Sony PMC-107, Service Manual

Page: 18 / 51

– 18 –
oscilloscope
(DC range)
CD board
TP (FE)
TP (TE)
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 simple adjustment are only a little
different, return the controls to the original position.
Procedure:
1. Keep the set horizontal.
If the set not horizontal, this adjustment cannot be performed due
to the gravity against the 2-axis device.
2. Insert disc (YEDS-18) and push the
fl
button.
3. Connect the oscilloscope between TP (FE) and TP (VC).
4. Adjustment RV704 so that the waveform is as shown in the
figure below. (focus gain adjustment)
• Correct Example
5. Connect the osilloscope between TP (TE) and TP (VC).
6. Adjust RV703 so that the waveform is as shown in the figure
below. (tracking gain adjustment)
• Correct Example
• Incorrect Examples (DC level changes more than on adjusted
waveform)
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
100 mV
0 V
250 mV
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
75 mV
100 mV
• Incorrect Examples (fundamental wave appears)
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
Adjustment Location : See page 19.
low focus gain
high focus gain
low tracking gain
high tracking gain
(higher fundamental wave than for low gain)