Panoramic TVP-2914, Service Manual

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TVP-2914
14
M = (a + b + c + d) / 4 , and verify the proportion a/M, b/M, c/M e d/M.
Check for systems PAL-M and PAL-N
Minimum Nominal Maximum Unit
a/M 0,95 1,00 1,05
b/M 0,95 1,00 1,05
c/M 0,95 1,00 1,05
d/M 0,95 1,00 1,05
2.3.4 Horizontal Linearity
a) Connect the receiver under test in 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)l
c) Adjust bright and contrast control to nominal position
d) For the next reads, please take references by figure D.
e) Observe the screen pattern and check the distances An - 15 blocks (in
centimeters)
f) Calculate the middle distances through blocks
M = An/15.
Horizontal deviation between major blocks (DH
M
)
Read first the 15 blocks wide (from b1 to b15) and select the biggest read
(b
max
) for calculate the deviation:
DH
M
= b
máx
/M
Minor Horizontal deviation between blocks (DH
m
)
Read first the 15 blocks wide (from b1 to b15) and select the smallest read
(b
min
) for calculate the deviation:
DH
m
= b
mín
/M
(*)Check for signals PAL-M and PAL-N