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Pioneer Lexus SC400 Service Manual
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Pioneer Lexus SC400 Service Manual

Audio system head unit
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S
ervice
M anua l
AUDIO SYSTEM
HEAD UNIT
VEHICLE
DESTINATION
LEXUS SC400
U.S.A.,CANADA
LEXUS SC300
Manufactured for TOYOTA
by PIONEER ELECTRONIC CORPORATION
SC400
SC300
PRODUCED AFTER
ID No.
August 1998
P6807
TOYOTA PART No.
PIONEER MODEL No.
KEX-M8886ZT/UC
86120-24350
KEX-M8886ZT-91/UC
PUB. NO.
ORDER NO.
CRT2222
CRT2222

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  • Page 1 CRT2222 SC400 SC300 AUDIO SYSTEM HEAD UNIT VEHICLE DESTINATION PRODUCED AFTER ID No. TOYOTA PART No. PIONEER MODEL No. LEXUS SC400 KEX-M8886ZT/UC U.S.A.,CANADA August 1998 P6807 86120-24350 LEXUS SC300 KEX-M8886ZT-91/UC Manufactured for TOYOTA CRT2222 by PIONEER ELECTRONIC CORPORATION PUB. NO.

  • Page 2: Table Of Contents

    KEX-M8886ZT ,M8886ZT-91 PREMIUM SOUND SYSTEM P6807 FM1/2 TAPE SCAN PROG B•C SKIP SCAN TUNE SCAN DISC FAST RANDOM SEEK TRACK BASS TREB FADE - Supplementary model is identical to the original except for the addition of following items. Description Part No. KEX-M8886ZT-91/UC Polyethylene Bag CEG1026...

  • Page 3: Safety Information

    KEX-M8886ZT ,M8886ZT-91 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 4: Exploded Views And Parts List

    KEX-M8886ZT ,M8886ZT-91 2. EXPLODED VIEWS AND PARTS LIST 2.1 EXTERIOR...
  • Page 5 KEX-M8886ZT ,M8886ZT-91 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 - EXTERIOR SECTION PARTS LIST Mark No. Description Part No.
  • Page 6 KEX-M8886ZT ,M8886ZT-91 2.2 CASSETTE MECHANISM MODULE...
  • Page 7 KEX-M8886ZT ,M8886ZT-91 - CASSETTE MECHANISM MODULE SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ20P040FMC 46 Pinch Roller Unit EXA1473 2 Washer CBF1037 47 Reel Unit EXA1484 3 Washer CBF1038 48 Head Base Unit EXA1434 4 Washer CBG1003...

  • Page 8: Schematic Diagram

    KEX-M8886ZT ,M8886ZT-91 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 SCH diagram Guide page Detailed page FM EMITTER FOLLOWER...
  • Page 9 KEX-M8886ZT ,M8886ZT-91 HA12187FP...
  • Page 10 KEX-M8886ZT ,M8886ZT-91...
  • Page 11 KEX-M8886ZT ,M8886ZT-91...
  • Page 12 KEX-M8886ZT ,M8886ZT-91...
  • Page 13 KEX-M8886ZT ,M8886ZT-91...
  • Page 14 KEX-M8886ZT ,M8886ZT-91 3.2 FM/AM TUNER UNIT FM/AM TUNER UNIT...
  • Page 15 KEX-M8886ZT ,M8886ZT-91...
  • Page 16 KEX-M8886ZT ,M8886ZT-91 3.3 CASSETTE MECHANISM MODULE CN601...
  • Page 17 KEX-M8886ZT ,M8886ZT-91...

  • Page 18: Pcb Connection Diagram

    KEX-M8886ZT ,M8886ZT-91 4. PCB CONNECTION DIAGRAM MAIN UNIT 4.1 MAIN 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 19 KEX-M8886ZT ,M8886ZT-91 SIDE A CN251 CN902 CN901...
  • Page 20 KEX-M8886ZT ,M8886ZT-91 MAIN UNIT...
  • Page 21 KEX-M8886ZT ,M8886ZT-91 SIDE B...
  • Page 22 KEX-M8886ZT ,M8886ZT-91 4.2 FM/AM TUNER UNIT SIDE A...
  • Page 23 KEX-M8886ZT ,M8886ZT-91 SIDE B...

  • Page 24: Keyboard Unit

    KEX-M8886ZT ,M8886ZT-91 4.3 KEYBOARD UNIT SIDE A...
  • Page 25 KEX-M8886ZT ,M8886ZT-91 SIDE B...
  • Page 26 KEX-M8886ZT ,M8886ZT-91 4.4 VOLUME ASSY SIDE A SIDE B...
  • Page 27 KEX-M8886ZT ,M8886ZT-91 4.5 CASSETTE MECHANISM MODULE...
  • Page 28 KEX-M8886ZT ,M8886ZT-91 PCB UNIT SIDE A PCB UNIT SIDE B REEL PCB...

  • Page 29: Electrical Parts List

    KEX-M8886ZT ,M8886ZT-91 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 30 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- RS1/16S471J CKSRYB103K25 RS1/16S220J CKSRYB562K25 RS1/16S101J CKSQYB104K16 RS1/16S102J CEJA3R3M50 RS1/16S563J CKSQYB104K16 RS1/16S393J CEJA3R3M50 RS1/16S0R0J CKSYB474K16 RS1/16S242J CEJA220M6R3 RS1/16S473J CKSQYB104K16 RS1/16S103J CKSQYB104K16 RS1/16S104J...
  • Page 31 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- Transistor 2SC2712 Diode UDZ5R6(B) Transistor 2SA1255 Diode UDZ8R2(B) Transistor DTC144EK Diode MA153 Transistor 2SA1255 Diode UDZ20(B) Transistor DTC144EK Inductor LCYA100K3225 Transistor...
  • Page 32 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- RS1/8S472J RS1/10S223J RS1/8S471J RS1/10S223J RS1/10S103J RS1/10S222J RS1/10S103J RS1/10S473J RS1/10S473J RS1/10S102J RS1/4S101J RS1/10S473J RS1/4S101J RS1/10S102J RS1/10S103J RS1/10S473J RS1/10S103J RS1/10S102J RS1/10S473J RS1/10S473J RS1/4S101J...
  • Page 33 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- RS1/10S222J RS1/10S103J RS1/10S473J RS1/10S103J RS1/10S102J RS1/10S103J RS1/10S222J RS1/10S123J RS1/10S222J RS1/10S103J RS1/10S222J RS1/10S103J RS1/10S473J RS1/4S101J RS1/10S473J RS1/4S101J RS1/10S473J RS1/10S222J RS1/10S473J RS1/10S223J RS1/10S123J...
  • Page 34 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- CKSQYB102K50 CKSQYB102K50 CKSQYB103K25 CKSQYB102K50 CKSQYB103K25 CEJA2R2M50 CEJA100M16 CEJA2R2M50 CKSQYB102K50 CEJANP2R2M50 CKSQYB103K25 CEJANP2R2M50 CEJA100M16 CCSQCH331J50 CKSQYB102K50 CCSQCH331J50 CKSQYB103K25 CCSQCH471J50 CKSQYB223K50 CCSQCH471J50 CKSQYB102K50...
  • Page 35 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- Transistor DTC143EK Transistor 2SA1162 CAPACITORS Transistor 2SB1132 Transistor DTA114EK CKSQYB102K50 Transistor DTC143EK CKSQYB102K50 CKSQYB102K50 Transistor 2SA1162 CKSQYB102K50 Transistor 2SB1132 CKSQYB102K50 Transistor...
  • Page 36 KEX-M8886ZT ,M8886ZT-91 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ -------------------------------------------- ------------------------- ------ -------------------------------------------- ------------------------- RS1/8S0R0J RS1/16S223J Unit Number : RS1/16S223J Unit Name : PCB Unit RS1/16S561J RS1/16S561J Inductor ETH0001 Switch(Load) ESG1004 RS1/8S223J Switch(70µS) ESG1004 RS1/8S223J...

  • Page 37: Adjustment

    KEX-M8886ZT ,M8886ZT-91 6. ADJUSTMENT 6.1 TUNER/AUDIO ADJUSTMENT - Connection Diagram BACK UP +13.2V DC Regulated Power Supply Lch + 4Ω Lch - mV Meter (1) Oscilloscope (1) GM-8886ZT/UC Rch + 4Ω Rch - Dummy Antenna Antenna Plug 50Ω(37.5Ω ) Stereo FM SSG Modulator 50Ω(75Ω)
  • Page 38 KEX-M8886ZT ,M8886ZT-91 FM ADJUSTMENT Modulation M:MONO MOD., 400Hz 30%(22.5kHz Dev.) or 400Hz 100%(75kHz Dev.) S1: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 SSG Displayed Adjustment...

  • Page 39: Test Mode

    KEX-M8886ZT ,M8886ZT-91 AM NOISE CANCELER ADJUSTMENT 6.2 TEST MODE Connection: KEX-M8886ZT/UC 1. Entering the mode Apply 5V to TEST Terminal(pin73) of system micro- Output 2-signal pad AM dummy Sample Noise meter computer IC601,and ACC ON,then restart. Pulse generator (equivalent to HP8011A) 2.
  • Page 40 KEX-M8886ZT ,M8886ZT-91 - Precautions 3 Timing 1 Service mode is an "antenna exchange mode" and only available with the 3-stage-variable type. ANTB In Service mode, the antenna length will be (amplifier signal) longer than that in AM mode.(See page 39) ANT0 2 Switching sound sources is inhibited in Service (antenna length...
  • Page 41 KEX-M8886ZT ,M8886ZT-91 6.4 SERVICE MODE FOR DSP AMPLIFIER 1. Outline This specifications details operation according to our suggestion for answering complaint about sound quality in audio systems. It is based on an assumption that a dealer or service person operate the product to solve the problem.
  • Page 42 KEX-M8886ZT ,M8886ZT-91 Sound Quality Service mode Displaying "AUDIO" FM1/2 TAPE Displaying "P1 XXX" Displaying "F XX" FM1/2 TAPE Displaying "P2 XXX" Displaying "R XX" FM1/2 TAPE Displaying "L XX" Displaying "W XX" FM1/2 TAPE Frequency characteristics Level adjustment function adjustment function Flowchart of displays in Sound Quality Adjustment mode...
  • Page 43 KEX-M8886ZT ,M8886ZT-91 5. Details • Set woofer 1 Frequency characteristics adjustment function The system displays "W" and level value. Use the • The system changes submodes cyclically every UP/DOWN button to change level value within a time the [FM1/2] button is pressed when range from 0 to -80 dB at increments of 1 dB.

  • Page 44: General Information

    KEX-M8886ZT ,M8886ZT-91 7. GENERAL INFORMATION 7.1 PARTS 7.1.1 IC PA4026A HA12173-01 41 40 39 38 37 36 35 34 33 32 31 30 29 EQ OUT NO I DOLBY B/C-NR EQ OUT-M MS GND 120/70 NF I MA OUT MS I VREF MS DET MS VCC...
  • Page 45 KEX-M8886ZT ,M8886ZT-91 HA12181FP S-80736AN-D0...
  • Page 46 KEX-M8886ZT ,M8886ZT-91 - Pin Functions (PD4919A) Pin No. Pin Name Format Function and Operation A/D converter input from FADER volume A/D converter input Not used AVSS A/D GND ANSW Analog SW Chip enable output for PLL IC AVREF1 (D/A converter standard voltage) Data input from PLL IC Data output for PLL IC Serial clock output for PLL IC...
  • Page 47 KEX-M8886ZT ,M8886ZT-91 Pin No. Pin Name Format Function and Operation eject Eject key input pin Power switch swvdd Key board unit power supply control output Power supply Crystal oscillator connection pin Crystal oscillator connection pin Not used TEST Test terminal AVDD Positive power supply terminal for analog circuit AVREF0...

  • Page 48: Display

    KEX-M8886ZT ,M8886ZT-91 7.1.2 DISPLAY - CAW1463...

  • Page 49: Diagnosis

    KEX-M8886ZT ,M8886ZT-91 7.2 DIAGNOSIS 7.2.1 DIAGNOSIS MODE...
  • Page 50 KEX-M8886ZT ,M8886ZT-91...
  • Page 51 KEX-M8886ZT ,M8886ZT-91...
  • Page 52 KEX-M8886ZT ,M8886ZT-91...

  • Page 53: Disassembly

    KEX-M8886ZT ,M8886ZT-91 7.2.2 DISASSEMBLY - Removing the Case 1. Remove the five screws A. 2. Insert and turn a flat screwdriver at locations indicated by arrows to remove the Case. - Removing the Grille Assy 1. Remove the two screws B. 2.

  • Page 54: Connector Function Description

    KEX-M8886ZT ,M8886ZT-91 7.2.3 CONNECTOR FUNCTION DESCRIPTION ANTENNA JACK SGND ANT+ ANTA ANTB ILL- ILL+ BUS+ BUS- MUTE...

  • Page 55: Explanation

    KEX-M8886ZT ,M8886ZT-91 7.3 EXPLANATION 7.3.1 BLOCK DIAGRAM...

  • Page 56: System Block Diagram

    KEX-M8886ZT ,M8886ZT-91 7.3.2 SYSTEM BLOCK DIAGRAM FUSE ECU IG RADIO#2 RADIO#1 PANEL SPEAKERS THEOSTAT TW SP GM-8886ZT ILL+ ILL+ (RH) 5CH AMP ILL- ILL- KEX-M8886ZT FR SP HEAD UNIT (RH) Shield MOTOR ANT AMP+ AMP+ FR SP ANTA ANTA (LH) ANTB ANTB GND(S)

  • Page 57: Operations And Specifications

    KEX-M8886ZT ,M8886ZT-91 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS - RADIO PRESET RECALL PRESET CH.MEMORY PREMIUM SOUND SYSTEM P6807 FM1/2 FM1/2 TAPE SCAN, PRESET SCAN SCAN PROG B•C SKIP SCAN MANUAL, TUNE SEEK SCAN DISC FAST RANDOM SEEK TUNING TRACK BASS TREB FADE DOWN...

  • Page 58: Specifications

    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 JULY 1998 Printed in Japan...

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