Focus Bias; Focus Bias Adjustment - Sony CDU31A Series Service Manual

5-1-6 Focus Bias
a. Connect the CH-I probe of oscilloscope to RFO
tenninal on fixture CDI and GND. (Refer to Fig.
5-1-6 (a))
Note: Set the ".:l.cilloscope as below
Display : CH-I
I
AC mode (20mV/div.)
Trigger : AUTO mode
b. Select Play TNO by hitting the
IFtol
key in Test Mode
menu .
. c. Select No. 18 with arrow key, then hit IEnterl key.
d. Adjust the RVlOl so that the jitter of wavefonn is
minimum and so that output level is maximum. (Refer
to Fig. 5-1-6 (b))
RV101
Fig. 5-1-6 {a) Focus Bias Adjustment
Fig. 5-1-6 {b)
5-6