Sony XES-Z50 (serv.man4) Service Manual ▷ View online
– 25 –
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV3 on
Tuner unit (TU101) for
minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV3 on
Tuner unit (TU101) for
minimum reading.
FM Stereo Separation Adjustment (WIDE)
Setting:
[SOURCE]
button: FM
Adjustment Procedure:
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 35 dB
Adjustment Location: Control Unit (Tuner unit (TU101))
(See page 29.)
FM Stereo Separation Adjustment (NARROW)
Setting:
[SOURCE]
button: FM
Adjustment Procedure:
1. Push the
1. Push the
[D LABEL]
button and set to NARROW mode.
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: Control Unit (Tuner unit (TU101))
(See page 29.)
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%)
sub: 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot: 7.5 kHz deviation (10%)
0.01
µ
F
set
antenna terminal
+
–
–
LINE OUT (REAR) jack
level meter
10 k
Ω
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%)
sub: 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot: 7.5 kHz deviation (10%)
0.01
µ
F
set
antenna terminal
+
–
–
LINE OUT (REAR) jack
level meter
10 k
Ω
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
Tuner unit (TU101) for
minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on
Tuner unit (TU101) for
minimum reading.
– 26 –
MW Auto Scan/Stop Level Adjustment
Note:
Make this adjustment after “FM Auto Scan/Stop Level Adjustment.”
Setting:
[SOURCE]
button: MW
Adjustment Procedure:
1. Set to the test mode. (See page 24.)
2. Press the
1. Set to the test mode. (See page 24.)
2. Press the
[SOURCE]
button on the wireless remote commander
to select MW.
Display
3. Press the
[LIST]
button on the wireless remote commander to
display “PRESET NAME LIST”.
4. Using cursor buttons on the wireless remote commander, se-
lect preset No.3, and press the
[ENTER]
button.
Display
5. Adjust with the volume RV1 on Tuner unit (TU101) so that
the “MW” indication turns to “MW0” indication on the dis-
play window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
play window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: Control Unit (Tuner unit (TU101))
(See page 29.)
FM RDS S-Meter Adjustment
Setting:
[SOURCE]
button: FM
Adjustment Procedure:
1. Set to the test mode. (See page 24.)
2. Push the
1. Set to the test mode. (See page 24.)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Push the
[DSPL]
button.
4. Adjust RV101 on Tuner unit so that the display indication is
“13.0”.
Display
Specification: Display indication: 12.8 to 13.2.
Adjustment Location: Control Unit (Tuner unit)
(See page 29.)
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
Output level
: 35 dB (56.2
µ
V)
Mode
: stereo
Modulation
: main: 1 kHz, 20 kHz deviation (26.5%)
sub: 1 kHz, 20 kHz deviation (26.5%)
sub: 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot: 7.5 kHz deviation (10%)
0.01
µ
F
set
antenna terminal
Test
STATION
Test
STATION
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
µ
V)
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna terminal
Test
TP
Test
TP
Test
TP
– 27 –
Tracking Offset Adjustment
Condition: This adjustment is performed with the set place hori-
zontally.
Connection:
Adjustment Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VC) on the
1. Connect the oscilloscope to TP (TE) and TP (VC) on the
DRIVER board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Press the cursor buttons on the wireless remote commander,
3. Press the cursor buttons on the wireless remote commander,
observe the traverse waveform *.
4. Adjust the RV101 on the DRIVER board so that the oscillo-
scope reading is symmetrical in relation to 0 ± 0.05 V.
* Traverse waveform: This is the tracking error waveform appears
when crossing the track.
VOLT/DIV : 1 V (with the 10: 1 probe in use)
TIME/DIV : 2 msec
CENTER : 0 ± 0.05 V
TIME/DIV : 2 msec
CENTER : 0 ± 0.05 V
Connection and Adjustment Location: DRIVER board
(See page 29.)
+
–
–
TP (TE)
TP (VC)
TP (VC)
DRIVER board
oscilloscope
(DC range)
CD SECTION
Notes:
1.
Perform adjustments in the order given.
2.
Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indi-
cated.
cated.
3.
Use the oscilloscope with more than 10 M
Ω
impedance.
4.
Power supply voltage requirement: DC 14.4 V
(more than 5 A)
(more than 5 A)
5.
In making adjustment, connect the control unit and changer unit.
Focus Bias Adjustment
Condition: This adjustment is performed with the set placed hori-
zontally.
Connection:
Adjustment Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on the
1. Connect the oscilloscope to TP (RF) and TP (VC) on the
DRIVER board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Adjust the RV102 on the DRIVER board so that the waveform
3. Adjust the RV102 on the DRIVER board so that the waveform
on the oscilloscope (eye pattern) is good.
A good eye pattern means that the diamond shape (≈) in
the center of the oscilloscope can be clearly distinguished.
the center of the oscilloscope can be clearly distinguished.
•
RF signal reference waveform (eye pattern)
VOLT/DIV : 200 mV (with the 10: 1 probe in use)
TIME/DIV : 0.5 µsec
TIME/DIV : 0.5 µsec
Note: When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
Connection and Adjustment Location: DRIVER board
(See page 29.)
+
–
–
TP (RF)
TP (VC)
TP (VC)
DRIVER board
oscilloscope
(AC range)
1.1 Vp-p
+0.3
–0.2
–0.2
A
B
0
±
0.05 V
C=1.8
±
0.3 V
traverse waveform
(100 track jump waveform)
(100 track jump waveform)
C
– 28 –
DISPLAY SECTION
Contrast Adjustment
Note on adjustment: Adjust the contrast at “8” of 15 steps.
Connection:
Connection:
Adjustment Procedure:
1. Fix display board and rear panel with screws.
2. Connect the display board and liquid crystal module.
3. Connect the front panel of which status is as shown above to
1. Fix display board and rear panel with screws.
2. Connect the display board and liquid crystal module.
3. Connect the front panel of which status is as shown above to
the control unit. (Display will turn on.)
4. After the display turned on, allow ten minutes to elapse, then
connect a digital voltmeter to TP1 and TP2 of liquid crystal
module.
module.
5. Adjust RV801 on the display board so that the reading of digi-
tal voltmeter satisfies the specified value.
Specified Value: 20.95 V to 21.00 V
Adjustment Location: DISPLAY board (See page 30.)
+
–
–
TP1
TP2
TP2
liquid crystal
module
digital voltmeter
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