Sony CDX-4240R / CDX-4250R Service Manual ▷ View online
– 17 –
SHUF
SHUF
FM RF signal
generator
0.01
µ
F
antenna
terminal
terminal
set
+
–
FM RF signal
generator
0.01
µ
F
antenna
terminal
terminal
set
LINE OUT REAR
10 k
Ω
level meter
FM Stereo Separation Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
SOURCE button : FM
Carrier frequency : 98.00 MHz
Output level
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main : 1 kHz, 20 kHz deviation (26.5%)
sub : 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot : 7.5 kHz deviation (10%)
19 kHz pilot : 7.5 kHz deviation (10%)
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 TU601
for nimum reading.
for nimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU601
for minimum reading.
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 28 dB
Adjustment Location : See page 18.
Procedure :
Carrier frequency : 98.00 MHz
Output level
Output level
: 35 dB (56.2
µ
V)
Mode
: mono
Modulation
: no modulation
Procedure :
1. Set to the test mode. (See page 16.)
2. Push the SOURCE button and set to FM.
1. Set to the test mode. (See page 16.)
2. Push the SOURCE button and set to FM.
Display
FM RDS S-Meter Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
SOURCE button : FM
3. Push the preset 10 button.
4. Adjust RV801 so that the display indication is “16.0”.
4. Adjust RV801 so that the display indication is “16.0”.
Display
Specification : Display indication : 15.8 to 16.2
Adjustment Location : See page 18.
– 18 –
AM RF signal
generator
AM dummy
antenna (50
Ω
)
set
antenna
terminal
terminal
30
Ω
15 pF
65 pF
TU601
RV1
MW AUTO SCAN/
STOP LEVEL ADJ
RV2
FM AUTO SCAN/
STOP LEVEL ADJ
RV801
FM RDS
S-METER ADJ
RV4
FM STEREO
SEPARATION ADJ
(NARROW)
TP
SHUF
TP
SHUF
TP
SHUF
MW Auto Scan/Stop Level Adjustment
Setting :
D-BASS switch
: OFF
SOURCE
n MODE button : MW
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)
Procedure :
1. Set to the test mode. (See page 16.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
1. Set to the test mode. (See page 16.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
Display
4. Push the preset 3 button.
Display
5. Adjust with the volume RV1 on TU601 so that the “MW”
indication 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 : tuner unit (TU601)
Adjustment Location : tuner unit (TU601)
– 19 –
IC3
CN2
CN1
IC1
FOCUS GAIN ADJ
RV4
TP
(RF. GND)
IC2
TP
(RF)
CN3
RV1
FOCUS BIAS ADJ
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
level: 1.0 – 1.5 Vp-p
+
–
–
SERVO board
TP (RF)
TP (RF. GND)
oscilloscope
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
– 20 –
4-1. IC PIN DESCRIPTION
• IC801 MB90574APMT-G-199-BND (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
LD ON
O
Laser ON/OFF control output
2
FOK
I
Focus OK signal detection input
3
XLAT25
O
CD signal processing latch output
4
DATA25
O
CD signal serial data output
5
XRST
O
Reset output to CD signal processor IC.
6
GFS
I
GFS signal detection input
7
NIL
—
Not used. (Connect to ground in this set.)
8
VCC
—
Power supply pin (+5 V)
9 – 11
NIL
—
Not used. (Open)
12
FLS SI/NOSE1
I
Front panel attachment detection input
13
LCD SO/FLS SO
O
LCD serial data output
14
LCD CKO
O
LCD serial clock output
15
BEEP
O
BEEP output
16
NIL
—
Not used. (Open)
17
SQ SI
I
Sub Q data input
18
NIL
—
Not used. (Connect to ground in this set.)
19
SQ CKO
O
Sub Q read clock output
20
UNI SI
I
BUS system serial interface input (Not used in this set.)
21
UNI SO
O
BUS system serial interface output (Not used in this set.)
22
UNI CK
I/O
BUS system serial clock input/output (Not used in this set.)
23
C IN
I
Track jump No. count input
24
SIRCS
I
Remote commander input
25
TXT SI
I
CD-TEXT data input (Not used in this set.)
26
NIL
—
Not used. (Connect to ground in this set.)
27
TXT CKO
O
CD-TEXT data read clock output (Not used in this set.)
28
CLOK25
O
CD signal processing serial clock output
29
SYSRST
O
System reset output (Not used in this set.)
30
DEEMPH
O
De-emphasis output
31
AMP ATT
O
Power amplifier attenuator control output
32
MD ON
O
CD mechanism power control output
33
VSS
—
Ground
34
C
—
Power stabilization capacitor pin
35
CD ON
O
CD power control output
36
BUS ON
O
BUS ON control output (Not used in this set.)
37
NIL
O
Power control output of A/D conversion.
38
DVCC
—
VREF input of D/A converter.
39
DVSS
—
Ground of D/A converter.
40
NIL
—
Not used. (Open)
41
ANGLE
O
LCD view angle alignment output (Not used in this set.)
42
AVCC
—
Analog power supply pin (+5 V)
43
AVRH
—
VREF + input of A/D converter.
44
AVRL
—
VREF – input of A/D converter.
45
AVSS
—
Analog ground
46 – 48
KEY IN0 – 2
I
Key input 0 – 2
49
RC IN0
I
Rotary commander input 0
50
QUALITY
I
Noise detection input
51
NIL
—
Not used. (Connect to ground in this set.)
52
MPDH
I
Tuner multi path input
53
S-METER
I
S-meter voltage detection input
54
VCC
—
Power supply pin (+5 V)
55
NS MASK
O
Noise detection output
SECTION 4
DIAGRAMS
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