Abstract: A trouble checking apparatus for checking a trouble in a circuit or system. Data related to operating conditions of the circuit are inputted. A defective condition is checked for each of different regions of the circuit to provide a check result based upon the inputted data. The region is displayed in a graphic manner. The manners in which the circuit is presented at different regions of the circuit are controlled based upon the check results made for the respective regions.

Abstract: The present invention relates to a thermosetting acrylic resin powder coating composition and comprises specified four components (A) to (D), said four components (A) to (D) being:(A) a mixture of a glycidyl-containing acrylic resin and a hydroxyl-containing acrylic resin, or a glycidyl- and hydroxyl-containing acrylic resin,(B) a blocked isocyanate compound having a melting point of 60.degree. to 140.degree. C. and solid at room temperature,(C) an aliphatic dibasic acid or anhydride thereof, and(D) at least one tin compound represented by the formula SnO.sub.2, R.sub.2 SnO, R.sub.2 SnX.sub.2, R.sub.2 Sn(OCOR').sub.2, ##STR1## R.sub.3 SnX, R.sub.3 Sn-O-SnR.sub.3, ##STR2## or R.sub.4 Sn wherein R is phenyl or alkyl having 1 to 18 carbon atoms, X is halogen, alkoxyl having 1 to 18 carbon atoms or hydroxyl, R' is alkyl or alkenyl having 1 to 18 carbon atoms and n is an integer of 1 to 5.