Pioneer KEH-1940 Service Manual Download Page 24 | Manualshive

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KEH-1940,1960

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4.2 FM/AM TUNER UNIT

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FM/AM TUNER UNIT

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Summary of Contents for KEH-1940

Page 1: ...ASSETTE PLAYER WITH FM MW LW TUNER KEH 1940 X1M EW Service Manual CONTENTS 1 SAFETY INFORMATION 2 2 EXPLODED VIEWS AND PARTS LIST 2 3 BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 10 4 PCB CONNECTION DIAGRAM 20 5 ELECTRICAL PARTS LIST 28 6 ADJUSTMENT 32 7 GENERAL INFORMATION 34 7 1 DISASSEMBLY 34 7 2 PARTS 35 7 2 1 IC 35 7 2 2 DISPLAY 38 8 OPERATIONS AND SPECIFICATIONS 39 KEH 1960 X1M EW KEH 1940 X1M EW Thi...

Page 2: ...nicians 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 not risk trying to do so and r...

Page 3: ...5 E36 615 6 Polyethylene Bag CEG 162 CEG 162 7 Carton CHG3911 CHG3912 8 Contain Box CHL3911 CHG3912 9 Protector CHP1622 CHP1622 10 Protector CHP1623 CHP1623 11 Owner s Manual CRD3094 CRD3094 12 Installation Manual CRD3096 CRD3096 13 Passport CRY1013 CRY1013 14 Warranty Card CRY1157 CRY1157 15 Case Assy CXB3520 CXB3520 16 Cord Assy CDE6212 CDE6212 Owner s Manual Model Part No Language KEH 1940 X1M ...

Page 4: ...4 KEH 1940 1960 2 2 EXTERIOR ...

Page 5: ...K 29 Button EJECT See Contrast table 2 30 Button REW See Contrast table 2 31 Button FF See Contrast table 2 32 Button CROSS See Contrast table 2 33 Button TUNER BAND See Contrast table 2 34 Button 1 6 CAC6300 35 Button DETACH See Contrast table 2 36 Spring CBH1836 37 Spring CBH2307 38 Cover See Contrast table 2 39 Keyboard Unit See Contrast table 2 40 LCD LCD901 CAW1568 41 Connector CN901 CKS3580 ...

Page 6: ...XB4637 27 Detach Grille Assy CXB4671 CXB4672 29 Button EJECT CAC5870 CAC5871 30 Button REW CAC5872 CAC5873 31 Button FF CAC5874 CAC5875 32 Button CROSS CAC6295 CAC6296 33 Button TUNER BAND CAC6297 CAC6298 35 Button DETACH CAC6301 CAC6302 38 Cover CNS5696 CNS5697 39 Keyboard Unit CWM6745 CWM6746 47 Grille Unit CXB4631 CXB4632 57 Panel Unit CXB4924 CXB4925 58 Door CAT2109 CAT2108 60 Panel CNS5211 CN...

Page 7: ...7 KEH 1940 1960 ...

Page 8: ...8 KEH 1940 1960 2 3 CASSETTE MECHANISM ASSY ...

Page 9: ...NC1524 36 Frame ENC1440 37 Holder ENC1441 38 Lever ENC1446 39 Lever ENC1478 40 Belt ENT1027 41 Gear ENV1504 42 Gear ENV1470 43 Gear ENV1471 44 Lever ENV1472 45 Gear ENV1510 46 Gear ENV1475 47 Gear ENV1512 48 Gear ENV1513 49 Gear ENV1502 50 Lever ENV1480 51 Lever ENV1487 52 53 Arm ENV1519 54 PCB ENP1161 55 56 Switch FWD REV S3 ESH1006 57 Switch Load S1 ESN1016 58 Switch Mute S2 ESN1017 59 Head Assy...

Page 10: ... IL901 903 FM OSC Q201 Q202 FMTV AM OSC AMIFC VCO FM B AM B TUN B FMSD 25 26 19 20 15 17 21 14 13 6 7 9 18 41 9 10 14 15 17 19 47 1 2 19 43 40 28 30 31 25 23 18 16 36 32 38 6 34 Q3 FM RF T31 FM AM MIX Q31 CF51 FM AM IF CF52 FM IF CF53 FM IF T51 FMSL AMSL AMTV AMRF AGC CF232 AM IF FM AM PROCESSOR IC 1 PA4023B FM PROCESSOR IC 2 PA4024A TUN L FIX B A B C D KEYBOAR FM AM TUNER UNIT TUNER AMP UNIT CN30...

Page 11: ...ELECTRONIC VOLUME VDT VCK VST 2 3 3 IC 201 LA3161P CASSETTE EQUALIZER 1 B U FIX B 4 MUTE Q601 63 TAPLD 1 2 NOR REV MCMUT LOAD B U MECPW 50 Q809 Q810 MECPW MECHA POWER SWITCH MECHA MUTE Q602 SWVDD 18 VDD SWVDD 9 10 LCK LDT 4 3 5 6 CN602 ILL B SW5V SCK SIO 4 3 5 6 IC 901 PDC045A KEY LCD DRIVER RES SCK SO SI VDD 24 17 15 14 13 TRIX LCD 901 CAW1568 CN901 SYSTEM CONTROLLER IC 601 2 2 PE5107A MUTE SWITC...

Page 12: ... page Detailed page SYSTEM CONTROLLER EQ AMP ELECTRONIC VO TUNER AMP UNIT A FM AM TUNER UNIT B CASSETTE PCB D 73dBs AM 26 0dBs FM 16 0dBs A D 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 A a ...

Page 13: ...FUSE POWER AMP B REMOTE OLUME KEYBOARD UNIT C GND RL RR FR FL RL FL FR RR ANT UP BACK ACC 29 0dBs AM 0 9dBs FM 9 1dBs TAPE 3 9dBs TAPE 22 1dBs FM 100 35 1dBs AM 30 24 1dBs TAPE 315Hz 0dB 22 1dBs KEY LCD DRIVER 13 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 A A b C ...

Page 14: ...14 KEH 1940 1960 A 1 2 3 4 B C D 1 2 3 4 ELECTRONIC VOLUME TUNER AMP UNIT A FM AM TUNER UNIT B 29 0dBs AM 26 0dBs FM 16 0dBs A a A a A b 1 2 ...

Page 15: ...15 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 SYSTEM CONTROLLER EQ AMP CASSETTE PCB D 73dBs A a A a A b D 3 5 4 ...

Page 16: ...940 1960 A 1 2 3 4 B C D 1 2 3 4 600µH FUSE POWER AMP GND RL RR FR FL RL FL FR RR ANT UP BACK ACC AM 0 9dBs FM 9 1dBs TAPE 3 9dBs TAPE 22 1dBs FM 100 35 1dBs AM 30 24 1dBs TAPE 315Hz 0dB 22 1dBs A a A b A b 1 2 ...

Page 17: ...17 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 CEL 1547 1940 X1M EW CEL 1479 1960 X1M EW 14V 40mA B REMOTE KEYBOARD UNIT C KEY LCD DRIVER A b A a A b C 3 5 4 ...

Page 18: ...18 KEH 1940 1960 A 1 2 3 4 B C D 1 2 3 4 3 3 FM AM TUNER UNIT B 3 1 2 FM AM TUNER UN DSP 201M A11F B ...

Page 19: ...19 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 B R UNIT A ...

Page 20: ...UNER 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 2 Viewpoint of PCB diagrams Capacitor Connector P C Board Chip Part SIDE A SIDE B A ...

Page 21: ...21 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 A D B C CN1 CN901 SIDE A ...

Page 22: ...22 KEH 1940 1960 A 1 2 3 4 B C D 1 2 3 4 A A TUNER AMP UNIT ...

Page 23: ...23 KEH 1940 1960 5 6 7 8 A B C D 5 6 7 8 A SIDE B ...

Page 24: ...24 KEH 1940 1960 A 1 2 3 4 B C D 1 2 3 4 4 2 FM AM TUNER UNIT B SIDE A B FM AM TUNER UNIT A ...

Page 25: ...25 KEH 1940 1960 1 2 3 4 A B C D 1 2 3 4 B SIDE B B FM AM TUNER UNIT ...

Page 26: ...KEH 1940 1960 A 1 2 3 4 B C D 1 2 3 4 A CN602 TUNER BAND 1 2 3 4 5 6 S CLOCK BSM LOCAL 4 3 KEYBOARD UNIT C C KEYBOARD UNIT 26 SIDE B SIDE A C KEYBOARD UNIT ...

Page 27: ...1 3 5 7 9 2 4 6 8 10 CN1 S3 FWD REV SW S2 MUTE SW S1 LOAD SW M M1 MOTOR RR FR FL RL FWD REV PB HEAD HD1 A CN601 27 KEH 1940 1960 1 2 3 4 A B C D 1 2 3 4 D D CASSETTE PCB 4 4 CASSETTE PCB ...

Page 28: ...bers shown below indicate chip components Chip Resistor RS1 _S___J RS1 __S___J Chip Capacitor except for CQS CKS CCS CSZS Unit Number CWM6740 Unit Name Tuner Amp Unit MISCELLANEOUS IC 201 IC LA3161P IC 401 IC SN761029DL IC 501 IC TDA7384 IC 601 IC PE5107A IC 801 IC TPD1018F Q 301 Transistor 2SC1740S Q 302 Transistor 2SC1740S Q 303 Transistor 2SK330 Q 304 Transistor DTC124ES Q 501 Transistor DTC124...

Page 29: ...C 313 CKLSR473K16 C 314 CKSQYB102K50 C 315 4 7µF 16V CCH1250 C 316 CKSQYB103K50 C 317 CEJAR47M50 C 318 CKSQYB223K50 C 319 CKSQYB223K50 C 401 CKSQYB223K50 C 402 CKSQYB223K50 C 403 CEJA1R0M50 C 404 CEJA1R0M50 C 405 CEJA1R0M50 C 406 CEJA1R0M50 C 407 CEJA100M16 C 408 CEJA100M16 C 409 CKSQYB822K50 C 410 CKSQYB822K50 C 411 CEJA1R0M50 C 412 CEJA1R0M50 C 413 CKSQYB153K50 C 414 CKSQYB153K50 C 415 CKSQYB104...

Page 30: ...J R 56 RS1 16S823J R 61 RS1 16S392J R 62 RS1 16S393J R 101 RS1 16S272J R 102 RS1 16S682J R 103 RS1 16S333J R 104 RS1 16S334J R 105 RS1 16S683J R 107 RS1 16S222J R 151 RS1 16S222J R 152 RS1 16S393J R 154 RS1 16S104J R 155 RS1 16S273J R 156 RS1 16S243J R 157 RS1 16S203J R 160 RS1 16S222J R 161 RS1 16S563J R 162 RS1 16S105J R 163 RS1 16S222J R 202 RS1 16S223J R 203 RS1 16S225J R 204 RS1 16S103J R 206...

Page 31: ...CKSRYB332K50 C 236 CKSQYB473K16 C 237 CCSRCH120J50 C 239 CKSRYB472K50 C 240 CEJAR47M50 C 241 CKSQYB104K16 C 242 CEJAR47M50 C 243 CEJAR33M50 C 244 CKSQYB473K16 C 245 CKSRYB123K25 C 246 CKSQYB473K16 C 250 CCSRCH471J50 Unit Number CWM6745 KEH 1940 X1M EW CWM6746 KEH 1960 X1M EW Unit Name Keyboard Unit MISCELLANEOUS IC 901 IC PDC045A D 901 Diode MA153 D 902 Diode MA153 D 903 Diode MA110 IL 901 Lamp 14...

Page 32: ...DC Regulated Power Supply TUNER AMP UNIT 50Ω 75Ω FM SSG Stereo Modulator 50Ω 37 5Ω Antenna Plug Dummy Antenna FM AM TUNER UNIT TOP VIEW T31 T51 C63 T51 Center Meter FM AM TUNER UNIT BOTTOM VIEW Pin1 Pin13 Pin14 Pin 19 Pin26 L2 L4 L5 VR154 TC1 DC V Meter 1 32 KEH 1940 1960 6 ADJUSTMENT Connection Diagram ...

Page 33: ...yed Adjustment Adjustment Method No Frequency MHz Level dBf Frequency MHz Point Switch Position TUN Volt 1 108 0 L5 DC V Meter 1 6V IF 2 98 1 M 60 100 98 1 T51 Center Meter 0 ANT Coil 3 98 1 M 5 98 1 L2 mV Meter 1 Maximum RF Coil 4 98 1 M 5 98 1 L4 mV Meter 1 Maximum RF 5 129 3 M 60 80 107 9 TC1 mV Meter 1 Minimum Trimmer 6 RF Coil and RF Trimmer shall be adjusted twice or more IFT 7 98 1 M 5 98 1...

Page 34: ...raight Remove the Tuner Amp Unit Remove the Case not shown 1 Remove the three screws 2 Remove the Case Remove the Cassette Mechanism Assy not shown 1 Remove the four screws 2 Disconnect the connector and then remove the Cassette Mechanism Assy Remove the Panel Unit Fig 1 Disengage the stopper at two locations indicated by arrow Remove the Panel Unit Fig 1 Fig 2 Panel Unit Tuner Amp Unit Cassette M...

Page 35: ...IN4 L AGND AGND SWout R SWout L ZCin R ZCin L LOUD R LOUD L VRin R VRin L TREB R TREB L BASS C1 R BASS C1 L BASS R R BASS R L BASS C2 R BASS C2 L NC NC TONEout R TONEout L FADERin R FADERin L FRNTout R FRNTout L REARout R REARout L DVcc VREFin DATA AGND CLK DGND STB Ct 3 Line Serial Bus Bass Treble Volume Loudness Fader Gain Adjust Isolator Zero cross Detector Power Supply Bass Treble Volume Loudn...

Page 36: ...e 21 VCK O C Clock output for electronic volume 22 VDT O C Data output for electronic volume 23 NC Not used 24 XO O Crystal oscillator connection pin 25 XI I Crystal oscillator connection pin 26 GND GND 27 30 NC Not used 31 TEST I Test program mode input 32 dsens I Grille detach sense input 33 34 GND GND 35 38 NC Not used 39 mute O C System mute output 40 DMINH O C Mechanism mute cancel output 41 ...

Page 37: ...mote control reception 17 RES I Reset input 18 TEST I Test input 19 OSC IN I System clock input 20 OSC OUT O System clock output 21 GND GND 22 23 VDD2 1 LCD power supply 24 VDD Power supply 25 28 COM1 4 O LCD common signal 29 42 SEG1 14 O LCD segment signal 43 48 NC Not used 12 13 24 25 36 37 48 1 PDC045A IC s marked by are MOS type Be careful in handling them because they are very liable to be da...

Page 38: ...38 KEH 1940 1960 7 2 2 DISPLAY CAW1568 SEGMENT COMMON ...

Page 39: ...duct is connected to terminal 5 check the function of the terminal 5 Back up or Accessory beforehand 4 11 ISO connector Note In some vehicles the ISO connector may be divided into two If this is the case be sure to connect to both connectors 12 Speaker leads White Front left White black Front left Gray Front right Gray black Front right Green Rear left Green black Rear left Violet Rear right Viole...

Page 40: ... before you can listen to music Note Loading a cassette in this product 1 Press the TUNER button to switch the Tuner ON OFF Note You cannot switch to the Tuner when a tape is loaded You cannot switch to the Cassette Player when a tape is not loaded When this product s blue white lead is connected to the car s Auto antenna relay control terminal the car s Auto antenna extends when this product s po...

Page 41: ...ed in memory Preset Number Indicator Band FI FM1 FII FM2 FIII FM3 M L MW LW Band Indicator Frequency Indicator Basic Operation of Cassette Player Direction Change To change the direction press the 1 and buttons at the same time Eject The power of this product turns OFF when you eject a tape with the EJECT button When you listen to the Tuner before a tape is set to this product the source switches ...

Page 42: ...ec Fast forward rewinding time Approx 90 sec for C 60 Wow flutter 0 13 WRMS Frequency response 40 14 000 Hz 3 dB Stereo separation 45 dB Signal to noise ratio 52 dB IEC A network FM tuner Frequency range 87 5 108 MHz Usable sensitivity 11 dBf 1 0 µV 75 Ω mono S N 30 dB 50 dB quieting sensitivity 16 dBf 1 7 µV 75 Ω mono Signal to noise ratio 70 dB IEC A network Distortion 0 3 at 65 dBf 1 kHz stereo...

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