CD Stereo Amplifier / SU-C550

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.

GENERAL QUESTIONS

The unit does not work.
Operations are not done properly.

  • One of the unit's safety devices, etc. may have been activated.
  1. Press [] on the unit to switch the unit to standby.
  2. If the unit does not switch to standby, press [] on the unit for at least 5 seconds. The unit is forcibly switched to standby.
    Alternatively, disconnect the AC mains lead, wait for at least 3 minutes, then reconnect it.
  3. Press [] on the unit to switch on. If the unit still cannot be operated, consult the dealer.

A "humming" sound can be heard during playback.

  • An AC mains lead or fluorescent light is near the cables. Keep other appliances and cords away from the cables of this unit.
  • 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 the volume of this unit.
  • Check connections to speakers and other equipment. After checking the connections, measure the output signal 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 signals. For details, refer to the operating instructions of the device.

Playback does not start.

  • Depending on your environment or connected devices, it may take some time.
  • Check to see if the format of the file is supported. About supported format, refer to "File format". (⇒ Operating Instructions)

The unit turns to standby mode automatically.

  • Is the auto off function turned on ?
  • 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)

The settings are reset to the factory defaults.

  • Updating the firmware may reset the settings.

Please tell me the contents displaying on the main unit's display during playback.

  • In case of input source is DMP, DMR, AirPlay, Spotify, TIDAL or USB, press [INFO] button to display the track, artist, and album names, file type, sampling frequency, and other information.
  • Screen images may differ depending on the firmware version of the main unit. For the update information, refer to the following website.
    www.technics.com/support/firmware/
  1. Input Source
    DMP : Digital Media Player
    DMR : Digital Media Renderer
    AirPlay : AirPlay
    Spotify : Spotify
    TIDAL : TIDAL
    USB : USB device/USB flash drive
  2. The track, artist, and album names
    : Track name
    : Artist name
    : Album name
  3. Random repeat or Repeat playback (for DMP and USB)
    : All tracks in a folder are repeated randomly.
    : Only plays the selected track.
    : All tracks in a folder are repeated.
  4. Elapsed time or remain time, Playback status
    : Elapsed time
    : Remain time
    : Play, Pause, Search (These icons may be not visible depending on Input Source.)
  1. File format (except AirPlay, Spotify)
  1. Sampling frequency
  1. Number of quantisation bits (except MP3, AAC, WMA, DSD)

Disc

Incorrect display or play does not start.

  • Make sure that the disc is compatible with this unit.
  • There is moisture on the lens. Wait for about an hour and then try again.
  • Unfinalised CD-R and CD-RW cannot be played back.
  • WMA/MP3 is not supported. Refer to "Notes on CDs"(⇒ Operating Instructions) for information about the discs this unit can play back.

Playback takes time to start.

  • It may take some time for the disc to load if there are a lot of tracks on it.

USB

The USB drive or its contents cannot be read.

  • Updating the firmware to the latest version. It may be solved.
  • The USB drive format or its contents is/are not compatible with the unit.

No response when [ play / pause ] is pressed.

  • Disconnect the USB device and then reconnect it. Alternatively, turn the unit to standby and on again.

Slow operation of the USB flash drive.

  • Large file size or high memory USB flash drive takes longer time to read.
  • It may take some time if there are a lot of files or folders on it.

Cannot display the information properly.

  • Track names, etc. may not be displayed properly.

iPhone/iPad/iPod

Cannot operate.

  • Select "USB" as the input source.
  • Check that the iPhone/iPad/iPod is connected properly.
  • The battery of the iPhone/iPad/iPod is depleted. Charge the iPhone/iPad/iPod, and then operate again.
  • Connect the iPhone/iPad/iPod again or try to restart the iPhone/iPad/iPod.

iPhone/iPad/iPod does not charge.

  • Only when unit is ON will charging begin from USB cable connection.
  • Make sure the unit is turned on when you start charging.
    – When charging an iPhone/iPad/iPod whose battery is depleted, do not turn this unit to standby mode until the iPhone/iPad/iPod becomes operational.

Bluetooth®

Pairing cannot be completed.

  • Check the Bluetooth® device condition.

The device cannot be connected.

  • The pairing of the device was unsuccessful or the registration has been replaced. Try repairing the device.
  • This unit might be connected to a different device. Disconnect the other device and try repairing the device.

The device is connected, but audio cannot be heard through this unit.

  • For some built-in Bluetooth® devices, you have to set the audio output to "SU-C550" manually. Read the operating instructions for the device for details.

The sound is interrupted.

  • The device is out of the 10 m communication range. Bring the Bluetooth® device closer to this system.
  • Remove any obstacle between this system and the device.
  • Other devices that use the 2.4 GHz frequency band (wireless router, microwaves, cordless phones, etc.) are interfering. Bring the Bluetooth® device closer to this system and distance it from the other devices.
  • Select "Mode 1" for stable communication.

PC

The PC does not recognise this unit.

  • Check your operating environment.
  • Restart the PC, turn this unit to standby and on, and then reconnect the USB cable.
  • Use another USB port of the connected PC.
  • Install the dedicated USB driver if using a PC with Windows.

Cannot play music stored on the PC.

  • This unit does not guarantee playback with all music player applications. Use the dedicated app "Technics Audio Player for Windows / Mac". For information of Technics Audio Player for Windows / Mac, refer to the following website.
    www.technics.com/support/downloads/pc-app/index.html

Network

Cannot connect to the network.

  • Confirm the network connection and settings.
  • If the network is set to be invisible, make the network visible while you set up the network for this unit or make a wired LAN connection.
  • This system's Wi-Fi security supports WPA2™. Your wireless router must therefore be WPA2™ compatible. For details on the security supported by your router and how to change the settings, please refer to the operating instructions or contact your internet service provider.
  • Depending on the compatible device, this unit may not be connected to the network.
    If the network setup screen is not displayed on the Android device even if "http://192.168.1.12/" is input, set the Android device to the airplane mode. Then, set the Wi-Fi setting to On, and make the network connection setting again on the setting menu of this unit.
  • Make sure that the multicast function on the wireless router is enabled.
  • Depending on the router, WPS button may not work. Try other methods.
  • The wireless LAN environment or radio interference in your area may cause connection problem. In this case, try another connection method. If the problem persists, make a wired LAN connection.
  • While the AC mains lead is disconnected, the LAN cable must be connected or disconnected.
  • "For Europe": This unit can be connected only to channels 36, 40, 44 and 48 in the 5 GHz band. Set the channel of your wireless broadband router to any of 36, 40, 44 or 48. For how to set the wireless broadband router, refer to the operating instructions of the router.
  • "For North America": This unit can be connected only to channels 36, 38, 40, 44, 46, 48, 149, 151, 153, 157, 159, 161 and 165 in the 5 GHz band. Set the channel of your wireless broadband router to any of 36, 38, 40, 44, 46, 48, 149, 151, 153, 157, 159, 161 or 165. For how to set the wireless broadband router, refer to the operating instructions of the router.

Cannot select this system as the output speakers.

  • Make sure that the devices are connected to the same network as this system.
  • Reconnect the devices to the network.
  • Turn the wireless router off and then on.
  • Turn this unit to standby and on, and then select this system as the output speakers again.

Playback does not start.
The sound is interrupted.

  • Try to place the speakers further away from this unit.
  • If using the 2.4 GHz band on the wireless router, simultaneous use with other 2.4 GHz devices, such as microwaves, cordless telephones, etc., may result in connection interruptions. Increase the distance between this unit and these devices.
    - If your wireless router supports 5 GHz band, try using the 5 GHz band. To change to the 5 GHz band, redo the network settings using an internet browser and then make sure to select your network name (SSID) for the 5 GHz band.
  • Do not place this system inside a metal cabinet, for it might block the Wi-Fi signal.
  • If the playback stops, check the playback status on the device.
  • Place this system closer to the wireless router.
  • Check the Wi-Fi signal strength using "Signal Level" and adjust location of this unit and the wireless router.
  • If several wireless devices are simultaneously using the same wireless network as this unit, try turning off the other devices or reducing their wireless network usage.
  • Reconnect the devices to the network.
  • Turn the wireless router off and then on.
  • With some iOS and iTunes versions, it may not be possible to restart the AirPlay playback if the selector is changed (e.g. "CD") or this unit is in standby mode, during the AirPlay playback. In this case, select a different device from the AirPlay icon of the Music App or iTunes and then re-select this system as the output speakers.
  • If the above solutions do not solve the problem, make a wired LAN connection for all connected DLNA compatible devices which have LAN terminal (this unit, Network Attached Storage, DLNA server, etc.).

The DLNA server and its contents are not displayed.

  • The connected DLNA server and its contents may not be displayed properly depending on its condition. (e.g. soon after adding the contents to the server, etc.). Try again later. For details, refer to the operating instructions of the DLNA server.

Cannot find music files stored on the PC.

  • When you play back music files over a network, those that are not registered to its network server are not displayed. For details, refer to the operating instructions for your server.

Cannot display the information properly.

  • Track names, etc. may not be displayed properly.

NAS

Playback does not start.

  • Please confirm the update information of NAS.
  • When transcode setting is available, please try to select other settings.

vTuner/Spotify/TIDAL

Playback does not start.
The sound is interrupted.

  • Updating the firmware to the latest version. It may be solved.
  • The station that does not broadcast cannot be played back. (It will be skipped or return to the list.)
  • Internet Radio may not be played back depending on the broadcasting method.
  • Depending on the network condition, playback may not be done properly.
  • Depending on the internet environment or the network congestion, sound may be interrupted or it may take time for playback to start.
  • Internet Radio is an audio broadcasting service transmitted via the Internet. Depending on the broadcaster or condition of the transmitting, the sound quality may vary.
  • Some Internet Radio stations may not be played back due to the restrictions of the country or area.
  • The network service may be suspended or be otherwise unavailable without notice.
  • Change TIDAL sound quality setting for "Settings" of "Technics Music App". The performance may be improved.
  • Video contents of TIDAL cannot be played back.

Cannot display the information properly.

  • Station names, countries, regions, genres, track names, album names, etc. which are managed by vTuner/Spotify/TIDAL, may not be displayed properly depending on the broadcasting information.
  • Depending on the internet environment or the network congestion, the information may not be displayed or it may take time to be displayed.

Cannot find stations.
Cannot play registered stations on this unit and listed stations with PC.

  • The Internet Radio stations, genre, region, etc. on this unit are edited and managed by vTuner. The stations on the list of vTuner may be changed without notice.
  • The Internet Radio service may be suspended or be otherwise unavailable without notice.

Cannot display an album art of TIDAL on the dedicated app "Technics Music App".

  • Update this unit to the latest firmware. It may be displayed.

"Operate via App" message appears, and Spotify/TIDAL cannot be played.

  • Operate via Technics Music App.

Remote control

The remote control does not work properly.

  • The batteries are depleted or inserted incorrectly.
  • 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.

Messages
The following messages or service numbers may appear on the unit’s display.

""

  • The selected file cannot be played back.
  • Select the playable file.
    - About supported format, refer to "File format". (⇒ Operating Instructions)

"AUTO OFF"

  • The unit has been left unused for about 20 minutes and will shut down within a minute. Press any button to cancel it.

"Checking Device"

  • The unit is checking the connected iPhone/iPad/iPod or a USB device. After this display has disappeared, start operating.

"Connect to Network"

  • Connect this unit to the network and then wait for the start of the Firmware Update via Internet.

"Connect USB Device"

"Download Fail"

  • The firmware download has failed. Press any button to exit. Please try again later.
  • The server cannot be found. Press any button to exit. Make sure that the network is connected to the internet.

"Empty"

  • The selected folder is empty. Move tracks into the folder and retry the operation.
  • The server is not found on the network. Check to see if the server is connected to the same network as this unit, and retry the connection to this unit.

"Error"

  • Incorrect operation is performed. Read the instructions and try again.

"Fail"

  • Network connection is not complete. Try the setting again.

"Firmware update is available"

  • The firmware (free of charge) for this unit is available.
  1. Press [OK].
  2. Press [ up ], [ down ] to select "Yes" and then press [OK].
- The progress is displayed as "Updating □%" while updating. ( □ stands for a number.)
- Do not disconnect the AC mains lead or turn this unit to standby while updating.
- When the update has finished successfully, "Success" is displayed.

"F□□" ("□" stands for a number.)

  • There is a problem with this unit.
    - Is the volume extremely high? If so, lower the volume.
    - Is this unit placed in an extremely hot place? If so, move this unit to a cooler place and wait a few moments and then try to turn it on again.
    If the problem persists, write down the displayed number, disconnect the AC mains lead and consult your dealer.

"Load Fail"

  • The firmware on the USB flash memory cannot be found.
  • Download the latest firmware on the USB flash memory and try again.

"Login Error"

  • The connection to vTuner has failed.
    - Confirm the network connection and settings.
    - Select a different audio source and then select Internet Radio again.

"No Device"

  • No USB device is connected.
  • Connect the USB device to be played.

"No Disc"

  • No CD is inserted.
  • Insert the disc to be played.

"No Network Available"

  • This unit is not connected to the network.
  • Check the network connection.

"No Play"

  • The disc cannot be played back.
  • Insert the disc to be played.

"Not Measured"

  • Measuring the output signal has not been done yet.
  • Measure the output signal.

"Not Valid"

  • The function you have tried to use is not available with the current settings. Check the steps and settings.

"Operate via App"

  • Operate via Technics Music App.

"PGM Full"

  • The number of programmed tracks is more than 24.

"Please Wait"

  • This is displayed, for example, when this unit is turned to standby/on. (For up to approx. 1 minute and 30 seconds)
    The display time may vary depending on its condition.

"Reading"

  • The unit is checking the CD information. After this display has disappeared, start operating.

"Remote □" ("□" stands for a number.)

  • The remote control and this unit are using different codes.
    Change the code on the remote control.

"Remote Mode"

  • Basic playback control buttons on the touch panel/remote control are not available. (While playing back music stored on the DLNA server with this unit (DMR), etc.)
  • Use the connected device (smartphone, tablet, etc.) for basic playback control.
  • If you want to operate from the main unit or the remote control (playing back music stored on the DLNA server with this unit (DMP), etc.), please switch the input source again from the main unit or the remote control.

"Searching"

  • The unit is checking the DLNA server on the network.

"Unlocked"

  • "PC" is selected, but a PC is not connected. Check the connection with the PC.
  • The sampling frequency components, etc. of the audio signals are not input correctly.
    - About supported format, refer to "File format" (⇒ Operating Instructions)

"USB Over Current Error"

  • The iPhone/iPad/iPod or USB device is drawing too much power. Disconnect the iPhone/iPad/iPod or USB device and turn the unit to standby and on again.

"Wi-Fi Setup"

  • Select "On" and press [OK] to enter the network setting.
    - To exit the network setting, select "Off" and press [OK].

"Hub Device Not Supported/Not Supported/Device Not Recognized/USB Device Not Supported"

  • You have connected an iPhone/iPad/iPod or USB device that is not supported.
    - If the iPhone/iPad/iPod is compatible, turn it on and connect it correctly.
  • The format of the file on the iPhone/iPad/iPod or USB device is not supported.
    - About supported format, refer to "File format" (⇒ Operating Instructions)

About Network service

The service contents may be changed or discontinued at the discretion of respective service providers without notice. Panasonic will assume no responsibility whatsoever for any damage or loss resulting from change or discontinuation of the service.