— 26 —
• Good Example
• Incorrent Examples (DC level changes more than on adjusted
waveform)
low focus gain
high focus gain
low tracking gain
high tracking gain
(high fandametial wave than for low gain)
• Incorrect Examples (fundamental wave appears)
8.
Connect the oscilloscope between TP (TRACKING-Y) and TP
(VC).
9.
Adjust RV703 so that the waveform is as shown in the figure
below. (tracking gain adjustment)
Oscilloscope
(DC range)
+
–
CD board
TP (TRACKING-Y)
TP (FOCUS-Y)
TP (VC)
The following is a simple adjustment method.
– Simple Adjustment –
Note:
Since exact adjustment cannot be performed, remember the
positions of the controls before performing the adjustment.
If the positions after the primary adjustment are only a little
different, return the controls to the original position.
Procedure:
1. Keep the set horizontal.
If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.
2. Connect the oscilloscope TP (FOCUS-Y) and TP (VC) on the
CD board.
3. Insert the disc (YEDS-18) in and close the lid for CD.
4. Press the
^
button.
5. Adjust RV704 so that the waveform is as shown in the figure
below. (Focus gain adjustment)
100mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
VOLT/DIV : 100mV
TIME/DIV : 2ms
250mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
100mV
75mV
0V
VOLT/DIV : 1V
TIME/DIV : 2ms
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
0V
Note:
VOLT/DIV: with the 10:1 probe in used.
Adjustment Location: CD board (See page 27.)
Содержание PMC-222V
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