Sony CDX-C480 / CDX-C580 Service Manual ▷ View online
– 21 –
FM SENS/IF Adjustment
Setting:
SOURCE button
: FMI
D-BASS switch
: OFF
Frequency Select switch (E model) : FM 200K
Procedure:
Adjust for a maximum reading on level meter.
FEB1
87.5 MHz
Adjustment Location: See page 22.
AM SENS Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
Frequency Select switch (E model) : AM 10K
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB = 1
µ
V
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
its internal block is difficult to repair.
FM Center Adjustment
Setting:
SOURCE button
: FMI
D-BASS switch
: OFF
Frequency Select switch (E model) : FM 200K
FM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
50
Ω
50
Ω
Carrier frequency: 97.9 MHz
Output lever
Output lever
: 60 dB (1 mV)
Mode
: mono
Modulation
: 1 kHz, 75 kHz deviation (100%)
+
–
FM CENTER
OUT
(Both side
of R24.)
IC1 pin
#¶
IC1 pin
#¢
digital
voltmeter
voltmeter
0 dBs
–3 dBs
(fc–10)
fc
(fc+10)
(kHz)
FM RF signal
generator
dummy
antenna
50
Ω
50
Ω
4
Ω
antenna
terminal
terminal
set
SPEAKER OUT
+
–
level
meter
meter
AM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
SPEAKER OUT
level
meter
meter
+
–
30
Ω
4
Ω
15 pF
30 pF
Procedure:
Adjust for a maximum reading on level meter.
IFT1, 3
1,400 kHz
Adjustment Location: See page 22.
Procedure:
1. Adjust IFT4 on TU1 so that the reading on the digital voltmeter
1. Adjust IFT4 on TU1 so that the reading on the digital voltmeter
becomes in 0
±
30 mV.
2. Output an Fcenter 10 dB signal output from FM RF signal
generator so that the speaker out is –20 dBs.
3. Change the FM RF signal generator frequency and check the
deviation of the frequency on + side and – side when the speaker
out drops 3 dB. (Both + side and – side is approx. 50 kHz.)
out drops 3 dB. (Both + side and – side is approx. 50 kHz.)
4. Re-adjust IFT4 on TU1 when the difference deviation of the
frequency does more than 10 kHz.
Adjustment Location: See page 22.
– 22 –
Carrier frequency: 1000 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)
Procedure:
1. Adjust IFT3 on TU1 so that the reading on the digital
1. Adjust IFT3 on TU1 so that the reading on the digital
voltmeter is 1.5
±
0.2 V.
Adjustment Location: tuner assy (TU1)
AM Auto Scan/Stop Level Adjustment
Setting:
SOURCE
n MODE button
: AM
D-BASS switch
: OFF
Frequency Select switch (E model) : AM 10K
AM RF signal
generator
dummy
antenna
antenna
terminal
terminal
set
SPEAKER OUT
level
meter
meter
+
–
30
Ω
4
Ω
15 pF
30 pF
+
–
digital
voltmeter
voltmeter
S-METER OUT
Adjustment Location: tuner assy (TU1)
– tuner assy (TU1) (component side) –
AM AUTO
SCAN/STOP
LEVEL ADJ
IFT3
AM SENS
ADJ
IFT3 IFT1
FEB1
FM SENS/IF
ADJ
IFT4
FM CENTER
ADJ
– tuner assy (TU1) (conductor side) –
IC1
R24
S-METER
OUT
FM CENTER
OUT
OUT
‘
’
– 23 –
CD SECTION
Note:
1. CD Block basically constructed to operate without adjustment.
1. CD Block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
3. Use the oscilloscope with more than 10 M
Ω
impedance.
4. Clean an objective lens by an applicator with neutral detergent
when the signal level is low than specified value with the following
checks.
checks.
Focus Bias Adjustment
Setting: This adjustment is performed with the set placed
horizontally.
Focus Gain Adjustment (Coarse adjustment)
This adjustment is not required unless the following parts are replaced:
•
•
Optical pick-up
•
RV4
Procedure:
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
1. Set RV4 to the standard position. (mechanical center)
2. Check whether operation noise (while noise type) caused by
the 2-axis device (lens section of the optical pick-up) is
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
abnormally loud.
If the operation noise is too loud, turn RV4 slightly counter-
clockwise.
•
If the gain is too low:
Focus does not function and no music is selected.
Focus does not function and no music is selected.
•
If the gain is too high:
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Noise caused by scratches and dust is heard and the operation
becomes unstable.
Adjustment Location: servo board
Adjustment Location: servo board (component side)
Procedure:
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
1. Connect an oscilloscope between TP (RF) and TP (RF. GND)
on the SERVO board.
2. Connect the power supply.
3. Push the RESET button (S900) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
3. Push the RESET button (S900) on the MAIN board.
4. Insert the disc (YEDS-18) and playback.
5. Adjust RV1 so that the oscilloscope waveform is clear and check
RF signal level is correct or not.
Note: Clear RF signal waveform means that the sharp “
≈
” can be
clearly distinguished at the center of the waveform.
• When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
Adjustment Location: servo board
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
IC3
CN1
IC1
CN2
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
+
–
–
– 24 –
4-1. IC PIN DESCRIPTION
• IC801 MB90574FPV-G-111 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
LD ON
O
Laser power ON/OFF control pin
2
FOK
I
Focus signal detection input
3
XLAT25
O
CD signal process latch output
4
DATA25
O
CD signal process serial data output
5
XRSRO
O
CD signal process IC reset output
6
GFS
I
GFS signal detection input
7
NIL
—
Not used. (Connect to GND.)
8
VCC
—
Power supply (+5 V)
9
PLL SI
I
PLL data input
10
PLL SO
O
PLL data output
11
PLL CKO
O
PLL clock output
12
NOSE
I
Front panel connect detection input
13
LCD SO
O
LCD serial data output
14
LCD CKO
O
LCD serial clock output
15
BEEP
O
Buzzer control output
16
DBMOD2
O
D-BASS mode set signal output
17
SQSI
I
SUB Q data input
18
NIL
—
Not used. (Connect to GND.)
19
SQCKO
O
SUB Q read clock output
20
UNI SI
I
BUS system serial interface input
21
UNI SO
O
BUS system serial interface output
22
UNI CKI/O
I/O
BUS system serial interface input/output
23
C OUT
I
CD track jump number count input
24
SIRCS
I
Remote commander input
25
SRDT
I
CD-TEXT data input
26
NIL
—
Not used. (Connect to GND.)
27
SCLK
O
CD TEXT data read clock output
28
CLOCK25
O
CD signal process serial clock output
29
SYSRST
O
System reset control output
30
DEEM
O
Emphasis control output
31
DBMOD1
O
D-BASS mode set signal output
32
MD ON
O
Machanism deck section power supply control output
33
VSS
—
GND
34
C
—
Capacitor terminal for power supply.
35
CD ON
O
CD power supply control output
36
BUS ON
O
BUS ON control output
37
AD ON
O
Power control output for A/D conversion.
38
DVCC
—
Power supply for D/A converter.
39
DVSS
—
GND for D/A converter.
40
TEST
I
Test mode direct setting input
41
VOL CE
O
Electric volume serial chip enable output
42
AVCC
—
Power supply for analog circuit.
43
AVRH
—
Power supply for A/D converter.
44
AVRL
—
Power supply for A/D converter.
45
AVSS
—
GND for analog circuit.
46
KEY IN0
I
Key input
47
KEY IN1
I
Key input
48
KEY IN2
I
Key input for D-BASS rotary switch.
49
RC IN0
I
Rotary commander input
50, 51
NIL
—
Not used. (Connect to GND.)
52
MPDH
I
Tuner multi-pass input
SECTION 4
DIAGRAMS
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