Kenwood 1050 DM Service Manual

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STEREO MINIDISC RECORDER

1 050M D/ DM-5090

DM-9090

SERVICE MANUAL

KENWOOD

©1997»11/BS1-5387-00 (K/K) 3191

KENWOOD badge
(543-)

Front glass
(310-)

Knob
(K29-)

Knob
(K27-)

Metallic oabinet
(A01 -)

l

Optic receiving module
(W02-1181-05)

Phone jack (3P)
(E11-0190-05)

Phono jack
(E1 1 -)

AC power cord
(E30-)

Phono jack
(E63-0120-05)

Phono jack
(E63-)

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

Oscillating module
(W02-1114-05)

Power cord bushing
(J42-0083-05)

Illustration is DM-5090.
*Refer to parts list on page 40.
KENWOOD-Corp. certifies this e uipment conforms to

DHHS Regulation No.21 CFR1O 0110, Chapter 1,
Subchapter J.

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

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1050MD/DM-5090/DM-9090

+

CONTENTS/ACCESSORIES/CAUTIONS

CONTENTS

CONTENTS/ACCESSORIES/CAUTIONS....
EXTERNAL VIEW
BLOCK DIAGRAM ..
CIRCUIT DESCRIPTION. .
WIRING DIAGRAM .................................................... 1

4:2»wa

Accessofles

PC BOARD ......................
SCHEMATIC DIAGRAM ..
EXPLODED VIEW ..
PARTS LIST ............
SPECIFICATIONS ..................................................... 49

Audio cord (2)
(E30-0505-05)

Remote control unit (1)
(A70-1141-05: RC-M0702)

Batten! cover. (A09-0362-08)

System control cord (1)
(E30-2733-05)

Batteries (Re/AA) (2)

of

Optical fiber cable(1)
(519-1529-05)

AC adaptor (1)
(E03-0115-05)

TI» M type only

Cauflons

G

ote related to transportation and movement

Before transporting or moving this unit, carry out the
following operation.

1. Set the POWER key to ON without loading a Mini Disc.

0 Check that no disc is present in the unit.

2. Wait a few seconds and verify that the display shown
appean

3. Set the POWER key to OFF.

\

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 possi-
ble, or the unit may not function correctly.

This is not a malfunction, however, 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 a 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 tem»
perature of the unit and the ambient temperature, or in con-
ditions where condensation occurs easily. /

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1050MD/DM-5090/DM-9090

CIRCUIT DESCRIPTION

4-7 Precaution on use of test mode

+An erasure prevention control is not detected in the test
mode. Therefore, when the recording laser power mode
such as continuous recording mode and traverse adjust-
ment mode is entered, the contents of the existing record-
ing are erased irrespective of the control position. Be care-
ful not to enter the continuous recording mode and traverse
adjustment mode when using a disc, containing the data
that should not be erased, in the test mode.

5. Electrical adjustment

5-1 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 damage your eyes.

5-2 Precaution on handling of Optical pick-up (KMS-
260A)

The laser diode in an optical pick-up is easy to be subject to
electrostatic destruction. Therefore. solder-bridge the laser tap
on the flexible board when handling 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 measures against electrostatic destruc-
tion. The flexible board is out easily. Handle the flexible board

With care. P'CLKLW Flexible board

Laser tap
5-3 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 adjustment
is completed, cancel the test mode.

Optical BD board
pick-up IC6 D101 IC1,IC2,IC10
1.Temperature compenr
sation offset adjustment X 0 O O
2. Laser power adjustment 0 O X 0
3.Traverse adjustment 0 O X 0
4. Focus bias adjustment 0 O X 0
5. Error rate confirmation 0 O X 0

3) Perform the adjustment in the order described.

4) Use the following tools and measurement equipment.
- CD test disc TGYS-t
- Laser power meter

- Oscilloscope (with bandwidth of more than 40 M9)
(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-cir-
cuited in this case.)

Note : The "r display on the screen indicates an arbitrary
figure.

54 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 described below.

Insert a commercial recordable disc (blank disc).

Turn the JOG DIAL to display CREC MODE."

Press the ENTER key to display CREC IN".

Turn the JOG DIAL (CW ) to display GREG-MID.

After pressed the ENTER key, a display indicates
CREC(0300)" and the recording begins.

6. Terminate the recording within five minutes.

7. Press the DELETE key to stop the recording.

8. Press the EJECT key to take out the recordable disc.

PPSANT

As a result, a continuously recorded disc can be created for
focus bias adjustment and error rate confirmation.

Note : Take care that no vibration is applied during continu-
ous recording.

5-5 Laser power adjustment
Connection :

Laser
ower meter

:l

Objective lens of
optical pick up 4-0
Digital

voltmeter

m
ADJUSTMENT

TP2 O<-O+

-o'
TP10<

Adjustment :

1. Put the laser power meter on the objective lens of the
optical pick-up. Connect the digital voltmeter to TP1 and
TP2.

2. Turn the JOG DIAL to display LDPWR ADJUST.

(Laser power : For adjustment use)

Press the ENTER key to display (0.9mW)$##.

4. Adjust to turn JOG DIAL so that the laser power meter
reads 0.86 - 0.94mW.

Set range 10mW of the laser power meter,then save to
press ENTER key.

5. (7.0mW)$##" is displayed.

6. Adjust to turn the JOG DIAL so that laser power meter
reads 6.9-7.1mW, then save to press ENTER key.
("LDPWR<$##" is displayed monentarily.)

9°

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