Service manual
– 27 –
MD-SR50H/50W/60E/60W
7
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Figure 27 SCHEMATIC DIAGRAM (2/2)
6
5
4 3
2
1
TP842
TP841
TP805
5
4 3
2
1
6
5
4 3
2
1
6
5
4 3
2
1
8
7
6
5
4
3
2
1
3
2
1
4
3 2
1
5
4 3
2
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
5
4 3
2
1
TP729
5
4 3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
TP500
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
TP803
TP804
24
23
2 2
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
TP702
TP704
TP706
TP708
TP701
TP705
TP707
TP703
TP714
TP711
TP713
TP712
9
8
7
6
5
4
3
2
1
4
3
2
1
TP462
TP459
TP458
TP457
TP456
TP455
TP454
TP461
TP451
TP452
TP453
TP463
13
12
11
10
9
8
7
6
5
4
3
2
1
TP460
TP486
TP488
TP481
9
8
7
6
5
4
3
2
1
TP489
TP482
TP487
TP483
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4 3 2 1
3
2
1
TP771
TP772
8
7
6
5
4
3
2
1
TP721
TP722
TP723
TP724
TP725
TP726
TP802
TP801
3
2
1
5
4
3 2 1
6
5
4 3
2
1
6
5
4
3 2 1
8
7
6
5
4 3 2 1
5
4 3
2
1
4
3 2
1
6
5
4 3
2
1
6
5
4 3
2
1
TP809
6
5
4 3
2
1
TP412
GND
I/O4
I/O3
CAS
OE
A8
A7
A6
A5
A4
VCC
A3
A2
A1
A0
A9
RAS
WE
I/O2
I/O1
VCOM
AOUTL
PWAD
PWDA
VSS
DEM1
DEM0
SDTO
SCLK
LRCK
AINL
AINR
N.C.
ATT
LIN
LLPFO
L-
L + R +
R-
RLPFO
RIN
LHPVEE
LHPVCC
DAT
CLK
LAT
RHPVEE
RHPVCC
HP
BEEP
LPF
ATT
AMPuGAIN SEL.
AMPuGAIN SEL.
LOGIC
BIAS
N.C.
L
R
GND
VCC
GND
Vout
VEE
VCC
ROUT
DGND
RIHP
LOUT
LIHP
AGND
RI LI
STAND
ERRAMP
VREF
CTRL
CMP
RSFF
Q R
S
BUF
OUT
BY
EIP
EIN
OSC
ROSC
VCC
GND
EO
EO
GND
VCC
ROSC
OSC
EIN
EIP
OUT
CTRL
STAND
BY
BUF
S
R Q
RSFF
CMP
VREF
ERRAMP
GND
VCC
G1
G2
S2
S2
S1
S1
D
D
OUT
VDD
VSS
VSS
VDD
OUT
V+
V-
O
-
+
+
-
O
C
.
N.C.
N.C.
N.C.
N.C.
VCC2R0V
+2R5
PCNT1
PCNT2
RCPCNT
PLVON
CHGCNT
PLVDRY
CHGON
DCVDD
VG
+2R7
HREC
HPLAY
HKEY1
HKEY2
VGBATT
VCCBATT
VCC4R5
DCNT1
OPTCNT
DIN
EMPH1
ADDATA
DADATA
LRCK
DFCK
BCLK
DAPON
ADPON
VCCDRAM
VCCMICOM
-2R5
VCCADDA
EMPH0
DSPDAT
DSPSCK
DSPSTB
DSPRST
PBAULT
PBMUTE
BEEP
RPLAY
RKEY
AURESET
MCPGIN
INPGIN
INPGCK
AUDATA
AUSCLK
RCAULT
V
AR
G
CNT
E
Y2
E
Y1
M
P
D
ON
O
PICGA
P
LVON
DRY
PCNT1
PCNT2
RCPCNT
BATTERY
TERMINAL,-
R-ch
L-ch
R-ch
L-ch
2.0V
+2.7V
+2.7V
L-ch
R-ch
KEY
PLAY
LCD ASS`Y
LCD
LCD
DRIVER
GND
P-MODE
ENTER
DISPLY
VOL DOWN
VOL UP
BASS
EDIT
REC
SKIP DOWN
SKIP UP
STOP
PLAY
KEY FLEXIBLE
PWB ASS'Y
13
12
11
10
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
N.C.
LPF
N.C.
AOUTR
VDD
MCLK
SDTI
BATTERY
TERMINAL,+
5
7
8
6
D
G
S
+B
D
G
S
+B
+B
TP728
TP727
+B
-B
+B
+B
+B
-B
-B
-1.15V
0V
-1.6V
0V
5.4V
5.1V
2.1V
0V
1.6V
0V
4.5V
0V
0V
0V
0.6V
3.4V
2.9V
4.5V
3.9V
4.5V
3.9V
4.5V
4.5V
3.9V
4.5V
4.5V
1.83V
0V
0V
C202
47/6.3
R202
33
IC202
IX2567AF
4M D-RAM
R454
56K
R452
8.2K
R453
18K
R451
5.6K
R458
56K
R457
18K
R456
8.2K
R455
5.6K
CN451
CN482
C482
1
C481
1
C701
10/6.3
C704
47/6.3
C702
10/6.3
R702
22
C703
0.01
IC701
IR3R54N
AUDIO AMP.
R703
100K
R701
100
C734
0.1
C733
0.1
R720
8.2K
R712
5.6K
R711
5.6K
R719
8.2K
L710
47
R715
100K
R716
100K
R718
1K
C713 1
C714
1
Q711
RN1444 A
R717
1K
C715
0.1
C712
100P
(CH)
C711
100P
(CH)
R713
10K
C726
3.3/10
R725
100
R726
39K
Q721
2SD1979S
C725
3.3/10
L702
L703
R714
10K
L704
J701
OPTICAL/
LINE IN
J702
MIC IN
C722
3.3/10
R724
6.8K
R723
6.8K
C724
0.001
C723
0.001
C721
3.3/10
C731
0.22
R727
8.2K
R728
1K
R729
2.7K
R730
2.7K
J703
REMOTECONTROL
/HEADPHONES
C491
0.1
D494
MA8075M
L491
33
R492
1K
D492
MA8075M
C492
1
D496
MA8075M
D495
MA8075M
R768
4.7
R767
4.7
C766
0.22
C765
0.22
R766
15
R765
15
C761
2.2
IC703
IR3R59N
AUDIO AMP.
C753
1
C762
2.2
R758
100
R761
220K
C754
1
R762
91K
R754
150K
R757
2.2K
C760
0.1
C758
1
L500
47µH
C506
0.001
C551
0.1
C505
0.001
C500
10/6.3
C511
1
C501
0.0022
R501
470
C509
2.2
C510
2.2
C502
0.0022
R502
470
C503
3.3/10
IC501
AK4550VT
C774
1
IC771
62GR2522
2.5V REGULATOR
C773
0.22
C206
1
IC203
62FP2002
2V REGULATOR
L871
0.47µH
C872
10/10
L771
100µH
C771
47/6.3
C869
47/6.3
C868
1
L862
100µH
D801
F05J2L
R801
1.1A
R803
1.2K
L801
R808
1
R810
1
C803
0.1
IC803
S80819LN
RESET IC
L800
J801
DC IN
Q891
2SA1873GR
R802
560
D802
MA8051M
R809
1
R811
1
D803
RB520S30
R806
56K
C801
1
C818
0.1
IC809
RN4904
DIGITAL TRANSISTOR
R818
3.3M
R819
22K
IC892
HN1C01FU
TRANSISTOR
R293
2.2K
R294
100K
R296
100K
R295
100K
R281
22K
Q250
2SA17457
IC251
FTD2017
N-ch MOS FET
C802
0.01
IC801
62RP2002
2.0V REGULATOR
Q803
UN5213
R292
100K
R286
2.2K
R282
1M
C252
0.1
R252
150K
R257
27K
R272
100
R254
22K
D251
1SS400
R253
39K
IC256
RN4911
DIGITAL
TRANSISTOR
IC255
NJM022V
R266
56K
R262
68K
R263
68K
R271
68K
R270
68K
R291
100
C291
1
IC257
S80808LN
C254
0.1
R250
100
C255
0.1
C253
0.1
R255
4.7K
R256
56K
Q251
2SD1819AS
R285
100K
C251
0.1
R251
100
R261
1K
R283
100K
R287
560K
R284
390K
Q257
2SA1832 GR
IC253
RN4904
IC258
HN1C01FU
IC260
RN4904
R269
30K
R267
10K
C848
1
R841
100K
C844
10/6.3
IC842
XC62HS02
2.35V
REGULATOR
D822
F10J2E
C832
0.1
D831
HRB0103B
C835
0.1
C834
0.1
D832
HRB0103B
C833
0.1
C838
0.1
R833
47
D823
F10J2E
C828
1
C825
1
L821
10µH
IC821
CPH3403
N-CH MOS
FET
D821
D1FH3
C821
3.3
C822
22/6.3
C823
220/4
W
403
D
DETECTION
22K
1
7
R422
100K
SW402
HOLD
L851
22µH
R443
12K
R857
330K
C856
330P(CH)
R855
390K
R856
10M
R854
10K
C857
560P
C851
3.3
C852
22/6.3
D851
D1FH3
IC851
CPH3403
C862
1
C863
1
D862
F10J2E
D861
F10J2E
C853
220/4
IC852
IR3M14N
DC/DC CONVERTER
C830
1
R823
270K
R827
220K
R825
300K
R826
10M
C826
100P(CH)
R824
10K
C827
220P
(CH)
IC822
IR3M14N
DC/DC CONVERTER
C860
1
R832
180K
C839
0.33
R853
270K
R831
180K
C850
0.1
R850
100K
F841
0.4A,
DC 60V
C841
1
L841
4.7
IC841
6372C281
2.8V UP
CONVERTER
D842
HRB0103B
C847
1
C846
0.1
D841
F10J2E
C845
0.1
R844
47
C842
33/6.3
C843
0.22
C876
1
Q461
2SD1819AS
R462
27K
R460
68K
C849
220/4
C840
220/4
Q801
2SJ520TL
R807
22K
IC802
HN1C01FU
TRANSISTOR
C804
0.1
R813
10K
R812
10K
R814
10K
R815
10K
R816
1.5K
C837
1
C836
1
IC873
62GR4522
R871
10K
IC871
TC7S86FU
EXCLUSIVE OR GATE
IC259
HN1C01FU
POWER
TRANSISTOR
D281
1SS400
R288
47K
C259
0.1
R277
39K
R279
100
IC501: AD/DA CONVERTER
IC253: DIGIITAL TRANSISTOR
IC258: TRANSISTOR
IC255: OP AMP
IC260: DIGIITAL TRANSISTOR
4.5V REGULATER
Q721:RIPPLE FILTER
N-CH MOS FET
RESET