Prima PS-42D8 B Service Manual page 5

compared with cathode ray tube, it can be found in the moving picture that at the brim of the
face of a person there are some wrong colors.
1.17 During the display of graph (indicating the gradual change in brightness horizontally or
vertically) resulting from gray scale test it can be found that the brightness for the two adjacent
levels is uneven. This is caused by the reuse of sub-field, the display of load rectification and
the eletrolyzation.
1.18 The screen front plate is of glass. Please make sure that the screen has been put in place
during erection. If it is not in place before the erection begins it may lead to screen crack or
breakage.
1.19 Make sure the screw used in the mounting of the screen is of the original specs lest it should
cause damage to the screen due to mismatch. Special care should be taken not to use too long
or too big screw.
1.20 Care must be taken to guard against dust during assembling or dismantling, especially to avoid
dirt from falling in between the screen and the glass lest it should harm the receiving and
viewing effect.
1.21 There is piece of insulator stuck on the rear chassis corresponding to the power supply board.
It is used to isolate the cool part from the hot part. Please take care to keep it intact lest it
should become a potential safety trouble.
1.22 In addition to plasma screen, the glass is a part of high value. It has such functions as
anti-radiation, adjustment of color temperature etc. Please handle it carefully.
2."Criterion for Identifying the Defects on Screen"
The PDP produced by our Company at present uses the following criterion for identifying the
defective points:
MODEL PS-42D8 B/S,PH-42D8:
There may appear three kinds of defective points for this model as shown in Fig.1, i.e.bright spot
(remain bright); dark spot (non-illuminating); flickering spot (continuously flickering).
However they should not exceed the specification as in table 1. Otherwise the product shall
be deemed as sub-standard.
H
W
Zone B
Zone A
W/4 W/2
Figure 1
H/4
H/2
H/4
W/4
Defective Points
3