Appendix 1 - Internal Adjustments; Disabling The Front Panel Gain Controls (Dual Channel Amps) - MC2 Audio ti series Instruction Manual

Appendix 1 – Internal Adjustments

Disabling the Front Panel Gain Controls (Dual Channel Amps)

For added security the front panel potentiometers can be disabled, preventing
unwanted tampering with gain settings of any amplifier. This is achieved by
setting links on the input board internally.
SAFETY WARNING
Removing the lid will expose you to potentially dangerous voltages!
Disconnect the amplifier from the mains supply and do not touch any
heatsinks as they may still be at a high potential!
After removing the lid and with the rear panel facing you, locate the input circuit
board as shown below – it is attached to the input and RS485 XLR connectors.
Find the three sets of links as marked by the arrows, and move them as shown to
either disable or enable the pots as required.
Make sure all three are set to the same position!
HD104 disables the pot for channel A, HD204 disables the pot for channel B, and
HD205 sets the pot enabled/disabled flag, the state of which can be monitored
remotely though ICORE.
Once disabled, the pot gain is set to 0dB – this is wired in series with the digital
potentiometer, which may still be used to adjust the gains remotely. Remember
that if disabling the pots has not set the gain to the value you expect, the level
may have been turned down remotely – check through ICORE and adjust if
necessary.
Amplifier Operator's Manual Page 49