Sony MDX-C7970 / MDX-C7970R / MDX-C8970 Service Manual ▷ View online
MDX-C7970/C7970R
– 29 –
– 30 –
4-4.
BLOCK DIAGRAM – DISPLAY/KEY CONTROL Section –
LED501 – 505,
LSW532, 536
LSW512 – 521, 531,
LSW533 – 535, 537, 538
LED510, 511
(LCD BACK LIGHT)
05
37
RE-IN1
D-BASS IN
KEYACK
79
DOOR-SW
12
BEEP
15
LCDANG
40
LCD-DATA
18
LCD-CLK
17
21
20
LCD-CE
OSC OUT
OSC IN
19
50
KEY-IN1
RE-IN0
106 107
KEY-IN0
X1
X0
X1A
X0A
RC-IN0
RC-IN1
46
47
49 72
93
92
73
LCD SO
13
LCD CKO
14
LCD CE
104
74
KEY ACTIVE
SWITCH
Q905
BUZZER
DRIVE
Q701
OSC
REGULATOR
Q507
LED DRIVE
Q503, 505
LED DRIVE
Q504, 506
D912
VOL+
VOL–
D900
VLC0 – VLC5
REGULATOR
Q501, 502
POWER-ON
3
4
GREEN
1
AMBER
2
CONTRAST
SWITCHING
Q901
AD-ON
LSW512 – 521,
LSW531 – 538,
LSW531 – 538,
LSW890, S502
ROTARY
ENCODER
RE501
BACKUP +5V
CNP501
FRONT PANEL SIDE
BZ1
(BUZZER)
CN901
MAIN BODY SIDE
LCD +10V
LCD +10V
1
2
(LSW533: MDX-C7970R only)
(LSW533: MDX-C7970R only)
S501
D-BASS
11 – 6
X700
3.68MHz
X701
32.768kHz
R561
LIQUID CRYSTAL DISPLAY DRIVER
IC501
MASTER CONTROLLER
IC700 (3/4)
LCD501
LIQUID CRYSTAL DISPLAY
SEG1 – SEG65
100 – 93
26 – 90
COM0 – COM7
VOLUME/BASS/TREBLE/
BALANCE/FADER CONTROL
RE501
J900
REMOTE IN
17
NOSE-SW
S901
(NOSE DETECT)
DIM-ON
MDX-C7970/C7970R
– 31 –
4-5.
BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
– 32 –
BACKUP +5V
BACKUP +5V
RESET SIGNAL
GENERATOR
IC801
SIRCS BUFFER
Q602
REMOTE CONTROL
RECEIVER
IC502
RAM RESET
IC802
BATTERY
DETECT
Q601
ACCESSORY CHECK
Q900
LEVEL SHIFT
Q603
6
8
4
CLK
ANT+B
FM8V
AMP+B
REGULATOR
IC800
COM8V
AM8V
MODE1
MODE2
STB
CLK IN
DATA OUT
DATA
2
RST
RESET
SWITCH
BUS ON
SWITCH
13
11
1
BUS ON
OUT
OUT
BUS
ON IN
12
9
DATA IN
SONY BUS INTERFACE
IC600
MASTER CONTROLLER
IC700 (4/4)
MD MECHANISM CONTROLLER
IC501 (2/2)
BUS ON SWITCH
Q600
BATT
BATT B+
BUS ON
DATA
CLK
RESET
7
6
5
4
2
SIRCS
3
16
BATT
ANT REM
AMP REM
6
5
CNJ600
BUS CONTROL IN
(FOR SONY BUS)
CNP500 (2/2)
(POWER CONNECTOR)
REGULATOR
CONTROL SWITCH
Q906
F1
COM +8V
(AUDIO CIRCUIT B+)
05
RST
3
BATT
BATTERY
SWITCH
10
BU IN
UNISI
50 UNISO
UNICKIO
MDMON 10
76
36
22 UNI CKIO
20 UNI SI
21 UNI SO
86 HSTX
29
24 SIRCS
90
65
MD-ON
D702
D916
D605
TH600
D604
D603
D606
D913
D500
LED891,
LSW890
LSW890
LED891
(MD DISC SLOT)
VCC
AM B+
(AM CIRCUIT B+)
FM B+
(FM CIRCUIT B+)
VCC
7
7
ACC
14
ILL IN
+5V
REGULATOR
Q6
+10V
REGULATOR
Q903, 904
+12V
REGULATOR
Q254
+3.3V
REGULATOR
IC401, Q401
DC/DC
CONVERTER
IC250
+5V
(TUNER CIRCUIT B+)
TUNER B+
B+ SWITCH
Q402, 403
B+ SWITCH
Q250, 251
+3.3V
D3
D803
D804
BACKUP +5V
2
3
4
9
BU+B
5
10
11
8
6
FM-ON
TU-ON
LAMP ON (ILL ON)
64
108
110
PW-ON 109
111
RESET
SYSRST
RAMBU
BU-IN
BUS-ON
RESET
LINKOFF
BU-IN
BUS-ON
ACC IN
57
ILL IN
25
PACK-IND
48
61
60
30
49
46
102
J
(Page 28)
MUTE
H
(Page 28)
AMP ON
I
(Page 28)
STB
DRIVER +5V
MOTOR/COIL DRIVER
(IC303) B+
LOAD +12V
LOADING MOTOR
DRIVER (IC305) B+
REGULATOR
CONTROL SWITCH
Q907
REGULATOR
Q908
LCD +10V
LCD DRIVER (IC501)/
ILLUMINATION LED B+
REGULATOR
CONTROL SWITCH
Q255
BATT B+
POWER AMP
(IC500) B+
S900
(RESET)
D802
D607
LSW890
6
– 33 –
4-6.
NOTES FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM (MW/LW)
L
: BUS AUDIO IN
E
: MD PLAY
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
r
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
– 34 –
• Circuit Boards Location
SUB board
SENSOR board
DISPLAY board
MAIN board
SERVO board
MDX-C7970/C7970R
– 35 –
– 36 –
4-7.
PRINTED WIRING BOARDS – SERVO Section –
•
See page 34 for Circuit Boards Location.
• Semiconductor
Location
Ref. No.
Location
D401
E-6
D501
E-4
IC301
B-5
IC302
C-2
IC303
B-3
IC304
C-5
IC305
F-6
IC306
B-4
IC307
B-8
IC401
E-6
IC501
F-3
IC502
D-5
IC503
D-4
Q301
A-4
Q302
C-1
Q401
D-6
Q402
E-7
Q403
E-7
(Page 46)
Click on the first or last page to see other MDX-C7970 / MDX-C7970R / MDX-C8970 service manuals if exist.