Troubleshooting - Technics SU-C700 Owner's Manual

Troubleshooting

Before requesting service, make the following checks. If you
are uncertain about some of the check points, or if the
solutions indicated in the following guide does not resolve
the issue, then consult your dealer for instructions.
To return all settings to the factory defaults
When the following situations occur, reset the memory:
≥ There is no response when buttons are pressed.
≥ You want to clear and reset the memory contents.
When the unit is off:
1 Press and hold [AMP Í].
2 While continuing to hold [AMP Í], raise the power
switch lever of this unit to the [Í/I] position.
≥ Keep holding [AMP Í] until the PC indicator and the
COAX2 indicator blink twice.
Heat buildup of this unit.
≥ This unit becomes warm when the volume is high. This is
not a malfunction.
A "humming" sound can be heard during
playback.
≥ An AC power supply cord or fluorescent light is near the
cables. Keep other appliances and cords away from the
cables of this unit.
≥ Set the [ATTENUATOR] switch to [ON]. (
≥ A strong magnetic field near a TV or other device may
adversely affect the audio quality. Keep this unit away from
such devices.
≥ The speakers may output noise when a device nearby is
emitting powerful radio waves, such as when a mobile
phone is on a call.
No sound.
≥ Check connections to speakers and other equipment.
After checking the connections, measure the
characteristics of the amplifier. (
≥ Check to see if the correct input source is selected.
≥ Insert the plugs of the cables to be connected all the way in.
≥ Playback of multi-channel content is not supported.
≥ The digital audio input terminals of this unit can only detect
linear PCM (LPCM) signals. For details, refer to the
operating instructions of the connected device.
The remote control does not work properly.
≥ To avoid interference, please do not put any objects in front
of signal sensor. (
≥ Change the remote control code if other products react to
this remote control. (
16
7)
13)
7)
14)
Pressing [DIMMER] changes the display and the
basic control switches brightness of the ST-
C700/SL-C700.
≥ [DIMMER] works for the ST-C700/SL-C700 as well as this
unit. Turn off the device that you want to maintain the
brightness level of, and press [DIMMER].
The peak power meter does not operate.
≥ In the following cases, this meter does not operate:
– When a headphone plug is connected.
– When the peak power meter light is turned off by pressing
[DIMMER].
– When this unit is muted by pressing [MUTE].
The system control function is not working.
≥ Use the system connection cables supplied with the ST-
C700/SL-C700.
≥ Connect the system connection cables to the system
terminals [CONTROL1]/[CONTROL2].
Connect the ST-C700 to [CONTROL1] and the SL-C700 to
[CONTROL2].
≥ Connect coaxial digital cables to the digital audio input
terminals [COAX1 IN]/[COAX2 IN].
Connect the ST-C700 to [COAX1 IN] and the SL-C700 to
[COAX2 IN].
The unit turns off automatically.
≥ Is the auto off function turned on? (
≥ If the ST-C700 is connected to this unit via the system
control function, this unit may automatically enter standby
mode when the ST-C700 enters standby mode. (
≥ This unit incorporates a protection circuit to prevent
damage caused by heat buildup. When you use this unit at
a high volume level for a long period of time, it may turn off
automatically.
Wait for this unit to cool down before turning on this unit
again. (For approximately 3 minutes)
Input indicator blinks.
≥ In the following cases, the input indicator blinks:
– When this unit is muted by pressing [MUTE].
– "PC", "COAX1", "COAX2", "COAX3" or "OPT" is selected, but no
device is connected.
– Audio signals, such as sampling frequency components, are not
input correctly.
14)
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