ASTRO-PHYSICS 1568GTO Bakım Talimatları Kılavuzu - Sayfa 14

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Red filteR sCReen RePlaCement foR KeYPad

We recommend that the clear plastic protective window be kept in place to prolong

the life of the red filter. nevertheless, there may come a time when the red filter

becomes scratched or fogged and prevents the display from being easily read. it is

possible to acquire a replacement filter (e0190filteR).

begin replacement by backing off the six cover screws. You will need to use a #0 Phillips screwdriver (reference the earlier

section on opening the keypad).

With the cover screws backed off, (there is no need

to remove them), lift off the cover. there are six

standoff washers with each screw. make certain

they are not lost. they can be kept with the screw

on the cover.

unplug the cable connections and set the cover

aside. depending on the model of keypad that you own, there may be anywhere from one to

three cables to unplug. make note of the connector placements for reassembly later.

fold back the display panel ribbon cable so the display and Pc board are out of the way of the filter. see above photos.

You will need to remove the original filter by prying it loose from

the cover. this may be done by carefully prying the upper edge

away from the cover, or by pushing from the other side, or by a

combination of the two techniques. by gentle pressure you will

break the glue bond.

With the old filter removed, check for remaining adhesive

residue and remove with paper towel. do not use acetone or

any chemical that will melt the plastic.

before exposing the adhesive, seat the filter first so you get an idea of

where it sits. although the newer filter is framed, the window in the case is

small enough so you don't have to worry about the frame being seen.

the new filter has a clear protective acetate on both sides

plus a adhesive with a waxed paper backing on both sides.

both clear acetates are to be removed and only the white

3mvhb backing removed to expose it's adhesive (do this

after testing the filter placement).