Sony MDX-C8900 Service Manual ▷ View online
– 33 –
– 34 –
MDX-C8900
4-4.
BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
BACKUP +5V
BACKUP +5V
+8V
RESET SIGNAL
GENERATOR
IC505
REMOTE CONTROL
RECEIVER
IC901
SIRCS
BUFFER
Q522
RAM RESET
IC503
BATTERY
DETECT
Q516
ACCESSORY CHECK
Q517
LEVEL SHIFT
Q521
SW701
(RESET)
6
8
4
CLK
ANT+B
FM8V
AMP+B
REGULATOR
IC506
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
IC504
MASTER CONTROLLER
IC500 (3/3)
MD MECHANISM CONTROLLER
IC501 (2/2)
BUS ON SWITCH
Q520
BATT
BATT B+
BUS ON
DATA
CLK
RESET
7
6
5
4
2
SIRCS
3
16
BATT
ANT REM
AMP REM
6
5
CN501
BUS CONTROL IN
(FOR SONY BUS)
CNP500 (2/2)
(POWER CONNECTOR)
SW500
(POWER SELECT)
ILLUMINATION
LINE DETECT
Q515
DIMMER
CONTROL SWITCH
Q511, 512, 514
REGULATOR
CONTROL SWITCH
Q505
OSC OFF
SWITCH
Q527
F1
Q101
COM +8V
(AUDIO CIRCUIT B+)
05
RST
3
BATT
BATTERY
SWITCH
10
BU IN
UNISI
50 UNISO
UNICKI
MDMON 10
77
10
19 UNICKIO
17 UNISI
18 UNISO
86 HSTX
11
24 SIRCS
90
65
MD-ON
D502
PS500
D538
D524
D526
D523
VCC
EL900
(FOR BACK LIGHT)
T501
INVERTER
AM B+
(AM CIRCUIT B+)
FM B+
(FM CIRCUIT B+)
VCC
7
7
ACC
14
ILL
+9V
REGULATOR
Q3
+9V
(FOR VT)
+5V
REGULATOR
Q2
+5.6V
REGULATOR
Q524, 525
+10V
REGULATOR
Q506
+8V
REGULATOR
Q405
+10V
REGULATOR
Q502
+12V
REGULATOR
Q102
+3.3V
REGULATOR
IC401, Q401
DC/DC
CONVERTER
IC101
OSC
Q510
+5V
(FM/AM PLL (IC4) B+)
TUNER B+
BATT B+
(POWER AMP (IC600) B+)
B+ SWITCH
Q1
B+ SWITCH
Q518, 519
B+ SWITCH
Q507, 508
B+ SWITCH
Q402, 403
B+ SWITCH
Q100
REGULATOR
IC501, Q513
+3.3V
D6
D527, 529
BACKUP +5V
2
3
4
9
10
11
8
6
POWON 120
POWSEL
FM-ON
TU-ON
ILL-ON
81
29
DIMMER 30
DOOR-IND 59
6
7
7
RESET
SYSRST
RAMBU
BU-IN
BUS-ON
RESET
LINKOFF
BU-IN
BUS-ON
ACC IN
78
ILLIN
48
61
60
30
49
46
B (ON)
A (OFF)
56
55
D
(Page 30)
E
(Page 32)
LED-ON
DOOR SW
DRIVER +5V
MOTOR/COIL DRIVER
(IC303) B+
LOAD +12V
LOADING MOTOR
DRIVER (IC305) B+
LCD +10V
LCD DRIVER (IC900)/
ILLUMINATION LED B+
P-ON +10V
(ILLUMINATION LED B+)
LED702, 703
(FOR ILLUMINATION)
REGULATOR
CONTROL SWITCH
Q501
REGULATOR
CONTROL SWITCH
Q404
REGULATOR
CONTROL SWITCH
Q103
SUB RELAY board
SENSOR board
AUDIO board
KEY board
MAIN board
SERVO board
4-5.
NOTE 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.
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.
• 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
E
: MD
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
• Circuit Boards Location
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.
– 35 –
– 36 –
– 37 –
– 38 –
MDX-C8900
4-6.
PRINTED WIRING BOARDS – MD SERVO Section –
•
See page 35 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 47)
– 39 –
– 40 –
MDX-C8900
4-7.
SCHEMATIC DIAGRAM – MD SERVO Section (1/3) –
•
See page 68 to 70 for IC Block Diagrams.
•
See page 66 for Waveforms.
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
• Voltages and waveforms are dc with respect to
ground in playback mode.
no mark : MD
no mark : MD
∗
: Impossible to measure
(Page 41)
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