A test apparatus for a thermal resistor includes a control device, a temperature processing circuit, a voltage regulating circuit and a temperature detecting circuit. A client station will detect a request to initiate a voice call, and before actually initiating the call the client station will send a message into a network indicating how to carry out a location-based service. The first resilient member is arranged to retain the cable fixing washer on the shaft portion of the cable fixing bolt is located. An electrode formed on respective ink channels is taken as common electrode, while electrodes formed on respective dummy channel are taken as individual electrodes, thus causing no ink to be contacted with a passivation film formed on the individual electrodes.