Patent ID: 8358339

Claim:
A testing method for conducting a test on a plurality of sheet substrates having predetermined processing performed thereon, the testing method comprising: a processing step of repeatedly performing the predetermined processing on the sheet substrates N times (N being a natural number of 2 or larger) in a sequential manner, while the sheet substrates are being transported on a conveyor line; and a testing step of conducting a test on the first one of the sheet substrates among the plurality of the sheet substrates having the nth time processing (n being a natural number of N or smaller) first performed thereon, and returning the tested first sheet substrate to a spot behind one of the other sheet substrates having the nth time processing completed thereon, wherein the predetermined processing in the processing step is printing processing performed by repeatedly printing silver paste on the sheet substrates, to form bumps with a predetermined height on the sheet substrates, and wherein the testing step includes checking whether each of the bumps exists properly, has the predetermined height, and is located in a predetermined position.