Sony MDX-C8970R Service Manual ▷ View online
MDX-C8970R
25
25
5-5.
BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
BACKUP +5V
RESET SIGNAL
GENERATOR
IC506
REMOTE CONTROL
RECEIVER
IC910
SIRCS
BUFFER
Q275
BATTERY
DETECT
Q271
ACCESSORY CHECK
Q441
LEVEL SHIFT
Q273
S703
6
8
4
CLK
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
IC271
MASTER CONTROLLER
IC500 (4/4)
MD MECHANISM CONTROLLER
IC501 (2/2)
BUS ON SWITCH
Q272
BATT
BATT B+
BUS ON
DATA
CLK
RESET
7
6
5
4
2
SIRCS
3
16
BATT
CN271
BUS CONTROL IN
(FOR SONY BUS)
CNP401 (2/2)
(POWER CONNECTOR)
ILLUMINATION
LINE DETECT
Q431
POWER
CONTROL SWITCH
Q882
REGULATOR
CONTROL SWITCH
Q423, 424
F1
05
RST
3
BATT
BATTERY
SWITCH
10
BU IN
UNISI
50 UNISO
UNICKIO
MDMON 10
77
7
22 UNICKO
20 UNISI
21 UNISO
86 HSTX
6
24 SIRCS
90
65
MD-ON
D204
TH271
D276
D275
D442
D431
VCC
7
ACC
14
ILL
+5V
REGULATOR
Q421, 422
+3.3V REGULATOR
IC404
+3.3V REGULATOR
IC401, Q401
SWITCHING
REGULATOR
Q883
SWITCHING
REGULATOR
Q884
+3.3V
REGULATOR
IC401, Q401
B+ SWITCH
Q801, 802
B+ SWITCH
Q881
B+ CHECK
IC421
B+ SWITCH
Q402, 403
B+ SWITCH
Q886,887
OSC SWITCH
Q890
+3.3V
D424
BACKUP +5V
DIG +3.3V
ANA +3.3V
DSP +5V
+5V
(CSV CIRCUIT B+)
(DSP CIRCUIT B+)
PULL UP +5V
FM-ON
TU-ON
FM-ON
TU-ON
POW-ON
BUS-ON
POW-ON
ILL-ON
61
SHIFT OUT 72
PWM IN 65
CSV ON 16
B+ SWITCH
Q402, 403
DSP ON 96
114
84
RESET
SYSRST
BU-IN
BUS-ON
RESET
LINKOFF
BU-IN
BUS-ON
ACC IN
85
ILL IN
ACC IN
ILL IN
48
61
60
30
49
46
LEVEL SHIFT
Q274
LIQUID CRYSTAL DISPLAY
DRIVE CONTROLLER
IC701 (2/2)
UNISI
97 UNISO
UNICKI
52
ILL-ON
BU-IN
BUS-ON
RESET
101
38
49
NMI (H)
82
81
98
G
(Page 23)
H
(Page 23)
RESET
DRIVER +5V
MOTOR/COIL DRIVER
(IC303) B+
LOAD +12V
LOADING MOTOR
DRIVER (IC305) B+
BATT B+
POWER AMP
(IC481) B+
RESET
D422
D403
TH461
TH462
OUT2
IN1
OUT1
POWER CONTROL
IC871
RT
IN2
VCC
9
ERROR
AMP
2
14
3
7
10
PWN
COMPARATOR
OUTPUT
CIRCUIT
CIRCUIT
ERROR
AMP
OSC
PWN
COMPARATOR
OUTPUT
CIRCUIT
CIRCUIT
Q183
LEVEL SHIFT
IC702
Q181
TU +5V
(TUNER CIRCUIT B+)
FM +8V
(FM CIRCUIT B+)
AM +8V
(AM CIRCUIT B+)
TU +8V
(TUNER CIRCUIT B+)
+8V
REGULATOR
IC403
+5V
REGULATOR
Q185
B+ SWITCH
Q901
B+ SWITCH
Q182
B+ SWITCH
Q180
+5V
(RDS DECODER (IC901) B+)
+5V
(MIC AMP CIRCUIT B+)
AUDIO +8.5V
(AUDIO CIRCUIT B+)
+8.5V
REGULATOR
IC402
+5V
REGULATOR
Q841
BUS-ON
TU-ON
B+ SWITCH
Q253, 256
LCD +10V
LCD DRIVER (IC900, 920)/
ILLUMINATION LED B+
ANT REM
AMP REM
6
5
AMP REMOTE
SWITCH
Q461(1/2), 462(1/2)
ANTENNA REMOTE
SWITCH
Q461(2/2), 462(2/2)
POW-ON
26
26
• Circuit Boards Location
DISPLAY board
RELAY board
MAIN board
SENSOR board
SERVO board
POWER board
5-6.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
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.
Note on Printed Wiring Boards:
• 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.)
•
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
: MW/LW
E
: MD
• Abbreviation
TYPE A
: ENGLISH, SPANISH
TYPE B
: ENGLISH, GERMAN
TYPE C
: ENGLISH, FRENCH
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
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.
MDX-C8970R
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27
5-7.
PRINTED WIRING BOARD – SERVO/SENSOR Boards –
•
See page 26 for Circuit Boards Location.
• Semiconductor
Location
Ref. No.
Location
D401
E-6
D501
E-5
IC301
B-5
IC302
D-2
IC303
B-3
IC304
C-5
IC305
F-8
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
E-6
Q402
E-8
Q403
E-8
(Page 30)
MDX-C8970R
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28
5-8.
SCHEMATIC DIAGRAM – SERVO (1/2)/SENSOR Boards –
•
See page 37 for Waveforms.
•
See page 44 for IC Block Diagrams.
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to
• Voltages and waveforms are dc with respect to
ground in playback mode.
no mark : MD
no mark : MD
∗
: Impossible to measure
The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
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