Sony HCD-HX7 Service Manual - Page 17

Hcd-hx3/hx5/hx7, Electrical, Checks

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SECTION 5 ELECTRICAL CHECKS TUNER SECTION FM TUNE LEVEL CHECK signal generator set Procedure: 1. Turn on the set. 2. Input the following signal from signal generator to FM antenna input directly. Carrier frequency: A = 87.5 MHz, B = 98 MHz, C = 108 MHz Deviation Modulation ANT input : 75 kHz : 1 kHz : 35 dBu (EMF) Note: Use 75 ohm coaxial cable to connect signal generator and the set. You cannot use video cable for checking. Use signal generator whose output impedance is 75 ohm. 3. Set to FM tuner function and tune A, B and C signals. 4. Confirm "TUNED" is lit on the display for A, B and C signals. When the selected station signal is received in good condition, "TUNED" is displayed. CD SECTION Note: 1. CD Block is basically constructed to operate without adjustment. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10 MΩ impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. 5. Check the focus bias check when optical pick-up block is replaced. FOCUS BIAS CHECK CD board TP121 (RFI) TP124 (VC) oscilloscope (DC range) + - Procedure : 1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the CD board. 2. Press the I/1 button to turn the power on, and press the Z button to open the disc tray. 3. Set disc (YEDS-18) on the tray and press the CD u button to playback. 4. Confirm that oscilloscope waveform is as shown in the figure below. (eye pattern) A good eye pattern means that the diamond shape (◊) in the center of the waveform can be clearly distinguished. VOLT/DIV: 200 mV TIME/DIV: 500 ns level: 0.9 ± 0.4 Vp-p Checking Location: - CD Board (Conductor Side) - TP124 (VC) TP121 (RFI) IC101 HCD-HX3/HX5/HX7 17 17 HCD-HX3/HX5/HX7

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HCD-HX3/HX5/HX7
17
17
HCD-HX3/HX5/HX7
CD
SECTION
Note:
1.
CD Block is basically constructed to operate without adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
5.
Check the focus bias check when optical pick-up block is replaced.
FOCUS
BIAS
CHECK
Procedure :
1.
Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
CD board.
2.
Press the
I/
1
button to turn the power on, and press
the
Z
button to open the disc tray.
3.
Set disc (YEDS-18) on the tray and press the
CD
u
button
to playback.
4.
Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
Checking Location:
+
–
CD board
TP121 (RFI)
TP124 (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
0.9
±
0.4 Vp-p
SECTION
5
ELECTRICAL
CHECKS
TUNER
SECTION
FM
TUNE
LEVEL
CHECK
Procedure:
1.
Turn on the set.
2.
Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency: A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note:
Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3.
Set to FM tuner function and tune A, B and C signals.
4.
Confirm “TUNED” is lit on the display for A, B and C signals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
signal
generator
set
TP124
(VC)
– CD Board (Conductor Side) –
TP121
(RFI)
IC101