Service manual
MD-MT821/W
– 32 –
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• NOTES ON SCHEMATIC DIAGRAM can be found on page 28.
Figure 32 SCHEMATIC DIAGRAM (3/4)
P30
P32
P31
• The numbers 1 to 18 are waveform numbers shown in page 37.
MD-MT821 8.2Ω
MD-MT821W 18Ω
R765,766
L702
L703
L704
L714
L713
L712
L711
L452
L453
L454
L457
L458
L456
F800
T1A L
25VDC
!
8
6
7
C805
100/6.3
R844
560K
D804
1SS400
D803
1SS400
R802
1K
R804
680
R810
5.6K
IC801
HN1C01FU
POWER
TRANSISTOR
6
5
4 3
2
1
D800
1SS360
R809
2.2K
R806
300K
C807
0.01
R805
680K
TP801
TP802
TP805
C841
10/6.3
C842
1
R458
56K
R457
18K
R456
8.2K
R455
5.6K
R453
18K
R452
8.2K
R451
5.6K
TP461
TP463
TP462
TP459
TP458
TP457
TP456
TP455
TP454
TP451
TP452
TP453
TP807
C806
3.3
D801
SB10015C
IC802
FDC634P
CONSTRANT
CURRENT DRIVE
D431
1SS361
C431
0.47
R431
330K
R894
22
C891
0.47
Q891
2SA1873GR
R892
82
D841
RB731U
6
5
4 3
2
1
R812
100K
R808
1M
C808
1
R807
100K
IC841
XC66DS01
5
4 3
2
1
R841 100K
R842
100K
R843
100K
Q841
RN1104
R811
100K
R801
2.2K
R800
22K
C801
0.1
R816
24K
D802
015Z5.1Y
TP803
TP804
TP810
TP811
TP812
TP808
TP809
R815
56K
TP481
TP482
TP483
TP485
TP484
C481
0.1
TP486
C200
1
IC200
62FP2002
POWER DRIVE
3
2
1
C
202
7
/6.3
I
C404
1G00DC
N
D GATE
5
4
TP405
T
P406
R
405
10K
2
02
D-RAM
24
23
22
21
20
19
18
17
16
15
14
13
R424
22K
1
5
SW401
EJECT
3
2
5
4
3 2 1
6
5
4
3 2 1
7
6
5
4
3
2
1
CN482
13
12
11
10
9
8
7
6
5
4
3
2
1
CN451
C774
1
C773
0.22
IC771
TK71225M
2.5V
REGULATOR
5
4 3
2
1
C775
0.01
C507
10/6.3
C504
3.3/10
C503
3.3/10
C508
1
C500
10/6.3
IC501
AK4519VF
AD/DA
CONVERTER
R500
4.7
C505
0.001
C506
0.001
2 4
3 2
2
2
2
1
0
2
1
9
8
1
7
1
6
1
1
5
4
1
1
3
12
11
10
9
8
7
6
5
4 3 2 1
C509
2.2
C510
2.2
R769
15K
R770
15K
R763
68
C765
0.33
R767
1K
R764
68
C766
0.33
R768
1K
L752
10µH
L751
10µH
R753
100K
IC701
IR3R54N
AUDIO
AMP
R703
100K
C758
3.3/10
C755
0.01
C753
1
C702
10/6.3
R701
22
C756
0.68
R762
4.3K
R761
4.3K
R754
270K
C757
0.68
IC703
IR3R54N
AUDIO AMP
C701
10/6.3
C734
0.1
C733
0.1
R720
8.2K
R719
8.2K
R712
5.6K
R711
5.6K
C754
1
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
R893
1K
R891
1K
D493
015Z5.1Y
D491
015Z5.1Y
C491
0.1
D494
15AZ7.5Y
D492
15AZ7.5Y
R492
1K
TP721
TP727
TP728
TP723
TP724
TP722
TP725
TP726
J703
REMOTE CONTROL/
HEAD-PHONES
8
7
6
5
4
3
2
1
L710
47
J702
MIC IN
4
3
2
1
Q711
RN1444 A
C713
1
C715
0.1
TP703
TP705
TP708
TP701
TP709
TP704
TP702
TP707
R715
100K
R716
100K
J701
OPTICAL/
LINE IN
9
8
7
6
5
4
3
2
1
R725
100
C725
3.3/10
R482
33K
R481
33K
R713
10K
R765
*
R766
*
R717
1K
C703
0.01
R702
22
R729
2.7K
R730
2.7K
C721
3.3/10
C722
3.3/10
C738
R728
1K
C731
0.22
R727
8.2K
C723
0.001
R723
6.8K
R724
6.8K
C724
0.001
C752
0.082
C751
0.082
4
1
J801
DC
JACK
3
2
1
C206
1
IC203
62FP2002
2V
REGULATOR
3
2
1
L771
100µH
C762
2.2
C761
2.2
C771
47/6.3
TP771
C868
1
C869
47/6.3
TP772
C759
0.027
R756
27K
C760
0.027
R757
27K
L871
0.47µH
C872
10/10
R832
200K
C833
0.33
C855
180P
(CH)
C836
0.1
C837
0.1
D836
MA793
R826
220K
C823
0.1
R821
100K
IC830
IR3M12N
DC/DC CONVERTER
C831
1
C821
56P
(CH)
R823
100K
R852
100K
R851
10K
C858
47P(CH)
C859
100P(CH)
R858
33K
R860
33K
C826
220/4
C825
2.2
D821
F10J2E
L821
22µH
IC821
NDS332P
POWER DRIVE
R825
10M
R824
270K
C822
10P
(CH)
D851
1SS389
R857
100K
C854
0.01
L851
4.7µH
IC851
NDS331N
POWER DRIVE
C856
1
D852
U1FWJ44N
L852
10µH
R855
300K
C857
10
C853
47P(CH)
R853
300K
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
C871
1
L862
100µH
R831
180K
13
12
11
10
9
8
7
6
5
4
3
2
1
7
6
5
4
3
2
1
R502
470
R501
470
C502
0.0022
C501
0.0022
C511
1
L500
22µH
TP500
C711
100P
(CH)
C712
100P
(CH)
C714
1
R714
10K
R726
39K
C726
3.3/10
Q721
2SC4213 B
TP714
TP713
TP712
TP711
TP729
IC871
TK71345M
4.5V REGULATOR
(ON/OFF)
5
4 3
2
1
R872
100K
D861
F10J2E
C861
1
DADATA
VCC1
HKEY2
HKEY1
HSTOP
HPLAY
HREC
RESET
HREC
RPLAY
HPLAY
PCNT1
DCI
DRY
INN
BCLK
LRCK
DAPON
ADPON
DIN
DFCK
ADDATA
OPTCNT
EMPH1
RDATA
DRY
DCI
INN
T
EMP
L
DVAR
H
KEY2
H
KEY1
S
E
+2.7V
+2.7V
+2.5V
GND
GND
I/O4
I/O3
CAS
OE
A8
A7
A6
A5
A4
A9
VCC
LCD
LCD
DRIVER
EMPH0
RI LI
LI
RI
ELON
ELLVL
RKEY
RPLAY
KEY
L-CH
R-CH
NC
L
R
GND
VCC
GND
Vout
DSPDAT
DSPSCK
DSPSTB
INPGCK
INPGIN
C
2R5V
MCPGIN
R-CH
L-CH
RDATA
PLAY
L-CH
R-DH
NC
NC
NC
DINT
ROUT
RIHP
LOUT
LIHP
AGND
VEE
DGND
VCC
NCNC
AGND
LIHP
LOUT
RIHP
ROUT
VCC
VEE
DGND
NC
NC
SDTO
SCLK
LRCK
MCLK
AINL
VCMR
VCML
AINR
VRAD
VRDAVA
VB
AGND
VCOM
AOUTR
DEM0
AOUTL
SDTI
VD
DGND
PWAD
PWDA
PBMUTE
RESET
BEEP
RCAULT
AU DATA
AUSCLK
PBAULT
RCPCNT2
Buf
VREF
LVS
OSC
OSCPLS
OSCI
OSC
RDB
Buf Buf
DELAY
DELAY
–
–
–
–
–
+
+
+
+
+
OSCI
VCC
VREF
EIP2
EIN2
EO2
PVCC
O2
PGND
LVCC
CTL2
CHG1
PGND
VREG1
REG1
OD1
O1
GND
EO1
EIN1
EIP1
CTL1
RDB
OSC
NC
NC
DCNT1
2.0V
EDIT
DISPLAY
SKIP DOWN
SKIP UP
REC
MODE
GND
ENTER
BASS
PLAY
STOP
VOLUME DOWN
VOLUME UP
KEY SWITCH
FLEXIBLE PWB ASS'Y
TERMINAL,
BATTERY+
TERMINAL,
BATTERY–
DEM1
CMODE
C800
1
RESET 2.35V
REGULATOR
+B
+B
+B
LCD ASS'Y
EXTENSION
BATTERY
TERMINAL
*
Serrial 903xxxxx
Serrial 904xxxxx~