Kenwood DMF-9020 Service Manual

Caution on condensation
Condensation (of dew) may occur inside the unit when there is a great
difference in temperature between this unit and the outside.
This unit may not function properly if condensation occurs. In this
case, leave the unit for a few hours with the power left ON, and
restart the operation after the condensation has dried up.
Be specially cautious against condensation in a follow-
ing circumstance:
When this unit is carried from a place to another across a large
difference in temperature, when the humidity in the room where this
unit is installed increases, etc.
Operation to reset
The microprocessor may fall into malfunction (impossibility to operate
erroneous display, etc.) when the power cord is unplugged while power
is ON or due to an external factor. In this case, execute the following
procedure to reset the microprocessor and return it to normal condition.
With the POWER key left to ON, unplug the power cord
from the power outlet then, while holding the eject (
0 )
key depressed, plug the power cord again.
÷ Please note that resetting the microprocessor clears the contents
stored in, it returns the microprocessor to the condition when it left
the factory.
Before transporting or moving this unit, carry out the
following operations.
1. Set the POWER key to ON without loading a Mini Disc.
÷ Check that no disc is present in the unit.
2. Wait a few seconds and verify that the display shown
appears.
3. Set the POWER key to OFF.
Note related to transportation and
movement
N O D
I
S
C
DMF-9020/9020(S)/MD-2070
2
CONTENTS/ACCESSORIES/CAUTIONS
CONTENTS/ACCESSORIES/CAUTIONS...................2
CONTROLS .................................................................3
BLOCK DIAGRAM .......................................................5
CIRCUIT DESCRIPTION.............................................6
PC BOARD ................................................................. 9
SCHEMATIC DIAGRAM ........................................... 13
EXPLODED VIEW .....................................................27
PARTS LIST...............................................................29
SPECIFICATIONS .......................................Back cover
CONTENTS
Remote control unit (1)
RC-M0905
(A70-1255-05)
Battery cover (A09-1106-08)
Batteries (2)
Audio
(E30-0505-05) (E30-2733-05) (B19-1529-05)
cord (2) System control cord (1) Optical fiber cable (1)
Cautions
Accessories
DMF-9020(K) INT1,1P( 98.11.26 5:24 PM y[W 3

Kenwood DMF-9020 Specifications

Digital Audio System

playing rotation	Approx. 400 rpm ~ 900 rpm (CLV)
frequency response (playback mode)	8 Hz ~ 20 kHz (± 1 dB)
signal to noise ratio (playback mode)	More than 112 dB

D/A and A/D Conversion

D/A conversion	1 Bit (24 bit type)
oversampling	8 fs (352.8 kHz)
A/D converter	4th order sigma-delta conversion+ D.R.I.V.E. conversion

Input and Output

analog input sensitivity / input impedance	500 mV / 22 kW
analog output level / output impedance	2.0 V / Less than 300 W
headphone output	50 mW/32 W load (Phones level MAX)

General Specifications

power consumption	20 W
dimensions	W: 440 mm, H: 125 mm, D: 373 mm
weight (net)	5.4 kg (11.9 lb)