HPS-2971
3.3.6 Pin-Cushion & Shape of Raster
a)
Connect the receiver to a 117V
AC
line.
Turn on the TV and adjust bright and contrast control to max. position,
saturation and volume to min. Position. Wait for the heat period (please see
the specification for this model).
b)
Apply to the antenna input a 60dB
µ
V level signal with 88% modulated
“CROSSHATCH” pattern (frequency and channel factory defined).
c)
Turn the face tube to West/Lest orientation.
d)
Adjust bright and contrast control to “PP” position.
e)
For the next reads, please take references by
figure F
(distances in
millimeters).
f)
Observe the screen pattern, to calculate:
Top-Bottom = 2(c1 + c2)/(AD + BC) X 100
Left-Right = 2(d1 + d2)/(AB +CD) X 100
(*) Check for signals PAL-M and PAL-N
Minimum
Nominal
Maximum
Unit
TOP-BOTTOM
-
-
1,50
%
LEFT-RIGHT
-
-
2,00
%
3.4
Purity
a)
Connect the receiver to a 117V
AC
line
Turn on the TV and adjust bright to nomi nal position and contrast control to
min. position, saturation and volume to min. position.
b)
Apply to the antenna input a 60dB
µ
V level signal with 88% modulated
“WHITE” pattern (frequency and channel factory defined).
c)
Wait for pre-heating period (30 minutes).
d)
Turn the face tube to West/Lest orientation.
e)
Degauss the device properly.
f)
Increment the contrast controls to max. position, and wait for 3 minutes
SCREEN CENTER
