AMX AutoPatch Modula, Instruction Manual, Page: 121 / 191

Microphone Input and Phantom Power Boards
115 Modula Instruction Manual
Setting the Compression Ratio (changing from default)
Caution: If the enclosure contains the optional microphone power board, make sure the phantom
power selection switches (FIG. 74 on page 116) are set to “OFF” before setting the compression
ratio
.
The microphone input board must be removed from the enclosure to set the compression ratio switches.
ESD Warning: To avoid ESD (Electrostatic Discharge) damage to sensitive components, make sure
you are properly grounded before touching any internal Modula materials. Use an ESD wristband
and cord with an alligator clip attached to a good ground source
.
To set the compression ratio switches:
1. Check that the phantom power selection switches (FIG. 74 on page 116) are set to “OFF”.
1.
Turn off the power switch on the rear of the enclosure and unplug the power cord.
2.
Multiple-enclosure systems – label and disconnect link cables.
3.
If necessary – label and disconnect all wires attached to the board. If wires or cables from adjoining
boards obstruct access, label and disconnect them as necessary.
4.
Remove the two screws from the top and bottom of the plate covering the microphone input board.
Set screws aside for reuse.
5.
Carefully pull the board straight out of the board slot.
6. Change the toggles on the DIP switch for each connector to the desired setting according the table in
FIG. 73.
(Note that the numbering starts on the right.)
The “ON” position (1) is toward the connectors.
The “OFF” position (0) is toward the board’s key notch.
7.
Line up the board with the board guides that are on the top and bottom of the board slot.
Carefully push the board into the enclosure until it is fully seated and snaps into place.
8. Replace and tighten the two screws.
9.
Attach all wires and cables that were disconnected in Step 3.
10.
Apply power to the enclosure.
FIG. 73
This example shows a setting of 0-1-0-0 for a compression ratio of 2:1 for the fourth connector
Compression Ratio Settings
1 = ON and 0 = OFF
Compression
Ratio
DIP Switches
1-2-3-4
1:1 1-0-0-0
2:1 0-1-0-0
3:1 0-0-1-0
5:1 0-0-0-1
Key notch
Top e
dge of boar
d