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INSERTING AN INPUT LINE PAD
To insert a 40 dB line pad for a given microphone input, remove
the resistors specified in the following table.
Channel Remove Resistor
1 R1005, R1006
2 R2005, R2006
3 R3005, R3006
4 R4005, R4006
DISABLING THE MASTER LEVEL CONTROL
The Master gain control can be disabled to prevent tampering.
Refer to the following table for gain levels and resistor values.
Master Section Gain Resistance
-6 dB 5.1 kΩ
0 10 kΩ
6 dB 20 kΩ
Procedure:
1. Remove resistor R9203.
2. Install new resistor at jumper R9173.
CHANGING THE LIMITER THRESHOLD
To change the limiter threshold from the preset value of +16
dBu, modify the circuitry according to the following table.
CHANGE LIMITER THRESHOLD
Limiter Threshold
(dBu)
Limiter
DIP switch
X9003 R9149 R9142
0 On –– Remove 20k
+4 On Short –– ––
+8 Off Short –– ––
+12 On –– Remove 110k
+16
(default)
Οn –– –– ––
+20 On –– Remove 300k
+24 On –– Remove 400k
CHANGING HOLD TIME
To change the hold time from the preset value of 0.4 seconds,
modify the circuitry according to the following table.
CHANGE HOLD TIME
Hold Time
(seconds)
X9000 R9073 R9079
0.3 –– –– 2M
0.4 (default) –– –– ––
1.0 Short –– ––
1.5 Short 470k ––
LOCAL AUX OPERATION
This modification removes the auxilliary audio from the
SCM410 outputs. Auxilliary audio originates from the aux in-
puts of the Shure SCM810, SCM800, and AMS8100 mixers
when linked to the SCM410.
Procedure:
Remove resistor R9187.
MUTE IN
PRECEDENCE TO
OVERRIDE IN
PRECEDENCE