Grass Valley FXC-S201 - Manual (Page 32)

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CommLink FXC-S201 Operation
Using the Auto-Null Function
Using the Auto-Null Function
The Auto-Null function is used only with CommLink FXC-S201 Fiber Optic Intercom Link
units that are connected to Two-Wire system. Auto Null has no purpose with a Four Wire
system.
To use the Auto-Null Function
1 Before starting the Auto-Null process, ensure the following:
• A: All headsets are connected
• B: Headsets are not being worn by any operators
• C: Headset microphones are off
2 To Auto Null Channel 1 (CH1), hold the Auto Null switch (A) in the direction of CH1.
The system will generate a tone and the indicator (B) will blink green while the Nulling
process occurs. This should take about 7.5 seconds.
3 Once the Auto Null process is complete, the tone will stop and the indicator will glow
green.
This indicator will be red if there was a problem with the null. This can occur if any of
the items in Step 1 are not followed.
4 Once you troubleshoot the Null problem, perform Steps 1-3 again.
5 For Channel 2 (CH2), hold the Auto Null switch (A) in the direction of CH2. Steps 2 and 3
will then follow with the CH2 indicator being active (C).
6 After completing the Auto-Null process, check that side-tone operation and overall
intercom performance on each intercom channel is correct.