Sony WX-C5000 Service Manual ▷ View online
21
SHUF1
PRESET
SHUF1
PRESET
SHUF1
antenna
terminal
terminal
FM RF signal
generator
0.01
µ
F
set
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.
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
Display
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button
: FM
FREQUENCY SELECT switch : FM 200k
3. Push the preset 3 button.
Display
4. Adjust with the volume RV2 on TU1 so that the “FM”
indication turns to “2” indication on the display window.
But, in case of already indicated “2”, turn the RV2 so that put
out light “2” indication and adjustment.
But, in case of already indicated “2”, turn the RV2 so that put
out light “2” indication and adjustment.
Display
0 dB = 1 µV
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 Stereo Separation Adjustment
3. AM Auto Scan/Stop Level Adjustment
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Scan/Stop Level Adjustment
Carrier frequency : 97.9 MHz
Output level
Output level
: 22 dB (12.6 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
Adjustment Location : See page 23.
main board
TP-L
TP-R
TP-L
TP-R
test tape
P-4-D400
(400 Hz, 0 dB)
P-4-D400
(400 Hz, 0 dB)
level meter
set
set
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
AUDIO OUT REAR
10 k
Ω
See the adjustment location from on page 23 for the
adjustment.
adjustment.
TAPE SECTION
Tape Speed Adjustment
Procedure :
1. Put the set into the FWD PB mode.
1. Put the set into the FWD PB mode.
Specification : Constant speed
Frequency counter
3,010 to 3,030 Hz
Adjustment Location : Capstan motor internal volume
(See page 23)
DOLBY Level Adjustment
Setting :
Preset 3 (SHUF/;) button : Light down mark ;
(DOLBY OFF)
Procedure :
1. Put the set into the FWD PB mode.
2. Adjust RV100 (L-CH) and RV200 (R-CH) on main board so
1. Put the set into the FWD PB mode.
2. Adjust RV100 (L-CH) and RV200 (R-CH) on main board so
that level meter reading is – 6 ± 0.5 dB (0.37 to 0.41 V).
Adjustment Location : See page 23.
0 dB = 0.775 V
22
AM Auto Scan/Stop Level Adjustment
Note : This adjustment should be performed after the FM Auto
Scan / Stop Level Adjustment is done.
Setting :
SOURCE
t MODE button
: AM
FREQUENCY SELECT switch : AM 10k
SHUF1
PRESET
SHUF1
PRESET
SHUF1
antenna
terminal
terminal
set
AM RF signal
generator
AM dummy
antenna (50
antenna (50
Ω
)
65 pF
15 pF
set
30
Ω
Carrier frequency : 1000 kHz
Output level
Output level
: 30 dB (44.7 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode. (See page 20.)
2. Push the SOURCE button.
3. Push the MODE button and set to AM.
1. Set to the test mode. (See page 20.)
2. Push the SOURCE button.
3. Push the MODE button and set to AM.
Display
4. Push the preset 3 button.
Display
5. Adjust with the volume RV1 on TU1 so that the “AM”
indication turns to “2” indication on the display window. But,
in case of already indicated “2”, turn the RV1 so that put out
light “2” indication and adjustment.
in case of already indicated “2”, turn the RV1 so that put out
light “2” indication and adjustment.
Display
Adjustment Location : See page 23.
antenna
terminal
terminal
0.01
µ
F
set
level meter
FM RF signal
generator
AUDIO OUT REAR
10 k
Ω
FM Stereo Separation Adjustment
Setting :
SOURCE button
: FM
FREQUENCY SELECT switch : FM 200k
Carrier frequency : 97.9 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%)
sub :1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot : 7.5 kHz deviation (10%)
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 23.
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
maximum reading.
maximum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1 for
maximum reading.
maximum reading.
Procedure :
23
TAPE SPEED ADJ
TU1
RV1 AM AUTO SCAN/STOP LEVEL ADJ
RV2 FM AUTO SCAN/STOP LEVEL ADJ
RV200 (R-CH) DOLBY LEVEL ADJ
RV4 FM STEREO SEPARATION ADJ
RV100 (L-CH) DOLBY LEVEL ADJ
– set upper view –
RV200
(R-CH)
(R-CH)
RV100
(L-CH)
(L-CH)
DOLBY
LEVEL
ADJ
– set lower view –
TP-R
TP-L
DOLBY LEVEL
ADJ
Adjustment Location :
24
FOCUS GAIN ADJ
RV4
RV1
FOCUS BIAS ADJ
IC3
CN2
CN1
IC1
TP
(RF)
CN3
IC2
TP
(RF GND)
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
RF signal waveform
RF level :
1.0 – 1.5 Vp-p
1.0 – 1.5 Vp-p
oscilloscope
servo board
TP (RF)
TP (RF GND)
(DC range)
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.
following 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:
•
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 (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 (SW701) on the control 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 (SW701) on the control 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.
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