Rev. 1.0 - 19 -LD630D/LD640D4. Self-TestThe self-test checks whether the printer has any problems.(Users cannot perform this procedure if using the printer’s label peel-off option.)If the printer does not function properly, contact an authorized dealer.The self-test checks the following;1) Make sure that the paper roll has been installed properly.2) Turn on the power while holding down the FEED button. The self-test begins.(It takes about 5 seconds before starting self-test)3) The self-test prints the current printer configuration information.4) After the self-test results are printed out, a printer enters into Print Standby Mode.