Read Sony CFD-G30L / CFD-G50L Service Manual online
SECTION 5
DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION
— 11 —
— 12 —
BATT board
BATT COM board
POWER board
CONTROL-1 board
CONTROL-3 board
TUNER board
HEADPHONE board
LINE IN board
PRE board
MAIN board
LCD board
CD board
CONTROL-2 board
CD SECTION
Focus Bias Check
This check is to be done when the optical block replaced.
Check Procedure:
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
CD board.
2. Put the set into test mode.
3. Opitical pick-up setting to the center by + or – button pushing.
4. Insert disk (YEDS-18) and press u button.
5. Press the MODE button. (Tracking servo ON)
6. Check that the oscilloscope wavewform is as shown in the figure
3. Opitical pick-up setting to the center by + or – button pushing.
4. Insert disk (YEDS-18) and press u button.
5. Press the MODE button. (Tracking servo ON)
6. Check that the oscilloscope wavewform 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.
7. Release test mode after adjustment is completed.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensivity.
and raise vertical sensivity.
[Adjustment Location : CD board] (Conductor side)
VOLT/DIV : 0.2V
TIME/DIV : 500ns
TIME/DIV : 500ns
0.9Vp-p – 1.3Vp-p
+
–
–
Oscilloscope
(DC range)
TP
(RF)
TP(VC)
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