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MD PERSONAL STEREO SYSTEM
MDX-G1
SERVICE MANUAL
© 2001-6 PRINTED IN KOREA
B51-5734-00 (K/K) 481
In compliance with Federal Regulations, following are
reproduction of labels on, or inside the product relating to
laser product safety.
KENWOOD-Crop. 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.
PUSH OPEN
CD/MD
High Speed Dubbing System
TUNER FM/AM
STOP
MD
CD
MENU
SOUND
MD REC
BEST HITS
AUX
VOLUME/MULTI CONTROL
SET
TUNING
MODE
/ TUNING
4
TUNING/
¢
MD PERSONAL STEREO SYSTEM
DISC LOADING MECHANISM
STANDBY
/TIMER
ON/STANDBY
EJECT
ONE
RANDOM
PGM
REPEAT
TRACK NO.
SLEEP
DISC
O.T.T.
PROG.
TOTAL
O.T.E
HIGH-SPEED
AUTO TUNED
SP
REC
LP
BEST HITS
EX. BASS
MD-EDIT
LOUD
kHz
MHz
AM
ANTENNA
PHONES
AC IN ~
AUX IN
Panel ass'y *
(A60-)
Top ass'y *
(A52-)
Plastic cabinet *
(A02-)
Rod antenna
(T90-0828-05)
Miniature phone jack
(E11-0353-05)
AC inlet
(E03-0374-05)
Miniature phone jack
(E11-0399-05)
Handle *
(K01-)
Arm
(D10-5011-04)
* Refer to parts list on page 25 .
MDX-G1 has 3color; W: White, S: Silver, Y: Yellow
70%
Note: Please contact KENWOOD service in your side if you want to get the AC power cord.


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Am loop antenna (1)
(T90-0865-05)
Batteries(R6/AA)
for remote (2)
Remote control unit (1)
(A70-1509-05)
Battery cover (A09-1229-08)
MDX-G1
2
CONTENTS / ACCESSORIES / CAUTIONS
CONTENTS / ACCESSORIES / CAUTIONS ............. 2
CIRCUIT DESCRIPTION ............................................3
ADJUSTMENT ..........................................................11
WIRING DIAGRAM ...................................................12
PC BOARD .............................................................. 13
SCHEMATIC DIAGRAM .......................................... 16
EXPLODED VIEW ....................................................26
PARTS LIST..............................................................28
SPECIFICATIONS ......................................Back cover
Contents
Accessories
Cautions
Note related to transportation and movement
Before transporting or moving this unit, carry out the following operations.
(1) Remove the CD or MD from the unit.
(2) Press the
6 key of the MD.
(3) Wait for some time and verify that the display becomes as shown in the
figure.
(4) Press the
6 key of the CD.
(5) Wait for some time and verify that the display becomes as shown in the
figure.
(6) Wait a few seconds and turn the unit OFF.
Operation to reset
The microcomputer may fall into malfunction when a cord is unplugged and
plugged again while the unit is ON or due to an external cause. In such a
case, the microcomputer should be reset as described below:
Unplug the power cord from the wall outlet and, while holding the
ON/STANDBY
key depressed, plug the power cord again. This initializes
the microcomputer. Note that this clears the previously stored memory.
CAUTION
CLASS 1
LASER PRODUCT
INVISIBLE LASER RADIATION
WHEN OPEN. AVOID EXPOSURE
TO BEAM.
The marking of products using lasers (Except for some areas)
The marking is located on the rear panel and says
this product has been classified as Class 1. It
means that there is no danger of hazardous radia-
tion outside the product
Inside this laser product, laser diodes classified as
Class 3A and 3B laser radiation are contained as
alerted by the internal caution label shown above.
To avoid exposure to laser beams, do not open the
cover.
SP
MD
SP
CD


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1. Initializing
1-1 Initialization Method
· While pressing the [ON/STANDBY] key, turn the AC
on.
1-2 Initialization Operation
· During the initial operation, the display shows "INI-
TIALIZE" and after that it will be retuned to standby
condition.
· If any mechanisms error occurred, the error indication
is displayed as "ERR" on the display.
1-3 Mechanism Initialization
1 CD Mechanism
· If a mechanism error occurred, the error indication is
displayed as "C ERR" on the display.
2 MD Mechanism
· If a mechanism error occurred, the error indication is
displayed as "M ERR" on the display.
· The disc will be unloaded from MD mechanism auto-
matically, if a disc is its in.
2. Tuner Destination
Set Destin- Band Receiving Frequency Channel
IF
RF
ation
Range
Space
M
E1
FM
87.5MHz~108.0MHz
50kHz
+10.7MHz 25kHz
AM
531kHz~1602kHz
9kHz
+450kHz
9kHz
3. Tuner Preset Frequency
P.CH
Band
Frequency
1
FM
98.30MHz
2
FM
87.50MHz
3
FM
92.00MHz
4
FM
108.00MHz
5
FM
89.10MHz
6
FM
90.00MHz
7
FM
87.50MHz
8
FM
87.50MHz
9
AM
1602kHz
10
AM
999kHz
P.CH
Band
Frequency
11
AM
630kHz
12
AM
1440kHz
13
FM
106.0MHz
14
AM
531kHz
15
FM
87.50MHz
16
FM
98.00MHz
17
FM
98.50MHz
18
FM
87.50MHz
19
AM
990kHz
20
FM
97.70MHz
TEST MODE
KEY
SETTING
CD MODE
CD PLAY
MD MODE
MD PLAY
Insert the AC cord to
MD MECHA. ADJ.
EJECT
AC wall outlet with
MODE
pressing the left key.
SUB CLOCK OSC
MENU
DIAGNOSIS
4. Test Mode
4-1 Setting method of the Test Mode
The oscillation diagnosis(existence of oscillation and
measurement of period) of a sub clock is performed
before the test mode is entered. If the diagnosis result
is OK, the system enters the test mode.
If the diagnosis result is NG, the oscillation of the sub
clock is diagnosed again. If the result is OK, the sys-
tem enters the test mode. If the diagnosis result is
continuously NG 5 times, the system stops with
"ERR1" and "ERR2" displayed.
4-2 Cancel of the test mode
· By turning the AC off, the system is initialized and the
test mode is canceled.
· Cancel the test mode only if the power switch is
turned off
4-3 Contents of the Test Mode
· The muting during mode selection is not controlled in
the test mode.
· During the test mode, it can be operated in a special
manner that is different from an ordinary operation by
using the keys on the main body, specifically as
shown in the following tables.
KEYS
DISPLAY
OPERATION
CD-PLAY/PAUSE
05
:
· Tracking-servo on.
(Cyclically changed
(
: )Time Display
the mode 05 and 03
by pressing the key.)
03 --:--
· Tracking-servo off.
CD STOP
01 --:--
· Stop the CD operation.
Adjustment value/mean value
(Cyclically changed
07 FG/FE
FG value/FE value
in the stop mode
08 FB/FO
FB value/FO value
only.)
09 TG/TE
TG value/TE value
10 TB/TO
TB value/TO value
SKIP UP/SKIP DOWN
Usual Indication
· Track No up or down.
SKIP UP
Ex.Tno. 01îTno. 02
· Play the first track No. in the stop mode.
SKIP DOWN
Usual Indication
· Play the last track No. in the stop mode.
*SKIP UP
FF
· CD FF search.
· The pickup travels outward in the stop mode.
*SKIP DOWN
FB
· CD FB search.
· The pickup travels inward in the stop mode.
MENU
HI-SPEED
· Hi speed playback uw Normal speed playback
NR-SPEED
* Keep to press the key more than 400ms.
4-4 CD Test Mode
P.CH
Band
Frequency
21
AM
531kHz
22
FM
87.50MHz
23
FM
87.50MHz
24
FM
87.50MHz
25
FM
87.50MHz
P.CH
Band
Frequency
26
FM
87.50MHz
27
FM
87.50MHz
28
FM
87.50MHz
29
FM
108.0MHz
30
AM
945kHz
MDX-G1
3
CIRCUIT DESCRIPTION


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For more information on each adjustment mode, refer to
each section of 6, "Electrical adjustment".
If other adjustment mode has been entered incorrectly,
press the STOP key to exit the mode.
The number 9 - 13 are not used for service. If these
mode have been entered incorrectly, press the STOP
key immediately to exit the mode. Specially, do not use
EEP INITIAL. (E2PROM data has initialized if used it.)
5. MD TEST MODE FOR ADJUSTMENT
5-1 Entering the Test Mode
While pressing the EJECT key, turn the AC on.
5-2 Cancelling the Test Mode
Turn the AC off.
5-3 Key Operations for Adjustment
No.
LCD
DESCRIPTION
SECTION
1
TEMP ADJU
The work of adjustment is unnecessary
in this mode.
6-5
2
LDPWR ADJU
Laser power adjustment.
6-6
3
LDPWR CHEC
Laser power check.
6-6
4
EFBAL ADJU
Traverse adjustment.
6-7
5
TE B. ADJ
Automatic EF balance adjustment.
6-8
6
FBIAS ADJU
Focus bias adjustment.
6-9
7
CPLAY MODE
Continuous playback mode.
5-5
8
CREC MODE
Continuous recording mode.
5-6
9
STT-LIMIT
Check the mechanism start limit
switch position.
-
10 JUMP MODE
Track jump checking mode.
-
11 SRV DAT RE
Servo data reading.
-
12
EEP MODE
E2PPROM data reading or rewrite.
-
13
EEP INITIAL
E2PPROM data initializing.
-
KEYS
OPERATION
SKIP UP/DOWN
Select mode or adjustment value change.
MD PLAY/PAUSE
Fix mode or adjustment value.
STOP
Cancel the selected mode.
¡
Pickup moves outwards when pressed skip up key.
1
Pickup moves inwards when pressed skip down key.
Remote control only.
5-4 Selection of Adjustment Test Mode
Whenever the "SKIP UP" and "SKIP DOWN" keys are
pressed, the adjustment test mode is selected.
1. Setting of Continuous Playback Mode
No.
Key
1
4 ¢
Select [CPLAY MODE]
2
Load disc
3 MD
6
[CPLAY MID]
[c=xxxx a=yy] error
(xxxx=C1 error, yy=ADIP error)
[CPLAY OUT]
[c=xxxx a=yy] error
(xxxx=C1 error, yy=ADIP error)
4 STOP
[CPLAY MODE]
2. Change of Playback Points(in continuous playback mode)
No.
Key
Display/Function
Display/Function
1
MD
6
2
[CPLAY IN]
[c=xxxx a=yy] error
(xxxx=C1 error, yy=ADIP error)
MD
6
3
Carry out No.1 to 3 in the above table.
4
5
STOP
[CPLAY MODE]
EJECT
Disc out
1. Continuous Recording Setting
No.
Key
Display/Function
1
4 ¢
Select [CREC MODE]
2
Load the recordable disc
3 MD
6
[CREC MID]
4 MD
6
[CREC (zzzz)] CREC address
(0300h cluster=recording start point)
5 STOP
[CREC MODE]
2. Change and End of Recording Points
1
Carry out No.1 to 3 in the above table Select[CREC MID]
2
¢
[CREC OUT]
3 MD
6
[CREC (zzzz)] CREC address
(0700h cluster=recording start point)
4 STOP
[CREC MODE]
6
5
¢ (2time) Select [CREC IN]
7 MD
6
[CREC (zzzz)] CREC address
(0300h cluster=recording start point)
8 STOP
[CREC MODE]
MD
6
[CREC MID]
9 EJECT
Disc out
5-5 Continuous Playback Mode
5-6 Continuous Recording Mode
KEYS
DISPLAY
OPERATION
STOP
Tno. 00 : 00
· Stop the MD operation.
SKIP UP/SKIP DOWN
Usual Indication
· MD Track No up or down.
* SKIP UP
FF
· MD FF search.
* SKIP DOWN
FB
· MD FB search.
· Hi-speed O.T.E.(CDîMD) operation with LP4 mode.
BEST HITS
MD REC
AUX
REC
· Start the MD recording.
ALL ERASE
ó
· Stop the MD operation ,and start operation of
SET
COMPLETE
ALL-ERASE if disc is recordable.
ó
BLANK DISC
4-5 MD Test Mode
* Keep to press the key more than 400ms.
C
M
M :MD
C :CD
Counter
Tno.
MDX-G1
4
CIRCUIT DESCRIPTION


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MDX-G1
5
CIRCUIT DESCRIPTION
1. The recording start addresses of IN, MID, and OUT are
described below.
IN
30H cluster
MID 300H cluster
OUT 700H cluster
2. An erasure prevention control is not detected in the test
mode. Be careful not to enter the continuous recording
mode using a disc containing the data that should not be
erased.
3. Do not record continuously for more than five minutes.
4. Take care that no vibration is applied during continuous
recording.
6. ELECTRICAL ADJUSTMENT
6-1 Precaution during confirmation of Laser
Diode emission
During adjustment, do not view the emission of a laser
diode from just above for confirmation. This may dam-
age your eyes.
6-2 Precaution on handling of Optical pick-up
(KMS-260B)
The laser diode in an optical pick-up is easy to be sub-
ject to electrostatic destruction. Therefore, solder-
bridge the laser tap on the flexible board when han-
dling the optical pick-up.
When removing the flexible board from the connector,
make a solder bridge in advance, then remove the
board. Be careful not to remove the solder bridge before
inserting the connector. Moreover, take careful mea-
sures against electrostatic destruction. The flexible
board is cut easily. Handle the flexible board with care.
6-3 Precaution during adjustment
1) Perform the adjustment and confirmation marked with "O"
in the order shown in the table when the parts below are
replaced.
2) In the test mode, perform the adjustment. After adjust-
ment is completed, cancel the test mode.
3) Perform the adjustment in the order described.
4) Use the following tools and measurement equipment.
· CD test disc TGYS-1
· Laser power meter
· Oscilloscope (with bandwidth of more than 40 M
)
(Calibrate the probe before measurement.)
· Digital voltmeter
· Thermometer
5) Take care that VC and GND (ground) are not connected
on the oscilloscope when two or more signals are moni-
tored on the oscilloscope. (VC and GND are short-circuit-
ed in this case.)
6-4 Creating the recordable continuous recording
disc
This disc is used for focus bias adjustment and error rate
confirmation. How to create the recordable continuous
recording disc is 4-6.
Optical
BD board
pick-up
IC7
D3
IC1, IC2, IC6
1.Temperature compen-
sation offset adjustment
X
O
O
O
2.Laser power adjustment
O
O
X
O
3.Traverse adjustment
O
O
X
O
4.Focus bias adjustment
O
O
X
O
5.Error rate confirmation
O
O
X
O
Pick-up
Flexible board
Laser tap
6-5 Offset Adjustment
No.
Key
Display/Function
1
4 ¢
Select [TEMP ADJU]
2 MD
6
[TEMP=xx (yy)]
(xx=compensation data, yy=setting temperature)
3
4 ¢
Input "yy" with present temp..
4 MD
6
[TEMP=
SAVE] in writing data
[TEMP ADJU ST]
6-6 Laser Power Check and Adjustment
Laser power setting in playback and recording modes.
Preparation
1. Remove the MD mechanism from the unit.
2. Connect the digital voltmeter to TP1 and TP2 on X33 pcb.
3. Remove the top plate from traverse unit.
4. Remove the magnetic head.
5. Remount the MD mechanism to the unit
+
-
Laser
power meter
Digital
voltmeter
Objective lens of
optical pick up
TP2
TP1
X33
ADJUSTMENT
1. Laser Power Adjustment
No.
Key
Display/Function
1
4 ¢
[LDPWR ADJU]
Load recordable disc
2
Load the disc and lazer on
[(a0.9mW) $xx] read power
(xx=power value)
4
3
EJECT
MD
6
Unload the disc and laser on
5 MD
6
[LDPWR CHECK]
6
1 ¡
Move the pickup to check the laser power with
laser power meter sensor
7
4 ¢
Adjust "xx" so that the power meter shows 0.9mW.
8 MD
6
[(a7.0mW) $xx] writing power
9
4 ¢
Adjust "xx" so that the power meter shows 7.0mW.
This adjustment should be carried out in 15 secs.
10 MD
6
Laser power off
Display shows [LDPWR ADJUST] after [LDPWR<$xx]
to save the data in E2PROM
Start from No.2 if readjust.