User manual SENNHEISER HDI 405 P1

[. . . ] The "HiOyn" compressor in the transmitter is not, unlike the corresponding »HiOyn" expandor in the receiver HOl 234, litted with an ON/OFF switch. The SI 234 can therefore only be used in conjunction with the HOl 234. [. . . ] The SI 234 can therefore only be used in conjunction with the HOl 234. The entire receiver circuitry as weil as the controls are built into the ear pieces. The ring-shaped ear cushions and the softly padded headband make these headphones very comfortable to wear over both long and short periods 01time. II in addition to the inlrared system you also wish to connect a wire-bound headphone to your amplilier but only have one connecting socket, the problem is easily solved by plugging it onto the back contacts 01the universal connector. II your amplilier is fitted with a dice-5 socket you merely have to remove the lorward section 01the connector in order to obtain the corresponding dice-5 plug. Wear the receiver with the receiving diode 5 pointing towards the front (figure 2). Fault Only strong hissingnoise can be heard Despite the volume controls being at a high setting, no signal is audible Distortion Slight hissing Very little dynamic Cau5e a) Transmitter not yet switched on b) Transmitter faulty (possibly mains fuse) a) Transmitter not modulated, L e. Audio signal is not present b) Battery in the receiver is empty Receiver battery running low Transmitter SI 234 not properly positioned "HiDyn" switch in "Off" position. Invisible infrared light is emitted not only by your transmitter but also by natural light sources such as the sun and other artificial sources such as lamps, heaters etc. Perfect sound transmission is dependent on the amount of power radiated by the transmitter, the size of the room and the ratio of emitted power to the interference light in the transmission area. [. . . ] Audio signal is not present b) Battery in the receiver is empty Receiver battery running low Transmitter SI 234 not properly positioned "HiDyn" switch in "Off" position. Invisible infrared light is emitted not only by your transmitter but also by natural light sources such as the sun and other artificial sources such as lamps, heaters etc. [. . . ]