Tools and Test Equipment.
Carefully remove all loose dirt from optical windows.
Dampen a folded lens tissue with lens cleaning compound.
Lightly and slowly wipe the optical windows.
stroke, discard tissue.
Repeat until glass surfaces are
Indicator lamps may be replaced as follows:
Unscrew and remove lens cap.
Remove faulty lamp from lens cap.
Install new lamp in lens cap.
Install lens cap.