Sony HCD-NEZ30 Service Manual - Page 15

Focus, Check

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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 oscilloscope (DC range) TP (RFACI) + TP (VC) - Procedure : 1. Connect oscilloscope to TP (RFACI) and TP (VC) on the CD board. 2. Press the I/1 button to turn the power ON. 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) - TP (VC) IC201 TP (RFACI) HCD-NEZ30 15

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15
HCD-NEZ30
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 TP (RFACI) and TP (VC) on the CD
board.
2.
Press the
I/
1
button to turn the power ON.
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
TP (RFACI)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
0.9
±
0.4 Vp-p
TP
(VC)
TP
(RFACI)
IC201
– CD Board (Conductor Side) –