Sharp VL-PD3AS - Page 32

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VL-PD3AS/AH/AE
15. VF sub-brightness R/B adjustment
Test point TL8842(VR), TL8841(VG), TL8843(VB) Address VCR ADJ 81(R), VCR ADJ 82(B)
Mode VCR AV input
Procedure 1) Input white 40% signal into the AV input and standard monitor.
2) Adjust it with the VCR ADJ address 81/82 so as to obtain the same color as the standard monitor.
Adjustment Standard monitor
rating
Examples • During IC702 or IC8800 replacement.
14. VF sub-contrast R/B adjustment
Test point TL8842(VR), TL8841(VG), TL8843(VB) Address VCR ADJ 84(VR), VCR ADJ 85(VB)
Mode VCR AV input
Procedure 1) Use 3-STEP staircase wave as an input signal.
2) Adjust the 100% waveform of TL8841(VG) and TL8842(VR) between amplitudes to the specified level.
3) Adjust the 100% waveform of TL8841(VG) and TL8843(VB) between amplitudes to the specified level.
Adjustment 0 ± 40mV(VR
100
- VG
100
), 0 ± 40mV(VB
100
- VG
100
)
rating
Examples • During IC702 or IC8800 replacement.
VG
100
/VR
100
/VB
100
Vp
-
GND
13. VFγ1 adjustment
Test point TL8841(VG) Address VCR ADJ 87
Mode VCR AV input
Procedure 1) Use 3-STEP staircase wave as an input signal.
2) Change VCR ADJ:8C to 1F.
3) Adjust the waveform of TL8841(VG) between white 100% and white 100% with VCR ADJ:87 to 5.1 ± 0.1Vp-p.
4) Then adjust the same waveform with VCR ADJ:83 to 3.4 ± 0.1Vp-p.
5) Return VCR ADJ:8C to the former state.
Adjustment 5.1 ± 0.1Vp-p (VCR ADJ:87)
rating 3.4 ± 0.1Vp-p (VCR ADJ:83)
Examples • During IC702 or IC8800 replacement.
Sig. center
5.1Vp-p 0.1Vp-p
3.4Vp-p 0.1Vp-p
GND
12. VF contrast adjustment
Test point TL8841(VG) Address VCR ADJ 83
Mode VCR AV input
Procedure 1) Use 3-STEP staircase wave as an input signal.
2) Change VCR ADJ:8C to 1F.
3) Set the address 86/87 to FF.
4) Adjust the waveform of TL8841(VG) between pedestal and 100% to the specified level.
5) Return VCR ADJ:8C to the former state.
Adjustment 2.0Vp-p ± 0.1Vp-p
rating
Examples • During IC702 or IC8800 replacement.
2.0Vp-p 0.1Vp-p
GND