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When both MUTE IN and OVERRIDE IN logic are grounded,
the Override mode will take precedence (as supplied, the
MUTE IN takes precedence 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 button or privacy function (mute when necessary).
However, if the MUTE IN is intended to be used so that the talk-
er must unmute microphones to enable speech pickup (un-
mute when needed), this modification is needed. This re-
moves 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 micro-
phones do not activate for that talker.
Procedure:
Short jumper X1002.
CHANGING
MUTE IN
TO
INHIBIT
As supplied, a channel will mute when its MUTE IN terminal is
grounded. 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:
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 resistor values.
Off-Attenuation Level Resistor Value
10 dB 18 kΩ
13 dB
(default)
30 kΩ
20 dB 75 kΩ
30 dB 250 kΩ
1 dB open circuit
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 to-
gether so that all of them activate whenever one of them acti-
vates. 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 connecting PD1000, PD2000, and PD3000.
SHORTING OVERRIDE IN TO LOGIC GROUND INTERNALLY