Patent ID: 7479793

Claim:
A method of checking a defect of a semiconductor test apparatus for testing a wafer comprising: providing a pogo connector connected to a tester of the semiconductor test apparatus; connecting a probe card to the pogo connector and to a test pattern formed on a wafer to test whether the semiconductor test apparatus is defective; replacing the probe card with a probe card for test having a conductive plate when the test result indicates that the semiconductor test apparatus is malfunctioning; testing the semiconductor test apparatus using the replaced probe card for test; and determining whether either one of the probe card and the pogo connector is defective, based on the test result, wherein the probe card is determined to be defective when a current obtained through the probe card for test is within an allowed range; and the pogo connector is determined to be defective when a current obtained through the probe card for test deviates from the allowed range.