Patent Document ID: 20170021612
Application ID: 15287371
Patent Status: 0

Claim One:
1. A method of testing a print head comprising a plurality of recording elements, the method comprising: grouping the plurality of recording elements into a plurality of groups, and setting a test order of the plurality of recording elements in units of groups; periodically performing a test of the plurality of recording elements in units of groups in the set test order; recognizing the recording element in which an abnormality is detected, as a retest target, in a case where an abnormality is detected in at least one recording element among the plurality of recording elements in the test; performing a retest of at least the recording element that is a retest target through interruption before a test to be performed in a test order before a change by changing the test order in a case where the recording element that is a retest target is recognized; and recognizing the recording element that is a retest target as an abnormal recording element in a case where an abnormality is detected again in the recording element that is a retest target as a result of the retest.