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Pioneer CDX-MG6056ZH Service Manual
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Pioneer CDX-MG6056ZH Service Manual

Pioneer CDX-MG6056ZH Service Manual

6 disc in-dash cd changer
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Service
Manual
6 DISC IN-DASH CD CHANGER
CDX-MG6056
VEHICLE
DESTINATION
Gold Wing
U.S.A., CANADA
- This service manual should be used together with the manual(s) listed below.
For the parts numbers, adjustments, etc. which are not shown in this manual,
refer to the following manual(s).
Model No.
CDX-MG6346ZH/ES
CX-890
EXPLODED VIEWS AND PARTS LIST
PACKING(Page 3)
- PACKING SECTION PARTS LIST
Mark No. Symbol and Description
5 Owner's Manual
11 Carton
12 Contain Box
Protector
EXTERIOR(Page 4)
- EXTERIOR SECTION PARTS LIST
Mark No. Symbol and Description
4 Chassis Unit
8 Bracket
18 Cord
27 Door
41 Grille Unit
PIONEER CORPORATION
PIONEER ELECTRONICS (USA) INC.
PIONEER EUROPE NV
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2001
PRODUCED AFTER
November 2000
Order No. Mech. Module Remarks
CRT2407
CRT2376
G1
CDX-MG6346ZH/ES
CRB1744
CHG4457
CHL4457
CHP2435
CDX-MG6346ZH/ES
CXB7455
CNC8026
CDE6148
CAT2309
CXB8378
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
HONDA PART No.
08A06-MCA-B00
CD Mech. Module:Circuit Description, Mech.Description, Disassembly
Part No.
CDX-MG6056ZH/UC
CRB1627
(English)
CHG4212
CHL4212
Not used
Part No.
CDX-MG6056ZH/UC
CXB7456
CNC8816
CDE6498
CAT2250
CXB7487
ORDER NO.
CRT2824
ZH
UC
PIONEER MODEL No.
CDX-MG6056ZH/UC
K-ZZS. DEC. 2001 Printed in Japan

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Summary of Contents for Pioneer CDX-MG6056ZH

  • Page 1 PIONEER ELECTRONICS (USA) INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE NV Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936 C PIONEER CORPORATION 2001 K-ZZS. DEC. 2001 Printed in Japan...

  • Page 2: 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 3: Safety Information

    CDX-MG6346ZH,MG6446ZH - CD Player Service Precautions - When the Repair is Complete 1. For pickup unit(CXX1311) handling, please refer When the repair is complete, make the CD mechanism to"Disassembly"(see page 52). ready for transportation implementing the following During replacement, handling precautions shall be procedures: taken to prevent an electrostatic discharge(protection by a short pin).

  • Page 4: Exploded Views And Parts List

    CDX-MG6346ZH,MG6446ZH 2. EXPLODED VIEWS AND PARTS LIST 2.1 PACKING 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.
  • Page 5 CDX-MG6346ZH,MG6446ZH 2.2 EXTERIOR...
  • Page 6 CDX-MG6346ZH,MG6446ZH - EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BMZ20P020FMC 29 Spring CBH2201 2 Screw BMZ26P030FMC 30 Spring CBH2200 3 Screw BMZ26P060FMC 31 Conductor CNC8051 4 Chassis Unit CXB3407 32 Lighting Conductor CNV5901 (CDX-MG6346ZH/ES) Chassis Unit...
  • Page 7 CDX-MG6346ZH,MG6446ZH 2.3 CD MECHANISM...
  • Page 8 CDX-MG6346ZH,MG6446ZH - CD MECHANISM SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1-9 ••••• 54 Shaft CLA3693 10 CD Core Unit(Servo Unit) CWX2202 55 Steer CNC7215 11 Connector(CN101) CKS2764 56 Steer CNC7216 12 Connector(CN301) CKS3966 57 Cam CNC7227 13 Connector(CN201)
  • Page 9 CDX-MG6346ZH,MG6446ZH Mark No. Description Part No. Mark No. Description Part No. 99 Frame Unit CXB2702 144 Screw JFZ14P020FZK 100 Lever Unit CXB2703 145 Washer YE15FUC 101 Arm Unit CXB2704 146 Arm Unit CXB4953 102 Lever Unit CXB2708 147 Arm Unit CXB4954 103 Lever Unit CXB2709...
  • Page 10 CDX-MG6346ZH,MG6446ZH Mark No. Description Part No. 189 LED(D891,892) CL202IRXTU 190 Switch(S887 CLAMP) CSN1051 191 Switch(S886 ELV HOME) CSN1052 192 Bracket Unit CXB4306 CPT230SCTD(CD) Photo-transistor(Q851,852) 194 Resistor(R856) RS1/8S911J 195 Resistor(R857) RS1/8S821J 196 Photo-interrupter(Q1) RPI-221 197 ••••• 198 Pickup Unit(Service)(P8) CXX1311...

  • Page 11: Block Diagram And Schematic Diagram

    CDX-MG6346ZH,MG6446ZH 3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM 3.1 BLOCK DIAGRAM CD CORE UNIT(SERVO UNIT) PICKUP UNIT(SERVICE) CD CORE UNI CN101 RF AMP CN201 CN801 IC201 IC101 UPD63702AGF Q101 UPC2572GS SHOCKPROOF HOLOGRAM CONTROL UNIT WDCK DIGITAL SERVO RFCK Q102 RAOV IC501 PROCESSOR FOCUS ACT LRCK...
  • Page 12 CDX-MG6346ZH,MG6446ZH RE UNIT(STS UNIT) EXTENSION UNIT 8fs DF D/A LPF ANALOG SWITCH CN101 CN701 CN102 CD MUTE IC601 IC101 IC103 CD-LCH DATA AK4321VF NJM4558MD TC74HC4066AF Q101 LRCK NHOUT BUS+ IC501 XTLI BUS- NHPOW DEMO CA0008AM Q104 Q701 ASENS SWDACC VD REGULATOR Q751 Q754 9 10 14...
  • Page 13 CDX-MG6346ZH,MG6446ZH 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 CORE UNIT(STS UNIT) Large size SCH diagram Guide page Detailed page KEYBOARD UNIT...
  • Page 14 CDX-MG6346ZH,MG6446ZH EXTENSION UNIT...
  • Page 15 CDX-MG6346ZH,MG6446ZH...
  • Page 16 CDX-MG6346ZH,MG6446ZH...
  • Page 17 CDX-MG6346ZH,MG6446ZH...
  • Page 18 CDX-MG6346ZH,MG6446ZH...
  • Page 19 CDX-MG6346ZH,MG6446ZH 3.2 CD CORE UNIT(SERVO UNIT) CD CORE UNIT(SERVO UNIT) RF AMP/ AUTO POWER CONTROL (SERVICE) 2.5V CD DRIVER MOTOR PCB(B) M4 CARRIAGE CXB3178 DISC INSERT DETECT M5 SPINDLE CXM1120...
  • Page 20 CDX-MG6346ZH,MG6446ZH FOCUS/TRACKING CARRIAGE/SPINDLE DIGITAL SERVO DIGITAL SIGNAL PROCESSOR D/A CONVERTER 16.934MHz...
  • Page 21 CDX-MG6346ZH,MG6446ZH 3.3 CD CORE UNIT(STS UNIT) CD CORE UNIT(STS UNIT) SURE TRACK MEMORY CONTRO M1 : CXB3174 ELV SENSE Q1 : RPI-221 +5V REGULATOR M3 : CXB3175 MOTOR PCB 7.5V 9.0V MOTOR DRIVER LOAD SWITCH DOOR SWITCH MODE SWITCH...
  • Page 22 CDX-MG6346ZH,MG6446ZH 22/6R3 D/A CONVERTER TRACK RY CONTROLLER 4M DRAM RIVER MOTOR DRIVER...
  • Page 23 CDX-MG6346ZH,MG6446ZH Note:1. The encircled numbers denote measuring pointes in the circuit diagram. 2. Reference voltage REFOUT:2.5V - Waveforms 1 RFO 1 RFO 1 CH1: RFO 0.5V/div. 0.2µs/div. 0.5V/div. 0.5µs/div. 1V/div. 0.5ms/div. 2 CH2: MIRR Normal mode: play Test mode 5V/div. Normal mode: The defect part passes 500µs/div.
  • Page 24 CDX-MG6346ZH,MG6446ZH 3 CH1: FIN 1V/div. 8 CH1: TEY 8 CH1: TEY 0.5V/div. 0.5V/div. 5ms/div. 0.2s/div. 500µs/div. $ CH2: HOLD 6 CH2: FEY ! CH2: SD 5V/div. 0.1V/div. 0.5V/div. µ Normal mode: The defect part passes 800 Normal mode: AGC after focus close REFOUT→...
  • Page 25 CDX-MG6346ZH,MG6446ZH 8 CH1: TEY 8 CH1: TEY 0.5V/div. 0.5V/div. & SCKO 2V/div. 500ns/div. 10ms/div. 5ms/div. 9 CH2: TIN 9 CH2: TIN 0.5V/div. 0.5V/div. Test mode: 100 tracks jump(FWD) Normal mode: Play Play REFOUT→ REFOUT→ REFOUT→ REFOUT→ REFOUT→ ) CH1: RCH 2V/div.
  • Page 26 CDX-MG6346ZH,MG6446ZH 3.4 PCB UNIT(A,B,C,D,E), LOAD MOTOR PCB PCB UNIT(B) PCB UNIT(E) PCB UNIT(C) CPT230SCTD(CD) SWITCH PCB UNIT(A) CN802 CPT230SCTD(CD) CXB3177 PCB UNIT(D) LOAD MOTOR PCB...

  • Page 27: Pcb Connection Diagram

    CDX-MG6346ZH,MG6446ZH 4. PCB CONNECTION DIAGRAM SIDE A 4.1 EXTENSION 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 28 CDX-MG6346ZH,MG6446ZH SIDE B CN901 CN701...
  • Page 29 CDX-MG6346ZH,MG6446ZH 4.2 KEYBOARD UNIT SIDE A...
  • Page 30 CDX-MG6346ZH,MG6446ZH SIDE B...
  • Page 31 CDX-MG6346ZH,MG6446ZH 4.3 CD CORE UNIT(SERVO UNIT) SIDE A...
  • Page 32 CDX-MG6346ZH,MG6446ZH SIDE B...
  • Page 33 CDX-MG6346ZH,MG6446ZH 4.4 CD CORE UNIT(STS UNIT) CD CORE UNIT(STS UNIT) SIDE A...
  • Page 34 CDX-MG6346ZH,MG6446ZH SIDE B CD CORE UNIT(STS UNIT)
  • Page 35 CDX-MG6346ZH,MG6446ZH 4.5 MOTOR PCB(B) SPINDLE MOTOR MOTOR PCB(B)
  • Page 36 CDX-MG6346ZH,MG6446ZH CN301 CARRIAGE...
  • Page 37 CDX-MG6346ZH,MG6446ZH SIDE A 4.6 MOTOR PCB(A) MOTOR PCB(A) M1 CAM GEAR M3 ELV ELV SENSE CN201...
  • Page 38 CDX-MG6346ZH,MG6446ZH SIDE B MOTOR PCB(A) CN801...
  • Page 39 CDX-MG6346ZH,MG6446ZH 4.8 PCB UNIT(B) 4.7 PCB UNIT(D) PCB UNIT(D) S886 S887 CLAMP PCB UNIT(B) CN802...
  • Page 40 CDX-MG6346ZH,MG6446ZH 4.9 PCB UNIT(E) PCB UNIT(E) PCB UNIT(E) SIDE A SIDE B...
  • Page 41 CDX-MG6346ZH,MG6446ZH 4.10 PCB UNIT(C) Q881 PCB UNIT(C) S885 MAX DETECT D883...
  • Page 42 CDX-MG6346ZH,MG6446ZH 4.11 LOAD MOTOR PCB LOAD MOTOR PCB LOADING 4.12 PCB UNIT(A) PCB UNIT(A) D891 D892...

  • Page 43: Electrical Parts List

    CDX-MG6346ZH,MG6446ZH 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 44 CDX-MG6346ZH,MG6446ZH =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/16S102J RS1/16S511J RS1/16S471J RS1/16S561J RS1/16S471J RS1/16S103J RS1/16S331J RS1/16S273J RS1/16S331J CAPACITORS RS1/16S331J RS1/16S331J CEV4R7M35 RS1/16S331J CEV4R7M35 RS1/16S471J CEV4R7M35 RS1/16S471J CEV4R7M35 CCSRCH101J50 RS1/16S471J RS1/16S471J...
  • Page 45 CDX-MG6346ZH,MG6446ZH =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CL200PGCTU RS1/16S222J CL150DCD(AB) RS1/16S103J CL200PGCTU RS1/16S103J CL150DCD(AB) RS1/16S102J Diode UDZ2R7(B) RS1/16S163J Diode UDZ2R7(B) RS1/16S163J Switch CSG1043 RS1/16S101J Switch CSG1043 RS1/16S101J Switch CSG1043...
  • Page 46 CDX-MG6346ZH,MG6446ZH =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CKSRYB471K50 CKSQYB334K16 CKSQYB683K16 CCSRCH221J50 CKSRYB821K50 CKSQYB334K16 CKSRYB273K25 CKSQYB334K16 CKSQYB334K16 22µF/6.3V CCH1300 CKSQYB334K16 CKSQYB334K16 CKSQYB334K16 22µF/6.3V CCH1300 22µF/6.3V CCH1300 CEVL101M6R3 CEV101M10 CKSQYB334K16 CEV101M10...

  • Page 47: Adjustment

    CDX-MG6346ZH,MG6446ZH 6. ADJUSTMENT 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 CDX-MG6346ZH,MG6446ZH Ech → Xch 20mV/div, AC Grating waveform Fch → Ych 20mV/div, AC 0° 30° 45° 60° 75° 90°...

  • Page 49: General Information

    CDX-MG6346ZH,MG6446ZH 7. GENERAL INFORMATION 7.1 DIAGNOSIS 7.1.1 TEST MODE - CD Test Mode 2) Description of the Test Mode 1) Precautions on Adjustment • The unit employs a single voltage (+5V) for the regu- Adjustment of this unit is done in parallel with the CD lator, thus the reference potential of the signal is control unit (DEH-M7126ZH or a head unit conforming RFOUT (approximately 2.5V) rather than GND.
  • Page 50 • When ACC or Back up is off, the test mode is canceled. Note: The GA-NET BUS head unit(made by Pioneer) must be employed for controlling the test mode. Note: Sound is unavailable even after the tracking has been closed (this trouble results when the IC for the STS is not controlled in the test mode).
  • Page 51 CDX-MG6346ZH,MG6446ZH - CD Changer Mechanism Flowchart [Key] [4]+[6]+Reset Test Mode In Contents Display [CD]or[DISC] Source CD [ASEL] Mechanism Test In CD Test Mode CD Test Mode Initial State [ASEL] [TRK-] [TRK+] CAM+LOAD MOTOR Mecha Test Out CAM MOTOR ELV MOTOR LOAD MOTOR MOTOR FWD drive MOTOR REV drive...
  • Page 52 CDX-MG6346ZH,MG6446ZH - Operating Procedures for Ejecting a Clamped Disc Select CAM MOTOR using [1], then press the REV direction while the disc is being clamped (CAMSW state is 32). The CAMSW status indication sequentially changes through 32→33→23→22. When the disc to be ejected is not identical with the disc being clamped, select the [2] ELV MOTOR in the vicinity of where the display changes from 22 to 20, then match the elevation to the disc to be ejected according to the following procedures: After selecting ELV MOTOR, lower the elevation until the ELV position display becomes 01 (1st disc) using the REV direction.

  • Page 53: Disassembly

    CDX-MG6346ZH,MG6446ZH 7.1.2 DISASSEMBLY - Removing the upper case (not shown) 1. Remove the five screws, then remove the upper case. - Removing the Extension Unit (Fig. 1) 1. Remove the three screws B, then remove the side frame and holder. 2.
  • Page 54 CDX-MG6346ZH,MG6446ZH - How to remove the Tray Assy 3. Lift up the Tray assy to remove it. 1. Apply about 6V current to the Cam gear motor until * Be careful not to remove the Tray hooks from the Tray all holes match at the position (A) (elevation OK posi- assy.
  • Page 55 CDX-MG6346ZH,MG6446ZH 10. Remove the screw, pressure spring and collar. Lift Screw up the Carriage mechanism assy to remove it. Pressure spring * Screw tightening torque: 2.6kgfcm Collar Carriage mecha- nism Assy Fig. 7 - How to remove the Pickup unit Pulling spring E-shaped ring 1.
  • Page 56 CDX-MG6346ZH,MG6446ZH 8. Loosen the 2 screws. Remove the plate spring and the rack. Grease (Yellow: 9. Pull out the feed screw from the Pickup unit. PG-641) Plate spring Rack Feed screw Grease (White: KD-1) Grease (Yellow: PG-641) Pickup unit Fig. 10...

  • Page 57: Connector Function Description

    CDX-MG6346ZH,MG6446ZH 7.1.3 CONNECTOR FUNCTION DESCRIPTION Lch+ Rch+ AGND SWDACC B.UP Lch- Rch- 10 BUS GND 11 BUS- 12 BUS+ 13 ILL 14 NC...
  • Page 58 CDX-MG6346ZH,MG6446ZH 7.2 IC - Pin Functions (PD5540A) Pin No. Pin Name Function and Operation VDIN VD power supply sensor input DOORSW Door open position sense input NHIN NH-BUS dada input NHOUT NH-BUS dada output CLAMPSW Disk clamp sense input ELHOME Elevation sense input XSCK LSI clock output...
  • Page 59 CDX-MG6346ZH,MG6446ZH Pin No. Pin Name Function and Operation EXCE Chip enable output ILPOW Illumination power supply control output Power supply terminal VREF A/D converter reference voltage input AVSS A/D converter GND ADRMON DRAM memory remaining monitor input EREF DRAM A/D converter reference voltage input 76-78 PH1-3 Disc photo sense input...
  • Page 60 CDX-MG6346ZH,MG6446ZH BA5986FM Mute Level shift Level shift Level shift Level shift Stand-by MSM514400DP-60TS...
  • Page 61 CDX-MG6346ZH,MG6446ZH CXD2511R XRDE XEMP XQOK XWIH XSOE SDTO SDTI DATA LRCK WDCK WDCI LRCI DATI XRAS BCKI...

  • Page 62: Operations And Specifications

    CDX-MG6346ZH,MG6446ZH 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS EXPLANATION OF THE HAND MARKS Press momentarily. Press and hold for at least 3 seconds. 3SEC The CD Changer operates with the same controls used for the audio system. For oper- LOADING THE CD (1 of 2) ation, refer to the audio system section of the Owner’s Manual for your radio.
  • Page 63 CDX-MG6346ZH,MG6446ZH SELECTING A CD Press one of the buttons (1–6) to select a desired CD for play. Flashes orange • Green LED indicates CDs are stored and orange LED indicates currently selected 6 DISC IN-DASH CD CHANGER • While CDs are being changed, the LED flashes orange until CD changing has been completed, then it lights orange.
  • Page 64 CDX-MG6346ZH,MG6446ZH This product is equipped with two illumination colors, white and orange. ILLUMINATION You can select the desired illumination color. The illumination color changes each time you press and hold the eject Eject Button button for 3 seconds or longer. 6 DISC IN-DASH CD CHANGER 3SEC 8.2 SPECIFICATIONS...
  • Page 65 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-ZZS. FEB. 1999 Printed in Japan...

  • Page 66: Main Parts Locations

    CX-890 - CD Player Service Precautions 2. During disassembly, be sure to turn the power off 1. For pickup unit(CXX1311) handling, please refer since an internal IC might be destroyed when a con- to"Disassembly"(Page 21). nector is plugged or unplugged. During replacement, handling precautions shall be taken to prevent an electrostatic discharge(protection by a short pin).

  • Page 67: Circuit Descriptions

    CX-890 2. CIRCUIT DESCRIPTIONS EFM comparator EFM-IN FE-BAL 2.1 Preamplifier (UPC2572GS: IC101) envelope AGC-OUT TE-BAL The preamplifier processes pickup output signals to C AGC Detection generate signals to be sent to the servo, demodulator, RF-IN EFM-OUT and controller. The preamplifier with built-in photode- RF-OUT C.DEF tector converts signals from the pickup into intermedi-...
  • Page 68 CX-890 2) RF amplifier and RF AGC amplifier 4) DFCT (defect) circuit Photodetector outputs (A+C) and (B+D) are added, amplified and equalized in IC101, and output to the RFI DFCT signal detects mirror defect in discs, and is output terminal as RF signal. (Eye pattern can be checked at from Pin 33.
  • Page 69 CX-890 6) Focus-error amplifier REFOUT (+2.5V) The system outputs photodetector output (A+C) and CONDUCTANCE (B+D) as FE signal (A+C)-(B+D) from Pin 28 via the dif- 20kΩ C114 ference amplifier, then via the error amplifier. 10kΩ 390pF 9.3kΩ Low-frequency components of voltage FEY is: 10kΩ...
  • Page 70 CX-890 9) MIRR (mirror) circuit UPC2572GS MIRR signal shows ON and OFF track information. The Detection signal is output from Pin 31. (Peak) – (Bottom) The status of MIRR signal is as follows: RFIN Peak Laser beam ON track: MIRR = "L" MIRR Laser beam OFF track: MIRR = "H"...
  • Page 71 CX-890 2.2 Servo (UPD63702AGF: IC201) The servo consists of mainly two parts. The first part is the servo processing unit to equalize error signals and control track jump, carriage move, in focus, etc. The second part is the signal processing unit to perform data decoding, error correction, and interpolation.
  • Page 72 CX-890 When the conditions mentioned above are satisfied and focus is closed, the XSO terminal changes from "H" to REFOUT "L". Then, the microcomputer starts monitoring RFOK signal through L.P.F after 40 ms. LENS POSITION If the system judges RFOK signal as "L", the microcom- RELATIVE TO DISC puter takes actions, including protection.
  • Page 73 CX-890 2) Tracking servo system IC 201 UPD63702AGF The main equalizer of tracking servo is located in the IC301 UPD63702AGF. Fig. 11 shows block diagram of the TRACKING BA5986FM ERROR DIGITAL tracking servo. EQUALIZER LENS CONTROL R303 JUMP 10kΩ PARAMETERS R304 27kΩ...
  • Page 74 CX-890 b) Brake circuit Servo withdrawal will deteriorate during setting and track jump. Thus, the system uses the brake circuit to provide stable withdrawal to servo loop. The brake circuit detects the direction of lens move- ment, and outputs only drive signal in the opposite direction from the lens movement.
  • Page 75 CX-890 3) Carriage servo system Output from low-frequency components (lens position information) of the tracking equalizer is input to the car- IC201 UPD63702AGF riage equalizer by the carriage servo. After obtaining a IC301 certain gain, the system outputs drive signal from the BA5986FM FROM DIGITAL...
  • Page 76 CX-890 4) Spindle servo system The spindle servo has the following modes: IC 201 UPD63702AGF (1)Kick mode:To be used for accelerating disc rotation IC301 SPEED AND BA5986FM PHASE ERROR SIGNAL during setting. (2)Offset mode: DIGITAL a)To be used after completion of kick until comple BLOCK EQUALIZER R206...
  • Page 77 CX-890 2.3 Automatic Adjustment Function Constant RF level System With this system, all circuit adjustments are automati- microcomputer cally performed by using the preamplifier (UPC2572GS) Corrected Transfer RF signal voltage of amount and servo LSI (UPD63702AGF). All adjustments are of correction output circuit automatically performed whenever disc is inserted or...
  • Page 78 CX-890 5) Auto gain control (AGC) 2.4 Power Supply and Mechanism AGC adjustment is already used in the CD modules of Control the previous generation. This function automatically The power supply VM (7.5V) is produced from the adjusts servo loop gain of focus and tracking. power supply VD (9.0V) supplied from the extension Adjustment is made in the following steps: P.C.
  • Page 79 CX-890 2.5 STS(Sure Track System) Circuit By pooling the musical data read in from a compact disc into the memory, even if the pickup should go off track for some reason, the Sure Track System enables prevention of sound interruption during recovery (approximately 3 sec- onds) by continuing to output data from the memory.

  • Page 80: Mechanism Operations

    CX-890 3. MECHANISM OPERATIONS LOAD arms as shown in Fig.21. e)The LOAD arms push the disc loaded on the tray and 3.1 Disc Insertion open the tray hooks. f)When a disc is inserted, the disc interrupts the infrared a)The Cam gear rotates to the elevation OK position LED light from the photo transistors, and the Rubber (See "How to remove the Tray Assy"...
  • Page 81 CX-890 3.2 Elevation cal holes in the Main chassis via the rollers. e) When the elevation levers slide, the Stage Mech Assy a)The Cam gear rotates to the elevation OK position. moves up and down. b)The ELV motor rotates to slide the elevation lever via the gears.
  • Page 82 CX-890 3.4 Disc Clamp a)The Stage Mech Assy moves up and down to reach the height of the selected tray, using the elevation mechanism. b)The Cam gear rotates clockwise, the Carriage drive arm rotates, and then the Carriage Mech Assy moves toward the disc via the Carriage drive shaft.
  • Page 83 CX-890 3.7 Mechanism Lock c)With the movement of the Mech lock lever, the Mech lock lever (right) moves in a slanting direction as indi- a)Mechanism lock operation is to push the mechanism cated by the arrow in Fig. 25 to push the mechanism downward and toward the disc slot in order to keep forward and downward.
  • Page 84 CX-890 3.9 Stage Mechanism Lock d)For the left side of the Stage mech assy, in the mode described at the step d) on "3.7 Mechanism lock", the a)To prevent the Stage mech assy from rattling during Mech lock junction lever is driven to move the Stage disc play, which may adversely affect the vibration- lock lever (left).

  • Page 85: Disassembly

    CX-890 4. DISASSEMBLY and left) in the direction (C), remove the Tray holder. 3. Lift up the Tray assy to remove it. - How to remove the Tray Assy * Be careful not to remove the Tray hooks from the Tray 1.
  • Page 86 CX-890 10. Remove the screw, pressure spring and collar. Lift up the Carriage mech assy to remove it. Screw * Screw tightening torque: 2.6kgfcm Pressure spring Collar Carriage mech Assy Fig. 31 - How to remove the Pickup unit 1. Remove the pulling spring, torsion spring and E- Pulling spring shaped ring.
  • Page 87 CX-890 8. Loosen the 2 screws. Remove the plate spring and the rack. Grease (Yellow: 9. Pull out the feed screw from the Pickup unit. PG-641) Plate spring Rack Feed screw Grease (White: KD-1) Grease (Yellow: PG-641) Pickup unit Fig. 34 - How to remove the Carriage Motor Assy 1.
  • Page 88 CX-890 7. Loosen the 2 screws (D). Remove the Gear cover. Front 8. Loosen the 3 screws (E). Remove the Motor bracket assy. Motor bracket assy Gear cover Fig. 37 9. Remove the 5 polyslider washers, then gears and shaft. 10.
  • Page 89 CX-890 5. Remove the belt (large). Loading motor 6. De-solder at the points (B) and (C). Loading motor bracket 7. Loosen the 2 screws. Remove the Loading motor bracket. Belt Belt (large) (small) 8. Remove the belt (small). 9. Loosen the 2 screws. Remove the Loading motor. PCB (E) Fig.
  • Page 90 CX-890 (left) including the Loading motor. 8. Loosen the 4 screws. Remove the Motor bracket Photo interrupter Front assy and Photo interrupter. Motor bracket assy Fig. 42 9. Remove the 4 E-shaped rings (A) and 3 wash- ers (B). Mech lock junction lever 10.

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