Sony PMC-107 Service Manual page 18

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:
CD board
TP (FE)
TP (TE)
TP (VC)
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
• Incorrect Examples (DC level changes more than on adjusted
waveform)
low focus gain
high focus gain
oscilloscope
(DC range)
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
100 mV
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
250 mV
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
100 mV
75 mV
0 V
– 18 –
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 (fundamental wave appears)
low tracking gain
high tracking gain
(higher fundamental wave than for low gain)
Adjustment Location : See page 19.
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V
VOLT/DIV : 100 mV
TIME/DIV : 2 mS
0 V