Pioneer KEH-P490 Service Manual

Multi-cd control high power cassette player with fm/am tuner

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Operation manual (56 pages)

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Service

Manual

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

KEH-P490

KEH-P4900

KEH-P4950

- This service manual should be used together with the following manual(s):

Model No.

Order No. Mech. Module Remarks

CX-1011

CRT2406

KEH-P490/X1M/UC

CRT2398

KEH-P4900/X1M/UC

CRT2398

KEH-P4950/X1M/ES

CRT2398

PIONEER CORPORATION

PIONEER ELECTRONICS SERVICE INC.

PIONEER ELECTRONIC [EUROPE] N.V.

PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936

C PIONEER CORPORATION 1999

Cassette Mech. Module : Mechanism Description

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

X1N/UC

X1N/ES

Disassembly ,Adjustment

K-ZZB. DEC. 1999 Printed in Japan

ORDER NO.

CRT2404

X1N/UC

Table of Contents

Summary of Contents for Pioneer KEH-P490

Page 1 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...
Page 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 Carton CHG3893 CHG3905 Contain Box CHL3893 CHL3905 Protector CHP2244 CHP2252 Protector CHP2243 CHP2251 Part No. Mark No. Description KEH-P4900/X1M/UC...
Page 3 KEH-P490,P4900,P4950 PCB CONNECTION DIAGRAM CASSETTE MECHANISM MODULE CN602 DECK UNIT SIDE A DECK UNIT HEAD ASSY SIDE B IC,Q VR302 CN254 CN255 CN253 CN252 IC253 IC251 Q351 Q352 VR301 CN256 REEL SENSE UNIT LOAD SW 70µs SW MODE SW CN256...
Page 4 KEH-P490,P4900,P4950 DECK UNIT CN252 C256 R258 C253 330P Rev-L R283 0R0 R256 220 R273 C254 330P Rev-R PBFB2 MSMODE R284 0R0 R272 DRSW PBRIN2 R290 R271 IC251 TAPESW PBGND Fwd-R R282 0R0 R274 MUTESW PBFIN2 C273 C252 330P R287 CXA2559Q...
Page 5 KEH-P490,P4900,P4950 M1 MOTOR UNIT (MAIN MOTOR) EXA1491 CN255 CN256 REEL SENSE CN253 EGN1 EGN1004 R373 MODE ESG1007 MECHANISM DRIVER load S1 LOAD ESG1007 R290 REEL SENSE C403 R068 R403 82K CN254 C402 R402 18K 3900P C401 R401 4R7K MOTOR UNIT...
Page 6 KEH-P490,P4900,P4950 CASSETTE MECHANISM MODULE...
Page 7 KEH-P490,P4900,P4950 - CASSETTE MECHANISM MODULE SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ20P040FMC 46 Pinch Roller ENV1518 2 Washer CBF1037 47 Pinch Holder Unit EXA1583 3 Washer CBG1003 48 Pinch Roller ENV1518...
Page 8: 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 CORPORATION 1999 K-ZZB. OCT. 1999 Printed in Japan...
Page 9: Safety Information
KEH-P490,P4900,P4950 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.
Page 10 KEH-P490,P4900,P4950 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 Part No.
Page 11 KEH-P490,P4900,P4950 2.2 EXTERIOR...
Page 12 See Contrast table(2) Cassette Mechanism Module 34 Button CAC4836 69 Screw ISS26P055FUC 35 Spring CBH1834 (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 Tuner Amp Unit...
Page 13 KEH-P490,P4900,P4950 2.3 CASSETTE MECHANISM MODULE...
Page 14 KEH-P490,P4900,P4950 - CASSETTE MECHANISM MODULE SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ20P040FMC 46 Pinch Roller ENV1518 2 Washer CBF1037 47 Pinch Holder Unit EXA1583 3 Washer CBG1003 48 Pinch Roller ENV1518...
Page 15 KEH-P490,P4900,P4950...
Page 16: Block Diagram And Schematic Diagram
KEH-P490,P4900,P4950 3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 3.1 BLOCK DIAGRAM TUNER AMP UNIT FM/AM TUNER UNIT Q31 CF51 CF52 CF53 CN402 FM RF FM MIX FM IF FM IF FM IF FM/AM TUNER Lch ANTENNA Q903 FM/AM PROCESSOR FM PROCESSOR...
Page 17 KEH-P490,P4900,P4950 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”. Large size SCH diagram FM/AM TUNER UNIT Guide page Detailed page KEYBOARD UNIT...
Page 18 KEH-P490,P4900,P4950 TUNER AMP UNIT CEK1136...
Page 19 KEH-P490,P4900,P4950...
Page 20 KEH-P490,P4900,P4950...
Page 21 KEH-P490,P4900,P4950...
Page 22 KEH-P490,P4900,P4950...
Page 23 KEH-P490,P4900,P4950 3.3 FM/AM TUNER UNIT - CWE1467(KEH-P490/X1M/UC, KEH-P4900/X1M/UC) FM/AM TUNER UN...
Page 24 KEH-P490,P4900,P4950 ER UNIT...
Page 25 KEH-P490,P4900,P4950 - CWE1486(KEH-P4950/X1M/ES) FM/AM TUNER UN...
Page 26 KEH-P490,P4900,P4950 R UNIT...
Page 27 KEH-P490,P4900,P4950 3.4 KEYBOARD UNIT...
Page 28 KEH-P490,P4900,P4950 KEYBOARD UNIT DISP CLOCK PAUSE/BSM...
Page 29 KEH-P490,P4900,P4950 3.5 CASSETTE MECHANISM MODULE DECK UNIT CN252 C256 R258 C253 330P Rev-L R283 0R0 R256 220 R273 C254 330P Rev-R MSMODE PBFB2 R284 0R0 R272 DRSW PBRIN2 R290 R271 IC251 PBGND TAPESW Fwd-R R282 0R0 R274 MUTESW PBFIN2 C273...
Page 30 KEH-P490,P4900,P4950 M1 MOTOR UNIT (MAIN MOTOR) EXA1491 CN255 CN256 REEL SENSE CN253 EGN1 EGN1004 R373 MODE ESG1007 MECHANISM DRIVER load S1 LOAD ESG1007 R290 REEL SENSE C403 R068 R403 82K CN254 C402 R402 18K 3900P C401 R401 4R7K MOTOR UNIT...
Page 31: Pcb Connection Diagram
KEH-P490,P4900,P4950 4. PCB CONNECTION DIAGRAM 4.1 TUNER AMP UNIT CORD ASSY 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 dia- gram.
Page 32 KEH-P490,P4900,P4950 SIDE A IP-BUS ANTENNA CN251...
Page 33 KEH-P490,P4900,P4950 TUNER AMP UNIT...
Page 34 KEH-P490,P4900,P4950 SIDE B...
Page 35 KEH-P490,P4900,P4950 4.2 FM/AM TUNER UNIT SIDE A...
Page 36 KEH-P490,P4900,P4950 SIDE B...
Page 37 KEH-P490,P4900,P4950 4.3 KEYBOARD UNIT SIDE A SIDE B...
Page 38 KEH-P490,P4900,P4950 4.4 CASSETTE MECHANISM MODULE DECK UNIT CN602 SIDE A SIDE B DECK UNIT HEAD ASSY IC,Q VR302 CN254 CN255 CN253 CN252 IC253 IC251 Q351 Q352 VR301 CN256...
Page 39 KEH-P490,P4900,P4950 REEL SENSE PCB LOAD SW 70µs SW MODE SW CN256 EGN1 CN253 REEL SENSE...
Page 40: Electrical Parts List
KEH-P490,P4900,P4950 5. ELECTRICAL PARTS LIST NOTES: - 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 41 KEH-P490,P4900,P4950 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S102J RD1/4PU472J RS1/8S0R0J RS1/10S222J RS1/10S562J RS1/10S473J RS1/10S473J RS1/10S223J RS1/10S152J RS1/10S223J RS1/10S472J RS1/10S473J RS1/10S472J RD1/4PU102J RS1/10S472J RD1/4PU473J RS1/10S0R0J RS1/10S473J RS1/10S103J...
Page 42 CKSQYB103K50 CKSQYB473K50 CEJA220M6R3 CKSQYB103K50 CKSQYB103K50 4.7µF/16V CCH1250 CKLSR473K16 CKSQYB154K16 CONTRAST TABLE of TUNER AMP UNIT KEH-P490/X1M/UC, KEH-P4900/X1M/UC and KEH-P4950/X1M/ES are constructed same except for the following: Part No. KEH-P490/X1M/UC KEH-P4950/X1M/ES Symbol and Description KEH-P4900/X1M/UC FM/AM Tuner Unit CWE1467 CWE1486 L401...
Page 43 KEH-P490,P4900,P4950 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Radiator 918.5Hz CSS1365 CAPACITORS Crystal Resonator 10.26MHz CSS1111 Semi-fixed 150kΩ(B) CCP1213 CCSQCH6R0D50 CCSRCK2R0C50 RESISTORS CCSRCH820J50 CCSRCH820J50 RS1/16S225J CKSRYB103K25 RS1/16S225J...
Page 44 KEH-P490,P4900,P4950 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CCSRCH560J50 Ceramic Filter CTF1348 CKSQYB104K16 Radiator 918.5Hz CSS1365 CCSRCH101J50 Crystal Resonator 10.26MHz CSS1111 CEJA470M6R3 Semi-fixed 150kΩ(B) CCP1213 CKSRYB103K25 RESISTORS...
Page 45 Unit Number : CWM7024 (KEH-P4900/X1M/UC) (KEH-P4950/X1M/ES) CKSQYB104K16 Unit Name : Keyboard Unit CCSRRH201J50 CKSRYB223K25 MISCELLANEOUS CKSRYB103K25 CCSRCH470J50 IC 1901 PD6278C IC 1902 HIC Module(KEH-P490/X1M/UC) RS-140 CKSQYB223K25 1901 Chip Diode MA151WK CKSQYB104K16 1902 Chip Diode MA151WA CKSRYB472K50 1901 Ceramic Resonator 4.97MHz CSS1422...
Page 46 KEH-P490,P4900,P4950 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RESISTORS CAPACITORS 1901 RS1/10S222J CKSRYB331K50 1902 RS1/10S222J CKSRYB331K50 1903 RS1/10S472J CKSRYB331K50 1904 RS1/10S473J CKSRYB331K50 1905 RS1/10S473J CKSRYB103K50 1906 RS1/10S473J...
Page 47: Adjustment
KEH-P490,P4900,P4950 6. ADJUSTMENT - Connection Diagram BACK UP +14.4V DC Regulated Power Supply Lch + Ω Lch - mV Meter (1) Oscilloscope Rch + Ω Rch - Dummy Antenna Antenna Plug Ω (37.5 Ω Stereo FM SSG Modulator Ω Ω...
Page 48 KEH-P490,P4900,P4950 FM ADJUSTMENT (UC MODEL) 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 49: General Information
KEH-P490,P4900,P4950 7. GENERAL INFORMATION 7.1 DISASSEMBLY Cassette Mechanism Module Remove the Case(not shown) 1. Remove the two screws. 2. Remove the Case. Remove the Cassette Mechanism Module (not shown) 1. Remove the four screws. 2.Disconnect the connector, and then remove the Cassette Mechanism Module.
Page 50: Parts
KEH-P490,P4900,P4950 7.2 PARTS 7.2.1 IC CXA2559Q PML003AM Rear- Loud- Front- IN1_R IN2_R IN3_R IN4+_R IN4-_R AGND out_R SVin_R out_R out_R FIE_R DATA Isolator circuit Anti radiation Fader Secondary Anti Alias filter volume volume filter Loudness volume Primary Treble Zero cross...
Page 51 KEH-P490,P4900,P4950 - Pin Functions(PE5086A) Pin No. Pin Name Format Function and Operation ASENBO Slave power supply control output Not used ADPW A/D converter power AVSS swvdd Grille power supply control output FM stereo input AVREF1 D/A converter standard voltage KYDT...
Page 52 KEH-P490,P4900,P4950 Pin No. Pin Name Format Function and Operation Not used TESTIN Test program mode input AVDD A/D converter analog power supply (VDD) AVREF0 A/D converter standard voltage input Signal level input 77,78 MODEL2,1 Model select input 79,80 Not used...
Page 53 KEH-P490,P4900,P4950 - 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 54: Display
KEH-P490,P4900,P4950 7.2.2 DISPLAY - CAW1563...
Page 55: Operations And Specifications
KEH-P490,P4900,P4950 8. OPERATIONS AND SPECIFICATIONS - Connection Diagram (KEH-P490/X1M/UC)
Page 56 KEH-P490,P4900,P4950 - Connection Diagram (KEH-P4900/X1M/UC)
Page 57 KEH-P490,P4900,P4950 - Connection Diagram (KEH-P4950/X1M/ES)
Page 58 KEH-P490,P4900,P4950 8.1 OPERATIONS (KEH-P490/X1M/UC) PAUSE/BSM button BAND button 5/∞/2/3 EJECT button EQ button buttons Cassette door Detach button Buttons 1–6 DISPLAY button SOURCE/OFF button CLOCK button AUDIO button RPT button +/– button KEH-P490/X1M/UC ONLY +/– button AUDIO button PAUSE button Press once to 5/∞/2/3 buttons...
Page 59 KEH-P490,P4900,P4950...
Page 60 KEH-P490,P4900,P4950...
Page 61 (1.0 µV/75 Ω, mono, S/N: 30 dB) Max. current consumption ........8.5 A 50 dB quieting sensitivity ..16 dBf (1.7 µV/75 Ω, mono) Dimensions (KEH-P490/X1M/UC, KEH-P4900/X1M/UC) (DIN) (chassis) ..178 (W) × 50 (H) × 155 (D) mm Signal-to-noise ratio ...... 70 dB (IHF-A network) [7 (W) ×...

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Keh-p490x1n/uc Keh-p4900 Keh-p4900x1n/uc Keh-p4950 Keh-p4950x1n/es

Pioneer KEH-P490 Service Manual

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