FM: +9.6dBs AM: -3.1dBs POWER AMP TAPE: -4dBs CD: +10.3dBs IP-BUS DRIVER CEK1136 RESET 102:UC 103:ES 8V REGULATER SYSTEM CONTROLLER PD4973A CD: +2.2dBs IP-BUS CN1901...

  • Page 8

    KEH-P4800,P4850 4R7/16 model 510:ES model 331:UC...

  • Page 9

    KEH-P4800,P4850 UNIT DECK...

  • Page 10

    KEH-P4800,P4850 332/16...

  • Page 11

    KEH-P4800,P4850...

  • Page 12

    KEH-P4800,P4850 3.2 FM/AM TUNER UNIT - KEH-P48000/X1M/UC FM/AM TUNER U...

  • Page 13

    KEH-P4800,P4850 ER UNIT...

  • Page 14

    KEH-P4800,P4850 - KEH-P4850/X1M/ES FM/AM TUNER U...

  • Page 15

    KEH-P4800,P4850 ER UNIT...

  • Page 16

    KEH-P4800,P4850 3.3 KEYBOARD UNIT CAW1543...

  • Page 17

    KEH-P4800,P4850 KEYBOARD UNIT EDIT CLOCK PAUSE/BSM IL1901-1905:CEL1605 40mA 14V...

  • Page 18

    KEH-P4800,P4850 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 C251 330P C402 R402...

  • Page 19

    KEH-P4800,P4850 PCB UNIT MOTOR UNIT (MAIN MOTOR) EXA1490 LOAD R373 70 s 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 C356 SWITCHES:...

  • Page 20

    KEH-P4800,P4850 PCB UNIT SIDE A LOAD SW EGN1 MODE SENSE 70 SW PCB UNIT SIDE B CN253 1 2 3 4 5 6 REEL PCB Fig. 20...

  • Page 21

    KEH-P4800,P4850 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 22

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S0R0J RS1/10S473J (UC model) RS1/10S0R0J RS1/10S620J RS1/10S102J RS1/10S101J RS1/8S0R0J RS1/10S101J RS1/10S562J RS1/10S473J RS1/10S473J RS1/10S473J RS1/10S152J RS1/10S102J RS1/10S472J RS1/10S102J RS1/10S222J RS1/10S102J RS1/10S822J RS1/10S223J...

  • Page 23

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CKSQYB153K50 1906 Switch CSG1111 CKSQYB153K50 1907 Switch CSG1111 CKSQYB473K50 1908 Switch CSG1111 CKSQYB473K50 1909 Switch CSG1111 CKSQYB223K25 1910 Switch CSG1111 CKSQYB223K50 1911...

  • Page 24

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Inductor LCTB2R2K2125 RS1/16S101J Coil CTC1133 RS1/16S102J Coil CTC1132 RS1/16S471J Ferri-Inductor LAU150K RS1/16S822J Ferri-Inductor LAU4R7K RS1/16S822J Ferri-Inductor LAU330K RS1/16S102J Inductor CTF1287 RS1/16S272J Inductor...

  • Page 25

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CCSRCH151J50 Diode KV1410-F1 CKSRYB103K25 Diode MA157 CKSRYB472K50 Diode MA157 CKSQYB104K16 Diode SVC253 CEJA3R3M50 Coil CTC1133 CKSQYB104K16 Inductor LCTB2R2K2125 CEJA3R3M50 Coil CTC1133 CKSYB474K16...

  • Page 26

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/16S223J CKSRYB182K50 RS1/16S223J CKSRYB682K25 RS1/16S225J CEJA2R2M50 RS1/16S103J CKSRYB103K25 RS1/16S220J CCSRCH151J50 RS1/16S101J CKSRYB103K25 RS1/16S102J CKSRYB472K50 RS1/16S471J CKSQYB104K16 RS1/16S822J CEJA3R3M50 RS1/16S822J CKSQYB104K16 RS1/16S102J CEJA3R3M50...

  • Page 27

    KEH-P4800,P4850 =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- RS1/16S102J RS1/16S102J RS1/16S102J RS1/8S0R0J RS1/8S0R0J RS1/8S0R0J RS1/8S0R0J RS1/16S0R0J RS1/16S0R0J RS1/8S0R0J RS1/8S0R0J RS1/16S183J RS1/16S163J RS1/16S163J RS1/16S163J RS1/16S163J RS1/8S0R0J RS1/16S102J RS1/16S102J RS1/16S102J RS1/16S102J RS1/10S274J RS1/8S181J RS1/8S0R0J RS1/8S0R0J RS1/16S472J RS1/16S163J RS1/16S823J CAPACITORS CKSRYB331K50 CKSRYB331K50 CKSRYB331K50...

  • Page 28: Adjustment

    KEH-P4800,P4850 6. ADJUSTMENT - Connection Diagram BACK UP +14.4V DC Regulated Power Supply Lch + Lch - mV Meter (1) Oscilloscope Rch + Rch - Dummy Antenna Antenna Plug 50 (37.5 ) Stereo FM SSG Modulator 50 (75 ) FM/AM TUNER UNIT (TOP VIEW) Antenna Pin26 Jack...

  • Page 29

    KEH-P4800,P4850 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. FM ADJUSTMENT(UC MODEL) FM SSG Displayed...

  • Page 30: General Information, Parts, Display

    KEH-P4800,P4850 7. GENERAL INFORMATION 7.1 PARTS 7.1.1 IC CXA2559Q...

  • Page 31

    KEH-P4800,P4850 - Pin Functions(PD4973A) 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 KYDT Grille MicroComputer data input DPDT...

  • Page 32

    KEH-P4800,P4850 Pin No. Pin Name Format Function and Operation 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 Signal level input MODEL0 Model select input MODEL1...

  • Page 33

    KEH-P4800,P4850 - Pin Functions (PD6278A) 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 System reset System micro computer UART communication data output MODA...

  • Page 34

    KEH-P4800,P4850 7.1.2 DISPLAY - CAW1543...

  • Page 35: Block Diagram

    KEH-P4800,P4850 7.3 BLOCK DIAGRAM...

  • Page 36: Operations And Specifications

    KEH-P4800,P4850 8. OPERATIONS AND SPECIFICATIONS...

  • Page 37

    KEH-P4800,P4850 8.2. SPECIFICATIONS General FM tuner Power source ..14.4 V DC (10.8 – 15.1 V allowable) Frequency range(UCmodel) ....87.5 – 107.9 MHz Grounding system ........Negative type (ESmodel) ........87.5 – 108 MHz Max. current consumption ........8.5 A Usable sensitivity ............

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