Pioneer KEH-3950 Service Manual
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Pioneer KEH-3950 Service Manual

High power cassette player with fm/am tuner
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Service
Manual
HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER
KEH-3950
HIGH POWER CASSETTE PLAYER WITH FM/MW/LW TUNER
KEH-3910
- This service manual should be used together with the following manual(s):
Model No.
Order No.
CX-1011
CRT2406
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST .......................2
4. PCB CONNECTION DIAGRAM ................................26
5. ELECTRICAL PARTS LIST ........................................36
6. ADJUSTMENT..........................................................43
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
KEH-3950/X1M/ES
1
X
M/EE
Mech. Module Remarks
3L
Cassette Mech. Module:Circuit Description, Mech.Description, Disassembly
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
X
7. GENERAL INFORMATION .......................................44
7.1 DISASSEMBLY ...................................................44
7.2 PARTS .................................................................45
7.2.1 IC................................................................45
7.2.2 DISPLAY ....................................................49
8. OPERATIONS AND SPECIFICATIONS.....................50
K-ZZD. NOV. 1999 Printed in Japan
ORDER NO.
CRT2421
1
M/ES

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  • 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 CORPORATION 1999 K-ZZD. NOV. 1999 Printed in Japan...

  • Page 2: Safety Information

    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. 2. EXPLODED VIEWS AND PARTS LIST 2.1 PACKING(KEH-3950/X1M/ES) NOTE: - Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.
  • Page 3 KEH-3950,3910 - Owner's Manual, Installation Manual Model Part No. Language KEH-3950/X1M/ES CRD3119 English, Spanish, Portuguese(B), CRD3121 Chinese, Arabic 2.2 PACKING(KEH-3910/X1M/EE) - PACKING SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Cord Assy CDE6222 11 Protector...
  • Page 4 KEH-3950,3910 2.3 EXTERIOR(KEH-3950/X1M/ES)
  • Page 5 KEH-3950,3910 - EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ26P050FMC 36 Button(SELECT) CAC6276 2 Screw BSZ30P050FMC 37 Button(SOURCE/LOUD) CAC6495 3 Screw BSZ30P200FMC 38 Spring CBH2210 4 Cord Assy CDE6222 39 Cover CNS5661 5 •••••...
  • Page 6 KEH-3950,3910 2.4 EXTERIOR(KEH-3910/X1M/EE)
  • Page 7 KEH-3950,3910 - EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ26P050FMC 31 Screw BPZ20P100FZK 2 Screw BSZ30P050FMC 32 Button(DETACH) CAC5789 3 Screw BSZ30P200FMC 33 Button(1-6) CAC6275 4 Cord Assy CDE6222 34 Button(EJECT) CAC6277 5 •••••...
  • Page 8 KEH-3950,3910 2.5 CASSETTE MECHANISM MODULE...
  • Page 9 KEH-3950,3910 - 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 10: Block Diagram And Schematic Diagram

    KEH-3950,3910 3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 3.1 BLOCK DIAGRAM(KEH-3950/X1M/ES) TUNER AMP UNIT FM/AM TUNER UNIT FM FRONT END FM/AM 1ST IF 10.7MHz FM MPX T51 Q51 CF51 CF52 CF53 CN401 ANTENNA TUNER Lch JACK IC 2 PM4008A Q903 34 33 41 44 11 12 13 COMP MIXER.IF AMP DET...
  • Page 11 KEH-3950,3910 3.2 BLOCK DIAGRAM(KEH-3910/X1M/EE) TUNER AMP UNIT FM/AM TUNER UNIT FM FRONT END FM/AM 1ST IF 10.7MHz FM MPX T51 Q51 CF51 CF52 CF53 CN401 ANTENNA TUNER Lch JACK IC 2 PM4008A Q903 34 33 41 44 11 12 13 COMP MIXER.IF AMP DET...
  • Page 12 3.3 OVERALL CONNECTION DIAGRAM(GUIDE PAGE) Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS LIST”. TUNER AMP UNIT ANTENNA JACK Large size SCH diagram KEH-3950/X1M/ES KEH-3910/X1M/EE C462,463 FM/AM TUNER UNIT R460,461 SOUR R464,465 ELECT FM(100%)(ES) : -19.5dBs...
  • Page 13 KEH-3950,3910 RCE SELECTOR/ TRONIC VOLUME ES): -19.5dBs EE): -15.5dBs (ES) : -30.0dBs KEH-3950/X1M/ES (EE) : -26.0dBs PE : -7.9dBs R-CH REAR PREOUT L-CH TAPE(ES) : -4.2dBs POWER AMP FM(ES) : 31.5dBs FM(EE) : 33.5dBs AM(ES) : 21.0dBs AM(EE) : 25.0dBs TAPE : 23.1dBs...
  • Page 14 KEH-3950,3910...
  • Page 15 KEH-3950,3910...
  • Page 16 KEH-3950,3910...
  • Page 17 KEH-3950,3910...
  • Page 18 KEH-3950,3910 3.4 FM/AM TUNER UNIT(KEH-3950/X1M/ES) FM/AM TUNER UNIT Mark Band Input Level None – – 0dBf 65dBf F125 125dBf 0dBµ 74dBµ A125 125dBµ...
  • Page 19 KEH-3950,3910...
  • Page 20 KEH-3950,3910 3.5 FM/AM TUNER UNIT(KEH-3910/X1M/EE) FM/AM TUNER UNIT R901 4R7K Mark Band Input Level None – – 0dBf 65dBf F125 125dBf 0dBµ 74dBµ A125 125dBµ...
  • Page 21 KEH-3950,3910 R910 0R0...
  • Page 22 KEH-3950,3910 3.6 KEYBOARD UNIT KEYBOARD UNIT PD6293A LCD DRIVER, KEY CONTROLLER CAW1560...
  • Page 23 KEH-3950,3910 LOUD LOCAL IL1801-1804 : CEL1547(14V 40mA)
  • Page 24 KEH-3950,3910 3.7 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 TAPESW PBGND Fwd-R R282 0R0 R274 PBFIN2 MUTESW C273...
  • Page 25 KEH-3950,3910 M1 MOTOR UNIT (MAIN MOTOR) EXA1491 CN255 CN256 REEL SENSE CN253 EGN1 EGN1004 R373 MODE ESG1007 load S1 LOAD ESG1007 R290 REEL SENSE C403 R068 R403 82K CN254 C402 R402 18K 3900P C401 R401 4R7K MOTOR UNIT (SUB MOTOR)

  • Page 26: Pcb Connection Diagram

    KEH-3950,3910 4. PCB CONNECTION DIAGRAM 4.1 TUNER AMP UNIT CORD ASSY 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 dia- gram.
  • Page 27 KEH-3950,3910 SIDE A CORD ANTENNA JACK REAR PREOUT L-CH R-CH CN251...
  • Page 28 KEH-3950,3910 TUNER AMP UNIT...
  • Page 29 KEH-3950,3910 SIDE B...
  • Page 30 KEH-3950,3910 4.2 FM/AM TUNER UNIT SIDE A...
  • Page 31 KEH-3950,3910 SIDE B...
  • Page 32 KEH-3950,3910 4.3 KEYBOARD UNIT SIDE A ←...
  • Page 33 KEH-3950,3910 SIDE B...
  • Page 34 KEH-3950,3910 4.4 CASSETTE MECHANISM MODULE SIDE A DECK UNIT CN602 DECK UNIT SIDE B HEAD ASSY IC,Q VR302 CN254 CN255 CN253 CN252 IC253 IC251 Q351 Q352 VR301 CN256...
  • Page 35 KEH-3950,3910 REEL SENSE PCB LOAD SW 70µs SW MODE SW CN256 CN253 EGN1 REEL SENSE...

  • Page 36: Electrical Parts List

    KEH-3950,3910 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 37 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RD1/4PU473J CKSQYB225K10 RS1/10S682J CEJA1R0M50 RAB4C473J CKSYB225K16 RD1/4PU473J CEJA100M16 RD1/4PU103J CFTNA224J50 RS1/10S473J CFTNA224J50 RAB4C102J CFTNA224J50 RD1/4PU102J CFTNA224J50 RD1/4PU102J CKSQYB104K16 RD1/4PU102J 3300µF/16V...
  • Page 38 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Inductor LCTB330K1608 RS1/16S473J Inductor CTF1287 RS1/16S103J Inductor LCTA121J3225 RS1/16S681J Coil CTC1154 RS1/16S473J Inductor LCTA3R3J3225 RS1/16S562J CAPACITORS Inductor LCTBR47K1608 Inductor...
  • Page 39 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CKSRYB103K50 Transistor 2SC2412K CCSRCH101J50 Transistor DTC124EK CKSRYB223K25 Transistor 2SC2412K CKSQYB334K16 Transistor 2SC2412K CKSRYB103K50 Transistor 2SA1037K CKSQYB105K10 Transistor 2SC2412K CKSRYB104K16...
  • Page 40 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S681J RD1/4PU103J RS1/10S103J RD1/4PU102J RS1/10S681J RD1/4PU152J RD1/4PU473J RD1/4PU153J RS1/10S472J RD1/4PU472J RS1/10S473J RD1/4PU473J RS1/10S473J RD1/4PU102J RS1/10S473J RD1/4PU473J RD1/4PU473J CAPACITORS RD1/4PU473J...
  • Page 41 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CEJA101M10 RS1/16S471J CKSQYB473K50 RS1/16S223J 470µF/16V CCH1183 RS1/16S221J CKSQYB103K50 RS1/16S221J 330µF/10V CCH1181 RS1/16S473J CKSQYB103K50 RS1/16S470J 100µF/16V CCH1179 RS1/16S103J CKSQYB103K50 RS1/16S103J...
  • Page 42 KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CCSRCH4R0C50 CKSRYB104K16 CCSRCH270J50 CKSRYB473K16 CKSRYB103K50 CKSQYB334K16 CCSRCH100D50 CKSQYB474K16 CKSRYB222K50 CKSRYB104K16 CKSRYB103K50 CKSRYB272K50 CKSRYB103K50 CKSRYB682K25 CKSRYB103K50 CCSRCH560J50 CKSQYB334K16 CCSRCH270J50 CKSRYB472K50...

  • Page 43: Adjustment

    KEH-3950,3910 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/16S102J Unit Number : RS1/10S274J Unit Name : REEL SENSE PCB RS1/8S301J RS1/8S0R0J Switch(LOAD) ESG1007 RS1/8S0R0J Switch(MODE) ESG1007 Photo-reflector...

  • Page 44: General Information

    KEH-3950,3910 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 45: Parts

    KEH-3950,3910 7.2 PARTS 7.2.1 IC - Pin Functions (PE5089A) Pin No. Pin Name Format Function and Operation Not used ADPW A/D converter power supply output AVSS swvdd Grille power supply control output FM stereo input AVREF1 Connected to 5V line...
  • Page 46 KEH-3950,3910 Pin No. Pin Name Format Function and Operation RDS clock input dsens Grille detach sense input TELIN Telephone mute input asens ACC power sense input bsens Back up power sense input Not used Oscillator output Oscillator input Connect to GND...
  • Page 47 KEH-3950,3910 - Pin Functions (PD6293A) Pin No. Pin Name Function and Operation SEG4-0 LCD segment output COM3-0 LCD common output VLCD LCD drive power supply 11-14 KST3-0 Key strobe output 15,16 KDT0,1 Key data input (analogue input) Remote control reception...
  • Page 48 KEH-3950,3910 S-80834ANY BR9010FV : Chip select input : Serial data clock input : Serial data input : Serial data output : Write control input...

  • Page 49: Display

    KEH-3950,3910 7.2.2 DISPLAY - CAW1560...

  • Page 50: Operations And Specifications

    KEH-3950,3910 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS 5/∞/2/3 EJECT button SOURCE/OFF button buttons Cassette door BAND button Buttons 1–6 AUDIO button LOUD button Detach button +/– button LOCAL button BSM button CLOCK button...
  • Page 51 KEH-3950,3910...
  • Page 52 KEH-3950,3910...
  • Page 53 KEH-3950,3910...
  • Page 54 KEH-3950,3910...
  • Page 55 KEH-3950,3910...
  • Page 56 KEH-3950,3910 8.2 SPECIFICATIONS - KEH-3950/X1M/ES 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.
  • Page 57 KEH-3950,3910 - KEH-3910/X1M/EE General FM tuner Power source ..14.4 V DC (10.8 – 15.1 V allowable) Frequency range ..........65 – 74 MHz Grounding system ........Negative type 87.5 – 108 MHz Max. current consumption ........8.5 A Usable sensitivity ....

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Keh-3910

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