Although I doubt that it is just a blown fuse, you'll see a bunch of rectangular holes around the perimiter, with an arrow next to the hole. Use a small screwdrive to move the tab in the direction of the arrow, and work your way around the module until it releases. I usually start with the one closest to the card connector, so I can pull it apart as I go.
FYI - This is a post I wrote more than 2 years ago on the 206 cards, If you open it and cannot get it working go buy a 308 as I suggest below... (you can pick up the 206 cards on ebay for just a few buck but remember it is probably 20 years old)...
old post...
Static is a very common problem on the old 206 modules. Avaya/lucent/ATT last made these modules in 1998 so the odds are the 206's in your system are at least 10 years old if not 15. Capacitors become flaky or just go bad. Before you sell the customer a "new" 206 make sure they know that the guts are at least 10 years old. I have had a few 206’s"refurbished" However, it seems like the static will appear on another port. If you are going to get it repair be sure the company replaces capacitors on all ext ports. I literally have a 5 ft stack of old 206 that all have some problem with them. I give them to my nonprofits clients that may need a few additional ports on an existing system. I put phones on the good port and don’t use the bad.
Someone else pointed out that the static sometimes take a while to start. If you bring a card home it could take more than a day for the static to start. I also think heat (temperature in the phone closet) plays a key roll in both the static appearing and the failure of the cards.
Since you have 2 cabinets I assume that at least one is completely full. The old cabinets have the modules closer together so with a full old cabinet the modules do heat up. I would suggest you don’t put the covers on the cabinets.
Best option would be to convince your customer to upgrade to new partner ACS and 308 cards. It will cost less in the long run compared to T&M on tracking down static. 10-15 year life span for phone equipment sounds pretty good to me.
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