17
MUTE IN PRECEDENCE TO OVERRIDE IN PRECEDENCE
When both MUTE IN and OVERRIDE IN logic are grounded, the Over-
ride mode will take precedence (as supplied, the MUTE IN takes prece-
dence over OVERRIDE IN).
Procedure:
1. Short jumper X1005.
2. Remove resistor R1087.
DEAD ZONE ON MUTE IN DEFEAT
As supplied, MUTE IN is intended for use as a momentary cough but-
ton or privacy function (mute when necessary). However, if the MUTE IN
is intended to be used so that the talker must unmute microphones to en-
able speech pickup (unmute when needed), this modification is needed.
This removes the muted channel from the MaxBus which eliminates
“dead zones.” A dead zone is an area in which a microphone picks up a
talker through a muted microphone and other microphones do not acti-
vate for that talker.
Procedure:
1. Short jumper X1002.
CHANGING MUTE IN TO INHIBIT
As supplied, a channel will mute when its MUTE IN terminal is ground-
ed. The mute function for each channel can be modified so that a logic
“low” at the MUTE IN terminal prevents that channel from gating on if it is
off, but allows it to remain on if it is already on. Use this modification to
enable Filibuster Mode.
IMPORTANT: To prevent high-frequency oscillation, never connect
the GATE OUT to the MUTE IN of the same channel unless the
“Inhibit” modification has been made.
Procedure:
1. Short jumper X1007.
CHANGING OVERRIDE IN TO MUTE IN (FILIBUSTER MODE)
This modification should only be performed with the Change MUTE IN
to Inhibit modification described above. This is only necessary if the Mute
function is desired along with Filibuster Mode.
Procedure:
1. Short jumper X1006.
2. Remove resistors R1087 and R1082.
CHANGING THE OFF-ATTENUATION LEVEL
This procedure changes the off-attenuation level from -13 dB (as
supplied). Refer to the following table for attenuation levels and resis-
tor values.
NOTE: As more Input channels are added to the system, the
off-attenuation increases slightly.
Procedure:
1. Remove resistor R9178.
2.
Install new resistor
at jumper points R9177.
GROUP GATING
With this modification, several channels can be grouped together so
that all of them activate whenever one of them activates. This is useful
for miking choirs.
Procedure:
1. Locate pad PD1000.
2. Solder a wire from PD1000 to the other channels in the group.
For example, to gate channels 1-3 as a group, solder a wire con-
necting PD1000, PD2000, and PD3000.
SHORTING OVERRIDE IN TO LOGIC GROUND INTERNALLY
This modification is equivalent to shorting one of the channel OVER-
RIDE IN to the LOGIC GROUND pin via the high density DB-15 logic con-
nector. With this modification, a channel is always on.
Procedure:
1. Short jumper X1003.
Off-Attenuation Level Resistor Value
10 dB 18 kΩ
13 dB
(default)
30 kΩ
20 dB 75 kΩ
30 dB 250 kΩ
∞ dB open circuit
To Next Page
Loading...
