Pioneer DEH-P8000R Service Manual
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Pioneer DEH-P8000R Service Manual

Pioneer DEH-P8000R Service Manual

Multi-cd/md/dab control high power cd player with rds tuner
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Service
Manual
MULTI-CD/MD/DAB CONTROL HIGH POWER CD PLAYER WITH RDS TUNER
DEH-P8000R
- See the separate manual CX-916(CRT2300) for the CD mechanism description, disassembly and circuit
description.
- The CD mechanism employed in this model is one of S8 series.
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST .......................3
4. PCB CONNECTION DIAGRAM ................................28
5. ELECTRICAL PARTS LIST ........................................38
6. ADJUSTMENT..........................................................45
PIONEER ELECTRONIC CORPORATION
PIONEER ELECTRONICS SERVICE INC.
PIONEER ELECTRONIC [EUROPE] N.V.
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER ELECTRONIC CORPORATION 1999
7. GENERAL INFORMATION .......................................49
7.1 DIAGNOSIS ........................................................49
7.1.1 TEST MODE ..............................................49
7.1.2 DISASSEMBLY .........................................53
7.2 IC ........................................................................58
8. OPERATIONS AND SPECIFICATIONS.....................70
K-ZZB. APR. 1999 Printed in Japan
ORDER NO.
CRT2352
EW

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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 ELECTRONIC CORPORATION 1999 K-ZZB. APR. 1999 Printed in Japan...

  • Page 2: Safety Information

    DEH-P8000R - CD Player Service Precautions 2. During disassembly, be sure to turn the power off 1. For pickup unit(CXX1285) handling, please refer since an internal IC might be destroyed when a con- to"Disassembly"(see page 53). nector is plugged or unplugged.

  • Page 3: Exploded Views And Parts List

    DEH-P8000R 2. EXPLODED VIEWS AND PARTS LIST 2.1 PACKING 15 15...
  • Page 4 DEH-P8000R 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 Mark No. Description Part No.
  • Page 5 DEH-P8000R 2.2 EXTERIOR...
  • Page 6 DEH-P8000R - EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ26P060FMC 46 Panel Assy CXB3580 2 Screw BSZ30P050FMC 47 Screw BMZ20P030FMC 3 Cord Assy CDE5841 48 Screw CBA1154 4 Cord Assy CDE5842...
  • Page 7 DEH-P8000R Mark No. Description Part No. 91 Button(SOURCE) CAC5892 92 Button( CAC5893 93 Button(EQ) CAC5894 94 Button(1-6) CAC5896 95 Housing CNV5606 96 Keyboard Unit CWM6225 97 Connector(CN1902) CKS3995 98 Connector(CN1901) CKS3996 99 PCB CNP5508 100 OEL Module MXK8002 101 Grille Unit...

  • Page 8: Cd Mechanism Module

    DEH-P8000R 2.3 CD MECHANISM MODULE...
  • Page 9 DEH-P8000R - CD MECHANISM MODULE SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Control Unit CWX2358 46 Sheet CNM6215 2 Connector(CN802) CKS2192 47 Ball CNR1189 3 Connector(CN801) CKS2193 48 Belt CNT1086 4 Connector(CN701) CKS2771...

  • Page 10: Block Diagram And Schematic Diagram

    DEH-P8000R 3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 3.1 BLOCK DIAGRAM TUNER AMP UNIT Q154 Q155 Q153 Q151 FM/AM TUNER UNIT FM/AM 1ST IF 10.7MHz FM FRONT END TMUTE tmute FM MPX T51 Q51 CF51 CF52 CF53 CN451 ldet GND2 Q501...
  • Page 11 DEH-P8000R LLER Q911 Q913 BACKUP BACKUP POWER AMP RL– RL– LECTRICAL VOLUME/ PV IN_L OURCE SELECTOR IC 301 FL– PAL005A FL– IC 203 PML004AF PREL MUTE STBY B.REM B.REM B.REM Q932 Q301 MUTE LEVEL DET. Q931 IC 231 asens LEVEL L...

  • Page 12: Overall Connection Diagram(Guide Page)

    DEH-P8000R 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”. CD,TUNER,IP-BUS SIGNAL TUNER SIGNAL IP-BUS SIGNAL CD MECHANISM Large size CD SIGNAL SCH diagram MODULE...
  • Page 13 DEH-P8000R TUNER AMP UNIT PRE OUT E-VOL PRE OUT CD:+18.3dBs CD:+7.8dBs R659 0R0 CD:+1.7dBs IP-BUS:+2.2dBs FM(100%):-16.5dBs AM(30%):-27dBs RESET POWER AMP BACK SYSTEM CONTROLLER LEVELL LEVELL LEVELR LEVELR PD5486A CEK1136 BACK UP 1K(1/2W) B REMOTE 1K(1/2W) BUZZER DOOR SW MUTE CD:+33.8dBs...
  • Page 14 DEH-P8000R...
  • Page 15 DEH-P8000R A-a D...
  • Page 16 DEH-P8000R...
  • Page 17 DEH-P8000R...
  • Page 18 DEH-P8000R 3.3 FM/AM TUNER UNIT Voltage of IC Terminals Mark Band Input Level None – – 0dBf 65dBf F125 125dBf 0dBµ 74dBµ A125 125dBµ...
  • Page 19 DEH-P8000R...

  • Page 20: Keyboard Unit

    DEH-P8000R 3.4 KEYBOARD UNIT VOL+ DISP S1901,1902:CSG1113 S1903,1904:CSG1111 SOURCE VOL- S1905-1924:CSG1113 S1925:CSG1111 AUDIO BAND EJECT FUNC CN801...
  • Page 21 DEH-P8000R KEYBOARD UNIT...

  • Page 22: Cd Mechanism Module

    DEH-P8000R 3.5 CD MECHANISM MODULE CONTROL UNIT PICKUP UNIT(SERVICE) RF-A CN101 SWITCHES: CONTROL UNIT S801 : HOME SWITCH..ON-OFF S802 : CLAMP SWITCH..ON-OFF The underlined indicates the switch position. CD DRIVER PHOTO UNIT Q1 CPT230SX-TU Q2 CPT230SX-TU CN802 SPINDLE MOTOR M3 CXB2562...
  • Page 23 DEH-P8000R RF-AMP,SERVO,DSP,DAC SINGLE-CD CONTROLLER...
  • Page 24 DEH-P8000R Note:1. The encircled numbers denote measuring pointes in the circuit diagram. 2. Reference voltage REFO:2.5V - Waveforms 1 RFI 1 CH1: RFI 1 CH1: RFI 0.5V/div. 0.5µs/div. 1V/div. 1V/div. 0.5ms/div. 0.5ms/div. 2 CH2: MIRR 2 CH2: MIRR Normal mode: play 5V/div.
  • Page 25 DEH-P8000R 8 CH1: TE 8 CH1: TE 0 MD 0.2V/div. 0.5V/div. 0.5V/div. 0.1s/div. 20ms/div. 5ms/div. 9 CH2: TD ! CH2: SD 0.2V/div. 0.5V/div. Normal mode: play TEST mode: 100 Tracks jump(FWD) Normal mode: Play (12cm) → REFO → REFO →...
  • Page 26 DEH-P8000R ( CH1: R OUT 6 CH1: FE 8 CH1: TE 1V/div. 0.2V/div. 0.2V/div. 0.2ms/div. 1ms/div. 1ms/div. ) CH2: L OUT 3 CH2: FD 9 CH2: TD 1V/div. 0.5V/div. 0.5V/div. Normal mode: Play (1kHz 0dB) Normal mode: During AGC Normal mode: During AGC →...
  • Page 27 DEH-P8000R...

  • Page 28: Pcb Connection Diagram

    DEH-P8000R 4. PCB CONNECTION DIAGRAM CORD ASSY MAIN ANTENNA 4.1 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 29 DEH-P8000R SIDE A CN1901...
  • Page 30 DEH-P8000R TUNER AMP UNIT...
  • Page 31 DEH-P8000R SIDE B...
  • Page 32 DEH-P8000R 4.2 FM/AM TUNER UNIT SIDE A...
  • Page 33 DEH-P8000R SIDE B...
  • Page 34 DEH-P8000R 4.3 KEYBOARD UNIT KEYBOARD UNIT KEYBOARD UNIT SIDE B SIDE A...

  • Page 35: Switch Pcb

    DEH-P8000R 4.4 SWITCH PCB SWITCH PCB BLUE WHITE CN851...
  • Page 36 DEH-P8000R 4.5 CD MECHANISM MODULE SIDE A...
  • Page 37 DEH-P8000R SIDE B...

  • Page 38: Electrical Parts List

    DEH-P8000R 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 39 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Crystal Resonator 3.648MHz CSS1447 RS1/10S0R0J Radiator 10.00MHz CSS1475 RS1/10S473J Buzzer CPV1012 RS1/10S473J FM/AM Tuner Unit CWE1500 RS1/10S681J RS1/10S681J RESISTORS...
  • Page 40 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S0R0J CAPACITORS RS1/10S0R0J RS1/16S473J CKSQYB104K16 RS1/16S0R0J CKSQYB104K16 RS1/8S102J CEJA1R0M50 CEJA1R0M50 RS1/10S103J CKSQYB223K50 RS1/10S223J RS1/10S223J CKSQYB123K25 RS1/10S223J CKSQYB123K25 RS1/10S272J CEJA470M16...
  • Page 41 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CEJA100M16 CEJA101M16 CKSYB105K16 CKSYB105K16 CEJA100M35 CKSYB103K50 CEJA100M35 CKSQYB102K50 CEJA100M35 CKSQYB104K16 CEJA100M35 CEJA2R2M50 CKSRYB222K50 CEJA220M16 CKSRYB222K50 CKSQYB473K50 CKSRYB222K50 CKSQYB102K50 CKSRYB222K50...
  • Page 42 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/16S470J CKSRYB104K16 RS1/16S103J CKSQYB224K16 RS1/16S103J CKSRYB223K25 RS1/16S331J CKSRYB104K16 RS1/16S331J CEALNP100M10 RS1/16S560J CCSRCH151J50 RS1/16S560J CKSRYB473K16 RS1/16S102J CKSRYB682K25 RS1/16S225J CEAL2R2M50 RS1/16S133J...
  • Page 43 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Unit Number : CWM6225 1922 RS1/10S121J Unit Name : Keyboard Unit 1923 RS1/10S2R2J 1924 RS1/8S222J 1925 RS1/8S222J MISCELLANEOUS 1930...
  • Page 44 DEH-P8000R =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RESISTORS CKSQYB104K16 CKSRYB104K16 RS1/8S120J CKSQYB104K16 RS1/8S100J CKSRYB104K16 RS1/16S222J CKSRYB104K16 RS1/16S104J CKSRYB104K16 RS1/16S103J CKSRYB104K16 RS1/16S393J CKSRYB104K16 RS1/16S182J CKSQYB471K50 RS1/16S304J CEV101M10...

  • Page 45: Adjustment

    DEH-P8000R 6. ADJUSTMENT 6.1 CD ADJUSTMENT 1) Precautions 2) Test Mode • This unit uses a single power supply (+5V) for the reg- This mode is used for adjusting the CD mechanism ulator. The signal reference potential, therefore, is module of the device.
  • Page 46 DEH-P8000R - Flow Chart Test Mode In Reset SOURCE Sourse CD New test mode BAND Power ON (Adjustment for T.Offset) Power ON RF AMP Gain Select (Not adjustment for T.Offset) 00 00 00 Display 99 99 99 GG GG GG...

  • Page 47: Checking The Grating After Changing The Pickup Unit

    DEH-P8000R 6.2 CHECKING THE GRATING AFTER CHANGING THE PICKUP UNIT • Note : The grating angle of the PU unit cannot be adjusted after the PU unit is changed. The PU unit in the CD mecha- nism module is adjusted on the production line to match the CD mechanism module and is thus the best adjusted PU unit for the CD mechanism module.
  • Page 48 DEH-P8000R Ech → Xch 20mV/div, AC Grating waveform Fch → Ych 20mV/div, AC 0° 30° 45° 60° 75° 90°...

  • Page 49: General Information

    DEH-P8000R 7. GENERAL INFORMATION 7.1 DIAGNOSIS 7.1.1 TEST MODE - Error Messages If a CD is not operative or stopped during operation due to an error, the error mode is turned on and cause(s) of the error is indicated with a corresponding number. This arrangement is intended at reducing nonsense calls from the users and also for facilitating trouble analysis and repair work in servicing.
  • Page 50 DEH-P8000R - New Test Mode S-CD plays the same way as before. If an error such as off focus, spindle unlocking, unreadable sub-code, or sound skipping occurs after setup, its cause and time occurred (in absolute time) are displayed. During setup, operational status of the control software (internal RAM: CPOINT) is displayed.
  • Page 51 DEH-P8000R (4) Display of Operational Status (CPOINT) during Setup Status No. Contents Protective action CD+5V ON process in progress. None Servo LSI initialization (1/3) in progress. None Servo LSI CRAM initialization in progress. None Servo LSI initialization (2/3) in progress.
  • Page 52 DEH-P8000R (5) Display Examples 1) During Setup (When status no. = 11) TRK No. MIN. SEC. 11" 2) During Operation (TOC read, TRK search, Play, FF and REV) The same as in the normal mode. 3) When a Protection Error Occurred Switch to the following displays (A) and (B) using the [BAND] switch: (A) Error occurrence timing display in absolute time.

  • Page 53: Disassembly

    DEH-P8000R 7.1.2 DISASSEMBLY CD Mechanism Module - Removing the Case (Not shown) 1. Remove the two screws, and then remove the Case. - Removing the CD Mechanism Module 1. Remove the four screws A. 2. Disconnect the connector, and then remove the CD Mechanism Module.
  • Page 54 DEH-P8000R - Removing the Tuner Amp Unit (2/2) Antenna Cable 1. Remove the screw A, four screws C, and then remove the Antenna Cable and Holder. 2. Remove the screw B. 3. Stretch the four tabs, and then remove the Tuner Amp Unit.
  • Page 55 DEH-P8000R - Removing the Upper Frame 1. Remove six Springs A, two Springs B and four Upper Frame Screws. 2. Remove two Tabs situated on rear side of the Upper Frame, remove two Arms on the front side, then remove two Tabs on the front side.
  • Page 56 DEH-P8000R - Removing the Guide Arm Assy 1. Remove a connector, a spring A and B Guide Arm Assy Section 2. Drive the Guide Arm Assy up aslant into rear side direction, then remove it from a Pin. Finally, drive the assembly approximately 45 degrees upward, then slide the assembly toward left side to remove it.
  • Page 57 DEH-P8000R - Removing the Loading Motor and Carriage Motor 1. Remove the Spring and two Screws A. Guide 2. Dismount the Loading Motor. 3. Remove the Belt, a Screw B, two Screws C, a Guide Screw Unit Carriage Motor and a Screw Unit.
  • Page 58 DEH-P8000R 7.2 IC PML004AF PD5486A UPD63710GC PA2028A BA6288FS BA5985FM PAL005A BR9010FV PE5011C S-81250SGUP PD5471A PM4009A PD8051A PML004AF...
  • Page 59 DEH-P8000R PA2028A PAL005A P-GND2 OUT2- STBY OUT2+ OUT1- P-GND1 OUT1+ S-GND Ac_gnd OUT3+ P-GND3 OUT3- OUT4+ MUTE OUT4- S-81250SGUP P-GND4 Switch_out...
  • Page 60 DEH-P8000R PM4009A - Pin Functions (PD5486A) Pin No. Pin Name Function and Operation TUNPDO PLL data output TUNPCK PLL clock output TUNPCE PLL chip enable output TUNPCE2 PLL chip enable output 2 Not used IPPW IP-BUS power supply control output...
  • Page 61 DEH-P8000R Pin No. Pin Name Function and Operation P-BUS communication data output P-BUS communication data input BSCK P-BUS serial clock input/output FLPOPN Flap motor open output DPDT Display serial data output KYDT Display enable data input FLPCLS Flap motor close output...
  • Page 62 DEH-P8000R *PD5486A IC's marked by* are MOS type. Be careful in handling them because they are very liable to be damaged by electrostatic induction. BA6288FS DRIVER CONTROL LOGIC POWER SAVE DRIVER BR9010FV : Chip select input : Serial data clock input...
  • Page 63 DEH-P8000R - Pin Functions (PD5471A) Pin No. Pin Name Format Function and Operation 1–4 Not used Remote control reception BYTE External data BUS width select input CNVSS Processor mode select input Not used reset Reset input XOUT Crystal oscillating element connection pin...
  • Page 64 DEH-P8000R PD8051A A0-A19 :Address input D0-D15 :Data output byte :8/16 bit mode select :Chip enable input :Output enable input :Power supply :GND byte D15/A1...
  • Page 65 DEH-P8000R - Pin Functions (UPD63710GC) Pin No. Pin Name Function and Operation Logic circuit GND HOLD Defect detection output MIRR MIRR output RFOK signal output Reset signal input Command/parameter identification signal input Data strobe signal input Clock signal input for serial data input/output...
  • Page 66 DEH-P8000R Pin No. Pin Name Function and Operation ATEST Test pin RFMODE Use/not use select for internal RF amplifier A.GND Analog circuit GND Focus drive output Tracking drive output Sled drive output Spindle drive output DACO DAC output for adjustment...
  • Page 67 DEH-P8000R - Pin Functions (BA5985FM) Pin No. Pin Name Function and Operation Loading driver FWD input OPIN1(+) CH1 pre-amplifier input OPIN1(−) CH1 pre-amplifier inverted input OPOUT1 CH1 pre-amplifier output OPIN2(+) CH2 pre-amplifier input OPIN2(−) CH2 pre-amplifier inverted input OPOUT2 CH2 pre-amplifier output Power supply VOL(−)
  • Page 68 DEH-P8000R - Pin Functions(PE5011C) Pin No. Pin Name Format Function and Operation EJTSNS Disc eject position sense input DSCSNS Disc insert position sense input VDSENS VD power supply short sense input TEMP Temperature sense input Not used VSS AVREF A/D reference voltage input...
  • Page 69 DEH-P8000R Pin No. Pin Name Format Function and Operation tsck CD-TEXT serial clock output CD-TEXT serial data output CD-TEXT serial data input AVSS A/D GND *PE5011C...

  • Page 70: Operations And Specifications

    DEH-P8000R 8. OPERATIONS AND SPECIFICATIONS - Connection Diagram...
  • Page 71 DEH-P8000R 8.1 OPERATIONS DISPLAY button FUNCTION button EJECT button 5/∞/2/3 buttons RESET button ENTERTAINMENT button EQ button BAND button Buttons 1–6 +/– button PGM button PTY button TA button AUDIO button SOURCE/OFF button ATT button This lets you quickly lower volume level (by about 90%).
  • Page 72 DEH-P8000R...
  • Page 73 DEH-P8000R...
  • Page 74 DEH-P8000R...

  • Page 75: Specifications

    DEH-P8000R 8.2 SPECIFICATIONS A Title (English) Specifications General CD player Power source ..14.4 V DC (10.8 – 15.1 V allowable) System ........Compact disc audio system Grounding system ........Negative type Usable discs ..........Compact disc Max. current consumption ........10.0 A Signal format ....

  • Page 76: Meguro 1-Chome, Meguro-Ku, Tokyo 153-8654, Japan

    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 ELECTRONIC CORPORATION 1998 K-FZA. DEC. 1998 Printed in Japan...

  • Page 77: Circuit Descriptions

    CX-916 1. CIRCUIT DESCRIPTIONS The LSI (UPD63710GC) used on this unit comprises five main blocks ; the pre-amp section, servo, signal processor, DAC and CD text decoder (not used on this model). It also equips with nine automatic adjustment functions. 1.1 PRE-AMP SECTION This section processes the pickup output signals to create the signals for the servo, demodulator and...
  • Page 78 CX-916 2) RF Amplifier and RFAGC Amplifier 3) RFOK Circuit The photo-detector outputs (A + C) and (B + D) are This circuit generates the signal that is used for added, amplified and equalized on this LSI and then indicating the timing of closing the focus or state of the output to the RFI terminal as the RF signal.
  • Page 79 CX-916 4) Focus Error Amplifier The photo-detector outputs (A + C) and (B + D) are passed through a differential amplifier and an error amplifier, and then (A + C − B − D) is output from Pin 91 as the FE signal. The FE voltage low frequency component is : (80k//300k) FE = (A + C −...
  • Page 80 CX-916 7) DFCT (Defect) Circuit 8) 3TOUT Circuit The DFCT signal is used for detecting defects on the The 3TOUT signal is generated by entering disturbance mirrored disc surface. It allows monitoring from the to the focus servo loop, comparing phase of HOLD pin (Pin 2).
  • Page 81 CX-916 10) EFM Circuit This circuit is used for converting the RF signal to digital signal consisting of “0” and “1”. The RFO signal from Pin 75 is externally AC coupled, entered to Pin 74, then applied to the EFM circuit. Loss of the RF signal due to scratches or stains on the disc, or vertical asymmetry of the RF due to variations in the discs manufactured can’t be eliminated by AC...
  • Page 82 CX-916 1.2 SERVO SECTION (UPD63710GC : IC201) The servo section controls the operations such as error signal equalizing, in focus, track jump and carriage move. The DSP is the signal processing section used for data decoding, error correction and interpolation processing, among others.
  • Page 83 CX-916 When the above conditions are all met and the focus is closed, the XSI pin goes to low from the current high, then 40 ms later, the microcomputer begins to monitor the RFOK signal after it that has been passed through REFO the low pass filter.
  • Page 84 CX-916 2) Tracking Servo System The digital equalizer is employed for the main equalizer IC301 IC201 UPD63710GC BA5985FM on the tracking servo. Fig.12 shows the tracking servo block diagram. DIG. LENS CONTROL JUMP R310 PARAMETERS Fig.12 : TRACKING SERVO BLOCK DIAGRAM a) Track jump When the LSI receives the track jump command from the microcomputer, the operation is carried out...
  • Page 85 CX-916 b) Brake Circuit The servo retracting performance can be deteriorate during the setup or track jump operation. In this connection, the brake circuit is used to ensure steady retract of the tracking servo. The brake circuit detects in which direction the lens is moving, then slows down its move by outputting the drive signal that moves the lens into the opposite direction alone.
  • Page 86 CX-916 3) Carriage Servo System The carriage servo supplies the tracking equalizer’s low-frequency component (lens position data) output to the carriage equalizer, then, after providing a fixed amount of gain to it, outputs the drive signal from the LSI. This signal is then applied to the carriage motor via the driver IC.
  • Page 87 CX-916 4) Spindle Servo System IC301 The spindle servo has the following modes. IC201 UPD63710GC BA5985FM 1 Kick : This mode is used for accelerating the disc rotation SPEED ERROR SIGNAL during setup. DIG. SPINDLE 2 Offset : SIGNAL BLOCK MOTOR (a) After the kick is over in the setup, this mode is PHASE ERROR SIGNAL...
  • Page 88 CX-916 1.3 AUTOMATIC ADJUSTMENT FUNC- TIONS Every circuit adjustment on the CD-LSI of this system is automated. Every circuit adjustment is automatically implemented when the disc is inserted or the CD mode is selected from the source key. The following describes how the adjustments are executed.
  • Page 89 CX-916 5) Focus and Tracking Automatic Gain Control This adjustment takes place at the following timing : • When the focus close alone is completed during the This function is used for implementing automatic setup process. control of the focus and tracking loop gain. •...
  • Page 90 CX-916 8) Initial Adjusting Values All the automatic adjustments are implemented using the previous adjustment values as the initial values unless the microcomputer power (the backup power) is not turned off (though there are some exceptions). When the backup is turned off, automatic adjustment is executed based on the initial values rather than the previous adjustment values.
  • Page 91 CX-916 1.4 POWER SUPPLY AND LOADING SECTION The power supply of the system uses VD (8.3V) from the mother board. VD is fed to 5 channel CD driver IC, 5V Reg IC and disc detection LED. The microcomputer turns on or off the CD driver and the 5V using “CONT”...

  • Page 92: Mechanism Descriptions

    CX-916 2. MECHANISM DESCRIPTIONS Centering Arm Centering Arm - Loading Operation (when a 12 cm disc is used) Disc Detection Arm 1. Insert a 12 cm disc (the sensor turns on the motor Lock Lever revolution). 2. The disc pushes the Lock Lever in, thereby resetting the lock currently applied to the Centering Arms.
  • Page 93 CX-916 3. DISASSEMBLY - Removing the Upper Frame Upper Frame 1. Remove six Springs A, two Springs B and four Screws. 2. Remove two Tabs situated on rear side of the Upper Frame, remove two Arms on the front side, then remove two Tabs on the front side.
  • Page 94 CX-916 - Removing the Guide Arm Assy 1. Remove a connector, a spring A and B Guide Arm Assy Section 2. Drive the Guide Arm Assy up aslant into rear side direction, then remove it from a Pin. Finally, drive the assembly approximately 45 degrees upward, then slide the assembly toward left side to remove it.
  • Page 95 CX-916 - Removing the Loading Motor and Carriage Motor 1. Remove the Spring and two Screws A. Guide 2. Dismount the Loading Motor. 3. Remove the Belt, a Screw B, two Screws C, a Guide Screw Unit Carriage Motor and a Screw Unit. 4.

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