Troubleshooting - AKG WMS 40 User Manual

AKG WMS MULTICHANNEL TECHNOLOGY
HOW MULTICHANNEL TECHNOLOGY WORKS
Troubleshooting hardwire and wireless microphones
1. Problem: no sound (microphone does not function)
Possible cause Hardwire mic
Power supply Check whether ...
• phantom power on mixer is on
• battery is o.k. (C 1000 S only)
Cable/radio link Check whether ...
• both cable ends are connected
Signal path Check whether ...
• mic channel is open, mute and
preattenuation switches are out, and
gain is set correctly on mixer
2. Problem: poor audio
Possible cause Hardwire mic
Weak signal Check whether ...
• corroded contacts, dry solder joints
cause excessive attenuation
Hum, whistle, or Check whether ...
other noise • stray magnetic fields induce hum in
cables (crosstalk from parallel
lines), or ground loops, monitors,
fluorescent lighting, or transformers
degrade the signal
3. Problem: signal quality deteriorates on movement
Possible cause Hardwire mic
Dropout or Check whether ...
deep fade • cable was accidentally disconnected
Extremely Check whether ...
inconsistent • any contacts are loose
signal quality • there are any dry solder joints
• microphone and/or cable is
mechanically damaged
34
T
ROUBLESHOOTING
Wireless system
Check whether ...
• power to receiver and transmitter is
on and batteries are o.k.
Check whether ...
• transmitter (mic) and receiver
are set to same frequency
Check whether ...
• transmitter signal reaches receiver
Wireless system
Check whether ...
• transmitter is out of range
• signal is attenuated by objects
or people
Check whether ...
• there is intermodulation or
interference (spectrum analyzer)
• signal is jammed by unwanted high-
power transmitters (TV/radio station)
• there are any sources of interferen-
ces (computers, lighting, switching
power supplies)
• RF output causes is too high/low
Wireless system
Check whether ...
• transmitter is out of range
• signal is attenuated by objects
or people
• there is a permanent line of sight
between transmitter and receiving
antennas
Check whether ...
• transmitter is out of range
• signal is attenuated by objects
or people
• there are any unwanted local
transmitters (e.g. intercom)
www.akg.com
H
INTS
Remedy (hardwire mic)
> Switch phantom power on or replace
battery
> Connect cable
> Open mic channel, set gain to
drive input correctly
Remedy (hardwire mic)
> Clean contacts (use contact spray)
> Change cable routing
> Eliminate interference sources
> Keep away from RF sources
Remedy (hardwire mic)
> Fix cable strain relief
> Repair solder joints and/or equip-
ment
Remedy (wireless system)
> Switch power to receiver and
transmitter on or replace batteries
> Set same frequency on transmitter
and receiver
> Open mic channel, set gain to drive
input correctly, set receiver squelch
threshold to minimum
Remedy (wireless system)
> Reduce distance between
transmitter and receiver
> Reposition transmitter/receiver
(especially antennas)
> Use active (directional) antennas
> Use booster(s)
> Select other frequencies
> Switch off unwanted transmitter
(if possible) or increase distance
from interference source
> Keep away from interference sources
> Reduce RF output
> Keep transmitter at least 2 feet
(1/2 m) away from metal fabric
and loose coins
Remedy (wireless system)
> Reposition transmitter/receiver
(especially antennas)
> Use active (directional) antennas
> Switch off unwanted transmitter
or increase distance from source
of interference
> Select clean frequencies
> Reposition receiving antennas
> Use active (directional) antennas
> Use booster(s)