13
Setting Up
Audio equipment connections
■
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.
■
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)
■
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 VOL-
UME 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.
Stereo System
11
Summary of Contents for PortaTone PSR-640
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