TB1274BFG
2005-08-18
31
NOTE
ITEM
MEASURING METHOD
CHROMA SECTION
COMMON TEST CONDITION FOR CHROMA SECTION
①
Set the BUS data as Y1/C1 input is selected via I2C BUS.
②
Set the BUS data as BPF f0 is through, Color system is Europe mode and P/N GW is 2.0μs.
C1
APC pull-in/hold range
①
Input color signal(4.43PAL, 100mVp-p) to pin 48(C1-IN).
②
Increase its frequency until Cb-OUT at pin 22 is discolored(upper hold range), and decrease its frequency
until Cb-OUT is colored(upper pull-in range).
③
In the same way, decrease its frequency until Cb-OUT is discolored(lower hold range), and increase its
frequency until Cb-OUT is colored(lower pull-in range).
④
Calculate the differences between the frequencies and center frequency(4.43MHz).
C2
Killer operation input level
①
Set the BUS data as P/N ID is Normal.
②
Input color signal(3.58NTSC) to pin 48(C1-IN).
③
While attenuating the burst signal, measure the burst amplitude when Cb-OUT(pin 22) is discolored.
④
Set P/N ID Low, and measure killer level as well.
⑤
Input 4.43PAL color signal to pin 48, and measure items in the same way as①to④.
C3
Demodulation
output
residual
carrier
①
Input 3.58NTSC or 4.43NTSC rainbow color bar signal(burst=100mVp-p) to pin 48(C1-IN).
②
Measure sub-carrier leak’s amplitude in Cb signal of pin 22 and Cr signal of pin 23 respectively.
C4
Demodulation
output
residual
higher harmonic
①
Input 3.58NTSC or 4.43NTSC rainbow color bar signal(burst=100mVp-p) to pin 48(C1-IN).
②
Measure higher harmonic’s amplitude (2fc=7.16MHz or 8.86MHz) in Cb signal of pin 22 and Cr signal of
pin 23 respectively.
C5
fsc free-run frequency
①
Input nothing into pin 48(C1-IN).
②
Change setting of Color system according to respective frequency modes.
③
Measure frequency of fsc signal of pin 46 respectively.