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Bad sonar on humminbird 997c #10813554 05/02/15 03:53 PM
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Hunter's Dad Offline OP
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I am not getting a good reading from my Humminbird 997c. I was having trouble with the side imaging but recently the sonar starting reading bad as well. I get a bottom reading but the display only shows a very faint line. I upped the sensitivity but that doesn't seem to help. I installed a new transducer because I thought that was the problem but it hasn't helped. Any settings I can try? I restored defaults but that didn't help either.


Re: Bad sonar on humminbird 997c [Re: Hunter's Dad] #10814815 05/03/15 06:16 AM
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Ltcm09 Offline
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Sounds like you mounted your transducer in the wrong place.

I suggest you post pictures of whats going on.

Re: Bad sonar on humminbird 997c [Re: Ltcm09] #10815381 05/03/15 05:54 PM
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Hunter's Dad Offline OP
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Originally Posted By: Ltcm09
Sounds like you mounted your transducer in the wrong place.

I suggest you post pictures of whats going on.



Transducer is mounted same place as other one was and it worked great for 2 years. I sanded hull and made sure to get a good stick. Getting same reading now as I did before I replaced transducer so I think that can be eliminated. I will try to get a screen shot today to show what I am seeing.


Re: Bad sonar on humminbird 997c [Re: Hunter's Dad] #10827326 05/08/15 03:20 AM
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David Medler Offline
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I'm having the same problem with my 997 mounted on the TM. Please share any info you get.

Re: Bad sonar on humminbird 997c [Re: Hunter's Dad] #10831632 05/10/15 01:47 AM
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leanin post Offline
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run the units diagnostic menu. also make sure the plug is connected good, and the sonar isnt turned off


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