Kenwood DMCJ-3 Service Manual

POTABLE MD PLAYER

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TRACK NO. BATTERY

7 £

¢

Ni-MH/ALKALINE

COMPATIBLE

4

DC I N

HOLD

OPEN

PHONES

NotesNotes

System ............................Mini disc digital audio system

Read method .................. Noncontact optical reading system

(semiconductor laser)

Sampling frequency...... 44.1 kHz

Audio compression....... ATRAC (Adaptive Transform Acoustic Cording)

Number of channels...... 2 channels

Frequency response......20 Hz to 20,000 Hz (± 3 dB)

Wow & flutter ................ Less than unmeasurable limit

(± 0.001 % W.PEAK)

Input/Output terminal .. Remote control/Phones jack

Rated power output ......

......

..................

........

9 mW+9 mW

Power source

DC IN jack (4–5.1V)

: Specially provided AC adaptor

: Car battery adaptor (sold separately, DC-C70)
DC 1.5V : Commercially sold AA alkaline battery (LR-6) X 1
DC 1.2V : Specially provided rechargeable battery (NB-130) X 1

(Charging time : About 4 hours)

Battery life (Fully charge, with "auto PS" setting ON)

Specially provided rechargeable battery (NB-130) X 1

..............................................................................

Approx. 5 hours

Commercially sold AA alkaline battery (LR-6) X 1

.................................................................. Approx. 6 hours

• At 0.5mW+0.5mW output (32 Ω load ).

• Standard value during continuous use/charging in an temperature of

25˚C.

• Time of use may vary depending on battery maker, battery
type,

use

environment, and temperatute.

• Time will be shorter when "PS off" Mode is set.

Dimensions (not including protruding parts)

W :99 mm (3-7/8")
H :17 mm (11/16")
D :75 mm (2-15/16")

Weight (Net) ................ 115g (0.25 lb)

not including the accessory rechargeable batter
140g (0.31 lb)
including the accessory rechargeable battery

DMC-J3

SERVICE MANUAL

Knob*
(K29-)

© 1998-3/B51-5411-00 (K/K) 3163

Miniature phone jack
(E11-0381-05)

Knob
(K29-6828-03)

Knob*
(K29-)

Dressing panel*
(A21-)

Knob
(K29-6827-03)

Front glass
(B10-2407-04)

Knob*
(K29-)

Lid assy*
(A53-)

Battery cover*
(A09-)

SPECIFICATIONS

Dressing panel*
(A21-)

DC jack
(E03-0357-05)

Blind plate
(F19-1086-04)

* Refer to parts list on page 17.

1. KENWOOD follows a policy of continuous advancements in development, For reason specifications may be changed without notice.

2. The full performance may not be exhibited in an extremely cold location (under a water-freezing temperature).

In compliance with Federal Regulations, following are reproduc­tions of labels on, or inside the product relating to laser product
safety.

KENWOOD-Corp. certifies this equipment conforms to DHHS
Regulations No. 21 CFR 1040. 10, Chapter 1, Subchapter J.

DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.

DMC-J3

Action

÷

Insert a MD into the unit.

÷

Replace the disc with a

prerecorded

MD when

playing it back.

÷

Replace the MD.

÷

Replace the MD.

÷

Wait until the inside of the unit
cools down.

Symptom Cause Remedy

÷

The disc holder is not securely closed.

÷

The battery is depleted.

÷

HOLD status is engaged.

÷

The volume is at minimum level.

÷

The remote control or headphones are
disconnected.

÷

HOLD status is engaged.

÷

The battery is depleted.

÷

The remote control or headphone plug is
not securely inserted.

÷

The
The MD disc has, a scratch or apoor recording

disc holder is not securely closed.

÷
÷

The unit is in a place where there is
excessive vibration.

÷

You are using commercial rechargeable

battery.

÷

The unit has become hot because of
exposure to direct sunlight etc.

÷

You are using another AC adaptor than
the accessory adaptor.

÷

The AC adaptors has become dis

connected.

Unit fails to
turn ON.

÷

Close disc holder securely.

÷

Charge the battery.

÷

Deactivate HOLD status.

÷

Increase the volume.

÷

Insert plug securely.

÷

Deactivate HOLD status.

÷

Charge the battery.

÷

Insert plug securely.

÷

Close disc holder securely.

÷

Replace the MD.

÷

Move the unit to a place
where there is little vibration.

or set to "PS off" .

÷

Use the special rechargeable
battery (NB-130)

÷

Wait until the unit has cooled
to normal temperature.

÷

Use the accessory AC adaptor.

÷

Connect the AC adaptor

securely.

There is no
sound.

The unit does
not respond to
key operation.

Sound skips.

Troubleshooting

Message Meaning

÷

There is no MD in the unit.

÷

Nothing is recorded on this MD.

÷

The * UTOC contents are faulty.

÷

The disc is scratched or damaged, so
Playback is not possible.

÷

The inside of the unit has become hot
during charging.

"BLANK "

"noDISC"

"LoBATT "

"ERROR "

Meaning of display messages

* UTOC : UTOC (User's Table of Contents) refers to special data put on a recordable MD,

other than TOC data.. UTOC contains writable data such as number of songs,
performance time, and other written data.

Battery does
not charge.

Resetting the unit

The unit may not operate normally due to faulty handling or adverse power current
effects caused by impact, excessive static electricity load, or power drop during use.

If this occurs, take the following measures.

1Pull the AC adaptor out of the

power outlet.

2Remove the rechargeable

battery.

3Wait about 30 seconds.
4Plug the AC adaptor into the

power outletand operate the
unit.

To household outlet

CONTENTS / ACCESSORIES

Contents

SPECIFICATIONS.........................................Top cover

CONTENTS / ACCESSORIES ....................................2

CONTROLS.................................................................3

CIRCUIT DESCRIPTION.............................................4

Accessories

PC BOARD ................................................................11

SCHEMATIC DIAGRAM............................................12

EXPLODED VIEW .....................................................15

PARTS LIST...............................................................17

AC adapter (1) *
(W09-)

AC plug adapter (1)
(E03-0115-05)

Remocon (1)
(A70-1186-05)

Caution

Beware of condensation

When water vapor comes into contact with the surface of cold materi­al, water drops are produced.
If condensation occurs, correct operation may not be possible, or the
unit may not function correctly.
This is not a malfunction, however, and the unit should be dried.
(To do this, turn the POWER switch ON and leave the unit as it is for
several hours.)

Be especially careful in the following conditions:

• When the unit is brought from a cold place to warm place, and there is
a large temperature difference.

• When a heater starts operating.

• When the unit is brought from an air-conditioned place to a place of
high temperature with high humidity.

• When there is a large difference between the internal temperature of
the unit and the ambient temperature, or in conditions where conden­sation occurs easily.

2

Batteries : NB130 (1)
(W09-1237-05)

Stereo headphone (1) *
(W01-)

Carrying case (1)
(W01-0938-05)

* Refer to parts list on page 17.

CONTROLS

Names and functions of parts

HOLD indicator

Using the Clip

÷ The remote control unit can be clipped

to a bag or a pocket.

¢ (SKIP-SEARCH)key
*Fast-forward mode

B.B (Bass boost) indicator

Main Unit

Remote Control

Functions marked with an asterrisk (*) indicate operations performed in SHIFT
Mode.

Play indicator

Track mode indicator

Remaining
battery life
indicator

OPEN knob

PHONES jack

Disc Holder

SHIFT indicator

Play indicator

Volume indicator
Playback

status indicator

Repeat mode indicator

P: One Track Repeat mode
PALL : All Tracks Repeatmode

ALL : Random mode

Remaining battery
life indicator

Character infromation
indicator

Clip

Volume UP key
*DISPLAY mode

Volume DOWN key
*BASS BOOST mode

HOLD switch

Clip

Press and release.

4 (SKIP-SEARCH) key
*Fast-reverse mode

PHONES jack

SHIFT key

LCD

38 (PLAY/PAUSE

-PLAY MODE) key

* Repeat play mode
* Random play mode

7 (STOP/OFF) key

Battery cover

( (VOL. DOWN) key

7 (STOP/ OFF) key

9 (VOL. UP) key

LCD

3 ( PLAY / PAUSE) key

¢ (Skip up)

key

DC IN jack
(Extemal power
jack)

4 (Skip
down) key

HOLD knob

DMC-J3

HOLD

PHONES

TRACK NO. BATTERY

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COMPATIBLE

DC I N

B.B.

SHIFT

ALL

F

DISPLAY

UP

BASS BOOST

DOWN

HOLD

3

MAX

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PLAY OPERATION VOLUME

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BATTERY

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TITLE/TRACK NO./TIME

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MD

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VOLUME

3

4

DMC-J3

1. Main microprocessor : uPD784035GC810 (X33 : IC5)

1-1 Microprocessor periphery block diagram

Power supply

P_AD_BATT1
P_AD_BATT2 A / D input
P_AD_ADP
P_ADON
P_CHG
P_CHGOK

Other

P_TEST0
P_TEST1
P_NO_JTYPE
P_HOLD
P_WUP
P_BEEP

CXD2655R, CXA2523AR

SYSTEM

P_XRST
P_XLAT, P_SWDT, P_SRDT, P_SCLK
P_XINT, P_ADSY
P_SENS
P_FOK
P_SYS_POWER, P_SP
P_XSTBY

Control

Headphone AMP

P_HP_POWER

Motor drive

P_CTL, P_PASS
P_SPOUT (D / A output )
P_SPIN (A / D input )

uPD784035GC810

u-COM IC5

Mechanism

Mechanism

(D40-1576-01)

Remocon

P_RLCD_DT

Pickup

P_LDON

(T25-0071-05)

Display

P_MLCD_CK
P_MLCD_DT
P_MLCD_CD
P_MLCD_CS

Operation

CIRCUIT DESCRIPTION

Unit

P_EP_CLK
P_EP_CS
P_EP_DO
P_EP_D

Data

AK93C45A

Serial control

P_AD_KEY0
Unit key

P_AD_KEY1
Remocon key

CIRCUIT DESCRIPTION

1-2 Pin description

Pin No. Pin Name I/O Description

1 /XLAT O Control latch to CXD2655R
2 /XRST O Reset to CXD2655R
3 NC O No use
4 /LDON O The laser of the pickup output on/off. L:output.
5 BEEP O Beep sound output.
6 NC O No use
7 /RESET – Microprocessor reset.
8 VDD – Power supply (+5V).

9,10 X1,2 I Main clock generation(12MHz).

11 VSS – GND
12 /XSTBY O Standby signal output.
13 CTL O The feed motor drive signal output.
14 PASS O Power save by-pass signal for DC/DC
15 /SP O Inverted switch port of the power supply to system and IC .

16,17 NC O No use

18 /CHGOK I Rechargeable battery OK signal input port. H:NG
19 CHG O Rechargeable current control output. H:charge on.
20 SYS POWER O The switch port of the power supply to system and IC .
21 MLCD C/D O Display driver command check signal output.
22 MLCD C/S O Display driver chip select signal output.
23 RLCDDATA O Remote control display driver serial control data.

24 PWS O Headphone amp output selector. H:output.
25-41 – O No use
42,43 TEST1,0 I Test mode.

44 NC O No use

45 VSS – GND

46 TEST I Device test.

47 NC O No use

48 EPCLK O E2ROM serial control clock output.

49 MLCD CLK O Display driver clock signal output.

50 – O No use

51 MCLD DATA O Display driver data signal output.

52 EPCS O E2ROM serial control latch output.

53 EPDI O E2ROM serial control data output.

54 EPDO I E2ROM serial control data input.

55 VDD – Power supply (+5V).
56,57 KEY0,1 I A/D voltage matrix key input. key0=unit,key1=:remocon).

58 ADP I A/D external power supply voltage check input.

59 BATT1 I A/D minus power supply data input.

60 BATT2 I A/D pulse internal power supply data input.

61 SPIN I A/D spindle drive voltage input.

62 /HPLD I HPLD switch check output. H:HOLD off.

63 ADON O AVREF output.

64 AVDD – Power supply (+5V) for A/D.

65 AVREF1 – Reference voltage for A/D.

66 AVSS – GND for A/D.

67 NC O No use

DMC-J3

5

2.8

2.4

2.0

1.6

1.2

0.8

0.4

0

KEY OFF

VOL. UP

VOL. DOWN

¢

4

STOP

PLAY

2.8

2.73

2.47

2.1

1.76

1.47

1.18

0.91

0.66

0.26

0

KEY OFF

REMOCON PRESENCE

SHIFT

VOL. DOWN

VOL. UP

4

¢

3 PLAY



7 / POWER OFF

KEY OFF

DMC-J3

Pin No. Pin Name I/O Description

68 SPOUT O D/A spindle drive voltage output.
69 AVREF2 – Reference voltage for D/A.
70 AVREF3 – GND for D/A.
71 NO JTYPE I Destination selector. L:Japan.
72 VORG. I No use
73 /XINT I Interrupt from XINT port of CXD2655R. L:interrupt.
74 /ADSY I Interrupt from ADSY port of CXD2655R. L:interrupt.
75 FOK O Focus ok signal input. H:focus on.
76 SCLK O Control clock to CXD2655R.
77 /WUP I Interrupt from microprocessor wakeup signal. L:interrupt.
78 SENS I SENSE monitor input.
79 SRDT I Data input from CXD2655R.
80 SWDT O Data output to CXD2655R.

CIRCUIT DESCRIPTION

1-3 VOLTAGE MATRIX ( , pin)

KEY 0

UNIT 6 KEYS

VOLTAGE [V] KEY FUNCTION

6

5756

5756

KEY 1

REMOCON 7 KEYS

VOLTAGE [V]