Sony MDX-C7890R Service Manual ▷ View online
– 13 –
MOTOR ASS’Y (M901, M902, M903), SENSOR BOARD
1
Remove the solders
of motor (M901, M902, M903).
of motor (M901, M902, M903).
3
sensor board
2
two screws
(2
(2
×
8)
8
base (SL)
7
screw
(B2
(B2
×
3)
6
motor ass’y
(M902)
(M902)
5
bracket (SL)
4
screw
(P1.7
(P1.7
×
1.8)
!¡
screw
(P2
(P2
×
2.2)
!™
motor ass’y
(M903)
(M903)
0
motor ass’y
(M901)
(M901)
9
two screws
(P1.7
(P1.7
×
1.8)
– 14 –
SECTION 4
ELECTRICAL ADJUSTMENTS
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “power select” switch (S700) is “A (ON) ” position.
2. Turn ON the regulated power supply. (All LEDs on the set
1. Set the “power select” switch (S700) is “A (ON) ” position.
2. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
Note:
Press the
[OFF]
button, if the clock is not displayed.
3. Push the preset
[4]
button.
4. Push the preset
[5]
button.
5. Press the preset
[1]
button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the
1. Push the
[OFF]
button.
2. Return the “power select” switch (S700) to initially set posi-
tion.
MD section adjustments are done automatically in this set.
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
cause its internal block is difficult to repair.
Note:
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment.
2. FM Stereo Separation Adjustment.
3. MW Auto Scan/stop Level Adjustment.
4. RDS S-Meter Adjustment.
1. FM Auto Scan/Stop Level Adjustment.
2. FM Stereo Separation Adjustment.
3. MW Auto Scan/stop Level Adjustment.
4. RDS S-Meter Adjustment.
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
MD SECTION
See the adjustment location from on page 16 for the ad-
justment.
justment.
TUNER SECTION
0 dB=1 µV
Carrier frequency : 98.0 MHz
Output level
Output level
: 22 dB (12.6
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
FM RF signal
generator
0.01
µ
F
set
antenna jack (J1)
Procedure:
1. Set to the test mode.
2. Push the
1. Set to the test mode.
2. Push the
[SOURCE]
button and set to FM.
Display
3. Adjust with the volume RV2 on TU1 so that the “FM” indica-
tion turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 16.
FM Stereo Separation Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV4 on TU1
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 16.
SHUF
REG
SHUF
REG
Carrier frequency : 98.0 MHz
Output level
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 33.75 kHz deviation (45%)
sub: 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot: 7.5 kHz deviation (10%)
19 kHz pilot: 7.5 kHz deviation (10%)
FM RF signal
generator
0.01
µ
F
set
antenna jack (J1)
+
–
–
speaker out terminal
level meter
4
Ω
– 15 –
– 16 –
MW Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: MW
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the
1. Set to the test mode. (See page 14.)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to MW .
Display
4. Adjust with the volume RV1 on TU1 so that the “MW” indi-
cation turns to “MW0” indication on the display window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 16.
AM RF signal
generator
set
AM dummy antenna
(50
(50
Ω
)
30
Ω
15 pF
65 pF
antenna jack (J1)
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level
30% amplitude
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
SHUF
REG
TP
SHUF
REG
TP
RDS S-Meter Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the
1. Set to the test mode. (See page 14.)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Push the preset
[10]
button.
4. Adjust RV1 on MAIN board so that the display indication is
“15.8”.
Display
Specification: Display indication : 15.6 to 16.4
Adjustment Location: See page 16.
Carrier frequency : 98.0 MHz
Output level
Output level
: 35 dB (56.2
µ
V)
Mode
: mono
Modulation
: no modulation
FM RF signal
generator
0.01
µ
F
set
antenna jack (J1)
SHUF
REG
SHUF
REG
Adjustment Location:
RV1 RDS S-METER Adjustment
– SET UPPER VIEW –
TU1
RV2 FM AUTO SCAN/STOP LEVEL Adjustment
RV1 MW AUTO SCAN/STOP LEVEL Adjustment
RV4 FM STEREO SEPARATION Adjustment
– 35 –
• IC Block Diagrams
– SERVO Board –
– SERVO Board –
IC301
CXD2652AR
100 99 98 97 96 95
94 93
EFMO
DVSS
TEST3
TEST2
TEST1
FGIN
SPFD
SPRD
92
SFDR
91
SRDR
90
FS4
89
FRDR
88
FFDR
87
DVDD
86
TFDR
85
TRDR
84
LDDR
83
APCREF
82
DTRF
81
CKRF
80
XLRF
79
F0CNT
78
ADFG
77
APC
76
DCHG
75 AUX2
74 TE
73 SE
72 AVSS
71 ADRB
70 ADRT
69 AVDD
68 ADIO
61 CLTV
60 FILO
59 FILI
58 PCO
57 PDO
55 RFI
56 AVSS
54 BIAS
53 AVDD
52 ASYI
51 ASYO
67 VC
66 AUX1
65 FE
64 ABCD
63 BOTM
62 PEAK
50
MVCI
49
D3
48
D2
47
D0
46
D1
45
XWE
44
XRAS
43
A09
42
XCAS
41
XOE
40
DVSS
39
A11
38
A08
37
A07
36
A06
35
A05
34
A04
33
A10
32
A00
31
A01
30
A02
29
A03
28
DVDD
26
XBCK
27
FS256
25
LRCK
24
DADT
23
ADDT
22
DOUT
21
DIN
20
DVSS
19
NC
18
XTSL
17
OSCO
16
OSCI
15
TX
14
XINT
13
RECP
12
DQSY
11
SQSY
10
XRST
9
SENS
8
SRDT
7
XLAT
6
SCLK
5
SWDT
4
MNT3
3
MNT2
2
MNT1
1
MNT0
PWM
GENERATOR
AUTO
SEQUENCER
SERVO
DSP
CPU I/F
MONITOR
CONTROL
CONTROL
SPINDLE
SERVO
EACH
BLOCK
BLOCK
EACH
BLOCK
BLOCK
DIGITAL
AUDIO
I/F
SAMPLING
RATE
CONVERTER
CLOCK
GENERATOR
SUBCODE
PROCESSOR
EACH
BLOCK
BLOCK
A/D
CONVERTER
ANALOG
MUX
EFM/ACIRC
ENCODER/
DECODER
PLL
SHOCK RESISTANT
MEMORY CONTROLLER
ATRAC
ENCODER/DECODER
ADIP
DECODER
COMP
ADDRESS/DATA BUS A00 - A11, D0 - D3
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