Advertisement
Focus Bias Adjustment
Pro cedure:
audio amp board
'
oscilloscope
@
I
7P3 QO<—*——-0 +
TP10 ae
Pe
(ground point) )
—wor- rm
TP1 Ome 5
. Put set in adjustment mode.
(see page 38)
. Turn RV1O1
(GFS) fully in the direction of the
arrow,
(see above)
. Connect
oscilloscope
to audio
amp
board
test
point TP1 and TP10 (ground point).
. Adjust
tentatively so that oscilloscope reading is
DC OV.
. Insert disc (YEDS-1) and press >PLAY button.
. Connect
oscilloscope
to audio
amp
board
test
point TP3 and TP10 (ground point).
. Adjust
RV406
for an
optimum
waveform
eye
pattern or so that the peak is maximum.
Opti-
mum eye pattern means that the shape "0" can be
clearly distinguished at the center of the waveform.
RF signal waveform
8.
ARERR
RRS
NWR
KKRRRXRKRAR)
'CURE
When
observing the eye pattern, set the oscillo-
scope for AC range and raise the vertical sensitivity.
After adjustment,
return
RV101
to the original
setting.
Adjustment Location:
Audio amp board
(ground point)
Advertisement
