No LEDs illuminated
• Is the POWER switched on?
• Is the correct mains voltage being used for your unit? If not, the fuse may blow, requiring the correct fuse to be refitted. (Click here to find the fuse rating for your unit.)

No output when using the MIC INPUT
• Is the POWER switched on?
• Is the MIC LED next to the SELECT switch illuminated?
• Is the LEVEL set correctly?
• For microphones that require phantom power, is the +48V switch engaged? (If you are unsure whether your microphone requires phantom power, check the user guide for your microphone.)

No output when using the LINE INPUT
• Is the POWER switched on?
• Is the LINE LED next to the SELECT switch illuminated?
• Is the LEVEL set correctly?

Output sounds DISTORTED
• Is the Input gain too high?
• Is the Compressor switched in, and the Makeup Gain set too high?
• Is the EQ switched in, and the gain set too high?
• Is the HARMONICS dial turned up?

The COMPRESSOR is not working
• Is the COMP IN switch engaged?
• Is the LEVEL set correctly? If set too low, the signal level may not be high enough to activate the compressor.
• Are the COMPRESSION controls set correctly? If set too low, the input level may not reach the threshold at which compression starts. (See manual for more info.)
• Is the LISTEN switch illuminated? This will result in monitoring of the compressor’s sidechain. (See manual for more info.)
• Is the BYPASS switch in the ‘COMP & EQ BYPASS’ section engaged? This deactivates all EQ and Dynamics.

The EQ section is not working
• Is the EQ IN switch engaged?
• Is the appropriate band’s frequency dial set to act on a frequency that is present in the signal?.
• Is the BYPASS switch in the ‘COMP & EQ BYPASS’ section engaged? This deactivates all EQ and Dynamics.

No word clock lock
• Is your external word clock source transmitting word clock?
• Is the sample frequency set to match that of the word clock-transmitting device? • Is an external word clock cable needed and, if so, is it connected? (See clocking regulations in the GENERIC SETUP.)

No output from the digital output
• Is the sample frequency set correctly?
• Does the receiving device accept AES format?
• Is the receiving device set to receive the correct resolution (24-bit)?
• Is the receiving device set to external sync? (See DIGITAL in GENERIC SETUP.)
• At 192kHz, is the receiving device a one- or two-wire system?