Read Sony CMT-GS10 / CMT-GS30DAB / HCD-GS10 / HCD-GS30DAB Service Manual online
17
HCD-GS10/GS30DAB
Checking Location:
+
–
–
BD90 board
TP (RFI)
TP (VC)
TP (VC)
oscilloscope
(DC range)
Procedure :
1. Connect oscilloscope to TP (RFI) and TP (VC) on the BD90
board.
2. Press the
I/
1 button to turn the power ON, and press
the Z (CD) button to open the CD 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 (
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
TIME/DIV: 500 ns
level:
1.2
1.2
±
0.3 Vp-p
TP
(VC)
TP
(RFI)
IC101
– BD90 Board (Side B) –
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
SECTION 5
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1
µ
V
(Except UK)
[AM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: AM
FUNCTION: TUNER
TUNER/BAND button: AM
[FM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
FUNCTION: TUNER
TUNER/BAND button: FM
•
Repeat the procedures in each adjustment several times.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: 54 dBuV
60 cm
set
loop antenna A loop antenna B
+
–
–
level meter
32
Ω
HP board
PHONES jack (J102)
PHONES jack (J102)
MAIN board
ANTENNA
CN802 pin
2
,
3
FM RF signal
generator
75kHz frequency
deviation by 1 kHz
signal
Output level: as low as possible
(8dBuV)
deviation by 1 kHz
signal
Output level: as low as possible
(8dBuV)
+
–
–
level meter
set
32
Ω
0.01
µ
F
HP board
PHONES jack (J102)
PHONES jack (J102)
MAIN board
ANTENNA
CN802 pin
1
MAIN board
ANTENNA
CN802 pin
2
digital voltmeter
100 k
Ω
MAIN board
TP (TUNER–VT)
TP (TUNER–GND)
Ver. 1.2
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