Kenwood DP 49 Service Manual

Page 1

EMETZEIIEézo/Iszo KENWOOD
SERVICE MANUAL

©1990~1 PRINTED IN JAPAN '
851-4107-00 (0) S451

Panel Dressing plate Metallic cabinet Panel
(A29-0162-03I : J (BOB-26364) : J (A01~1850-O1I IA20-6011-02)
IA29-0163-03) : S (BOB-2640434) : S

KENV. (JOD v:

Knob (BUTTONMPOWER) Knob (OPEN/CLOSE) Knob ISTOP/PLAY/PAUSE)

IK27-2004-04) (K29-3918-04) (K29-3920-04I
Phone jack (LINE OUT) AC power cord* Photo is DP-49.
(E13-0244-05) (E30-I

Foot Miniature phone jack (SYNCHROI Power cord bushing
(J02~0366-15)X4 IE1 $018805) (J42-0083-05)

J : Japan made
6 : Singapore made
F : France made

*Refer to parts list on page 41.

Caution :

. . I The mechanism ass'y used with three types
DANGER : Lasenadamn when open an ' \ depending on the manufacturing location

9 AVOID DIRECT EXPOSURE To BEAM 3 V . (Japan, Slngapore, France).

Page 2

DP-49/ 1020/1520

CONTENTS

DISASSEMBLY FOR REPAIR
1. Removing the outside fittings ........ 4
2. Removing and installing the tray ..... 6
3. Removing the pickup (Japan made) ............. 8
3. Removing the pickup
(Singapore and France made) .......... 9
BLOCK DIAGRAM ..................................
CIRCUIT DESCRIPTION

1. Description of components
2. Test mode ...............................
3. Microprocessor : uPD75212ACW-185

MECHANISM OPERATION DESCRIPTION .......... 25

1. Tray OPEN/CLOSE operation ...................... 26
2. Pickup chassis UPIDOWN movement .

3. Gear installing position
ADJUSTMENT .......
VOLTAGE TABLE
PC BOARD .....................
SCHEMATIC DIAGRAM...

EXPLODED VIEW (MECHANISM)

:JAPAN MEDE .................................

EXPLODED VIEW (MECHANISM)

(X32-1610-XX: I04) ................ : SINGAPORE MADE ......................................... 38
4. RF AMP : CXA1081$ EXPLODED VIEW (MECHANISM)
(X32-1610-XX: IC1) ....................................... 16 : FRANCE MADE .............
5. Servo control : CXA1244S EXPLODED VIEW (UNIT)
(X32-1610-XX : ICZ) ....................................... 18 PARTS LIST .........................
6. Digital signal processor : CXD1167Q SPECIFICATIONS
(X32-1610-XX : IC3) ............ é .......................... 20 DP-49, DP-1020 ..
7. Custum IC: KASO1 (HIC) DP-1520 ..............
(X32-1610-XX : I09) .....
JAPAN MADE SINGAPORE MADE FRANCE MADE
DF-4s CONTROL UNIT x32-1510-10 (K,P) X32-1630-IO (K) -
X32-1610-21 (M)
X32-1610-71 (X)
MECHANISM ASS'Y X92-137005 X92-I400-05 (K) -
DP-1020 CONTROL UNIT X32-1610-11 (P) K32-1632-71(E,T) X32-1652-70 (E.T)
X32-1610-22 (M,Y)
X32-1610-72 (X)
MECHANISM ASS'Y X924370-05 X92-14oo-05 X92-1410-00
DP-1520 CONTROL UNIT X32-1610-12 (K) X32463041 (K) -
MECHANISM ASSY X92-1370-05 X92-I4oo-05 -
NOTE :

3models are written in this manual. Before using this manual, please check manufactur-
ing place and PC board ass'y number.
Control PC board ass'y (X32-) parts list (page 45)is written the parts for all of 3models.
Reler to comparision table in schematic diagram.

Page 16

DP-49/ 1020/ 1520

16

CIRCUIT DESCRIPTION

4. RF AMP : CXA1081S (X32-1610-XX : IC1)

General

The CXAIOBIS is an iC developed for use in Compact Disc
players. It incorporates a 3-5pm optical pickup RF output
amplifier, a locustng error amplifier a tracking error amplifier,
and other signal processing circuitry. such as focusOK, mir-
ror, detect, and EFM comparator cirCUitS, as well as a laser
diode APC (Automatic Power Control) circurt

Features

Operates on a Signal + 5 V power supply] as well as on a
:5 V dual-voltage power supply

Low power consumption (100 mW with 15 V, 50 mW
with + 5 V),

An APC Circuit which accepts either a P-sub or N-sub laser
diode.

A minimum of external parts reunited.

A disc defect detector Circuit for improved playabiliiy

4-1. Block diagram

Structure
Bipolar SIIiCOn monolithic IC

Functions

RF amplifier

Focus OK detector Circurt

Mirror detector cucurt

Tracking error ampiilier

Defect detector circurr

APC circuit

EFM comparator

Auto asymmetry control amuliiiei

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