DTM-7 - Troubleshooting

Troubleshooting

Before starting the procedure

Problems may be solved by simply turning the power on/off or disconnecting/connecting the power cord, which is easier than working on the connection, setting and operating procedure. Try the simple measures on both the unit and the connected device. If the problem is that the video or audio is not output or the HDMI linked operation does not work, disconnecting/connecting the HDMI cable may solve it. Turn off the device connected to this unit, then disconnect and reconnect the cable. When reconnecting, be careful not to wind the HDMI cable since if wound the HDMI cable may not fit well.

• The AV receiver contains a microPC for signal processing and control functions. In very rare situations, severe interference, noise from an external source, or static electricity may cause it to lockup. In the unlikely event that this happens, unplug the power cord from the wall outlet, wait at least 5 seconds, and then plug it back in.
• We are not responsible for reparations for damages (such as CD rental fees) due to unsuccessful recordings caused by the unit’s malfunction. Before you record important data, make sure that the material will be recorded correctly.

If operation becomes unstable

Try restarting the unit

The issue may be fixed by restarting this unit. After switching this unit to standby, press and hold On/
Standby on this unit for 5 or more seconds to restart the unit. (The settings in the unit are maintained.) If the issue is not fixed by restarting, try unplugging the power cords of the unit and connected devices, and then plugging them in again. Resetting the unit (this resets the unit settings to the default) If restarting the unit doesn't fix the problem, resetting the unit to the status at the time of shipment may solve the
problem. Your settings will also be initialized when you reset, so note down your settings before doing the following.

1. While holding down Tuning Mode on the main unit, press On/Standby.
2. The unit switches to standby and the settings are reset.

Power

Cannot turn on the unit

• Make sure that the power cord is properly plugged into the wall outlet.
• Unplug the power cord from the wall outlet, wait 5 seconds or more, then plug it in again.

The unit turns off unexpectedly

• The unit automatically switches to standby when the "5. Hardware" - "Power Management" - "Auto Standby" setting in the Setup menu functions.
• The protective circuit function may have been activated. If this has occurred, "AMP Diag Mode" appears on the display when the unit is turned on again, and the unit enters diagnostic mode. If the results of the diagnosis is that there is no problem, the "AMP Diag Mode" display disappears and you can use the unit normally again. If "CHECK SP WIRE" appears on the display, the speaker cables may be short-circuited. Make sure bare speaker wires are not touching each other or the back panel of the unit, then turn the unit on again. If "NG" is displayed, immediately unplug the power cord from the wall outlet and contact your dealer.
• The protective circuit function may have been activated because the temperature of the unit rose abnormally. If this happens, then the power will continue to turn off after you have turned the unit on again. Make sure the unit has plenty of space for ventilation around it, wait for the unit to cool down sufficiently, and then try turning it on again.

WARNING: If smoke, smell or abnormal noise is produced by the unit, unplug the power cord from the wall outlet immediately and contact the dealer or customer support.

Audio

• Confirm that the connection between the output jack on the device and the input jack on this unit is correct.
• Make sure that none of the connecting cables are bent, twisted, or damaged.
• If the MUTE indicator on the display flashes, press Muting on the remote controller to cancel muting.
• While headphones are connected to the Phones jack, no sound is output from the speakers.

Check the following if the above does not fix the problem:

There is no sound from the TV

• Change the input selector on this unit to the position of the terminal to which the TV is connected.
• When connected to a TV that supports the ARC feature with an HDMI cable, only PCM audio input is supported from the TV to this unit. Make sure that your TV audio output setting is set to PCM.
• If the TV doesn't support the ARC function, along with connection by HDMI, connect the TV and this unit using a digital optical cable, digital coaxial cable, or analog audio cable.

No sound from a connected player

• Change the input selector on this unit to the position of the terminal to which the player is connected.
• Check the digital audio output setting on the connected component. On some game consoles, such as those that support DVD, the default setting is off.
• With some DVD-Video discs, you need to select an audio output format from a menu.

A speaker produces no sound

• Make sure that the polarity of the speaker cables (+/-) is correct, and that no bare wires are in contact with the metal part of speaker terminals.
• Make sure that the speaker cables have not shorted.
• Make sure the speakers are connected correctly.

The subwoofer produces no sound

If the setting of the front speakers is "Full Band" and during 2ch input such as from the TV or music, the low range elements will be output from the front speakers rather than from the subwoofer. If you would rather output from the subwoofer, make one of the following settings.

1. Change the front speakers settings to a setting other than "Full Band" for the crossover frequency value. The range below the frequency you specify will be output from the subwoofer rather than the front speakers. We do not recommend changing this if your front speakers have good low range reproduction capabilities.
2. Change "Double Bass" to "On". The low range elements will be output from both the front speakers and the subwoofer. This may mean that there is too much bass. Do not change if this happens, or
   choose option 1.
   - Refer to "2. Speaker" - "Crossover" in the Setup menu for details.
   - When you play source material that contains no information in the LFE channel, the subwoofer produces no sound.

Noise can be heard

• Using cable ties to bundle analog audio cables, power cords, speaker cables, etc. may degrade the audio performance, Do not bundle cords.
• An audio cable may be picking up interference. Try repositioning your cables.

The beginning of audio received by an HDMI IN cannot be heard

• Since it takes longer to identify the format of an HDMI signal than it does for other digital audio signals, audio output may not start immediately.

Sound suddenly reduces

• When the temperature inside the unit exceeds a certain temperature for extended periods, the volume may be reduced automatically to protect the circuits.

Video

• Confirm that the connection between the output jack on the device and the input jack on this unit is correct.
• Make sure that none of the connecting cables are bent, twisted, or damaged.
• There may be interference from the power cords or other connection cables to this unit if the picture on the TV is poor. Try separating the TV antenna cable and other cables of the unit.
• Check the screen input on the monitor, such as the TV.

Check the following if the above does not fix the problem:

There is no video

• Change the input selector on this unit to the position of the terminal to which the player is connected.

There is no picture from a source connected to an HDMI IN terminal

• To display video from the connected player on the TV screen while the unit is in standby, you need to enable "5. Hardware"- "HDMI" - "HDMI Standby Through" in the Setup menu. Standby Through.
• Check if "Resolution Error" is displayed on the main unit display when video input via HDMI IN jack is not displayed. In this case, the TV does not support the resolution of the video input from the player. Change the setting on the player.
• Reliable operation with an HDMI-to-DVI adapter is not guaranteed. In addition, video signals from a PC are not supported.

Images flicker

• It is possible that the resolution of the player is not compatible with the TV's resolution. If you have
  connected the player to this unit with an HDMI cable, try changing the output resolution on the player. There also may be an improvement if you change the screen mode on the TV.

Video and audio are out of sync

• Video may be delayed relative to audio depending on the settings and connections with your TV. To adjust, press Audio on the remote controller, and adjust in "Other" - "A/V Sync". 

Linked operation

There is no linked operation with CEC compliant devices, such as a TV.

• The "5. Hardware" - "HDMI" - "HDMI CEC" setting in the Setup menu needs to be set to "On".
• It is also necessary to set HDMI linking on the CEC compliant device. Check the instruction manual.

AM/FM broadcasting

Radio reception is poor or there is a lot of noise.

• Re-check the antenna connection.
• Separate the antenna from speaker cables and the power cord.
• Move the unit away from your TV or PC.
• Passing cars and airplanes can cause interference.
• Concrete walls weaken radio signals.
• Listen to the station in mono.
• When listening to an AM station, operating the remote controller may cause noise.
• FM reception may become clearer if you use the antenna jack on the wall used for the TV.

The BLUETOOTH feature

• Try plugging/unplugging the power of the unit and try turning on/off the BLUETOOTH wireless technology enabled device. Restarting the BLUETOOTH wireless technology enabled device may be effective.
• The BLUETOOTH wireless technology enabled devices must support the A2DP profile.
• Radio wave interference may occur in the vicinity of components, such as microwave ovens or cordless phones, which use radio waves in the 2.4 GHz range. This interference may render this unit unusable.
• If there is a metallic object near the unit, BLUETOOTH connection may not be possible as the metal can effect on the radio waves.

Check the following if the above does not fix the problem:

Cannot connect with this unit

• Check that the BLUETOOTH function of the BLUETOOTH wireless technology enabled device is enabled.

Music playback is unavailable on the unit even after successful BLUETOOTH connection

• When the audio volume of your BLUETOOTH wireless technology enabled device is set low, the playback of audio may be unavailable. Turn up the volume on the BLUETOOTH wireless technology enabled device.
• Some BLUETOOTH wireless technology enabled devices may be equipped with a Send/Receive selector switch. Select Send mode.
• Depending on the characteristics or specifications of your BLUETOOTH wireless technology enabled device, playback on this unit may not be possible.

Sound is interrupted

• There may be a problem with the BLUETOOTH wireless technology enabled device. Check the information on the internet.

The audio quality is poor after connection with a BLUETOOTH wireless technology enabled device

• Reception is poor. Move the BLUETOOTH wireless technology enabled device closer to the unit or remove any obstacle between the BLUETOOTH wireless technology enabled device and this unit.

Network Functions

• If you cannot select a network service, it will become selectable when the network function is started. It may take about a minute to start up.
• When NET is blinking, the AV receiver is not properly connected to the home network.
• Try plugging/unplugging the power supply of this unit and the router, and try rebooting the router.
• If the desired wireless LAN router is not in the access point list, it may be set to hide SSID or the ANY connection may be off. Change the setting and try again.

Check the following if the above does not fix the problem:

Cannot access the Internet radio

• Certain network service or contents available through the unit may not be accessible in case the service provider terminates its service.
• Make sure that your modem and router are properly connected, and make sure they are both turned on.
• Make sure that the LAN side port on the router is properly connected to the AV receiver.
• Make sure that connecting to Internet from other components is possible. If connecting is not possible, turn off all components connected to the network, wait for a while, and then turn on the components again.
• If a specific radio station is unavailable for listening, make sure the registered URL is correct, or whether the format distributed from the radio station is supported by the AV receiver.
• Depending on ISP, setting the proxy server is necessary.
• Make sure that the router and/or modem you are using is supported by your ISP.

Cannot access the network server

• This unit needs to be connected to the same router as the network server.
• This unit is compatible with Windows Media® Player 11 or 12 network servers or NAS that are compatible with home network functionality.
• You may need to make some settings on Windows Media® Player.
• When using a PC, only music files registered in the Windows Media® Player library can be played. 

Playback stops while listening to music files on the network server

• Make sure the network server is compatible with this unit.
• When the PC is serving as the network server, try quitting any application software other than the server software (Windows Media® Player 12 etc.).
• If the PC is downloading or copying large files, the playback may be interrupted.

Wireless LAN Network

• Try plugging/unplugging the power supply of wireless LAN router and the unit, check the wireless LAN router power-on status, and try reboot of the wireless LAN router.

Check the following if the above does not fix the problem:

Cannot access wireless LAN network

• The wireless LAN router setting may be switched to Manual. Return the setting to Auto.
• Try the manual set-up. The connection may succeed.
• When the wireless LAN router setting is at stealth mode (mode to hide the SSID key) or when ANY connection is off, the SSID is not displayed. Change the setting and try again.
• Check that the setting of SSID and encryption (WEP, etc.) is correct. Make sure the network settings of the unit is properly set.
• Connection to an SSID that includes multi-byte characters is not supported. Name the SSID of the
  wireless LAN router using single-byte alphanumeric characters only and try again.

Connected to an SSID different to the SSID selected

• Some wireless LAN routers allow you to set multiple SSIDs for one unit. If you use the automatic setting button on such a router, you may end up connecting with a different SSID from the SSID you wanted to connect to. Use the connection method requiring you to enter a password if this happens.

Playback is interrupted and communication does not work

• You may not receive radio waves due to bad radio wave conditions. Shorten the distance from the wireless LAN router or remove obstacles to improve visibility, and try again. Place the unit away from microwave ovens or other access points. It is recommended to place the wireless LAN router and the unit in the same room.
• If there is a metallic object near the unit, wireless LAN connection may not be possible as the metal can effect on the radio wave.
• When other wireless LAN devices are used near the unit, several issues such as interrupted playback and communication may occur. You can avoid these issues by changing the channel of your wireless LAN router. For instructions on changing channels, see the instruction manual provided with your wireless LAN router.
• There may not be enough bandwidth available in the band for wireless LAN. Connect using an Ethernet cable.

Multi Zone feature

• Settings are required in Initial Setup, "3. Multi Zone Setup" to use the multi-zone feature.
• DSD audio signals are not output to ZONE 2 with the "NET" input selector.

Check the following if the above does not fix the problem:

Cannot ZONE output audio of external AV component

• When outputting the audio of an external AV component to ZONE 2, connect using an analog audio cable.

Remote Controller

• Make sure that the batteries are installed with the correct polarity.
• Install new batteries. Do not mix different types of batteries, or old and new batteries.
• Make sure that the unit is not subjected to direct sunshine or inverter-type fluorescent lights. Relocate if necessary.
• If the unit is installed in a rack or cabinet with colored glass doors or if the doors are closed, the remote controller may not work reliably.
• After operating the Multi-zone function, the remote controller may have switched to the mode for controlling ZONE 2. Press Remote Mode Main to switch to the mode to control the main room.

Display

The display doesn't light

• The display may go dim while the Dimmer is working. Press Dimmer to change the brightness level of the display.

Others

Strange noises can be heard from the unit

• If you have connected another unit to the same wall outlet as this unit, this noise may be an effect from the other unit. If the symptoms improve by unplugging the power cord of the other unit, use different wall outlets for this unit and the other unit.