Can you try pressing the LEVELS button and selecting the outputs tab? You may have the gain turned down on the 2nd channel.
You could also try a factory reset:
INITIALIZING THE H7600
Initialization of the unit will clear out the internal memory and return the unit to factory defaults. If you use this task in the future please be sure to back up any created presets or user saved information prior to performing this. To initialize the unit: With the unit powered down you will press and hold the ‘8’ key and then power on the unit. You will hold the ‘8’ key until you see “release key now” appear on the display, you will release the ‘8’ key but then you must immediately hold it down again until you see the following message appear: Do you really want to lose all the stored information? Selecting yes will begin the initialization process which will take about 30 seconds. Once it is complete, the main screen will appear.
