No LEDs illuminate

• 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 LINE switch on the front panel switched out?
• Is the INST switch on the front panel switched out? (Channels 1 & 2 only.)
• 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 switch on the front panel switched in?
• Is the INST switch on the front panel switched out? (Channels 1 & 2 only.)
• Is the LEVEL set correctly?

No output when using the INSTRUMENT INPUT (Channels 1 & 2 only)

• Is the power switched on?
• Is the INST switch on the front panel switched in?
• Is the LEVEL set correctly?

The DYNAMICS control seem to have no effect

• Is the LEVEL set correctly? If set too low, the signal level may not be high enough to activate the compressor.
• Is the DYNAMICS control set correctly? If set too low, the input level may not reach the threshold at which compression starts. (See user manual)

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)
• Is the Ext switch on the rear panel engaged?

No output from the digital output option

• Is the sample frequency set correctly?
• Is the receiving device set to receive the correct resolution (16-, 20- or 24-bit)?
• Is the receiving device set to external sync? (See DIGITAL in GENERIC SETUP)
• For AES/SPDIF, is the correct digital output lead being used (when using an XLR lead and connecting to a device which requires a consumer format via a dubious adapter, the signal format will not change from Pro to Consumer)