SPECIFICATIONS
PORTABLE MD PLAYER
DMC-K3
SERVICE MANUAL
© 1999-1/B51-5503-00 (K/K) 2837
In compliance with Federal Regulations, following are reproduc-
tions 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.
System ........................... Mini disc digital audio system
Read method ................. Noncontact optical reading system (semicon-
ductor laser)
Sampling frequency ...... 44.1 kHz
Audio compression ....... ATRAC (Adaptive Transform Acoustic Coding)
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 (45.1V)
: Specially provided AC adaptor
: Car battery adaptor (sold separately, DC-C70)
DC 1.5V : Commercially sold AA alkaline battery (LR-6)
× 1
DC 1.2V : Specially provided rechargeable battery (NB-150)
× 1
(Charging time : About 3 hours)
Battery life (Fully charge, with "PS on" setting ON)
Specially provided rechargeable battery (NB-150)
× 1 ......... Approx. 7 hours
Commercially sold AA alkaline battery (LR-6)
× 1 ............... Approx. 8 hours
÷ At 0.5mW+0.5mW output (32 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
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).
Notes
Notes
KENWOOD
CORPORATION
MADE
IN
JAPAN
VOLUME
+
OPEN
DC
IN
4
-
5.
1V
PHONES
BATTERY
(
L6
.R6
.AA
.AM3
)
1
.
5V
NI
-
MH
BATTERY
1
.
2V
IN
OPEN
HOLD
Lid assy
(A53-2123-03)
Dressing panel
(A21-3741-04)
Knob
(K29-7476-03)
Knob
(K29-7478-04)
Knob
(K29-7477-04)
Battery cover
(A09-1118-03)
Miniature phone jack
(E11-0381-05)
Metallic cabinet assy
(A01-3664-03)
Escutcheon
(B07-2443-01)
DC jack
(E03-0357-05)
Knob
(K29-7475-03)
Illustration is DMC-K3(S).
DMC-K3
2
CONTENTS / ACCESSORIES
AC adapter (1) *
(W09-)
Remotcon (1)
(A70-1258-05)
Stereo headphone (1) *
(W01-)
Stereo headphone (1) *
(W01-0963-05)
* Refer to parts list on page 17.
Batteries : NB150 (1)
(W09-1267-05)
Carrying case (1)
(W01-0938-05)
Contents
Accessories
Caution
SPECIFICATIONS .........................................Top cover
CONTENTS / ACCESSORIES ....................................2
CONTROLS .................................................................3
DISASSEMBLY FOR REPAIR .....................................4
CIRCUIT DESCRIPTION .............................................5
PC BOARD ..................................................................9
SCHEMATIC DIAGRAM ............................................11
EXPLODED VIEW .....................................................15
PARTS LIST...............................................................17
Action
÷ Insert a MD into the unit.
÷ Replace the disc with a
prerecorded MD when
playing it back.
÷ Replace the MD.
÷ Replace the MD.
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 head-
phones are disconnected.
÷ HOLD status is engaged.
÷ The battery is depleted.
÷ The remote control or head-
phone plug is not securely in-
serted.
÷ The disc holder is not securely
closed.
÷ The disc is scratched or dam-
aged or the recording is not
good.
÷ The unit is in a place where
there is excessive vibration.
÷ You are using commercial re-
chargeable battery.
÷ The unit has become hot be-
cause of exposure to direct
sunlight etc.
÷ You are using another AC
adaptor than the accessory
adaptor.
÷ The AC adaptors has become
disconnected.
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 vibra-
tion or set to "PS off".
÷ Use the special recharge-
able battery (NB-150)
÷ Wait until the unit has
cooled to normal tempera-
ture.
÷ Use the accessory AC
adaptor.
÷ Connect the AC adaptor
securely.
There is no
sound.
The unit does
not respond
to key opera-
tion.
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 dam-
aged, so playback is not pos-
sible.
"BLANK "
"noDISC"
"ERROR "
Meaning of display messages
*UTOC: A recordable MD has an area for recording so-called UTOC
(User's Table of Contents) data. The UTOC contains number
of tracks, playing time, written data, and other rewritable
information.
Battery does
not charge.
Resetting the unit
This system uses a microcomputer so it may malfunction due to external
noise or interference. In such a case, unplug the power cord and remove the
batteries, then plug the power cord again and insert the batteries again.
Beware of condensation
When water vapor comes into contact with the surface of cold materi-
al, 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 conden-
sation occurs easily.
DMC-K3
3
CONTROLS
KENWOOD
CORPORATION
MADE
IN
JAPAN
VOLUME
+
OPEN
DC
IN
4
-
5.
1V
PHONES
BATTERY
(
L6
.R6
.AA
.AM3
)
1
.
5V
NI
-
MH
BATTERY
1
.
2V
IN
OPEN
HOLD
M
O
D
E
^
HOLD
HOLD switch
6 (Play/pause) key
5 (Volume up) key
4 (Skip down) key
HOLD indicator
Main Unit
Play indicator
Track number indicator
Battery
indicator
7 (Stop/off) key
Charge key
LCD
DC IN jack
(Extemal power jack)
Battery cover
(Volume down) key
OPEN slider
¢ (Skip up) key
PHONES jack
Disc Holder
HOLD
Using the Clip
÷ Clip the remote control unit to the
edge of your bag or pocket.
Remote Control
Clip
Press and release.
PHONES jack
Hand strap
attaching hole
¢ (Skip up) key
4 (Skip down) key
MODE key
LCD
6 (Play/pause) key
7 (Stop/off) key
Charge key
HOLD switch
+ (Volume up) key
(Volume down) key
The mode changes each time the
MODE key is pressed.
The mode changes each time the
MODE key is pressed.
MODE key (Only by remote control operation)
1 Fast forward/fast reverse
(search)
2 Changing the display mode
3 Play Mode
4 Changing the tone
(BASS BOOST)
5 Original display
1 AUTO PLAY
2 AUTO POWER SAVE
3 Operating tone (Beep)
4 Original display
Use this key to set playback-related features and other convenient
functions. Please also read "Playback (Application)" and "Convenient
functions" for details.
When the MODE key is held de-
pressed for more than 2 seconds:
÷ To change one of the above set-
ups after returning to the original
display, restart from the step of
pressing and holding the MODE
key for more than 2 seconds.
DMC-K3
4
DISASSEMBLY FOR REPAIR
1
1
1
1
2
1
1
1
3
3
7
3
3
6
5
4 x2
x2
S1
How to Remove Case
1. Remove 7 screws(
1).
2. Slide the case to the opposite side of the battery case(
2).
How to Check PCB
3. Rmove 7 screws(
3x5,4x2) and unsolder the corner of pcb(5).
4. Connect the ground wire to the LCD mounting hardware and the frame of the unit(
6).
5. Fix the switch 1 (ON mode) by the tape(
7). And check the unit with standing it.
5
DMC-K3
CIRCUIT DESCRIPTION
1. Main microprocessor : uPD784036GC831 (X33 : IC5)
1-1 Microprocessor periphery block diagram(X33)
1-2 Pin description
IC9
IC7
RE/SERVO
CXA2523AR
DSP/ATRAC
CXD2655BR
SERIAL XLAT XRST FOK SQSY SENS
Q6
BEEP MIXER
IC5
Q17
XSTBY
BEEP
BASS BOOST
BassBoost
IC12
SEIN
MUTE SW
IC8
u-COM
HEAD PHONES AMP
MOTOR DRIVER
S1-S3
uPD784036GC
PSW
LA4801V
BD6601KVT
EPDO
EPDI
IC10
BEMFU,V,W
EPCS
E2PROM
EPSK
AK93C45AV
ED1
com
SEG1-19
LCD(SET)
SP PWS CHG1 CHG2 ADP CHGOK BATT
POWER SUPPLY CONTROL/RECHARGEABLE CIRCUIT
Pin No.
Name
I/O
Description
Function
H/L
1
XLAT
O
DSP IC (CXD2655BR) LATCH signal
2
XRST
O
DSP IC (CXD2655BR) HARD RESET signal
3
XSTBY
O
RF/SERVO IC (CXA2523AR) STAND BY signal
4
LDON
O
PICK UP LASER on/off signal
L: LIGHTING
H: NON LIGHTING
5
BEEP
O
BEEP output/ to HP AMP
6
BASS BOOST
O
Analog bass boost control
L: BOOST ON
H: BOOST OFF
7
RESET
µ-com RESET
8
VDD
µ-com +power supply
9
X2
O
µ-com SYSTEM CLOCK OSC port (out)
10
X1
I
µ-com SYSTEM CLOCK OSC port (in)
11
VSS
µ-com GND
12
LCD DATA
O
LCD remocon display data serial output
13
BEMFW
I
SLED MOTOR comparator signal(W)
14
BEMFV
I
SLED MOTOR comparator signal(V)
15
BEMFU
I
SLED MOTOR comparator signal(U)
16~18
S1~3
O
SLED MOTOR control signal
for DRIVER input port
19
NC
O