Sony MDX-C7900 / MDX-C7900R Service Manual ▷ View online
– 23 –
– 24 –
MDX-C7900/C7900R
5-2.
BLOCK DIAGRAM – MAIN Section –
MUTING
Q991
B+ SWITCH
Q51
MUTING
CONTROL SWITCH
Q903
LOW-PASS
FILTER
IC203
35
36
37
L3 (MD-L)
L4 (AUX-L)
L2 (FM-L)
38
L1 (AM-L)
1
4
2 FM-ANT
AM-ANT
6
VCO
FM +B
AM +B
+B
21
FM-IF
11
AM-IF
5
8
10
9
9 16
11
13
6
1
5
20
4 2
9 10 11 85
18
VT
DOUT
DIN
CLK
XI
XO
CE
PLL SI
58 LOCK IN
PLL SO
PLL CKO
PLL CE
65
AF SEEK
82
53
S METER (VSM)
83
SD IN
81
ST IN/MONO
62
TU ATT
26
VOL SO
27
VOL CKO
41
VOL CE
31
DBMOD1
16
DBMOD2
59
EMPH O
52
MPDH (MTP)
FM OSC
15
AM OSC
SEEK
IF
PD
13
SEEK
70
RDS SI
71
RDS CKI
67
DAVN
19
S-METER
20
SD
22
18
16
16
12
ST/MONO
23
FM-DET
FM-L-CH
FM-R-CH
AM
DET
VOLUME
CONTROL
INPUT
SELECTOR
TONE
CONTROL
33
27
28
LVR
IN
IN
LS
IN
IN
LT
OUT
COMMAND
34
LSELO
22
23
LT
IN
IN
FL-IN
FRONT L (+)
FRONT L (–)
FRONT R (+)
FRONT R (–)
REAR L (+)
REAR L (–)
REAR R (+)
REAR R (–)
FL+
1
9
4
12
2
10
3
11
FL–
FR+
FR–
RL+
RL–
RR+
RR–
FR-IN
RL-IN
RR-IN
LS
OUT
FADER
CONTROL
CONTROL
SHIFT
REGISTER
& LATCH
DECODER
21
LF
OUT
20
17 16 18
LR
OUT
DI
CL
CE
MUTE
ST-BY
DATA
CLK
CE
DATA
CLK
CE
LOW-PASS
FILTER
Q4
AF SEEK
SWITCHING
Q5
X1
7.2MHz
FM/AM PLL
IC100
05
B
(Page 4)
(L)
(R)
R-CH
BCK, LRCK, FS256
BCK, LRCK
FS256
• SIGNAL PATH
: MD PLAY
: FM
: AM (MW)
NOISE
SHAPER
INPUT
INTERFACE
D/A
CONVERTER
MODE
CONTROL
CLK
CONTROL
DIGITAL FILTER,
D/A CONVERTER
IC202
12
9
12
5
3
11
VOUTL
VOUTR
R-CH
R-CH
14
R-CH
15
MUTING
Q101
MUTING
Q100
MUTING
CONTROL SWITCH
Q103
R-CH
60
AU ATT
55
AMP ATT
56
80
AMP ON
32 57
ILL IN
MUTING
Q302
MUTING
CONTROL SWITCH
Q700
R-CH
R-CH
POWER AMP
IC500
R-CH
MUTING
Q303
LEVEL
SHIFT
Q500
R-CH
MUTING
Q301
R-CH
MUTING
Q300
R-CH
R-CH
6
5
4
1
7
18
17
DATA
BCK
LRCK
ZERO
XTI
MUTE
DM2
OUTPUT
INTERFACE
CIRCUIT
DIGITAL
SIGNAL
PROCESSOR
INPUT
INTERFACE
CIRCUIT
LEVEL
SHIFT
IC204
IC204
SYSTEM
CLOCK
SELECTOR
& VCO
PHASE
COMPARATOR
COUNTER
SEQUENTIAL
CONTROL
MODE
CONTROL
DIGITAL D-BASS CONTROL
IC201
DIGITAL AUDIO PLL
IC200
10
9
11
DOUT
BCKO
LRCO
2
3
1
DI
5
3
1
1
BCK
LRCK
LRCK
6
4
2
2
BCKI
LRCI
LRCI
CLK
4
AMPI
PD
4
REF
1
C
(Page 4)
LOCK
A
(Page 4)
DADT
2
CKO
10
14
MOD1
15
MOD2
MODE1
EMPH
MODE2
MODE1
EMPH
MODE2
16
DB/DS
CNP300 (1/2)
J1
(FM/AM ANTENNA)
FM/AM TUNER UNIT
TU1
AM B+
D3
FM B+
BUS AUDIO IN
(L)
(R)
R-CH
CNP300 (2/2)
CNP500 (1/2)
FRONT
LINE OUT
REAR
LINE OUT
(L)
(R)
R-CH
RDS DECODER
IC102
MASTER CONTROLLER
IC700 (1/3)
ELECTRICAL VOLUME
IC300
INTERFACE
REGISTER
IIC BUS
SLAVE
TRANSCEIVER
OSCILLATOR
& CLOCK
X2
4.332MHz
4
8
5
OSCI
OSCO
10
9
14
SDA
VDDA
7
VDDD
SCL
DAVN
RDS SIGNAL
BUFFER
Q50
57 kHz
BAND-PASS
FILTER
CLOCKED
COMPARATOR
RDS/RDBS
DEMODULATOR
& DECODER
SIGNAL
QUALITY
DECODER
16
18
19
MPX
CIN
4
FM B+
BACKUP +5V
5
SC
OUT
MULTI
PATH
DETECTOR
20
2
LVIN
MPTH
RV1
RV1
SIGNAL
METER
IC103
LOW-PASS FILTER
SWITCHING
(C7900R)
(C7900R)
AM B+
+
LO/DX
LO/DX
DIGITAL
FILTER
SIGNAL
METER BUFFER
Q1
SEEKOUT
TEL ATT
TESTIN
21
23
9
7
17
19
4
22
TEL ATT
TEST
13
15
ILL IN
14
– 25 –
– 26 –
MDX-C7900/C7900R
5-3.
BLOCK DIAGRAM – DISPLAY/KEY CONTROL Section –
Q802
D811 – 817,
LSW802, 807, 812
LSW801, 804, 806,
LSW808, 809 – 811,
LSW813 – 821
05
37
REIN1
D-BASS IN
KEYACK
AMBER
79
NOSE SW
12
BEEP
15
LCDANG
40
2
DATA
18
CLK
17
21
20
STB
OSC OUT
OSC IN
19
50
KEY IN1
REIN0
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
BAND (9K
–
10K)
100
KEY ACTIVE
SWITCH
Q905
BUZZER
DRIVE
Q701
OSC
B+ SWITCH
Q806
D912
VOL+
VOL
–
D900
J900
(REMOTE IN)
Q801
VLC0 – VLC5
GREEN
POWER ON
1
DIMMER
3
4
LED DRIVE
Q803
CONTRAST
SWITCHING
Q901, 902
AD ON
D
(Page 10)
DIMMER
LSW801 – 804,
LSW806 – 821
ROTARY
ENCODER
EN801
BACKUP +5V
CNP801
FRONT PANEL SIDE
BZ1
(BUZZER)
CN900
MAIN BODY SIDE
LCD +10V
LCD +10V
BATT
12
12
(LSW813: AEP, UK model only)
(LSW813: AEP, UK model only)
LSW805
D-BASS
LED DRIVE
Q804
11 – 6
22 – 25
X700
3.68MHz
X701
32kHz
S701
(FREQUENCY SELECT)
MW 10K/FM 200K
(C7900: E model)
MW 9K/FM 50K
KEY IN1 – KEY IN4
R845
LIQUID CRYSTAL DISPLAY DRIVER
IC801
MASTER CONTROLLER
IC700 (2/3)
LCD801
LIQUID CRYSTAL DISPLAY
26 – 90
SEG1 – SEG65
100 – 93
COM0 – COM7
VOLUME/BASS/TREBLE/
BALANCE/FADER CONTROL
EN801
– 27 –
– 28 –
MDX-C7900/C7900R
5-4.
BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
BACKUP +5V
BACKUP +5V
RESET SIGNAL
GENERATOR
IC801
RAM RESET
IC802
BATTERY
DETECT
Q601
ACCESSORY
CHECK
Q900
LEVEL SHIFT
Q603
S900
(RESET)
6
8
4
CLK
AMT+B
FM8V
VCC
ANP+B
REGULATOR
IC800
COM8V
BU+B
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 (3/3)
MD MECHANISM CONTROLLER
IC501 (2/2)
BUS ON SWITCH
Q600
BATT
BATT B+
BUS ON
DATA
CLK
RESET
CNJ600
7
6
5
4
2
16
BATT
ANT REM
AMP REM
6
5
BUS CONTROL IN
(FOR SONY BUS)
CNP500 (2/2)
S700
(POWER SELECT)
REGULATOR
CONTROL SWITCH
Q255
REGULATOR
CONTROL SWITCH
Q253
REGULATOR
CONTROL SWITCH
Q906
B+ SWITCH
Q402, 403
DC/DC
CONVERTER
IC250
+12V
REGULATOR
Q254
+5V
REGULATOR
Q252
+10V
REGULATOR
Q903, 904
BACK LIGHT
LAMP DRIVE
Q805, 807
F1
Q251
+5V
REGULATOR
IC900
COM +8V
(ELECTRICAL VOLUME (IC300) B+)
05
RST
3
BATT
BATTERY
SWITCH
10
7
BU IN
UNISI
50 UNISO
UNICKI
MDMON 10
76
36
22 UNI CKO
20 UNI SI
21 UNI SO
RAMBU
29
102
90
65
MD-ON
D702
TH600
D604
D603
D913
+3.3V
REGULATOR
IC401, Q401
B+
SWITCH
Q250
VCC
LCD +10V
(LCD DRIVER (IC801) B+)
D/A +5V
PL801, 802
(FOR BACK LIGHT)
AM B+
(AM CIRCUIT B+)
FM B+
(FM CIRCUIT B+)
7
ACC
+9V
REGULATOR
Q2
+9V
(FOR VT)
+5V
REGULATOR
Q6
+5V
(FM/AM PLL (IC100) B+)
BATT
(POWER AMP (IC500) B+)
+3.3V
DRIVER +5V
LOAD +12V
D803
D701
BACKUP +5V
PULLUP +5V
(Type A)
(Type B)
2
3
4
5
9
10
11
8
6
PW ON 109
PW SEL
ON
OFF
FM ON 110
TUN ON
LAMP ON (ILL ON)
111
64
108
RESET
SYSRET
BU-IN
BUS-ON
RESET
LINKOFF
ACC IN
BU IN
BUS-ON
48
61
60
30
49
46
95
D
(Page 8)
DIMMER
MOTOR/COIL DRIVER
(IC303) B+
LOADING MOTOR
DRIVER (IC305) B+
– 29 –
– 30 –
MDX-C7900/C7900R
5-5.
PRINTED WIRING BOARDS – MECHANISM DECK Section –
• 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
Note on Printed Wiring Boards:
•
z
: Through hole.
•
f
: 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.
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