Yamaha 640 Owner's Manual - Page 13
Audio equipment connections, Connecting a microphone (PSR-740), AUX OUT R and L/L+R jacks, PHONES jack - amplifier
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Setting Up Audio equipment connections s AUX OUT R and L/L+R jacks The rear-panel AUX OUT R and L/L+R jacks deliver the output of the PSR-740/640 for connection to a keyboard amplifier, stereo sound system, a mixing console, or tape recorder. If you will be connecting the PSR-740/640 to a monaural sound system, use only the L/L+R jack. When a plug is inserted into the L/L+R jack only, the left- and right-channel signals are combined and delivered via the L/L+R jack so you don't lose any of the PSR-740/640 sound (use phone plugs). CAUTION • Connect the PSR-740/640 to external equipment only after turning off power for all devices. To prevent damage to the speakers, set the volume of the external devices at the minimum setting before connecting them. Failure to observe these cautions may result in electric shock or equipment damage. Stereo System s PHONES jack A standard pair of stereo headphones can be plugged in here for private practice or late-night playing. The internal stereo speaker system is automatically shut off when a pair of head phones is plugged into the PHONES jack. Do not listen with the headphones at high volume for long periods of time. Doing so may cause hearing loss. Connecting a microphone (PSR-740) s MIC/LINE IN jack The PSR-740 includes a microphone/line input jack into which just about any standard microphone or line-level source with a 1/4" phone plug can be plugged (a dynamic microphone with an impedance of 250 ohms is recommended). The microphone or line input can be used with the PSR-740's vocal harmony function (pages 82). The panel MIC/LINE switch should be set according to the type of source used and the INPUT VOLUME control can be used to adjust the level of the microphone or line input signal. The SIGNAL and OVER indicators on the panel aid in setting the ideal input level: the green SIGNAL indicator should light when an input signal is present, but if the red OVER indicator lights the level should be reduced by using the INPUT VOLUME control, and if this is not sufficient, by reducing the level of the source signal itself. • The Yamaha MZ106s microphone is recommended for use with the PSR-740. • The level of the microphone sound may vary considerably according to the type of microphone used. • Turn the INPUT VOLUME control all the way down when connecting or disconnecting a microphone. • Placing a microphone which is connected to the PSR-740 too close to the PSR-740 speakers (or those of an external sound system connected to the PSR-740) can cause feedback. Adjust the microphone position and the INPUT VOLUME level or MASTER VOLUME control level if necessary, so that feedback does not occur. 13 11