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

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