The best way is to contact Mackie support directly. They are extremely helpful. Please note that these units are not the easiest to access. Extreme care must be taken when dis-assembling them to prevent damage to the internal cables. The contact information is listed below. Just follow the link and either send an Email or call them directly. Also, have the serial number handy as there have been a few mods in the lifetime of the 1604 model
Dan
Link: http://www.mackie.com/products/home/contact.html
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