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X.200
Digital X Bus
Appendix A: Service Information
Bad Output
• Is the associated level control (if any) turned
up?
• Is the output source correctly assigned in the
Card Setup window?
• If it’s a stereo pair, try switching them around.
For example, if a left output is presumed dead,
switch the left and right cords at the mixer end.
If the problem stays on the left side, it’s not the
mixer.
Bad Sound
• Is the input connector plugged completely into
the jack?
• Is it loud and distorted? Make sure the input
GAIN control for the input is set correctly.
Reduce the signal level on the input source if
possible.
• If possible, listen to the signal with head-
phones plugged into the input source device. If
it sounds bad there, it’s not the Digital X Bus
causing the problem.
Noise/Hum
• Turn down each channel, one by one. If the
noise disappears, it’s coming from whatever is
plugged into that channel.
• Check the signal cables between the input
sources and the Digital X Bus. Disconnect them
one by one. When the noise goes away, you’ll
know which input source is causing the prob-
lem.
• Sometimes it helps to plug all the audio equip-
ment into the same AC circuit so they share a
common ground.
Warranty Service
Details concerning Warranty Service are spelled out
in the Warranty section on page xx.
If you think your Digital X Bus has a problem,
please do everything you can to confi rm it before
calling for service. Doing so might save you from
the deprivation of your Digital X Bus and the associ-
ated suffering.
These may sound obvious to you, but here are some
things you can check. Read on.
Troubleshooting
No Power
• Our favorite question: Is it plugged in?
• Make sure the power cord is securely seated in
the IEC socket and plugged all the way into the
AC outlet.
• Make sure the AC outlet is live (check with a
tester or lamp).
• Is the POWER switch on? Make sure the
POWER switch on the rear panel is in the ON
position (up).
Bad Channel
• Is the MUTE button pushed in?
• Is the input GAIN control for the channel turned
up?
• Is the fader turned up?
• Is the Input Source correctly assigned in the
ASSIGN window?
• Is the signal source turned up? Make sure the
signal level from the selected input source is
high enough to light up some of the INPUT
meter LEDs next to the channel’s fader.
• Is the channel assigned to a bus or output?
• Try the same source signal in another channel,
set up exactly like the suspect channel.