Kenwood DM-3090 User manual

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 Regulation No.21 CFR 1040.10, Chapter 1,
Subchapter J.
DANGER : Laser radiation when open and interlock
defeated.
AVOID DIRECT EXPOSURE TO BEAM.
*Refer to parts list on page 49.
STEREO MINIDISC RECORDER
DM-3090
SERVICE MANUAL
© 1997-11/B51-5396-00 (K/K) 1812
MULTI CONTROL
TIME DISPLAY DISPLAY/CHARAC. TRACK/EDIT
ON/STAND BY
STEREO MINIDISC RECORDER
TIMER/
DELETE ENTER
REC REC LEVEL
0 10
PHONES LEVEL
MIN MAX
PHONES
R
L
R
L
PLAY
OUT REC
IN
DIGITAL LINE
2
REC IN
1
REC INPLAY OUT
OPT.
RESET
KENWOOD badge
(B43-0302-04) Front glass (B10-2457-08) Front panel (A60-1370-08) Knob (JOG)
(K29-6946-08) Knob (REC/HP) (K29-6947-08)
AC power cord bushing
(J42-0338-08)
AC power cord *
(E30-)
Optical digital output
(W02-2643-08) Switch (RESET)
(S68-0091-08)
Analogue output terminal
(E63-1031-08)
Optical digital input
(W02-2643-08)
Knob (POWER)
(K27-2261-08) Knob (K27-2262-08) Head phone jack (E11-0345-08)
Panel
(A29-0898-08)
Digital input terminal
(E63-1032-08)
DM-3090(K) COVER 97.11.29 0:18 AM y[W 2

If a problem occurs
If this product is subjected to strong external interference
(mechanical shock, excessive static electricity, abnormal
supply voltage due to lightning, etc.) or if it is operated
incorrectly, it may malfunction or the display may not
function correctly. If such a problem occurs, do the
following:
• Unplug the AC power lead from the AC socket.
• Wait about 20 - 30 seconds and then plug the AC power
lead back into the AC socket.
• Press the reset key on the back of the unit.
• When the reset key is pressed, all of the settings in memory
will be erased.
R
L
R
L
PLAY
OUT
REC
IN
DIGITAL LINE
2
RECIN
1
RECINPLAYOUT
OPT.
RESET
RESET
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 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
temperature of the unit and the ambient temperature, or in
conditions where condensation occurs easily.
6
1
9
+10
2 3
4 5 7 8 0
Remote control unit (1)
(A70-1208-08)
Battery cover (A09-0337-08)
Audio cord (2)
(E30-0505-05) Optical fiber cable (1)
(B19-1529-05)
Batteries (2)
DM-3090
2
CONTENTS/ACCESSORIES/CAUTIONS
CONTENTS/ACCESSORIES/CAUTIONS...................2
CONTROLS.................................................................3
DISASSEMBLY FOR REPAIR.....................................5
BLOCK DIAGRAM.......................................................7
CIRCUIT DESCRIPTION.............................................9
TROUBLE SHOOTING..............................................16
ADJUSTMENT...........................................................24
PC BOARD ............................................................... 32
SCHEMATIC DIAGRAM ........................................... 37
EXPLODED VIEW .....................................................47
PARTS LIST...............................................................49
SPECIFICATIONS .......................................Back cover
CONTENTS
Accessories
Cautions
DM-3090(K) COVER 97.11.29 0:18 AM y[W 3

Names and functions of parts
MULTI CONTROL
TIME DISPLAY DISPLAY/CHARAC. TRACK/EDIT
ON/STAND BY
STEREO MINIDISC RECORDER
TIMER/
DELETE ENTER
REC REC LEVEL
0 10
PHONES LEVEL
MIN MAX
PHONES
1

2

3

4

5

6

7

8

9

0

!

@

#

$

%

^

1Eject key:
2Power switch (ON/STAND BY key)
3Mini Disc Insertion slot
4TIME DISPLAY key
5DISPLAY/CHARAC key
6TRACK/EDIT key
7TIMER/DELETE key
8Jog dial (Next/Previous)
9ENTER key
0Headphone jack (HONES)
!Headphone output level control
@Record level control
#Record key:
$Play/Pause key:
%Stop key:
^Cue/Review key: /
−
∞
TOC DISC
TOTAL
REMAIN
RANDOM
TIMER REC CLOCK
TRACK DATE 0dB OVER12 4
MONO LP PRGM
1
8
15
2
9
16
3
10
17
4
11
18
5
12
19
6
13
20
7
14
1
2

3

4

5

6
7

8

9

0

!

@

#

$

%

^

&

*

(

1Pause indicator:
2Record indicator:
3Play indicator:
4Monaural Long-Play Mode indicator
5Programme indicator
6Repeat indicator:
7Total Time/Remaining Time indicator
8Random indicator
9Timer Playback/Timer Recording indicator
0Clock indicator
!Music Calendar
@More Tracks indicator
#Recording Level indicator
$Recording level too high indicator
%Level Meter/Character Information display
^Date indicator
&Track indicator
*Disc Name indicator
)TOC Indicator: TOC
Front panel
Display
Display
DM-3090
3
CONTROLS
DM-3090(K) COVER 97.11.29 0:18 AM y[W 6

Remote control unit
POWER
DISPLAY
TIME
DISPLAY
6
1
9
+10
REC
MODE
PLAY
MODE
AUTO
MARK REC CANCEL
SYNCHRO
REC
REC
REC
INPUT
TRACK EDIT TIMERENTER
PROGRAM
CLEAR
EJECT
2 3
4 5
7 8
0
SELECT
REMOTE CONTROL UNIT
RC-M0301
7

6
5

4

3

2

1

4Basic operation keys
/
: Skip down/ Skip up
(Cue/Review) key
REC : Record key
: Stop key
: Play/Pause key
PLAY MODE
: Play mode key
7Display keys
DISPLAY : Display key
TIME DISPLAY : Time display
key
Model: RC-M0301
Infrared ray system
PHONES
PHONES LEVEL
MIN MAX
The remote control unit incorporates the basic operation keys as well as a variety of applied operation keys
so that it can be used in a wide range of purposes.
Use care to store the remote control unit in a safe place so as not to lose it.
1POWER key
2EJECT key
3Numeric keys
6Recording operation keys
REC INPUT: Input select key
REC MODE: Record mode key
AUTO MARK: Auto mark key
REC CANCEL: Record cancel
key
Plug the stereo headphones (with standard-plug) available in audio stores into the PHONES jack and adjust the listening volume
with the PHONES LEVEL control on the front panel.
Listening through headphones
5Applied operation keys
ENTET: Entet key
TRACK EDIT: Edit key
TIMER: Timer key
SYNCHRO REC:
Synchro recording key
PROGRAM: Program key
DM-3090
4
CONTROLS
DM-3090(K) COVER 97.11.29 0:18 AM y[W 7

REMOVING AND REINSTALLING THE MAIN PARTS
MD MECHANISM SECTION
Performsteps1to3ofthedisassemblymethodtoremovethe
MD mechanism.
How to remove the magnetic head
(See Fig. 10-1)
1. Remove the screws (A1) x 1 pc.
10
Caution:
Takeutmostcaresothatthemagneticheadisnotdamaged
when it is mounted.
How to remove the cartridge holder
(See Fig. 10-2)
1. Open the roller arm lever in the arrow direction, and lower
the clamper lever to the rear side.
2. Apply +5V to the red line side of blue connector of loading
motor,pushtherackgearinthearrowdirectiontomovethe
cam plate lever until tick is heard.
3. Remove the screw (B1) x1 pc., and the spring (B2) x1 pc.,
fitted to the holder arm, and shift the cartridge holder to the
left side to remove it.
How to remove the mechanism switch PWB
(See Fig. 10-3)
1. Remove the screws (C1) x 2 pcs., and remove the mecha-
nism switch PWB.
Figure 10-1
Figure 10-2
Figure 10-3
MD Mechanism
(A1)x1
ø1.7x5mm
Magnetic Head
Slider Lever
Cartridge Holder
Clampa Lever
Lack Gear
Roller Arm Lever
Loading Motor
Cam Plate Lever
(B1) x1
Ø1.7x5mm
(B2) x1
(C1)x1
Ø1.7x3mm
(C1)x1
Ø1.7x9.5mm
MD Mechanism
Switch PWB
DM-3090
5
DISASSEMBLY FOR REPAIR
DM-3090(K) COVER 97.11.29 0:18 AM y[W 10

How to remove the sled motor/loading motor
(See Fig. 11-1)
1. Remove the screws (D1) x 1 pcs., and remove the sled
motor/loading motor.
Caution:
Be careful so that the gear is not damaged.
(The damaged gear emits noise during searching.)
Figure 11-1
Figure 11-2
Figure 11-3
How to remove the spindle motor
(See Fig. 11-2)
1. Remove the screws (E1) x 3 pcs., and remove the spidle
motor.
Caution:
Be careful so that the turntable is not damaged.
How to remove the optical pickup
(See Fig. 11-3)
1. Remove the screws (F1) x 3 pcs.
Caution:
Be careful so that the gear is not damaged.
(The damaged gear emits noise during searching.)
Sled Motor
Loading
Motor
(D1)x2
Ø1.7x2mm (D1)x2
Ø1.7x2mm
Spindle Motor
Turntable
(E1)x3
Ø1.7x2.5mm
Optical Pickup
(F1)x3
Ø1.7x9.5mm
DM-3090
6
DISASSEMBLY FOR REPAIR
DM-3090(K) COVER 97.11.29 0:18 AM y[W 11

Figure 28BLOCK DIAGRAM (1/2)
D6.5/4.75 ~ 5.25V
MECHAN1SM
6.5/4.75~5.25V
D3.2V
SYSCLK
DVDD
DVDD
D3.2V
DIGITAL
3.2V
D3.2V
D4.3V
D4.3V
D3.2V
D4.3V
D3.2V
BACKUP
VOLTAGE
REGULATOR
POWER
IC1402
S29294A
E
2
PROM
IC1601
M56758FP
5-CH
MOTOR
DRIVER
BACKUP
MD MICRO COMPUTER
IC1401
IX0227AW
MD SYSTEM
MICRO
COMPUTER
DIGIN(EIAJ)
PDOWN
DIGOUT(EIAJ)
GND
GND
1
2
4
3
BCLK
MUTE
DFS0
DADATA
LRCLK
ADDATA
DFS1
LOAD IN
RESET
MD-ST
DSCK
SERCH
1
2
24
23
22
21
20
19
18
17
16
15
14
4
5
6
7
8
9
13
10
11
12
3
D.GND
D.GND
D.GND
D.GND
DSTB
MDDATA
KDATA
4M
DRAM
ENDEC
ATRAC
IC1201
LR37648
OSCILLATOR
XL1201
(33.8688MHz)
SW1956
SW1955
SW1954
SW1953
SW1952
Q1251~Q1254
MD
RECORDING HEAD
M901
SPINDLE MOTOR
M902
SLED MOTOR
M903
LOADING SWITCH
RECSWITCH
PLAYSWITCH
LEAD INSWITCH
A–BSIGNALE–FSIGNAL
RF1 ~ RF4SIGNAL
HEAD DRIVE
SIGNAL
IC1251
IC1101
IR3R55
RF
SIGNAL
PROCESSOR
LOADING MOTOR
HEAD UP/DOWN
M
M
DIRECT SWITCH
WRITE PRO
M
LASER DIODE
MONITOR DIODE
RF4
RF3
RF2
RF1
LIGHT
RECEIVING
SECTION
ERROR
SIGNAL
LIGHT
RECEIVING
SECTION
RF
F
A
B
E
FOCUS
TRACKING
PICK UP UNIT
IC1202
IX2474AF
CNP1904
CNP1902
IC1906
AND GATE TC7ST08F
IC1907
CLOCK GENERATOR TC92ASF
IC1990
INVERTOR 74AC04FS
IC1916
AND GATE
74VHC08F
DM-3090
7
BLOCK DIAGRAM
DM-3090(K) COVER 97.11.29 0:19 AM y[W 14

Figure 29BLOCK DIAGRAM (2/2)
LINE IN
J101
IC101
NJM4560D
OPE AMP
+7V
+7V
-7V
-7V
REC VOL
VR901
SYSCLK AD DATA LRCLK BLCK DA DATA
MODE CLK
DATA
Q601
Q602
IC501
REGULATOR
S81233YK
J301
DIGITAL -IN
(COAXIAL JACK)
SO302
DIGITAL IN
(OPTICAL JACK)
RX302
DIGITAL OUT
(OPTICAL JACK)
IC301
74HCU04
INVERTER
IC302
NAND GATE
74HC10AP
DIGITAL IN
MD UNIT
DIGIN VCC
DIGITAL OUT
Q503
A-7V
POWER
CIRCUIT
MD+
POWER
CIRCUIT
5V SYSTEM
POWER
CIRCUIT
BACK UP 5V
DIGITAL 5V
MD 5V
MD+
S-ID,SYN,RESET,DSTB,DSCK
K-DATA,MD DATA
FL DISPLAY +B
FL901
~ ~
~ ~
DIG
SEG
JOG
KEY
RX-IN
IC901
IX0196AW
SYSTEM
MICROCOMPUTER
MD
MUTE
SW901
JOG
SWITCH
KEY IN
BLOCK
UN970
REMOTE
SENSOR
FL VP(-31V)
A/D +5V
BACK UP +5V
FL
POWER
CIRCUIT
FL VP(-32V) FL DISPLAY +B
RECTIFYING
CIRCUIT
F551
1A L 250V
F552
1A L 250V
T551
POWER TRANSFORMER
AC 230V
50Hz
HEADPHINES
J981
H.P.VOL
VR981
IC651
NJM4560D
OPE AMP
Q451
Q452 MUTE
J101
LINE OUT
3
4
51
7
83
5
12 19 16 13 15
24
26
10
2
3
4
51
7
2
1
3
8
34
51
7
8
8
13
2
6
13
10
17
21
21 42 60 89
45 90 92 97
2
3
6
32
10
33
96
91
100
~~
+7V -7V
IC201
UDA1340
AD/DA
CONVERTER
IC601
LINE AMP.
NJM4580D
Q502
Q506
Q504
A+7V
POWER
CIRCUIT
3V
~
DM-3090
8
BLOCK DIAGRAM
DM-3090(K) COVER 97.11.29 0:19 AM y[W 15

DM-3090
1 RF1 I
I
I
I
I
I
I
I
I
I
I
I
I
I
O
O
O
O
O
O
O
O
O
I
O
O
O
O
–
–
–
–
–
–
–
–
–
–
I
–
I
O
O
O
O
–
O
O
RF signal input terminal 1 Input of RF signal output of pickup
2 RF2 RF signal input terminal 2 Input of RF signal output of pickup
3 RF3 RF signal input terminal 3 Input of RF signal output of pickup
4 RF4 RF signal input terminal 4 Input of RF signal output of pickup
5 REFI Reference voltage amp. input terminal
6 REFO Reference voltage amp. output terminal
7 RFADD RF1 to 4 resistance addition output terminal
8 TCGI Track cross detection signal amp. input terminal for groove
9 AIN Servo signal amp. (focus servo system) inversion input terminal
10 BIN Servo signal amp. (focus servo system) inversion input terminal
11 EIN Servo signal amp. (tracking servo system) inversion input terminal
12 FIN Servo signal amp. (tracking servo system) inversion input terminal
13 BIAS Bias input terminal
14 AVCC Analog section power terminal
15* VSTBY Logic signal output terminal (STBY signal inversion signal is output.)
16* XDISC Logic signal output terminal (DISC signal inversion signal is output.)
17* XSGAIN Logic signal output terminal (SGAIN signal inversion signal is output.)
18 AGND Analog section GND terminal
19 DGND Digital section GND terminal
20 DTEMP Chip temperature detection terminal
21 LATCH Latch signal input terminal
22 CLOCK Clock signal input terminal
23 DATA Serial data input terminal
24 DVCC Digital section power terminal
25 FOUT Servo signal amp. (tracking servo system) output terminal
26 EOUT Servo signal amp. (tracking servo system) output terminal
27 BOUT Servo signal amp. (focus servo system) output terminal
28 AOUT Servo signal amp. (focus servo system) output terminal
29 TCGO Track cross detection signal amp. output terminal for groove
30 WBO Comparator output terminal for ADIP signal binary-coding
31 22KI Comparator input terminal for ADIP signal binary-coding
32 22KO ADIP signal HPF amp. output terminal
33 ADLPFO ADIP signal LPF amp. output terminal
34* NC NC
35 ADIPO ADIP signal primp. output terminal
36 ADIPI ADIP signal AGC amp. output terminal
37 ADAGC ADIP signal AGC smoothing capacitor connection terminal
38 ADAGI ADIP signal AGC amp. input terminal
39 RF2-1 RF1 and RF2 difference signal
40 EFMO RF signal primp. output terminal
41* WFMI RF signal AGC amp. output terminal
42 AVCC Analog section power terminal
43 AGND Analog section GND terminal
44 EFMAGC EFM signal AGC smoothing capacitor connection terminal
45 EFMAGI EFM signal AGC amp. output terminal
46* ATTR Pins 47 and 48 output signal attenuation terminal
47 GOUT Output of signal of RF1+RF2-RF3-RF4 for groove
48 POUT Rf1 to 4 resistance addition output for pit
IC1101 VHiiR3R55//-1:RF Signal Control (IR3R55)
Pin No. Terminal Name I/O Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
CIRCUIT DESCRIPTION
9
DM-3090(K) COVER 97.11.29 0:20 AM y[W 38

DM-3090
1* EFMMON Output EFM monitor output
2 AVCC — Analog power
3 EFMI Input EFM signal input from RF amp.
4 AGND — Analog GND
5 AIN Input Focus error signal A
6 EIN Input Tracking error signal E
7 TCG Input Track cross signal
8 BIN Input Focus error signal B
9 FIN Input Tracking error signal F
10* VBAT Input Power voltage detection signal for constant voltage servo
11 WBI Input ADIP wobble signal
12 VDD1 — Digital power
13 DGND — Digital GND
14,15 TEST0,TEST1 Input Input for test. Connection to GND in case of normal use
16 TEST2 Input Input for test. Endecode/servo mode and ATRAC mode selection
17 X176KO Output Clock output. f=176.4 kHz (4fs)
18 FODRF Output Focus servo forward output. PWM
19 FODRR Output Focus servo reverse output. PWM
20 TRDRF Output Tracking servo forward output. PWM
21 LATCH Output Tracking servo reverse output. PWM
22 CLOCK Output Slide servo forward output. PWM
23 DATA Output Slide servo reverse output. PWM
24 DVCC Output Spindle servo forward output or spindle servo output. PWM
25 FOUT Output Spindle servo reverse output or spindle rotation (forward/reverse)selection
26 EOUT Output Address output to external D-RAM. ADR3
27 BOUT Output Address output to external D-RAM. ADR2
28 AOUT Output Address output to external D-RAM. ADR1
29 TCGO Output Address output to external D-RAM. ADR0 (LSB)
30* WBO Output Address output to external D-RAM. ADR10 (MSB)
31 22KI — Power supply for DRAM interface
32 22KO Output Address output to external D-RAM. ADR4
33 ADLPFO Output Address output to external D-RAM. ADR5
34 NC Output Address output to external D-RAM. ADR6
35 ADIPO Output Address output to external D-RAM. ADR7
36 ADIPI Output Address output to external D-RAM. ADR8
37 ADAGC Output Data output enable signal output to external D-RAM
38 ADAGI — Digital GND
39 RF2-1 Output Column address strobe signal output to external D-RAM
40 EFMO In/Output Data input/output from and to external D-RAM. D2
41 WFMI In/Output Data input/output from and to external D-RAM. D3 (MSB)
42 AVCC Output Data input/output from and to external D-RAM. ADR9
43 AGND Output Low address strobe signal output to external D-RAM
44 EFMAGC Output Data write enable signal output to external D-RAM
45 EFMAGI In/Output Data input/output from and to external D-RAM. D1
46 ATTR In/Output Data input/output from and to external D-RAM. D0 (LSB)
47* GOUT Output Track cross signal
48* POUT Output ADIP CRC error flag monitor output
49* PLCK Output EFM PLL clock output in playback mode
50 EFM0 Output EFM signal output in record mode. C1F (C1 error flag) monitor output in playback mode
51* X700KO Output Clock output. f = 705.6 kHz. Clock output is not performed when RSTX = 0.
52* EXPORT0 Output Microcomputer extension output port 0
53* EXPORT1 Output Microcomputer extension output port 1
IC1201 VHiLR37648/-1:ENDEC/ATRAC (LR37648)
Pin No. Terminal Name Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output
CIRCUIT DESCRIPTION
10
DM-3090(K) COVER 97.11.29 0:20 AM y[W 37

54 TESO1 Output PLLLR. Microcomputer extension output port 2 in case of selection
55 TESO3 In/Output PLLOSC. Microcomputer extension output port 3 in case of selection
56 TEST4 In/Output EXTCLK. Microcomputer extension output port 4 in case of selection
57 CDDATA In/Output High speed dubbing CD data input. Microcomputer extension output port 5 in case of selection
58 CDLRCK In/Output High speed dubbing CD LR data input. Microcomputer extension output port 6 in case of selection
59 CDBCLK In/Output High speed dubbing CD bit data input. Microcomputer extension output port 7 in case of selection
60 VXI Input Vari-pitch PLL clock input
61 VPO Output Vari-pitch PLL phase error output
62 VDD1 — Digital power
63 DGND — Digital GND
64 XI Input Oscillation circuit input. 33.8688 MHz
65 XO Output Oscillation circuit input. 33.8688 MHz
66 DIN Input Digital input signal
67 DOUT Output Digital output signal
68 VDD3 — Power for internal PLL
69 DGND — Digital GND
70 LRCK Output Music data Lch/Rch selection output
71 BLCK Output Music data shift clock
72 DFCK Output AD/DA converter digital filter clock. 256 Fs
73 ADDATA Input Audio data input
74 DADATA Output Audio data output
75* FEMON Output Focus error signal monitor output
76* TOTMON Output Total signal monitor output
77* TEMON Output Tracking error signal monitor output
78* SBCK Input DIN subcode read clock. EIAJ CP-309 Format
79* SBO Output DIN subcode serial data. EIAJ CP-309 Format
80* SBSY Output DIN subcode block sync signal. EIAJ CP-309 Format
81 SFSY Output DIN subcode frame sync signal. EIAJ CP-309 Format
82 FOK Output Focus OK detection signal. "0" : Focus OK
83 SENSE Output Servo status detection signal. "1": Auto-move, auto-jump, auto-focus retraction
84 COUT Output Track cross signal output
85 MCCK Output Microcomputer clock output. Clock output is performed also when RSTX = 0.
86 DINTX Output System controller interface interruption request output terminal
87 VDD1 — Digital power
88 DGND — Digital GND
89 RSTX Input Chip reset input. "L": Reset
90 SYD0 In/Output System controller interface data bus terminal (LSB)
91~96 SYD1~SYD6 In/Output System controller interface data bus terminal
97 SYD7 In/Output System controller interface data bus terminal (MSB)
98 SYWRX Input System controller interface register writing pulse input
99 SYRDX Input System controller register read pulse input
100 SYRS Input System controller interface register selection input
Pin No. Terminal Name Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output
DM-3090
11
CIRCUIT DESCRIPTION
DM-3090(K) COVER 97.11.29 0:19 AM y[W 18

1* P96/ANEX1 Output Not used
2* P95/ANEX0 Output Not used
3 P94/DA1 Output LDVAR (laser power adjustment output)
4* P93/DA0 Output ADJS (for automatic adjustment step check)
5* P92/TB2IN Output Not used
6 P91/TB1IN Input LD SW CK input (interruption input only in single state)
7 P90/TB0IN Input ERR input (monitor PLL UNLOCK)
8 BYTE Input GND
9 CNVss Input GND
10* P87/XCIN Output ST-ID Output
11* P86/XOUT Output MD search output
12 RESET Input RESETInput
13* XOUT — Extal clock output
14 Vss — GND
15 XIN Input EXTAL (8.4672 MHz)
16 Vcc — + 3.15V
17 P85/NMI Input Connect +B
18 P84/INT2 Input DINT (interruption input from MD LSI)
19 P83/INT1 Input DSENSE (servo sense input from MD LSI)
20 P82/INT0 Input ST-ID Input (MD-ON)
21 P81/TA4IN Input CD search input (syncro REC suspension input from MD LSI)
22 P80/TA4OUT Output MD RSW Output
23* P77/TA3IN Input FSW1 (SW power frequency selection)
24 P76/TA3OUT Output Vari-pitch correspondence given (H)/not given (L)
25 P75/TA2IN Input P-DOWN (power failure detection)
26 P74/TA2OUT Output HDON (magnetic head current ON/OFF output)
27 P73/TA1IN Output LD+ (loading motor + control output)
28 P72/TA1OUT Output LD- (loading motor + control output)
29 P71/TA0IN Input CIN (track count signal input)
30 P70/TA0OUT Input INN SW (inner SW detection input)
31 P67/TXD1 Output R-DATA
32 P66/RXD1 Output R-LATCH
33 P65/CLK1 Output R-CLK
34 P64/CTS1/RTS1/ Output DSTB (system controller communication enable and communication beingexecuted)
CTS0/CLKS1
35 P63/TXD0 Output MD DATA (MD Data Output)
36 P62/RXD0 Input K DATA (system controller data input)
37 P61/CLK0 Input DSCK (system controller communication clock input)
38 P60/CTS0/RTS0 Input 4M/16M DRAM selection input
39 P57/RDY/CLK OUT Output R/P output (REC/PLAY selection)
40 P56/ALE Input FOK (focus servo status monitor input)
41* WFMI Input/Output Not used
42 AVCC Output S2 Ouput
43 AGND Output S1 Output
44 EFMAGC Output SYRS (MD-LSI register selection signal output)
45 EFMAGI Output SYRD (MD-LSI read signal output)
46 ATTR Output SYWR (MD-LSI right signal output)
47 GOUT In/Output SYS D7 (data bus 7)
48 POUT In/Output SYS D6 (data bus 6)
49 PLCK In/Output SYS D5 (data bus 5)
50 EFM0 In/Output SYS D4 (data bus 4)
51 X700KO In/Output SYS D3 (data bus 3)
IC1401 RX-iX0227AWZZ:MD System Microcomputer (IX0227AW)
Pin No. Terminal Name Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output
DM-3090
12
CIRCUIT DESCRIPTION
DM-3090(K) COVER 97.11.29 0:19 AM y[W 19

DM-3090
52 P42/A18 In/Output SYS D2 (data bus 2)
53 P41/A17 In/Output SYS D1 (data bus 1)
54 P40/A16 In/Output SYS D0 (data bus 0)
55* P37/A15 Output Not used
56* P36/A14 Output Not used
57* P35/A13 Output Not used
58 P34/A12 Output EEPRO (EEPROM protection cancel)
59 P33/A11 Output EPCS (EEPROM chip selector output)
60 P32/A10 In/Output EEPD (EEPROM sirial data output)
61 P31A9 Output EEPK (EEPROM sirial colck output)
62 Vcc Input + 3.15V
63* P30/A8 Output Not used
64 Vss — GND
65* P27/A7 Output L3 DATA (soft serial communication, 2 modes provided, LSB fast)
66* P26/A6 Output L3 MODE (soft serial communication, 2 modes provided, LSB fast)
67* P25/A5 Output L3 CLK (soft serial communication, 2 modes provided, LSB fast)
68* P24/A4 Output Not used
69* P23/A3 Output Not used
70 P22/A2 Output PCNT0 output
71* P21/A1 Output Not used
72 P20/A0 Output LDON output (H: ON)
73 P17/D15 Output ANLPTR output
74* P16/D14 Output ADPON output (for CK)
75* P15/D13 Output DAPON output (for CK)
76 P14/D12 Output DFS0 output
77 P13/D11 Output DFS1 output
78* P12/D10 Output DIG EX output (for CK)
79* P11/D9 Output DIG CD output (for CK)
80 P10/D8 Output XRST (system reset output)
81* P07/D7 Output AD MUTE output (for CK)
82* P06/D6 Output EMPHA output (for CK)
83* P05/D5 Output DA MUTE output (for CK)
84 P04/D4 Output MUTE output
85* P03/D3 Output DOUTM output (for CK)
86 P02/D2 Input TEST2 (special mode selection 2)
87 P01/D1 Input TEST1 (special mode selection 1)
88 P00/D0 Input TEST0 (special mode selection 0)
89 P107/AN7/KI3 Input AVCK3 (special mode monitor input)
90 P106/AN6/KI2 Input AVCK2 (AD/DA section 3.1V monitor input)
91 P105/AN5/KI1 Input AVCK1 (DOUT section 5V monitor input)
92 P104/AN4/KI0 Input DTEMP (temperature detection input)
93 P103/AN3 Input MINF (disc type/REC input)
94 P102/AN2 Input TEST K1 (test key input 1)
95 P101/AN1 Input TEST K2 (test key input 2)
96 AVss — GND
97 P100/AN0 Input HINF (mechanism position/HEAD position)
98 VREF — + 3.15V
99 AVcc — + 3.15V
100 P97/ADTRG Input Connect +B
Pin No. Terminal Name Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output
CIRCUIT DESCRIPTION
13
DM-3090(K) COVER 97.11.29 0:20 AM y[W 40

DM-3090
CIRCUIT DESCRIPTION
14
IC901 RH-iX0196AFZZ: System Control Microcomputer (iX0196AW)
Pin No. FunctionPort Name Input/Output
Terminal Name
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
1* P77/AN7 KEY1 Output Not used
2 P76/AN6 KEY2 Input Key entry
3 P75/AN5 KEY3 Input Key entry
4* P74/AN4 — Output Not used
5 P73/AN3 INI Input Initial setting entry
6 P72/AN2 JOG_AD Input Jog dial entry
7*,8* P71/AN1,P70/AN0 — Output Not used
9* PB3 — Output Not used
10 PB2/DA DIG SEL1 Output Digital signal selector selection signal
11* P57/SRDY3/AN15 DIG SEL2 Output Not used
12* P56/SCLK3/AN14 — Output Not used
13* P55/SOUT3/AN13 — Output Not used
14 P54/SIN3/AN12 DAC_MODE Output Externally provided DAC/ADC serial interface mode signal
15 P52/SRDY2/AN11 DAC_CLK/EX Output Externally provided DAC/ADC serial interface clock signal
16 P52/SCLK2/AN10 DAC_DATA/EX Output Externally provided DAC/ADC serial interface clock signal
17* P51/SOUT2/AN9 — Output Not used
18 P50/SIN2/AN8 DFS0/DFS1 Input EMPHASIS information from MD
19 P67/SRDY1/CS/ DSTRB Input MD serial interface strobe signal
SCLK12
20 P66/SCLK1 DSCK Output MD serial interface clock signal
21 P65/SOUT1 K-DATA Output MD serial interface transmission signal
22 P64/SIN1 MD-DATA Input MD serial interface reception signal
23 P63/CNTR1 MD-LO/EJ Output MD loading power voltage selection signal
24* P62/CNTR0 — Output Not used
25* P61/PWM — Output Not used
26* P60 — Output Not used
27* P47/T3OUT — Output Not used
28* P46/T1OUT — Output Not used
29 P45/INT1/2CR P IN Input Power failure detection
30* P44/INT4 P.CNT Output Power control
31 P41 P-OUT Output MD power failure detection signal
32 P42/INT2 RX-IN Input Remote control loght reception signal
33 P41 P-MUTE Output Audio mute control signal
34 P40/INT0 — Input GND
35 RESET RESET Input RESET signal entry
36 PB1/Xcin Xcin Input Sub clock IN connection (32.7k)
37 PB0/Xcout Xcout Output Sub clock OUT connection (32.7k)
38 Xin Xin Input Main clock IN connection (8M)
39 Xout Xout Output Main clock OUT connection (8M)
40 VSS VSS Input GND
41 P27 SERCH Output CD to MD search monitor signal
42 P26 LOAD Input MD loading detection
43 P25 S-ID Output CD to MD start ID signal
44 P24 MD RESET Output RESET signal to MD
DM-3090(K) COVER 97.11.29 0:20 AM y[W 39

DM-3090
CIRCUIT DESCRIPTION
15
Pin No. FunctionPort Name Input/Output
Terminal Name
72-80 P97/SEG23- S0-S8 Output Segment for FL drive
P90/SEG16
81-88 P87/SEG15- S9-S16 Output Segment for FL drive
P80/SEG8
89,90 PA7/SEG7, S17,S18 Output Segment for FL drive
PA6/SEG6
91 VCC VCC Input +5V
92-97 PA5/SEG5- S19-S24 Output Segment for FL drive
PA0/SEG0
98 VEE VEE Input -30V
99 AVSS AVSS Input GND
100 VREF VREF Input +5V
45-54 P23/DIG19- UDIG0-UDIG9 Output Digit for FL drive
P12/DIG10
55,56 P11/SEG41/DIG9, UDIG10,UDIG11 Output Digit for FL drive
P10/SEG40/DIG8
57-60 P07/SEG39/DIG7- UDIG12-UDIG15 Output Digit for FL drive
P04/SEG36/DIG4
61-64 P05/SEG35/DIG3- S35-S32 Output Segment for FL drive
P00/SEG33/DIG0
65-72 P37/SEG31- S31-S25 Output Segment for FL drive
P30/SEG25
DM-3090(K) COVER 97.11.29 0:20 AM y[W 42

DM-3090
TROUBLE SHOOTING
16
BLANK MD
Can't COPY
Can't EDIT
Can't REC
DEFECT
Din UNLOCK
DISC ERR
DISC FULL
FOCUS ERROR
MECHA ERR**
NAME FULL
NO DISC
NOT AUDIO
PLAYBACK MD
PROTECTED
TEMP OVER
TOC ERR**
TOC FULL**
TOC W ERROR
U TOC ERR**
U TOC W ERR
? DISC
0-00:00
**Number or symbol
Error messages Meaning Remedy
Nothing is recorded.
•
•
No copy can be made because of the SCMS copyright
system.
• A track cannot be edited.
• Recording cannot be pertormed correctly due to
vibration.
• Since this MD has scratches on it, the recording
operation was skipped.
• Poor connection of the digital cable.
• The disc damaged.
• The TOC information is not recorded on the disk or the
date contains.
• The MD is out of recording space.
• A MD has not been loaded.
• The disc data cannot be read.
• There is a mechanical problem and the disc is working
properly.
• The number of characters for the MD name or track
name exceeds 40.
• MD has not been loaded.
• MD data cannot be read.
• The data recorded on this disc is not audio data.
• You tried to record on a playback-only disc.
• The MD is write protected.
• The temperature is too high.
• The MD is excessively damages
• Thereisnospaceleftforrecordingcharacterinfomation
(track names, disc names, etc.)
• Trouble has occurred.
• The TOC infomation on this disc does not meet the
MD specifications or it cannot be read.
• The TOC infomation could not be created properly due
to a mechanical shock or to scratches on the disc.
• The MD contains an error.
• Music is not being recorded.
• Replace the MD wiht a recoded disc.
• Record using the analogue cable.
• Change the stop position of the track and then try
editing it.
• Stop vibration and try again.
• Replace the disc with another recordable disc.
• Connect the digital cable securely.
• Reload the disc or replace it.
• Replace the disc with another recordable disc.
• Reload the MD.
• Reset the microprocessor referring to "If a problem
occurs".
• Shorten the MD or track name.
• Load a MD.
• Reload the MD.
• Select another track.
• Replace the MD.
• Raplace it with a recordable MiniDisc.
• Move the write protection tab back to its original
position.
• Turn off the power, and wait for a whilst.
• Replace the disc with another disc.
• Replace the MD with another recordable disc.
• Contact a KENWOOD Authorized Sevicing Dealer or
KENWOOD Authorized Sevice station.
• Replace it with another MD.
• Erase all the data, and try recording.
• Turn off the power, and try to write the TOC-
information again. (Remove any source of shock or
vibration whilst writing.)
• Replace the disc with another disc.
• Replace the disc with a recorded disc.
When an error message is displayed, proceed as follows:
DM-3090(K) COVER 97.11.29 0:20 AM y[W 41

• Defect occurred successively 10 times during REC-PLAY.
• As a result of occurrence of defect during REC-PLAY the
recordable cluster became zero.
• Adress is unreadable. REC state connot be set for 20 seconds
although retry is repeated.
• The following judgement is made according to the channel
status of digital signal which was input from D-IN during REC-
PAUSE or REC-PLAY.
(1) Other than audio signal
(2) Other than signals of home-use appliances
(3) Copy NG due to inversion of copy bit in CD.
• The digital signal which was input from D-IN during REC-
PAUSE, REC-PLAY or CD FUNC playback caused the
following.
(1) PLL of digital IN was unlocked.
(2) Locking occurred in condition other than FS = 44.1 kHz
• There were no areas to record music or character
infomation.(music name, disc name, etc.) during REC-PLAY.
• When an attempt to start is made, recordable area does not
remain.
• ETNO > LTNO
• FTNO ≠0 or 1
• UTOC recorded on disc could not be read.
• Start address > End address
• Any data of UTOC 0 to 4 looped.
• Nonaudio data was recorded in the track mode of currently
selected TNO.
• Data "MINI" of system ID which has been written in TOC with
ASCII code is not correct.
• The disc type written i TOC does not correcpond to pre/
mastered MD, recording MD and hybrid MD.
• When an attempt to set REC-PAUSE was made, there were no
recordable areas.
• An attempt to set REC-PAUSE or to start editing was made on
the playback-only disc.
• An attempt to record or edit was made on the record/playback
disc with its careless rease preventing tab being in rease
preventing state.
• An attempt was made t oedit the track which was write-
protected by information written in UTOC.
• Specific editing conditions were not satisfied.
• Owing to occurrence of some trouble internal temperature of
set (MD unit) rose excessively.
• Read data was not correct or data could not be read correctly.
• Trouble occurred during recording if music data, resulting in
EXPLANATION OF ERROR DISPLAY
Error display Errors Corrective action
Can't REC
Can't COPY
Din UNLOCK
TOC FULL
UTOC ERR R
UTOC ERR A
UTOC ERR L0~4
NOT AUDIO
? DISC
DISC FULL
PLAYBACK MD
PROTECTED
Can't EDIT
TEMP OVER
DISC ERR RD
PA
• Check that the disc is free from flaw, dust
and fingerprint.
Check whether there is any black spot.
Check for disc disalignment and run-out.
• Check whether CD is copy-inhibited one.
(An exabple: CD-R)
• Check whether there is any abnormality
in the D-IN signal line.
• Replace the disc with a recording/
playback disc in which an area to register
UTOC remains.
• UTOC data is not normal. Replace the
disc with other disc.
• UTOC data is not normal. Replace the
disc with other disc.
• UTOC data is not normal. Replace the
disc with other disc.
• Select other TNO or replace the disc with
other disc.
• The loaded disc is not applicable.
Replace the disc, and check.
• Replace the disc with other recording disc
in which recording area remains.
• The loaded disc is a Playback-only disc.
Replace the disc with a recording disc.
• Return the careless erase preventing tab
to its initial position, and redo.
• The track on which an attempt to edit was
made is a write-protected track. Redo on
another track.
• The applied operation procedure is not
proper. Redo, applying the ocrrect
procedure.
• Check by troubleshooting.
• Check whether the ambient temperature
is too high.
• Data of TOC or UTOC is not normal or
disc las flaw. Replace the disc with other
record failure.WR disc.
DM-3090
17
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 22

• UTOC was read but total TNO and the number of characters of
NAME was 0?
• Focusing error was caused by shock during REC-PLAY.
• Although UTOC can be read but UTOC cannot be rewritten.
• Data of EEPROOM is not correct.
Error display Errors Corrective action
BLANK MD
DEFECT
TOC W ERROR
MD ERROR
• Perform recording to check that the disc
is recordable disc.
• Check that the disc is free from flaw,
dust, fingerprint and black spot. Check
for disc disalignment and run-out.
• Check that the record head contact is
normal. Check that there is no broken
wire between PWB and the recording
head.
• Once reset, and redo. If error occurs
persistently, replace EEPROM.
EXPLANATION OF MECHANISM ERROR
Error display Errors
M E C H A _ E R R 1 _ * Ejection failure
M E C H A _ E R R 2 _ * Head-up failure
M E C H A _ E R R 3 _ * Head-down failure
HINF (IC1401 97 PIN)
* = E Ejection completion position < 1.3 V
* = MHorizontal midway position > 3.06 V
* = L Load completed position 1.853~2.48 V
* = DHead-down position 1.3~1.853 V
• TOC was read but data was not correct.
• TOC could not be rad.
• Trouble occurred during rewriting of UTOC, resulting in UTOC
rewriting failure.
• After the disc was loaded, focusing failure occurred.
TOC ERR S
TOC ERR R
TOC ERR T
UTOC W ERR
FOCUS ERROR
• The TOC information recorded on disc
does not conform to the MD standard.
Replace the disc with other disc.
• The disc has flaw. Replace the disc with
other disc.
• The disc has flaw. Replace the disc with
other disc.
• Check that the disc is free from flaw,
dust, fingerprint and black spot.
Check for disc disalignment and run-out.
DM-3090
18
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 23

Is power turned on when the remote control or main unit
POWER button is pressed? No Check as stated in item "POWER turning-on failure".
Check as stated in "Disc Loading is nor normal".
No
Yes
Is disc loading normal?
Yes
No Check as stated in item "Playback state cannot be set".
Is playback state set when the PLAY/PAUSE button is
pressed?
Is audio output normal? Check as stated in item "Audion playback circuit".
No
Is record and playback operations normal?
Yes
Check as stated in item "Record playback operations".
No
Yes
When MD fails operate
If the objective lens of optical pickup is contaminated, MD may fail to operate. At first, clean the objective lens to check playback
operation. If MD fails persistently to operate, perform checks as follows.
Ifdustorforeignsubstanceisaccumulatedonthepickuplens,playbackisdisturbedandindicationofTOC(contentoftracks)may
be disabled. Before adjusting check that the lens is clean. If the lens is contaminated, treat it as follows.
Turnoffpower supply,impregnatethe lenscleaningpaper withasmallquantityofisopropylalcohol, andgently wipethelenswith
it with due care so that the lens is not damaged. At this time do not touch the lens directly with your finger.
• Power turning-on failure.
Is normal operation performed when the main unit POWER is
pressed? Yes Check the remote controller and display PWB.
No
Check the main PWB and CNS1902.
Is +5V applied to the pins 15 and 16 of CNS1902?
No
Is pulse given to the pin 5 of CNS1902? Check the display PWB, main PWB and CNS1902.
Is +3.2V applied to the pin 62 of IC1401? Check the periphery of IC1401.
Yes
Yes No
Is 8.4672 MHz pulse applied to the pin 15 of IC1401? Check IC1201.
No
Yes
Yes
No Check IC1401.
Is pulse output from the pin 34 of IC1401?
Yes
No
Check CNP471 and system PWB.
Yes
OK
DM-3090
19
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 26

• Disc loading is not normal.
Is disc loaded when it is inserted?
No
Yes
No Check IC1401.
No Check CNP1601 and SW1956.
Yes
No Check CNP1604 and IC1601.
Yes
Check CNP1604 and CN1604
No
Yes
No
Yes
Is change observed on the pin 23 or 24 of IC1601?
Is change observed on the pin 30 or 31 of IC1601?
Is ejection performed when the MD taking-out button is
pressed?
Yes
Disc retracts soon after completion of disc ejection.
Yes
Check CNP1601 and SW1956.
Is the pin 4 of CNP1601 set to L state?
• Playback state cannot be set.
Is it impossible to set both high reflection disc and low
reflection disc to playback state? Yes Check as stated in item "TEST mode check".
No
Only the high reflection disc cannot be played back.
Yes
Is 1.02V±0.3V (high reflection disc) applied to the pin 93 of
IC1401 in the TEST mode where the high reflection disc has
been inserted?
Only the low reflection disc cannot be played back.
Is 3.2V±0.3V(record enabied) or 2.06V±0.3V (record disabled)
applied to the IC1401 pin 93 after the low reflection disc has been
set?
No
Yes
No
After adjustment check as stated in item "Normal playback".
Check SW1951A/B, mechanism switch PWB, and CNP1601.
Yes
Yes No
DM-3090
20
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 27