Denon DCD-485 User manual

SERVICE 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

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) a

leakage 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.

AUDIO

DCD-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 system

RC-266

Others:

Mass: 3.4 kg

Mass: 85 g including batteries

AC 230 V, 50 HzPower Supply:

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

Power consumption: 11 W

2 to 20 kHz

Freqency Responese:

0.2 to 2.0 V

Output Voltage:

98 dB

105 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 dB

110 dB

103 dB (1 kHz)

Wow and Flutter:

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

SPECIFICATIONS

DCD-685

DISASSENBLY

Follow the procedure below in reverse order when reassembling

(Follow the procedure below in reverse order when reassembling)

1. Top Cover

1. Remove 4 screws

on both sides.

2. Remove 2 screws

on the Rear Panel.

3. Detach the Top Cover as shown in the fig.

2. Front Panel

1. Remove 1 screw

on the Rear Panel and

1 screw

fixing Support Bracket (b).

(only DCD-485)

2. Take off the Mecha Cover after removing

2 screws

Open the Tray by turning the Gear (a) clockwise,

then detach the Loader Panel.

3. Remove 3 screws

on the bottom edge of the

Front Panel.

4. Remove 2 screws

, at L/R ends of the Front

Panel and 1 screw

fixing Phone P.W.B.

Support Bracket

4. Main P.W.B.

1. Remove 5 screws

, 5 screws

on the Rear

Panel and detach it.

2. Remove 3 screws

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

fixing the CD Mecha.

2. Unplug Connectors (b), (c) and FFC from each

socket.

3. Release the FFC from the Clamper.

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 don’t push any other buttons.

Names of buttons Operation

OPEN / CLOSE * Loads or unloads DISC

PLAY * Emits laser light

* Repeats search operation (No DISC condition: While it’s

pressed

* Actuates focus servo (In case of DISC loaded

* Actuates tracking servo

STOP * Stops operation

PAUSE * Performs auto adjustment

MANUAL SEARCH

FORWARD / REVERSE

* Moves pickup

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 on”is displayed. DISC starts turning,and focus servo will be actuated. (Refer to Fig. 4, 5

FEO

TEO

DRF

TEO

SLD

FEO

TEO

¥¥¥ 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 signal’s amplitude

is 1.5Vâ0.3Vp-p. (Refer to Fig. 6

¥¥¥ Fig. 6 In “04 t on”

A ( A = 1.5 ± 0.3 VP-P

Wave-forms of each point

SPD

FEO

TEO

DRF

SLD

TEO

SLD

OPEN

SPD

TEO

DRF

SLD

TEO

When 12 cm DISC

start

When 8 cm DISC

start

When focus servo

Track search

(when forward

During PLAY

When the tray

OPEN

When 12 cm DISC

stop

When 8 cm DISC

stop

During PAUSE

Track search

(when reverse

Focus search

(no DISC

BLOCK DIAGRAM

DCD-685 only

DCD-485 only

DCD-685 only

RW SW

FOCUS

COIL Drv.

TRACKING

COIL Drv.

SLIDE

Mtr. Drv.

SPINDLE

Mtr Drv.

Mtr. Drv.

LA6995

IC104

PICK

FOCUS

COIL

TRACKIN

COIL

SLIDE

SPINDLE

L.DIODE

CD MECHA

KSL-2130CCM

INMOST-SW

OPEN-SW

CLOSE-SW

ASP

LA9241M

IC101

DSP

LC78625E

IC102

H/P AMP

IC315

DAC

PCM1702

IC602/603

D.FILTER

SM5841BS

IC703

µ-COM

µPD78044F

IC201

1U-3346-1

MAIN UNIT

MUTE

DRF

SUB

CODE

CD/RW

A/D INPUT

FSEQ

KEY

MATRIX

VFD

FL601

REMOTE

SENSOR

IC702

OPT.OUT 1U-3346-4

H/P UNIT

COTROL BUS

1U-3346-3

DISPLAY

1U-3346-2

POWER

UNIT

ROTALY

ENCODER

S616

CY271

CX271

±8V

-HB

+VDD

CONTROL

XRST2

DF&DAC

PCM1735

IC105

VCO

TC9246F

IC108

XRST1

D.MUTE

MD2

LD ON

POWER CONT.

M5290P

IC501

POWER

TRANS.

PT501

INLET

POWER SW

1U-3346-5

±5V

RESET

MUTE

CONTROL

PLL

BU2616F

IC107

CONTROL

DRV.MUTE

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 control

The 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 means

the control in the manufacturning plant.

Pin No. Description

IN/OUT

1 PD IC Vc IN

2 Vcc IN

3 E OUT

4 D OUT

5 A OUT

6 B OUT

7 C OUT

8 F OUT

KSS-213C

Lot 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 15

2 4 6 8 10 12 14 16

KSS-213C

Flexible flat cable connector

Pin No. Description

IN/OUT

9 GND IN

10 LD LD IN

11 VR IN

12 PD OUT

13 FCS (+) IN

14 TRK (+) IN

15 TRK (−)IN

16 FCS (−)IN

PDIC

987654321 16

TRACKING

LDPDIC

+2.5V +5V

SHORT LAND

FOCUSING

CAUTION:The soldered connecting portion must be bridged when removing CX161.

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