Sharp VL-AX1S/H Service Manual page 31

10. VF contrast adjustment
Test point TL8841(VG)
Mode VCR AV input
Procedure 1) Input the signal of a 3-step waveform.
2) Set VCR ADJ EB/ED to FF/00.
3) Adjust the pedestal 100% range of the waveform of TL8841 to the specified adjustment value.
4) Return VCR ADJ ED to the initial value. (Initial value: 7A)
2.0Vp-p ± 0.1Vp-p
Adjustment
rating
Examples • During IC705 or IC8800 replacement.
11. VFγ1 adjustment
Test point TL8841(VG)
Mode VCR AV input
Procedure 1) Input the signal of a 3-step waveform.
2) Set VCR ADJ ED to 00.
3) Adjust the white 100% range of the waveform of TL8841 to 5.6±0.1Vp-p with VCR ADJ EB.
4) Then adjust the same waveform VCR ADJ E5 to 3.2±0.1Vp-p.
5) Return VCR ADJ ED to the initial value. (Initial value: 7A)
5.6 ± 0.1Vp-p (VCR ADJ EB)
Adjustment
3.2 ± 0.1Vp-p (VCR ADJ E5)
rating
Examples • During IC705 or IC8800 replacement.
12. VF sub-brightness R/B adjustment
Test point TL8842(VR), TL8841(VG), TL8843(VB)
Mode VCR AV input
Procedure 1) Input white 40% signal into the AV input and standard monitor.
2) Adjust it with the VCR ADJ E9/EA so as to obtain the same color as the standard monitor.
Adjustment Standard monitor
rating
Examples • During IC705 or IC8800 replacement.
Address VCR ADJ E5
2.0Vp-p
GND
Address VCR ADJ EB
Sig. center
GND
Address VCR ADJ E9(R), VCR ADJ EA(B)
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VL-AX1S/H/E/EW/EX
0.1Vp-p
5.6Vp-p 0.1Vp-p
3.2Vp-p 0.1Vp-p