SECTION 5
ELECTRICAL ADJUSTMENTS
5-l. A BOARD ASDJUSTMENT
Component Side
I
A board
POSITION ADJUSTMENT
AD
JUS
TMENT
1.
Receive a
signal.
2.
Set the
button to maximum.
3 .
Adjust
to the point where the arrow indi-
cate.
ADJUSTMENT
1.
Recive an off-air signal.
2.
Adjust AGC VR (AGC VR of
so that
snow noise and cross-modulation just disappear
from the picture.
CONTRAST ADJUSTMENT
1.
Receive a color-bar signal.
PICTURE . . . . . . . . . . MAX
BRT . . . . . . . . . . . . . . CENTER
COLOR . . . . . . . . . . . . MIN
2.
Connect circuit between Base of Q354 and
line with a jumper wire.
3.
Draw A-8 C-3 connector (C Board).
4.
Connect an oscilloscope to the pin
of A-8
connector (blue out).
5. Adjust
(SUB CONT) so that voltage is
2.1
1.
Receive an off-air signal.
2 .
Connect circuit between pin of
(H IN)
and pin of
with a jumper wire.
3.
Connect the frequency counter across Base of Q
550 and ground.
4.
Adjust RV501 for
on the fre-
,
counter.
5.
Disconnect a jumper wire from
ADJUSTMENT
1.
Receive an off-air signal.
2.
Connect circuit between pin of
(V IN)
and pin of
with a jumper wire.
3.
Connect the fre uency counter across DY-1
connector (V.DY
6
and ground.
4.
Adjust
for
on the frequency
counter.
5.
Disconnect a jumper wire from
D
1 connector
CHECK
p o i n t
l.
Recive a cross-hatch signal.
2.
Set PICTURE and BRT normal.
3.
Adjust H.CENT (H.CENT TAP=A-13) for best
picture.
I
-
l.
Receive a cross-hatch signal.
2.
Set PICTURE and BRT to normal.
3.
Adjust V.CENT
for best picture.
17
