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Joined: Nov 2014
Posts: 3
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I have a Dukane MCS350 that keeps blowing the F7 fuse on the Analog card. this fuse provides the 15v output on the card and I am not sure what runs on the 15v output. the console still has power and functions but none of the audio channels open after the F7 fuse blows. I have changed the Digital Card, The Analog card, both 4 Wire switching cards and all the ribbon cables, metered for ground faults, stray voltage, ect. I found that when the fuse is replaced all of the audio channels work for a short period of time, with the system powered and the 4 wire cards disconnected (so all of the field wiring is disconnected) the system blows F7 after about 20 minutes. No paging or bell schedules happening at all, I changed the power supply and amplifier also. Not sure what else to try any ideas.
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Joined: Jan 2010
Posts: 223 Likes: 1
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The 15V supply is the Vdd supply to the digital card. Even with all field wiring disconnected (including the ACCs) and a new digital card installed, the fuse still blows after 20 minutes?
Last edited by tim10; 11/17/14 06:41 PM.
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Joined: Nov 2014
Posts: 3
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I have tried so many different combinations of things i cant guarantee that the exact combination you described had happened, I will try that tomorrow and let you know.
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Joined: Nov 2014
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I figured out the problem, one of the 4 wire cards was bad. replaced it and all is well.
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