denon stereo cd player dcd-485-dcd-685 parts and service manual

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Service Manual

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  • BSERVICE MANUAL

    Some illustration using in this service manual is slightly from the actual set.

    MODEL

    DCD-485/685

    STEREO CD PLAYER

    DCD-485

    DCD-685

    Hi-Fi Component

  • 2

    SAFETY PRECAUTIONS

    SPECIFICATIONS

    SAFETY PRECAUTIONS

    The following check should be performed for the continued prtection of the customer and service technician.

    LEAKAGE CURRENT CHECK

    Before reterning the unit to the customer,make sure you make either (1) aleakage current check or (2) a line to chassis resistance check. If the leakage current exceeds 0.5 miliamps, or if hte resistance from chassis to either side of the power cord is less than 460 kohms, the unit is detective.

    AUDIODCD-485

    DISCS

    REMOTE CONTROL UNIT

    FUNCTIONS AND DISPLAY

    GENERAL CHARACTERISTICS

    434 (W) x 100 (H) x 285 (D) mm

    2 channels

    Dimensions:

    54.5 (W) x 140 (H) x 24.8 (D) mmExternal Dimensions:

    Number of Channels:

    Automatic searchi, programmed playback, repeat playback, manual search, auto space,time mode, auto edit, dimmer, random playback, pitch control (DCD-685 only)

    Functions:

    Remote Control System:

    Track number, time, music calendar and engaged modesDisplay:Headphones jack

    Infrared pulse systemRC-266

    Others:

    Mass: 3.4 kg

    Mass: 85 g including batteries

    AC 230 V, 50 Hz Power Supply:

    3V DC; two R6P (standard size AA) dry cell batteriesPower Supply:

    Power consumption: 11 W

    2 to 20 kHzFreqency Responese:

    0.2 to 2.0 VOutput Voltage:

    98 dB105 dB

    Dynamic Range:Signal to Noise ratio:

    0.003 % (1 kHz)Harmonic distortion:102 dB (1 kHz)Separation:Below measurable limit:

    Compact Disc format

    ( 0.001% W. peak)

    3.6 kg

    12 W

    100 dB110 dB

    103 dB (1 kHz)Wow and Flutter:

    Specifications and design are subject to change without notice for purpose of improvement.

    SPECIFICATIONS

    DCD-685

  • 3

    DISASSENBLY

    Follow the procedure below in reverse order when reassembling(Follow the procedure below in reverse order when reassembling)

    1. Top Cover1. Remove 4 screws 1 on both sides.2. Remove 2 screws 2 on the Rear Panel.3. Detach the Top Cover as shown in the fig.

    2. Front Panel1. Remove 1 screw 3 on the Rear Panel and 1 screw 4 fixing Support Bracket (b). (only DCD-485)2. Take off the Mecha Cover after removing 2 screws 5 .

    Open the Tray by turning the Gear (a) clockwise,then detach the Loader Panel.

    3. Remove 3 screws 6 on the bottom edge of theFront Panel.

    4. Remove 2 screws 7 , at L/R ends of the Front

    Panel and 1 screw 8 fixing Phone P.W.B.

    Support Bracket

  • 4

    4. Main P.W.B.1. Remove 5 screws 10 , 5 screws 11 on the Rear

    Panel and detach it.2. Remove 3 screws 12 fixing the Main P.W.B.3. Unfasten 1 P.W.B. Holder to detach the Main

    P.W.B.

    4. Remove 1 screw and 2 screw fixing the

    Power P.W.B.5. Unfasten 1 P.W.B. Holder to detach the Power

    P.W.B.

    3. CD Mecha. Unit

    1. Remove 4 screws 9 fixing the CD Mecha.2. Unplug Connectors (b), (c) and FFC from each

    socket.3. Release the FFC from the Clamper.

  • 5

    CD TEST MODE

    z Setting of the test mode How to start the test mode: Turn on the power in the condition that CLOSE (Pin No. 3 ) and OPEN (Pin No. 4 ) of CX053 are being shorted. ( 01 is indicated on the DISPLAY) To exit from the test mode, turn off the power. (Refer to Fig. 1 Test Point Layout)

    Fig. 1 Test Point Layout * Laser light of the pickup is always emitted regardless of DISC loading in the test mode.

    You may lose your eyesight if you look into the laser directly.So be careful enough when operating in the test mode.

    z Used DISC: A-BEX TCD784

    z Explanation of each button * Use only the buttons described below for operations while in the test mode,

    and dont push any other buttons.Names of buttons OperationOPEN / CLOSE * Loads or unloads DISCPLAY * Emits laser light

    * Repeats search operation (No DISC condition: While its pressed) * Actuates focus servo (In case of DISC loaded) * Actuates tracking servo

    STOP * Stops operationPAUSE * Performs auto adjustmentMANUAL SEARCHFORWARD / REVERSE

    * Moves pickup

  • 6

    z How to check the test mode( 1 ) DISC discrimination, adjustment

    * Insert DISC, and press the PAUSE button. * 06 Adj is displayed, and discrimination of DISC size 8 cm/12 cm, discrimination of

    DISC reflectance (CD, CD-R/CD-RW), adjustment of focus, tracking offset,and EF balance will be performed. (Adjusted values are not displayed: Refer to Fig. 2, 3)

    Fig. 2 DISC discrimination, adjustment Fig. 3 (Case of CD-RW) Adjustment of EF balance

    * After completing the discrimination and adjustment, it becomes stop condition. * Once discrimination of DISC has been carried out in the 06 Adj mode, discrimination of

    size and reflectance is no longer made, and only adjustment will be performed.

    ( 2 ) Checking of servo state * Press the PLAY button after performing above (1) DISC discrimination, adjustment. * 02 L on is displayed, and the laser will start to light. (The pickup may vibrate with a rattling noise if DISC has been loaded, but this is not abnormal.) * Press the PLAY button again. * 03 F onis displayed. DISC starts turning,and focus servo will be actuated. (Refer to Fig. 4, 5)

    FEO

    TEO

    HF

    DRF

    TEO

    TB

    SLD

    FEO

    TEO

    TEO

    HF

  • 7

    Fig. 4 In 03 F on Fig. 5 In 03 F on

    * Press the PLAY button again. * 04 t on is displayed. Tracking, CLV, and slide servo will be actuated. * Monitor HF signal using the test terminals, HF of CX053 (Pin No. 1 ) and

    VC of CX063 (Pin No. 5 : 2.5V ref. signal). Check that the signals amplitudeis 1.5V0.3Vp-p. (Refer to Fig. 6)

    Fig. 6 In 04 t on

    A ( A = 1.5 0.3 VP-P )HF

  • 8

    Wave-forms of each point

    SPD

    SPD

    FEO

    TEO

    DRF

    HF

    SLD

    TEO

    SLD

    OPEN

    CLOSE

    SPD

    SPD

    TD

    TEO

    HF

    DRF

    SLD

    TEO

    FD

    When 12 cm DISCstart

    When 8 cm DISCstart

    When focus servoon

    Track search (when forward)

    During PLAY

    When the trayOPEN

    When 12 cm DISCstop

    When 8 cm DISCstop

    During PAUSE

    Track search (when reverse)

    Focus search (no DISC)

    p

  • 9

    BLOCK DIAGRAM

    DCD-

    685

    only

    DCD-

    485

    only

    DCD-

    685

    only

    RW SW

    FOCU

    SCO

    IL D

    rv.

    TRAC

    KING

    COIL

    Drv

    .

    SLID

    EM

    tr. Dr

    v.

    SPIN

    DLE

    Mtr

    Drv.

    LOAD

    ING

    Mtr.

    Dr

    v.

    LA69

    95

    IC10

    4

    PICK UP

    FOCU

    SCO

    IL

    TRAC

    KIN

    COIL M

    SLID

    E

    M

    SPIN

    DLE

    M

    LOAD

    ING

    L.DI

    ODE

    CD M

    ECHA

    KSL-

    2130

    CCM

    INM

    OST

    -SW

    OP

    EN

    -SW

    CLO

    SE-SW

    ASP

    LA92

    41M

    IC10

    1

    DSP

    LC78

    625E

    IC10

    2

    H/P

    AMP

    IC31

    5

    DAC

    PCM

    1702

    IC60

    2/60

    3

    D.FI

    LTER

    SM58

    41BS

    IC70

    3 -CO

    MP

    D780

    44F

    IC20

    1

    1U-3

    346-

    1M

    AIN

    UN

    IT

    MUT

    E

    MUT

    E

    DRF

    SL

    SUB

    CODE

    CD/R

    W

    A/D

    INPU

    T

    FSEQ

    KEY

    MAT

    RIX

    VFD

    FL60

    1RE

    MO

    TESE

    NSO

    RIC

    702

    OPT

    .O

    UT1U

    -334

    6-4

    H/P

    UNIT

    COTR

    OL

    BUS

    1U-3

    346-

    3

    DIS

    PLAY

    V R

    1U-3

    346-

    2PO

    WER

    UNIT

    RO

    TALY

    ENCO

    DER

    S616

    CY27

    1

    CX27

    1

    8V

    -HB

    +V D

    D

    CONTROL

    XRST2

    DF&D

    ACPC

    M17

    35IC

    105

    VCO

    TC92

    46F

    IC10

    8 XRST1

    D.MUTE

    MD

    2

    LD O

    N

    POW

    ER CO

    NT.

    M52

    90P

    IC50

    1

    PO

    WE

    R

    TR

    AN

    S.

    PT

    501

    AC INLE

    T

    POW

    ER SW

    1U-3

    346-

    5

    5V

    RESE

    T

    MUT

    ECO

    NTRO

    L

    PLL

    BU26

    16F

    IC10

    7

    CONT

    ROL

    DRV.

    MUT

    E

  • 10

    NOTE FOR HANDLING OF LASER PICK-UP

    Description of the Components

    Label

    Pin Connector

    year(last figure)

    day month quality control No.Lot No.

    lop No.

    Oct. Nov. and Dec. are expressed by alphabetical letters of X, Y and Z.

    10 1 10-1

    LD drive currentquality controlThe expressed unit is by mA, with omission of the decimal point as for example, 56.5mA will be ex-pressed as 565, but the head of English letter meansthe control in the manufacturning plant.

    Pin No. Description IN/OUT1 PD IC Vc IN2 Vcc IN3 E OUT4 D OUT5 A OUT6 B OUT7 C OUT8 F OUT

    KSS-213CLot No.

    lop

    Slide rack

    OP Slide base

    Object Lens Actuator cover

    PAL-2 Flexible board

    Label

    Flexible flat cable connector

    Z-axis

    Y-axis(Tangental direction)

    X-axis(Radial direction)

    +Z-axis direction

    +X-axis direction

    +Y-axis direction

    1 3 5 7 9 11 13 152 4 6 8 10 12