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LA76810A 
NoA0252-13/40 
Video Block Test Conditions 
Input signal 
Symbol 
Test point 
Input signal
Test method 
Bus bit/input signal 
Video overall gain 
(Contrast max) 
CONT127 
L-50 
Measure the output signal’s 50IRE amplitude 
(CNTHB Vp-p) and calculate 
CONT127 = 20Log (CNTHB/0.357). 
CONTRAST: 
1111111 
Contrast 
adjustment 
characteristics  
(normal/max) 
CONT63 
L-50 
Measure the output signal’s 50IRE amplitude 
(CNTCB Vp-p) and calculate 
CONT63 = 20Log (CNTCB/0.357). 
CONTRAST: 
0111111 
Contrast  
adjustment 
characteristics 
(min/max) 
CONT0 
L-50 
Measure the output signal’s 50IRE amplitude 
(CNTLB Vp-p) and calculate  
CONT0 = 20Log (CNTLB/0.357). 
CONTRAST: 
0000000 
Video frequency 
Characteristics 1 
(SVHS) 
BW1 
L-CW 
With the input signal’s continuous  
wave = 100kHz, measure the output signal’s 
continuous wave amplitude (PEAKDC Vp-p). 
With the input signal’s continuous  
wave = 6MHz, measure the output signal’s 
continuous wave amplitude (CW7 Vp-p). 
Calculate BW1 = 20Log (CW6/PEAKDC). 
FILTER SYS: 0100 
SHARPNESS: 
000000 
Video frequency 
Characteristics 2 
(PAL) 
BW2 
L-CW 
With the input signal’s continuous  
wave = 3.2MHz, measure the output signal’s 
continuous wave amplitude (CW3.2 Vp-p). 
Calculate BW2 = 20Log (CW3.2/PEAKDC). 
FILTER SYS: 0010 
SHARPNESS: 
000000 
Video frequency 
Characteristics 3 
(NTSC) 
BW3 
L-CW 
With the input signal’s continuous  
wave = 2.6MHz, measure the output signal’s 
continuous wave amplitude (CW2.6 Vp-p). 
Calculate BW3 = 20Log (CW2.6/PEAKDC). 
FILTER SYS: 0000 
SHARPNESS: 
000000 
Video frequency 
Characteristics 4 
(SECAM) 
BW4 
L-CW 
With the input signal’s continuous  
wave = 3.1MHz, measure the output signal’s 
continuous wave amplitude (CW3.1 Vp-p). 
Calculate BW4 = 20Log (CW3.1/PEAKDC). 
FILTER SYS: 1000 
SHARPNESS: 
000000 
wave = 4.43MHz, measure the output signal’s 
continuous wave amplitude (F0P Vp-p). 
FILTER SYS: 010 
Sharpness: 000000 
Chroma trap amount 
PAL 
CtraPP 
L-CW 
Calculate CtraP = 20Log (F0P/PEAKDC). 
With the input signal’s continuous  
wave = 3.58MHz, measure the output signal’s 
continuous wave amplitude (F0N Vp-p). 
FILTER SYS: 000 
Sharpness: 000000 
Chroma trap amount 
NTSC 
CtraPN 
L-CW 
Calculate CtraN = 20Log (F0N/PEAKDC). 
L-0 
Measure the output signal’s 0IRE DC level 
(BRTPL V). 
Brightness:  
0000000 
CONTRAST: 
1111111 
DC transmission  
amount 
ClampG1 
L-100 
Measure the output signal’s 0IRE DC level 
(DRVPH V) and 100IRE amplitude (DRVH Vp-p) 
and calculate ClampG = 100 
×
(1+(DRVPH - BRTPL)/DRVH). 
Brightness:  
0000000 
Contrast: 
1111111 
Y-DL TIME1(SVHS)  
TdY1 
L-50 
Obtain the time difference (the delay time) from 
when the rise of the input signal's 50IRE 
amplitude to the output signal's 50IRE amplitude. 
FILTER SYS:0100 
Y-DL TIME2(PAL)   
TdY2 
L-50 
Obtain the time difference (the delay time) from 
when the rise of the input signal's 50IRE 
amplitude to the output signal's 50IRE amplitude. 
FILTER SYS:0010 
Y-DL TIME3(NTSC)   
TdY3 
L-50 
Obtain the time difference (the delay time) from 
when the rise of the input signal's 50IRE 
amplitude to the output signal's 50IRE amplitude. 
FILTER SYS:0000 
Y-DL TIME4(SECAM)   
TdY4 
L-50 
Obtain the time difference (the delay time) from 
when the rise of the input signal's 50IRE 
amplitude to the output signal's 50IRE amplitude. 
FILTER SYS:1000 
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