Is the power cord properly connected? Connect the power cord to a power outlet then turn the POWER button on.

The circuitry generating the [ECHO], [UP ECHO], [SPIRAL], [REVERB], [ROLL], [SLIP ROLL] and [REV ROLL] echoes is positioned after the effect circuitry, so the effect sounds cannot be monitored. This post-effect design is meant to ensure natural reverberations when the sound is cut with the channel fader.
This is not a malfunction.

Are the CROSS FADER ASSIGN (A, THRU, B) selector switches properly set? Set the [CROSS FADER ASSIGN (A, THRU, B)] selector switches for the respective channels properly.

There are three possible causes.

1. Is [FADER START] set to [OFF]? At the [USER SETUP] screen, set [FADER START] to [ON]. Also set the [FADER START] button on the control panel to [ON]. For details, see “Setting preferences” in the operating instructions.
2. Is the DJ player properly connected to the [CONTROL] terminal? Properly connect the DJ player to the [CONTROL] terminal using a control cable. For details, see “Connecting input terminals” in the operating instructions.
3. Are the audio cables properly connected? Connect the DJM-850’s audio input terminals to the DJ player’s audio output terminals using audio cables. For details, see “Connecting input terminals” in the operating instructions.

Is the [1, 2, 3, 4, MIC, CF.A, CF.B, MASTER] selector switch properly set? Turn the [1, 2, 3, 4, MIC, CF.A, CF.B, MASTER] selector switch and set it to the channel to which you want to apply the effect.

There are two possible causes.

1. Have you pressed a [SOUND COLOR FX] button and selected an effect? Press a [SOUND COLOR FX] button and select the effect you want to apply.
2. Is the [COLOR] control set to an appropriate position? Turn the [COLOR] control clockwise or counterclockwise.

There are three possible causes.

1. Have you pressed a [SOUND COLOR FX] button and selected an effect? Press the [SOUND COLOR FX] button and select the effect you want to apply.
2. Is the [SOUND COLOR FX] [BEAT] button set to [ON]? Press the [SOUND COLOR FX] [BEAT] button to set it to [ON].
3. Is the [COLOR] control set to an appropriate position? Turn the [COLOR] control clockwise or counterclockwise.

Also, depending on the track being input, the [BEAT COLOR FX] effect may be hard to distinguish.

There are two possible causes.

1. Is the [BEAT EFFECTS] – [ON/OFF] button set to [ON]? Press the [BEAT EFFECTS] – [ON/OFF] button and set [SND/RTN] to [ON].
2. Is the external effecter properly connected to the [SEND] and [RETURN] terminals? Connect the external effecter to the [SEND] and [RETURN] terminals. For details, see "Connecting input terminals" in the operating instructions.

Is the external effecter's audio output level set appropriately? Adjust the external effecter's audio output level.

There are threetwo possible causes.

1. Is the audio input level too high? Or is it too low? Adjust the [TRIM] control so that the channel level indicator lights up to about [0 dB] when the input sound is at its peak level.
2. For some tracks the tempo (BPM) cannot be measured. In this case, use the [TAP] button to input the tempo manually.

The values may differ slightly due to different methods used for measuring the BPM. This is not a malfunction.

There are six possible causes.

1. Is the [CD/LINE, PHONO, LINE, USB */*] selector switch set to the proper position?
Turn the [CD/LINE, PHONO, LINE, USB */*] selector switch and set it to the channel's input source.
2. Are connection cables properly connected? Connect the connection cables properly. For details, see "Connecting input terminals" and "Connecting output terminals" in the operating instructions.
3. Is [MASTER LEVEL] set to the proper position? Adjust [MASTER LEVEL] so that the master level indicator lights up to the orange indicator at the peak level.
4. Is [TRIM] set to the proper position? Adjust [TRIM] so that the channel level indicator lights up to the orange indicator at the peak level.
5. Are terminals and plugs dirty? Wipe any dirt off terminals and plugs before connecting.
6. Is [MASTER ATT.] set at for example [-6 dB]? Switch [MASTER ATT.] at the [CLUB SETUP] screen. For details, see "Changing the settings" in the operating instructions.

The talkover function can sometimes be activated erroneously due to the influence of static electricity, etc. If you do not want to use the talkover function, turn it off.

Does the digital sound output's sampling frequency (fs) match the specifications of the connected device? At the [CLUB SETUP] screen, set [Digital Master Output Sampling Rate] according to the specifications of the connected device. For details, see "Changing the settings" in the operating instructions.

There are two possible causes.

1. Is [MASTER LEVEL] set to the proper position? Adjust [MASTER LEVEL] so that the master level indicator lights up to the orange indicator at the peak level.
2. Is [TRIM] set to the proper position? Adjust [TRIM] so that the channel level indicator lights up to the orange indicator at the peak level.

If the sound is distorted even after the input/output level has been adjusted, the level may exceed the power amplifier's maximum allowable input level. Turn the level down to an appropriate level using [MASTER ATT] on the rear panel. The level can be attenuated by 50% at -6 dB, by 70% at -3 dB. This setting does not affect the master level indicator.For details, see "Changing the settings" in the operating instructions.

There are two possible causes.

1. Is an analog player with an internal phono equalizer connected? When using an analog player with an internal phono equalizer, connect it to the [CD/LINE] or [LINE] terminals. For details, see "Connecting input terminals" in the operating instructions. If the analog player with internal phono equalizer is equipped with a PHONO/LINE selector switch, switch it to PHONO.
2. Is a computer sound card (audio interface) connected between the analog player and this unit? If the computer sound card's output has a line level, connect to the [CD/LINE] or [LINE] terminals. For details, see "Connecting input terminals" in the operating instructions. If the analog player is equipped with a PHONO/LINE selector switch, switch it to PHONO.

There are two possible causes.

1. Is the MIDI sequencer’s sync mode set to Slave? Set the MIDI sequencer’s sync mode to Slave.
2. Does your MIDI sequencer support MIDI timing clocks? Synchronizing is not possible if the MIDI sequencer does not support MIDI timing clocks.

1. The dedicated driver software must be installed on the computer beforehand. For details, see "Installing the driver software" in the operating instructions.
2. This unit and the computer must be connected properly. For details, see "Connecting this unit and computer" in the operating instructions.
If the computer can still not be connected properly, quit the DJ application, disconnect the USB cable, then reconnect the USB cable and relaunch the DJ software.

*This unit and the dedicated driver software only support Hi-Speed USB. Check that your computer, the USB port and the USB cable support Hi-Speed USB.

When this unit is connected to a computer (Windows) for the first time or when it is connected to a different USB port on the computer, the message "Installing device driver software" may appear on the computer's screen. Wait awhile as such until the message "Device prepared for use" appears.

-[Connect to Windows Update to search for hardware] may appear during installation. If so, select [No, do not connect now], then click [Next] to continue installation.
-[Select the installation method] may appear during installation. If so, select [Install software automatically (recommended)], then click [Next] to continue installation.
-The [Windows Security] screen may appear during installation. If so, click [Install driver software] to continue installation.

1. To output the sound from the computer to this unit, the dedicated driver software must be installed on the computer beforehand. For details, see "Installing the driver software" in the operating instructions.
2. This unit and the computer must be connected properly. For details, see "Connecting this unit and computer" in the operating instructions.
If the computer can still not be connected properly, quit the DJ application, disconnect the USB cable, then reconnect the USB cable and relaunch the DJ software.
3. The audio data to be output to the computer must be set using the Settings Utility. For details, see "About the setting utility software" in the operating instructions.
4. This unit must be selected in the DJ software's audio output device settings. For detailed instructions on setting, see your DJ software's operating instructions.
5. This unit's [CD/LINE, PHONO, LINE, USB /] selector switch must be set to the proper position. Set the [CD/LINE, PHONO, LINE, USB /] selector switch to the [USB /] position.

*This unit and the dedicated driver software only support Hi-Speed USB. Check that your computer, the USB port and the USB cable support Hi-Speed USB.

1. Connect the device to be controlled by MIDI signals and this unit using a MIDI cable or USB cable.
2. Set this unit's MIDI switch (ON/OFF button) to "ON".
3. For other MIDI setting procedures, see the operating instructions of your MIDI device.

This unit operates when the computer restarts from the sleep or standby mode, but your DJ software may not. If not, quit the DJ software, disconnect the USB cable, then reconnect the USB cable and relaunch the DJ software.

At [Control Panel], check that the account type at [User Account] is set to [Computer Administrator]. If not, installation is not possible.

Installation is possible by inputting the administrator's name and password even if the account type is not [Administrator].

There are six possible causes.

1. Sound skipping can be decreased by adjusting the buffer size.
Windows
When using ASIO driver, make the adjustment at the ASIO tab in the setting utility.
When using Direct Sound, make the adjustment from the DJ software.
Mac OS
Make the adjustment from the DJ software.
2. When using a laptop computer, the computer's performance may be intentionally reduced through the power-saving functions. Use the computer not on the battery but with the AC adapter and cancel all power-saving settings. Also cancel the screensaver function.
3. On Windows Vista, Windows 7, disable "Aero" setting if it's been active.
4. The sound may also skip if the CPU usage rate is high. Other applications being used simultaneously (including resident programs) could also affect performance. Check the recommended usage environment for your application.
5. Computer's internal devices or external devices connetced to may caouse sound skipping. In that case, disable all devices not in use.
6. Some application running on the back ground may cause this problem. If so, shut the other application down.

*Customers using Native Instruments Traktor 2, please see Native Instrument support page.

[Windows XP]
http://www.native-instruments.com/en/support/knowledge-base/show/300/windows-xp-tuning-tips-for-audio-processing/
[Windows Vista]
http://www.native-instruments.com/en/support/knowledge-base/show/314/windows-vista-tuning-tips-for-audio-processing/
[Windows 7, 8]
http://www.native-instruments.com/en/support/knowledge-base/show/3671/windows-78-tuning-tips-for-audio-processing/
[Mac OS X]
http://www.native-instruments.com/en/support/knowledge-base/show/901/mac-os-x/

Driver software Ver. 1.0.0 does not support Mac OS X 10.4 or earlier. The latest driver software can be acquired at the Pioneer DJ support page.

Change the USB Output Level setting in the Settings Utility.
When Timecode is selected at Mixer Audio Output, however, the USB Output Level value is fixed and does not change.

Is the [OFF, ON, TALK OVER] switch set to [TALK OVER] and a microphone connected to this unit turned on and placed near a speaker?
When the microphone catches the sound of the speaker, the talkover function is activated and the output sound may seem low unexpectedly. Either turn the talkover function or microphone off, or move the microphone away from the speaker.

If the LED is constantly lit:
This means the auto standby function is activated. Press the SETUP (WAKE UP) button to reset. For details, see “About the auto standby function” in the operating instructions.

If the LED is flashing in 500 ms cycles and “Exxx” is displayed on the main unit display:
Updating was not completed normally. Update again.

Updating has failed.
Connect the DJM-850 and computer by USB cable, then follow the instructions in the updating guide to update again.

If audio is not output or you cannot control rekordbox when using Windows, please see here to solve the problems.