Prima PH50D8, Руководство по обслуживанию

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Method of Debugging
For Models PS-42D8 and PH-50D8, the debugging part lies only in the white balance adjustment.
Nothing else should be adjusted and the maintenance software supplied for after-sale purpose has
normally shielded the value of white balance i.e., no more adjustment is needed when upgrading
the software. In case of special circumstances where the main board is replaced following method
can be adopted:
1). The white balance adjustment is made respectively in three ways - TV/AV
、
VGA
、
YpbPr. First
adjust TV/AV, then VGA and YpbPr at the last
2). Select corresponding channels respectively. After successively press the keys on the production
plant’s remote control (the key at the right hand lower corner doesn’t show up), go on to press
the left key, right key, confirmation key on the small keyboard one by one and then it’s possible
to enter the menu set up in the plant.
3). Use the right key to select and calibrate the menu. The white balance adjustment and YpbPr
white balance adjustment are for the purpose of white balance adjustment. For the white
balance adjustment of TV/AV and VGA it’s OK just directly adjust the first item whereas for
YpbPr adjust the second item.
4) For the white balance adjustment of TV/AV and VGA: select the item of “white balance
adjustment” from the menu. When it’s entered (as shown in the fig. Below), keep RCUI
immovable and adjust GCUT and BCUT so as to adjust the white balance of the dark area. For
the adjustment of white balance of the bright area, keep RGR immovable and then adjust
GGRV and BGRV. Repeat the above steps several times until the picture is normal in white
balance.
For the white balance adjustment of YpbPr: select the item of “white balance adjustment” from
the menu. When it’s entered (as shown in the fig. Below), adjust RCUT 、 BCUT and it’s done.
Item Kind Area A Area B Remark
1 Dark spots No more than 4 No more than 10
2 Bright spot No more than 1 No more than 3
3 Flickering
spots
No more than 1 No more than 3
Total number of
defective points in A
and B shall not
exceed 14. The
distance between
two defective points
shall not be shorter
than 10mm.