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KV-X297
4-2. VOLUME ELECTRICAL ADJUSTMENTS
1+
8 (+135V) ADJUSTMENT (RV601)
I
I
PULSE WIDTH & V-PIN ADJUSTMENTS (RV 1851/1853) [
D BOARD
; - 1
CN0529
,~
RV601
I
+Sl
04
RVlSS3
m
wJ
n-:Jl
L[JJ
I. Switch on the power
to
the TV set.
..,
Connect a digital multi-meter to pin
CD
of
CN0529 on
0 board.
3. Adjust RV601 on
0
board to +135V
±
O.5V.
RVlSS1
I
PULSE WIDTH
I
CN1S23
I
AGe ADJUSTMENT (IF BLOCK)
I
I. Connect an oscilloscope to pin
G)
of T I851.
2. Preset RV-1853
to
center of its range (mechanical center).
3. Adjust RV-I SS I to obtain minimum amplitude.
.:J..
Switch the oscilloscope input to D.C.and adjust RV-18S3
to obtain -33.2
±
O.SV.
V1
Adjusting range
1
•V1MAX + 1Vf----'<---------.,
APPROX. -25V
I.
Receive an off-air signal.
..,
Adjust the AGC
VR
so that there is no snow noise
or cross-modulation visible on the screen.
3. Change the receiving channel and confirm status.
-V1MAX
..
Left rotation
Degree of RV 1851 Rotation
Right rotation
(R maximum)
(L maximum)
-36-
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