Electrical Adjustments - Sony HCD-GS10 Service Manual

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
BD90 board
TP (RFI)
TP (VC)
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 (◊) in the
center of the waveform can be clearly distinguished.
Checking Location:
– BD90 Board (Side B) –
TP
(VC)
TP
(RFI)
IC101
SECTION 5

ELECTRICAL ADJUSTMENTS

oscilloscope
(DC range)
+
–
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ± 0.3 Vp-p
TUNER SECTION
(Except UK)
[AM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: AM
loop antenna A loop antenna B
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
MAIN board
Output level: 54 dBuV ANTENNA
CN802 pin 2 , 3
[FM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
FM RF signal
MAIN board
generator
ANTENNA
CN802 pin 1
0.01 µ F
MAIN board
75kHz frequency
ANTENNA
deviation by 1 kHz
CN802 pin 2
signal
Output level: as low as possible
(8dBuV)
MAIN board
TP (TUNER–VT)
TP (TUNER–GND)
• Repeat the procedures in each adjustment several times.
HCD-GS10/GS30DAB
Ver. 1.2
0 dB=1 µV
60 cm
level meter
32 Ω
+
set
–
HP board
PHONES jack (J102)
level meter
32 Ω
+
set
–
HP board
PHONES jack (J102)
digital voltmeter
100 k Ω
17