5) Troubleshooting
REFERENCE
11
NO POWER, NO INDICATORS
- Check the IEC cable is plugged in firmly. PSU may be in
protection mode, try turning the PSU OFF, wait 2 minutes then switch on again. Check the
fuse on the back panel. A blown fuse often looks black inside . Try replacing the fuse with
one of the same value and size. If it blows then prepare to send the unit back to the dealer or
factory for repair. The fuse is a protection device and it should blow if there is a problem.
LIGHTS BUT NO SOUND
- This typically indicates a cabling problem. Check to ensure the XLR
microphone cables you are using are not damaged. If the XLR and microphone preamp (and
the rest of the signal path) are known to be good, it may be the microphone.
LEVELS SEEM TO BE WRONG, NO BOTTOM
- Most likely one of two scenarios. One, a partially
broken cable. You would then be missing half the balanced signal and levels would be down
approximately -6dB. Second possibility, the signal's polarity has been reversed somewhere.
Try flipping the phase on your microphone preamp (if it has a phase switch), and see if that
helps. **Put on some headphones, close your eyes, and speak into the microphone from a
distance of about one foot. Your voice should be full and clear with a solid low-end. With the
phase reversed, this solidity goes away and your voice will sound like it is swimming all
around your head with no clearly defined center image.**
HUM
- This is most likely a ground loop. It is possible to use an XLR 3-pin to 2-pin adapter
with its ground separated or to remove the internal ground lift jumper on the PSU. See the
SERVICING section in this manual for this procedure.
BUZZ
- This is most likely a faulty ground somewhere in the chain. Make sure all the philips
screws holding the microphone body to the microphone base are tight. Older models might
have loose set-screws that hold and ground the connectors to the body system. Use a 1/16
hex key to tighten these set screws around the base of the microphone. It might also be the
tube making a bad noise, in that case please refer to the servicing section in this manual.
EXCESS NOISE, DISTORTION, SNAPS CRACKLES & POPS
- Most likely a tube please refer to
the SERVICING section in this manual.
