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1.5. TV receiving test:
1.5.1 TV SIGNAL TEST ITEM
CENTRALISM TRANSMITTING SIGNAL CHECK CONTENT
CHANNEL
FREQUENCY
ORDER
(MHz)
CHANNEL 2
55.25
CHANNEL 6
83.25
CHANNEL 7
175.25
CHANNEL 13
211.25
471.25
CHANNEL 14
603.25
CHANNEL 36
CHANNEL 69
801.25
TV TEST METHOD
A.CHANNEL2 Examines sound by ear, whether the sound does have mechanical resonation and the
electrical unusual sound, and image to sound disturbance.
B.CHANNEL6:
Check sound and picture.
C.CHANNEL7: Examines whether the sound does receive the image disturbance, Judgment basis:
Whether there is unusual sound, input signal LEVEL<=36dBu,and STEREO SENSITIVITY is normal.
D.CHANNEL13: Under main/sub/main-sub mode, check sub function.
E.CHANNEL14: Examines whether the sound does receive the image disturbance, Judgment basis:
Whether there is unusual sound.
F. CHANNEL 36:Check T1 of close-caption. Input signal level<=45dBu.
G.CHANNEL 69: Adjustment attenuator, If the critical point of the change of the image signal to noise
ratio is under LEVEL<=60dBu, regards as normally.
PRODUCTS OUTPUT CHECK ITEM.
A. The same as " CENTRALISM TRANSMITTING SIGNAL CHECK CONTENT"
B. saturation TEST, inputs the TV signal, the input signal LEVEL establishment most greatly is
90dBu,check whether CONTRAST of the image is normal; Whether appears the disturbance
phenomenon.
C.AFT CHECK,
(1) The frequency of the input TV signal is 211.25MHz (CH13), after confirmed the TV set receives
this signal, closure radio station; Then set frequency of the TV signal generator to be 212.25MHz,
turn on the TV set and check whether the TV set receives the signal of CH13.
(2). The frequency of the input TV signal is 211.25MHz (CH13), after confirmed the TV set receives
this signal, closure radio station; Then set frequency of the TV signal generator to be 212.00MHz,
turn on the TV set and check whether the TV set receives the signal of CH13.
(3). After all of FUNCTION TEST completed, we must erase all saved changes again and restore the
factory defaults.
TIMING TABLE (FACTORY PRESET MODE)
Mode
640x480@60 Hz
VGA
640x480@72 Hz
640x480@75Hz
800x600@56Hz
800x600@60Hz
SVGA
800x600@72Hz
800x600@75Hz
1024x768@60Hz
XGA
1024x768@70Hz
1024x768@75Hz
1280x1024@60Hz
XGA
1280x1024@75Hz
WXGA
1440x900@60Hz
UXGA
1680x1050@60Hz
ViewSonic Corporation
SET CONTENT
PATTERN
MONO SCOPE SWEEP TONE
COLOR BAR
400Hz
Full White (100
STEREO
IRE)
STAIR
MULTIBURST
MONO
MULTIBURST
MONO
MONO SCOPE
MONO(1KHz)
Horizontal
Resolution
Frequency
k (
31.469
37.861
37.500
35.156
37.879
48.077
46.875
48.363
56.467
60.023
63.981
79.974
29.830
65.290
21
SOUND
P/S(dB)
-10
ELECTRIC
ABNORMITY SOUND
-10
SOUND ,PICTURE
-10
STERO FUNCTION
DUAL
-10
SUB FUNCTION
-16
IMAGE AND SOUND
DISTURB
-10
TEST Close-caption T1
FUNCTION
-10
NOISE LIMMITTED
SENSITIVITY
Vertical
Frequency
H
) z
(
H
) z
59.940
72.809
75.000
56.250
60.317
72.188
75.000
60.004
70.069
75.029
60.020
75.024
60.019
59.950
Confidential - Do Not Copy
CHECK
CONTENT
(TABLE 2)
Pixel
Frequency
(
M
H
) z
25.175
31.500
31.500
36.000
40.000
50.000
49.500
65.000
75.000
78.750
108.000
135.000
31.500
146.250
N2201w-1M
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