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If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" of your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
There should be a short circuit inside its circuit board. You have to check the audio output circuit to get the fault, and to replace the damaged component/s. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts
Circuit diagrams of SMPS & power amplifier to many models of JBL sets are given.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.
Your EJ is your electronic journal of transactions on an electronic cash register. The clearing of this "error message" probably depends upon the machine and probably means tracking down a user manual for that register. So, you would need the brand and model number to search for a user manual. Even if you choose to post the question at a consumer electronics "answer site", you will need to supply that basic information. Google "brand model number cash register user manual" supplying the actual brand and model number. Or, go to the manufacturers site and conduct a search on that site.
There is no "one command for all cash register brands."
According to the JBL users manual, an L7 speaker weighs 75 lbs (34.1 kg) . The dimensions are (hXwXd) 45.9"x 9.625" x 17.6" (1165mm x 244mm x 447mm). You can download the entire manual at this site:
It is downloaded in Adobe. It also asks for your email address, but will download without it.
Hope this helps