Sony CDX-3150 Service Manual ▷ View online
– 13 –
2-9. SERVO BOARD
2
arm (roller)
3
roller assy
4
PS 2x3
5
LOAD SW board
Fig. 1
4
loading motor assy
6
PS 2x4
2
CN2
7
SERVO board
5
PS 2x4
1
CN3
3
P 2x3
1
tension spring (RA)
washer
arm washer
arm
washers
2-10. ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
arm (roller) and washers. (Fig. 1)
– 14 –
2-11. CHASSIS (OP) (O/S) ASSY
2-12. OPTICAL PICK-UP BLOCK
8
compression spring (FL)
1
tension spring (angle)
5
Turn loading ring in the
direction of the arrow.
direction of the arrow.
2
damper (T)
3
damper (T)
6
chassis (OP) (O/S) assy
4
Fit lever (D) in the
direction of the arrow.
direction of the arrow.
7
compression spring (FL)
3
optical pick-up block
1
P 2x3
2
sled motor assy
– 15 –
SECTION 3
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 per-
formed easier than it in ordinary procedure.
Stop Level and MW Auto Scan/Stop Level adjustments can be per-
formed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “OFF” mode.
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
1. Set the “OFF” mode.
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
1. Push the OFF button.
TUNER SECTION
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.
Note on Adjustment
The adjustments of tuner section, should be performed according to
the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. MW Auto Scan/Stop Level Adjustment
the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. MW Auto Scan/Stop Level Adjustment
0 dB = 1 µV
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FMI
FM RF signal
generator
0.01 µF
antenna
terminal
terminal
set
Carrier frequency : 98.0 MHz
Output level
Output level
: 22 dB (12.6 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FMI.
1. Set to the test mode.
2. Push the SOURCE button and set to FMI.
Display
3. Push the preset 3 button.
Display
4. Adjust with the volume RV2 on TU1 so that the “FMI”
indication turns to “FMI I” indication on the display window.
But, in case of already indicated “FMI I”, turn the RV2 so that
put out light “I” indication and adjustment.
But, in case of already indicated “FMI I”, turn the RV2 so that
put out light “I” indication and adjustment.
Display
SHUFFLE
SHUFFLE
SHUFFLE
FM
I
FM
I
FM
I I
Adjustment Location : See page 17.
– 16 –
MW Auto Scan/Stop Level Adjustment
Setting :
SOURCE
n MODE button : MW
FM Noise Focus Adjustment
Setting :
SOURCE button : FMI
Carrier frequency : 98.0 MHz
Output level
Output level
: 60 dB (1 mV)
Mode
: stereo
Modulation
: 1 kHz, 75 kHz deviation (100%)
FM RF signal
generator
antenna
terminal
terminal
set
0.01 µF
level meter
SPEAKER OUT
Procedure :
1. Tune the 98.0 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
1. Tune the 98.0 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
(A) – 30 ± 1 dB then signal generator input set to – 19 dB.
Adjustment Location : See page 17.
FM Stereo Separation Adjustment
Setting :
SOURCE button : FMI
FM RF signal
generator
Carrier frequency : 98.0 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%)
antenna
terminal
terminal
set
0.01 µF
level meter
SPEAKER OUT
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.
minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1 for
minimum reading.
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 25 dB
Adjustment Location : See page 17.
Procedure :
AM RF signal
generator
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 µV)
AM dummy
antenna (50
antenna (50
Ω
)
antenna
terminal
terminal
set
15 pF
30
Ω
65 pF
Procedure :
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
1. Set to the test mode. (See page 15.)
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 TU1 so that the “MW” indication
turns to “MWI” indication on the display window.
But, in case of already indicated “MWI”, turn the RV1 so that put
out light “I” indication and adjustment.
But, in case of already indicated “MWI”, turn the RV1 so that put
out light “I” indication and adjustment.
Display
SHUFFLE
ST
SHUFFLE
ST
SHUFFLE
ST
Adjustment Location : See page 17.
MW
MW
MW
4
Ω
4
Ω
I
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