Repeat the steps for “REAR” terminal and rear push button. If wiring between transformer and push button(s) check out properly, replace chime. • Check Transformer:Test transformer voltage output with a volt meter. If a volt meter is not available, momentarily touch the two low-voltage terminals with a screwdriver. You will see a small spark if transformer is operating properly. If no spark is evident, replace transformer. • Check Push Button(s):Remove suspected push button from door frame, disco