Specifications

TROUBLESHOOTING
To Diagnose or Correct
Make indicated correction.
Listen to headphones plugged into the AMS front-panel Phones jack.
To check microphone: replace suspect microphone with another. If
there is sound, replace microphone cartridge and PC board
assemblies, or return the unit to the Shure Service Department for
repair; if there is still no sound, check cable.
To check cable: replace suspect cable with another. If there is
sound, repair or discard defective cable; if there is still no sound,
check input module.
To check input module: connect microphone and cable to another
channel and follow initial setup procedure. If there is sound, replace or
repair defective input module; consult Shure Service Department.
If there is sound on headphones but no sound from system, check
other components and cables.
If there is no sound on headphones, consult Shure Service
Depart-
ment.
If there is a reflective surface near microphone, and neither micro-
phone nor surface can be moved, cover surface with a
sound-
absorptive material at least 100 mm [4 in.] thick. If talker is on edge
of acceptance angle, move microphone or talker. If loud, steady room
noise [typically from air-handling equipment] swamps out quiet
speech, reduce room noise to reasonable conference levels or reduce
talker-to-microphone distance. If none of above, check microphone,
cable, channel, and system as in NO SOUND section. Check
teleconference equipment for malfunction.
Check that red Overload LED is not on: if on, turn down Channel or
Master control until LED goes out. If overload LED is not on, check
whether one or all microphones sound distorted. If only one is
distorted, check microphone, cable, and channel as in NO SOUND
section. If all microphones are distorted, remove AMS mixer from
system, and connect undistorted signal source to system inputs. If
final sound is still distorted, check system components and recording
level. If final sound is
not distorted, consult Shure Service Depart-
ment.
Move source or microphone if possible.
Repair or replace cable. If microphone still gates on, check micro-
phone and channel as in NO SOUND section.
Make sure microphone cable shield and 3-pin connector shells are
not connected to earth or grounded metallic objects. Shield ground
connection should only be made at AMS mixer input connectors.
15
Symptom
No sound
Erratic micro-
phone gating
Distorted sound
Micmphone gates
on for unintended
sound
Excessive hum
from one or more
microphones
[proper gating
"
may be affected]
Probable Cause
Channel control or Master
control turned too far down;
microphone not connected; mix-
er not connected to power
source; Power switch not on.
Defective microphone, cable,
channel input module
Defective power amp, tape deck,
speakers, etc.
Defective AMS mixer
Reflective surf ace near
microphone (closer than 200 to
300 mm
- 8 to 1 2 in.] not in-
cluding table top for surface-
mount models); talker positioned
on edge of microphone accep-
tance angle; excessive steady
room noise; defective
microphone, cable, or input
chan-
nel.
Master or Channel control set
too high; defective microphone,
cable, or channel; defective
amplifier, recorder or speaker
Source is within
1 20° accep-
tance angle
If source is outside
1 20° accep-
tance angle: microphone cable
defective or wired out of phase;
input module defective
Microphone input ground loop