The case for the radio touched the circuit board and shorted the area around the connections for the speakers and plus & ground connections. I need some info from a circuit diagram or a circuit board layout in order to repair the unit ... please help
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check near the rear of the radio.. around the power input connection and the audio transformer there should be a 1n4001 diode.. check it for a short. replace it if it is.. and it should power up.. also in the same area check for any shorted traces.. on the circuit side.. also on the sides of rci main board radios near the bracket screws theres a transistor voltage regulator.. make sure its connected to the board.. sometimes they come loose.
Have you connected BOTH 12 volt+ connections, one is to keep the memory alive only the other for operation. The boat is negative earth?
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After time, the power output transistors heat-up and develop loose solder connections around the areas of the circuit board that draw high current - thus the signal becomes intermittent. Open the case and closely inspect the solder connections for partial or cold solder connections - re-solder the connection.
Also, check for loose cables.
hi and thank you for using fixya:
please check all cable connections for looseness. even they are connect it they might be loose. if this is not the case. then inside you might have a bad connection on a circuit board
It's possible that the battery contacts have become corroded, or tarnished so that the batteries are not making contact with the battery case. DO NOT use steel wool to clean the contacts, as the steel wool shed little pieces into the battery case, and can cause a short circuit inside the radio. Use a brass brush to clean the battery contacts, then spray them with a product called DeOxit to prevent further tarnishing or corrosion. Good Luck,