Sony STR-MD777 Service Manual ▷ View online
– 9 –
Pin No.
Pin Name
I/O
Function
91
CD RESET
CHECK
O
CD reset check signal output to the equipment connected to system control connector (CN105)
92
MAIN
TR-RELAY
O
Power on/off control signal output of the power transformer (T902)
“H” output when power on (relay (RY901) on)
“H” output when power on (relay (RY901) on)
93
SP-RELAY
O
Relay drive signal output of the speaker protect relay Not used (open)
94
STK-MUTE
O
Muting control signal output of the power amplifier Not used (open)
95
MDCD-POWER
O
MD/CD power on/off control signal output to the equipment connected to system control
connector (CN105)
connector (CN105)
96
MDCD-POWER
O
Not used (open)
97
FL-POWER
O
Not used (open)
98
LINE MUTE
O
Audio line muting control signal output terminal “L”: muting on
99
VG POWER
O
Filament drive power on/off control signal output for the fluorescent indicator tube (FL601)
“H”: power on
“H”: power on
100
VSS
—
Ground terminal
– 10 –
• Circuit Boards Location
SUB POWER board
SP board
TUNER (TU901)
GEQ board
POWER board
MAIN board
TA SECONDARY board
EDIT FL board
TA PRIMARY
board
board
MD KEY board
CD KEY board
REC MODE
KEY board
KEY board
FUNCTION
board
board
SW board
STR FL board
STR-MD777
– 11 –
– 12 –
4-2.
BLOCK DIAGRAM – MAIN Section –
INPUT SELECTOR,
GRAPHIC EQUALIZER,
ELECTRICAL VOLUME
ELECTRICAL VOLUME
IC101
05
A
(Page 13)
•
SIGNAL PATH
: CD
: MD
: TAPE
: DVD/VIDEO
: TUNER
LY
LX
SY
SX
4
5
1
2
6
+5V
CLK
+5V
X401
12.5MHz
X402
32.768kHz
–2
RY301
–1
OUTPUT
OFFSET
OFFSET
OVER
LOAD
LOAD
AC OFF
OUT
POWER AMP
IC301
PROTECTOR
IC302
STBY
IN
OUT
FOUT2
VOL
IN2
IN2
TU901
FM/AM TUNER UNIT
L
R
IN A2
J101 (1/2)
R-CH
R-CH
I2C-DA
TA
I2C-CLK
D
ATA
R-CH
R-CH
CLOCK
LA
TCH
BB A2,
BB B2
REC B2
REC A2
ST
-CE
ST
-CLK
ST
-DIN
ST
-DOUT
73
MDCD-POWER
95
CD RESET CHECK
91
I2C-BUSY
72
75
7
2
6
3
48
1
6
2
4
1
6
10
33 32 34
AMP-DA
TA
AMP-CLK
AMP-CE
69 70 77
X2
X1
38
39
XT2
XT1
41
42
LINE MUTE
98
57
58
42
BUF
OUT2
Q201
FEED BACK
SWITCH
36
41
32 35 34 33
31 30 29
69
IN F2
64
IN D2
66
IN B2
68
IN C2
67
IN E2
65
L
CD
AUDIO IN
R
L
MD
AUDIO IN
R
J101 (2/2)
R-CH
R-CH
R-CH
D191
SPEANA FOUT
B
(Page 14)
AC OFF MUTE
L
MD
AUDIO OUT
R
L
J201
SPEAKER
IMPEDANCE
USE 6 – 16
Ω
CN104
CONTROL 1
CN103
TAPE CONTROL
ONLY FOR TC-PX100
J601
PHONES
R
L
TAPE
AUDIO OUT
R
J102 (1/2)
R-CH
R-CH
R-CH
L
TAPE
AUDIO IN
R
L
DVD/VIDEO
AUDIO IN
ANTENNA
FM 75
Ω
AM
R
MUTE
STEREO
TUNED
DIN
DOUT
CLK
CE
TUNED
STEREO
ST
-MUTE
INPUT
SELECTOR
SOUND
CONTROL
CIRCUIT
GRAPHIC
EQUALIZER
CONTROL
CIRCUIT
VOLUME
CONTROL
CIRCUIT
BASS BOOST
CONTROL
CIRCUIT
MUTING
Q111
STANDBY
SWITCH
Q331, 332
OVER LOAD
DETECT
Q301
BUFFER
Q142
BUFFER
Q141
BUFFER
Q143
MUTING
CONTROL SWITCH
Q191
CPU
INTERFACE
J102 (2/2)
R-CH
+
R-CH
R-CH
+
+
39, 38
R-CH
D303
D302
D353
R-CH
+
D352
+
–
+
–
DATA
BUSY
PC POWER REQ
4
5
1
2
+5V
CLK
+5V
DATA
BUSY
CN105 (1/2)
(TO HMC-MD777)
SYSTEM CONTROL
2
8
7
9
MDCD POWER
I2C CLK
I2C DATA
6
CD RESET CHECK
I2C BUSY
PC POWER REQ
IIC BUS EXTENDER
IC142
SYSTEM CONTROLLER
IC401 (1/2)
SY
LX
LY
SX
6
2
7
3
IIC BUS EXTENDER
IC141
– 13 –
– 14 –
STR-MD777
4-3.
BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
SYSTEM CONTROLLER
IC401 (2/2)
05
A
(Page 12)
B
(Page 12)
A
B
KEY1
S614,
S617 – 621,
S625 – 634
S622 – 624
S635 – 638,
S641 – 647
53
KEY2
54
KEY3
55
ENC-VOLA
23
ENC-VOLB
24
ROTARY
ENCODER
S616
S616
MASTER
VOLUME
VOLUME
A
B
ENC-JOG1A (TUNER)
25
ENC-JOG1B (TUNER)
26
ROTARY
ENCODER
S615
S615
TUNING
– Cc +
A
B
ENC-JOG2A (EDIT)
27
ENC-JOG2B (EDIT)
28
ROTARY
ENCODER
S639
SIRCS
SPECTRUM ANALYZER
BAND-PASS FILTER
IC501
47
SPEANA 1
LINE
IN
IN
56
SPEANA 2
57
SPEANA 3
58
SPEANA 4
F01
SPEANA
FOUT
FOUT
F02
F03
F04
F04
125Hz
500Hz
2kHz
8kHz
59
17
4
16
15
14
REMOTE CONTROL
RECEIVER
IC602
D603 – 609
D611 – 630
LED DRIVER
IC603
LED DRIVER
IC605
D
ATA
CLK
STB
CLR
15 16 17 18
P1 – P5, P9 – P13
19, 20, 22 – 24, 1 – 5
P15 – P20
8 – 13
FL DRIVER
IC601
FLUORESCENT INDICATOR TUBE
FL601
DIG1
XOUT
XIN
SEG1 – SEG35
S
D
ATA
SCK
CS
RESET
16 15 14 13
12
20
21
OSC
INVERTER
Q604 – 613
LED DRIVE
Q601
RECT
D905 – 908
+5.7V
REGULATOR
IC901
GRID
DRIVE
Q600
C610, R624
59 – 33, 31 – 24
DIG2 – DIG15
11 – 1, 64 – 62
D641 – 660
D631 – 636, 661
D
ATA
CLK
STB
CLR
15 16 17 18
P1 – P6, P10
19, 20, 22 – 25, 2
P11 – P20
3 – 6, 8 – 13
INVERTER
Q621 – 630
VOLTAGE
DETECT
IC402
RESET
SWITCH
Q401
FL DRIVER
IC604
FLUORESCENT INDICATOR TUBE
FL602
XOUT
XIN
SEG1 – SEG35
S
D
ATA
SCK
CS
RESET
16 15 14 13
20
21
OSC
GRID
DRIVE
Q615 – 620
C665, R711
59 – 33, 31 – 24
DIG10 – DIG15
3 – 1, 64 – 62
DIG1 – DIG9
12 – 4
FL-DATA
FL-CLK
FL-CS1 (TUNER)
AC OFF MUTE
VF (CD, MD, EDIT)
VF (CD, MD, EDIT)
SUB AC
SUB AC
+7.5V
–7.5V
RY901
AC IN
T901
SUB POWER
TRANSFORMER
T902
MAIN POWER
TRANSFORMER
F2
F1
TO FL601
D910
D911
D909
Q403
66
67
62
63
FL-CS2 (EDIT)
76
FL-CLEAR
LED-DATA
LED-CLK
LED-CS1
79
80
81
82
LED-CS2
8
TIMER LED
LED DRIVE
Q602, 603
7
STANBY LED
46
83
LED-CLEAR
AC-CUT
99
VG POWER
92
MAIN TR-RELAY
43
RESET
S639
SELECTOR
– +
D602
I/u
D601
(TIMER)
t
Q402
D405
D402
D403, 404
D826
D824
D825
12
14
11
10
D833
D832
+5V
SYSTEM CONTROLLER (IC401),
FL DRIVER (IC601, 604) B+
D.VDD (+5V)
M62442FP (IC101) DIGITAL SECTION,
BA3833F (IC501) B+
RECT
D805, 806
+10V
REGULATOR
Q801, 802
ST +10V
(FM/AM TUNER UNIT B+)
RECT
D901, 902
RELAY DRIVE
Q904
VOLTAGE
SELECTOR
S901
FL POWER
SWITCH
Q905 – 907
NEGATIVE VOLTAGE
REGULATOR
Q902, 903
VG (TUNER)
(FL DRIVER (IC601) B–)
RECT
D842, 843
NEGATIVE VOLTAGE
REGULATOR
Q840, 841
VG (EDIT)
(FL DRIVER (IC604) B–)
RECT
D801 – 804
RECT
D821, 822
+7.5V
REGULATOR
Q811
+5V
(EXTERNAL CONTROL CIRCUIT B+)
+5.7V
REGULATOR
IC821
LED +5V
(LED DRIVER (IC603, 605) B+)
RECT
D831
D831
–7.5V
REGULATOR
Q861
M62442FP (IC101)
ANALOG SECTION
F1
F2
TO FL602
B+
B–
POWER AMP (IC301),
PROTECTOR (IC302)
CN105 (2/2)
(TO HMC-MD777)
SYSTEM CONTROL
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