Sony MDX-C7970 / MDX-C7970R / MDX-C8970 Service Manual ▷ View online
– 21 –
– 22 –
MW Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
n
[MODE]
button : AM (MDX-C7970)
MW (MDX-C7970R)
FREQUENCY SELECT switch : AM 10 k (E model)
Procedure:
1. Set to the test mode. (See page 18)
2. Push the
1. Set to the test mode. (See page 18)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to AM or MW.
Display
4. Adjust with the volume RV1 on TU1 so that the “AM” or “MW”
indication turns to “AM0” or “MW0” indication on the dis-
play window.
But, in case of alredy indicated “AM0” or “MW0”, turn the
RV1 so that put out light “0” indication and adjustment.
play window.
But, in case of alredy indicated “AM0” or “MW0”, turn the
RV1 so that put out light “0” indication and adjustment.
Display
*2: MDX-C7970R indicates “MW”.
*3: MDX-C7970R indicates “999”.
*4: Only MDX-C7970R indicates.
*3: MDX-C7970R indicates “999”.
*4: Only MDX-C7970R indicates.
Adjustment Location: See page 22.
AM RF signal
generator
Carrier frequency : 1000 kHz (MDX-C7970)
999 kHz (MDX-C7970R)
30% amplitude
modulation by
1 kHz signal
Output level
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna jack (J1)
SHUF
TP
*3
*2
*4
SHUF
TP
*3
*2
*4
Adjustment Location:
– SET UPPER VIEW –
RV1 RDS S-Meter Adjustment (MDX-C7970R)
TU1
RV1 AM (MW) Auto Scan/Stop Level Adjustment
RV2 FM Auto Scan/Stop Level Adjustment
FM Stereo Separation Adjustment (MDX-C7970)
FM Stereo Separation Adjustment (Narrow) (MDX-C7970R)
FM Stereo Separation Adjustment (Narrow) (MDX-C7970R)
RV3 FM Stereo Separation Adjustment (Wide) (MDX-C7970R)
RV4
MDX-C7970/C7970R
– 23 –
– 24 –
SECTION 4
DIAGRAMS
4-1.
BLOCK DIAGRAM – SERVO Section –
F
C
B
D
A
E
I
J
J
I
B
A
C
D
D
E
F
DETECTOR
1
2
J
I
4
5
6
7
A
B
C
D
D
8
9
E
F
LD
PD
LASER DIODE
ILCC
PD
OPTICAL PICK-UP
(KMS-241B/J1NP)
(KMS-241B/J1NP)
AUTOMATIC
POWER
CONTROL
Q302
11
10
APC
PD
LD/PD
AMP
12
APCREF
I-V
AMP
I-V
AMP
AT
AMP
B.P.F.
29
30
WBL
ADFM
ADIN
32
ADFG
ABCD
AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
35
34
26
28
ABCD
FE
TE
SE
V-I
CONVERTER
20
F0CNT
WBL
3T
EQ
+3.3V
SERIAL/
PARALLEL
CONVERTER,
DECODER
COMMAND
17
16
18
SWDT
SCLK
XLAT
RF AMP
B.P.F.
46
RFO
40
RF AGC
& EQ
AGCI
EQ
38
RF
RF AMP,
FOCUS/TRACKING ERROR AMP
IC302
TEMP
48 47
MORFO
MORFI
3T
PEAK &
BOTTOM
WBL
33
AUX
73 62
37
PEAK
36
BOTM
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC303
6
8
OUT4F
OUT4R
M
M901
(SPINDLE)
27
25
OUT2F
OUT2R
M
M902
(SLED)
21
23
OUT1F
OUT1R
12
10
OUT3F
OUT3R
FCS+
FCS–
TRK+
TRK–
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
3
4
IN4R
IN4F
29
30
IN2F
IN2R
19
18
IN1F
IN1R
14
15
IN3F
IN3R
SPFD
SPRD
IC306
92
91
88
89
86
85
83
APCREF
SFDR
SRDR
FFDR
FRDR
TFDR
TRDR
16
PSB
PWM GENERATOR
AUTOMATIC
POWER
CONTROL
DIGITAL
SERVO
SIGNAL
PROCESS
74
65
64
75
66
63
ANALOG MUX
A/D CONVERTER
AUTO
SEQUENCER
13
FROM CPU
INTERFACE
DIGITAL SERVO
SIGNAL PROCESSOR
IC301 (2/2)
RECP
PEAK HOLD
Q301
+3.3V
ABCD
AUX1
AUX2
ABCD
FE
TE
SE
PEAK
BOTM
81
80
82
XLRF
CKRF
DTRF
EFM/ACIRC
ENCODER/DECODER
SHOCK PROOF
MEMORY CONTROLLER
ATRAC
ENCODER/DECODER
PLL
FILTER
59
58
61
60
FILI
PCO
CLTV
FILO
100
EFMO
23
ADDT
IC301 (1/2)
15
TX
COMPA-
RATOR
51
52
55
ASYO
ASYI
RFI
ADIP
DEMODULATOR/
DECODER
78
ADFG
SPINDLE
SERVO
79
F0CNT
94 93
SPFD
SPRD
SUBCODE
PROCESSOR
24
SAMPLING
RATE
CONVERTER
DIGITAL
AUDIO
INTERFACE
22
21
DIN
DOUT
DIGITAL SIGNAL PROCESSOR,
EFM/ACIRC ENCODER/DECODER,
SHOCK PROOF MEMORY CONTROLLER,
ATRAC ENCODER/DECODER, 2M BIT D-RAM
IC301 (1/2)
DADT
INTERNAL BUS
D-RAM
CLOCK
GENERATOR
25
26
27
512FS OSC
IC304
XBCK
LRCK
FS256
BCK
LRCK
FS256
X301
22.5792MHz
22.5792MHz
16
OSCI
17
OSCO
CPU
INTERFACE
MONITOR
CONTROL
CONTROL
10
XRST
12
DQSY
11
SQSY
14
XINT
9 8
5 6 7
SENS
SRDT
SWDT
SCLK
XLAT
LEVEL SHIFT
IC502
5
13
3 1
6
12
4 2
LEVEL SHIFT
IC503
1
2
3
4
MNT0
MNT1
MNT2
MNT3
13
1
3
5
12
2
4
6
FOK
SHOCK
XBUSY
SLOCK
SWDT
SCLK
XLAT
59
62
55
54 52
45 51 64
26 27 28 29
MNT0
MNT1
MNT2
MNT3
67
A-MUTE
21
LOCK
39
TEMP
MD-RST
SQSY
CC-XINT
SENS
MD-SI
MD-SO
MD-CKO
MD-LAT
7
6
EJECT
LOAD
5
4
05
1
7
M
RIN
FIN
OUT1 OUT2
LOADING
MOTOR DRIVE
IC305
M903
(LOADING)
63
C-SW
LOADING START/
EJECT END
EJECT END
E-SW
LIMIT-IN
(LIMIT)
LOADING
END
END
ON: When the disc loading start
and the disc eject completion.
ON: When completion of
the disc loading.
ON: When the optical pick-up is
inner position.
31
32
EXTAL
XTAL
X501
10MHz
TH501
66
DEEMP
47, 46, 48, 49
1, 2, 24, 25
D0 – D3
32 – 29, 34 – 38, 43
9 – 12, 14 – 18, 5
A0 – A9
D0 – D3
A00 – A09
41
22
45
3
44
4
42
23
XOE
XWE
XRAS
XCAS
OE
WE
RAS
CAS
D-RAM
IC307
(Page 27)
A
DADT, BCK, LRCK, FS256
(Page 27)
C
LOCK
MD-ATT
(Page 27)
D
(Page 27)
B
EMPHASIS
MD MECHANISM CONTROLLER
IC501 (1/2)
• SIGNAL PATH
: MD PLAY
11
56
RESET, EMPHASIS
RESET
MDX-C7970/C7970R
– 25 –
– 26 –
4-2.
BLOCK DIAGRAM – TUNER Section –
1
4
2
FM-ANT
AM-ANT
6
VCO
21
FM/AM-IF
20
SD
5
5
28
3
24
10
16
9
13 12
69
100
15
68
VT
13
AM OSC
24
DATA
CLOCK
SSTOP
SDA
OSCOUT
OSCIN
SCL
SSTOP
BAND (9K-10K)
WIDE
53
S-METER (VSM)
SD-IN
83
ST-MONO
62
TU-ATT
LP AM
2
LP HC
1
LP FM
LP OUT
FM IN
25
AM IN
IF FM
14
IF AM
NARROW
51
QUALITY
35
NS-MASK
14
VDDA
7
VDDD
81
19
S-METER
15
S-METER (RDS)
18
16
12
FM-LCH
FM-RCH
(C7970R)
(C7970R)
AM-DET
23
FM-DET
FILTER
AM OSC
BUFFER
Q4
X1
10.25MHz
FM/AM PLL
IC100
05
• SIGNAL PATH
: FM
: AM (MW/LW)
MUTING
Q101
BUFFER
Q50
MUTING
CONTROL SWITCH
Q103
BAND-PASS
FILTER
IC101
R-CH
R-CH
D5
FM/AM TUNER UNIT
TU1
MASTER CONTROLLER
IC700 (1/4)
LO/DX
11
SEEK
13
SEEK
22
ST/MONO
SEEK
FM/AM SIGNAL
METER BUFFER
Q1
B+ SWITCH
Q51
J1
(FM/AM ANTENNA)
8
FM +B
FM B+
FM B+
10
AM +B
AM B+
TUNER B+
BACKUP +5V
9
+B
WIDE/NARROW
SWITCH
Q7
66
82
Q8
WIDE/
NARROW
SWITCH
WIDE/NARROW
52
MPDH (MTP)
67
DAVN
RDS DECODER
IC102
INTERFACE
REGISTER
IIC BUS
SLAVE
TRANSCEIVER
OSCILLATOR
& CLOCK
X2
4.332MHz
4
8
5
OSCI
OSCO
10
9
SDA
SCL
DAVN
57 kHz
BAND-PASS
FILTER
CLOCKED
COMPARATOR
RDS/RDBS
DEMODULATOR
& DECODER
SIGNAL
QUALITY
DECODER
16
18
19
MPX
CIN
4
5
SC
OUT
MULTI
PATH
DETECTOR
20
2
LVIN
MPTH
Q5
NOISE DET
DISCHARGE
SWITCH
FM RDS
S-METER
RV1
(C7970: E model)
(C7970R)
(C7970)
(C7970)
(C7970R)
(C7970)
(C7970)
(C7970)
(C7970R)
21
FM-IF
(C7970R)
11
AM-IF
(C7970R)
DATA
CLOCK
DATA, CLOCK
(Page 27)
G
FM
(Page 27)
E
AM
(Page 27)
F
S701
MW 10K/FM 200K
MW 9K/FM 50K
FREQUENCY SELECT
SEEKOUT
MDX-C7970/C7970R
– 27 –
– 28 –
4-3.
BLOCK DIAGRAM – MAIN Section –
LOCK IN
61
AF ATT
71
SCL
70
SDA
55
AMP ATT
80
58
TEL-ATT
32
60
AU ATT
05
• SIGNAL PATH
: MD PLAY
: FM
: AM (MW/LW)
: BUS AUDIO IN
STB
I
(Page 32)
AMP ON
H
(Page 31)
MASTER CONTROLLER
IC700 (2/4)
NOISE
SHAPER
INPUT
INTERFACE
D/A
CONVERTER
MODE
CONTROL
CLK
CONTROL
DIGITAL FILTER,
D/A CONVERTER
IC101
12
9
VOUTL
VOUTR
R-CH
BATTERY OFF
MUTE DRIVER
Q704
MUTING
CONTROL SWITCH
Q702 (2/2)
MUTING
CONTROL SWITCH
Q703
56
AMP ON
MUTE
J
(Page 31)
MD-ATT
D
(Page 24)
6
5
4
1
15
17 16
DATA
BCK
LRCK
XTI
RSTB
DM1
DM0
BCK
DADT
LRCK
FS256
A
(Page 24)
DADT,
BCK,
LRCK,
FS256
BCK,
LRCK,
FS256
B
(Page 24)
E
(Page 26)
F
(Page 26)
EMPHASIS
DIGITAL
FILTER
RESET,
EMPHASIS
EMPHASIS
FM
AM
G
(Page 26)
DATA, CLOCK
C
(Page 24)
LOCK
RESET
COM +8V
BATT B+
D703
Q702 (1/2)
D700
D511
D701
CNP300 (2/2)
FRONT
LINE OUT
(L)
(R)
REAR
LINE OUT
(L)
(R)
MUTING
Q301
MUTING
Q401
MUTING
Q300
MUTING
Q400
FRONT L (+)
1
12
14
5
3
FL+
FL–
21
23
FR+
FR–
FL-IN
FR-IN
11
9
7
RL+
RL–
RL-IN
15
22
17
19
RR+
RR–
RR-IN
4
LEVEL SHIFT
Q500
CNP500 (1/2)
(POWER CONNECTOR)
POWER AMP
IC500
FRONT L (–)
9
FRONT R (+)
4
FRONT R (–)
12
REAR L (+)
2
REAR L (–)
10
REAR R (+)
3
REAR R (–)
11
TEST MODE
15
13
MUTING
Q302
MUTING
Q403
MUTING
Q303
MUTING
Q402
PDL
SE2L
SE1L
SE3L
SDA
SCL
DATA
CLOCK
MUTE
12
11
1
28
VOLUME
CONTROL
CIRCUIT
LOUDNESS
CONTROL
CIRCUIT
DIGITAL CONTROL
CIRCUIT
IIC BUS
LOUDNESS
CONTROL
CIRCUIT
INPUT
SELECTOR
(L)
(R)
R-CH
R-CH
INPUT SELECT,
ELECTRICAL VOLUME
IC300
CNP300 (1/2)
BUS
AUDIO IN
TESTIN
SOFT
MUTE
TONE
CONTROL
CIRCUIT
FADER
FADER
20
26
25 24
OUT RL
22
OUT FL
R-CH
R-CH
R-CH
R-CH
MUTE
ST-BY
TEL-ATT
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