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Service control adjustments
Tuner assembly adjustments
(1) Receive the PAL colour bar pattern.
PAL colour
bar pattern
(2) Connect the oscillator to TP - Y(+) and TP - E( - ) on the
COMB FILTER PCB ASS'Y.
(Oscilloscope
sens. ~ 0.2V/div)
COMB FILTER PCB ASS'Y
VR2801
/
\
~ 02001
00 . . . . . . .
K78CM
1 . .
0
0
0
o
8TP-Y
(3) By using VR2801
on the COMB
FILTER
PCB ASS'Y,
adjust the amplitude
as shown below.
0.05
Vp- p
The following
components
of Tuner Assembly
(645 000 1192)
_
can be ordered separately:
Tuner
Ass'y
(645
0001192)
Ref. No.
Part No.
Description
AlolA
6450001208
UV Varactor Tuner
I
A101B
6450005312
IF Pack
1
+ When you order these components
together
as the Tuner
Assembly, they do not need to be adjusted.
Since each components
is pre - adjusted
at the time of
shipment, it does not usually require further adjustment,
even
when purchased
separately.
However,
if there is any such
need, you can follow the instructions
below to perform
the
adjustment.
AGC Adjustment
Note: Do not attempt this adjustment
with the weak signal.
(1) Tune the receiver to the most clearest (or strongest)
VHF
_
station in your area,
Set the brightness and the contrast to maximum.
Set the colour to minimum.
(2) Turn the AGC control (SVR101 ) of the IF Pack in direction
which
causes
the
snow
to
armears, then in opposite
direction until the snow just disappears.
>
0
0
0
Q1
+
BQ133
%
AGC Adjustment
MAIN UNIT
–7–
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