A maintenance apparatus simplifies the cam mechanism for moving a capping mechanism and wiper mechanism, thereby making the printer smaller. A knee panel member is mounted to the curved bracket at a location spaced from the associated cross beam. The neck has a first braid angle. The signal processing circuit executes a signal processing of the edge timing representing signal in response to the enable signal. The controller is connected to the communication ring and is configured to align counters of test instruments to derive a common clock time value from the clock signal.