Panoramic TVP-2914, Руководство по обслуживанию

Страница: 14 / 52

TVP-2914
13
2.3.2 Frame centralization
Preparation:
a)
Connect the receiver under test to a 117 V
AC
line.
Turn On the TV and position the bright and contrast control to the
maximum, and the saturation and volume controls to the minimum position.
Wait for a pre-heating period.
b) Apply a CIRCLE pattern 60dB
µ
V signal with 88% modulation ( The
preferred channel will be define by the fabric unit ).
c) Position to “nominal” the bright and contrast controls.
d) For the next reading, please observe the figure B.
e) Observe the image and make the measures (in centimeters) of the
distances a, b, c and d.
f) Apply the following formula to calculate the horizontal centralization.

(a/b)-(d/c)

g) Observe the image and make the measures (in centimeters) of the
distances p, q, r and s.
h) Apply the formula to calculate the vertical centralization.

(p/q)-(s/r)

Minimum Nominal Maximum Unit
|(a/b)-(c/d)| - 0,00 0,10
|(p/q)-(r/s)| - 0,00 0,20
2.3.3 FRAME ASPECT RELATED
a) Connect the receiver under test 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.
b) Apply to the antenna input a 60dB
µ
V level signal with 88% modulated
PHILIPS pattern (Frequency and channel factory defined)
c) Adjust bright and contrast control to nominal position
d) For the next reads, please utilizes figure C for reference.
e) Observe the screen pattern and check the distances a, b, c, d (in
centimeters)
f) Apply the formula: