I have a E7D MFD with radar and a P79 (thru hull) transducer. My boat is a Seahunt 234, less than one year old. MFD installed upon purchase. Shortly after we got the boat, I noticed the MFD was picking up a depth  reading intermittenly. Last few times I took the boat out, it displayed no readings. frustrating. We've had no fish finding capability. Yesterday, while I was washing the boat I noticed a reading. Is there something I should look at/for that may be causing a fault.  Thanks

Views: 492

Reply to This

Replies to This Discussion

Welcome to the Raymarine Technical Forum Bernie,

Please note that fishfinders are not designed to return a bottom image or depth value when the hull is out of the water.  Begin by checking the following two items:

  • verify that the transducer reservoir is filled as the transducer is designed to transmit energy through the hull via a fluid medium (typically RV antifreeze)
  • verify that the P79 transducer has been selected within the MFD's transducer configuration settings (HOME->FISHFINDER->MENU->SET-UP->TRANSDUCER SET-UP->TRANSDUCER)
  • verify that the transducer is pinging (an automobile diagnostic stethoscope may be helpful in listing to the transducer)

Transducer location is critical to maximizing the performance of the system.  It is also important to periodically check in-hull transducer reservoir fluid levels to ensure that they are full.  Also, when operating in depths greater than 180', the 50kHz frequency is recommended.

From a performance standpoint, properly installed thru-hull transducers will typically deliver the best performance.  The performance of in-hull transducers may be as much 20% lower than a thu-hull of similar transmitting element design.  As hull designs, materials, thickness, and other factors differ, performance of in-hull transducers will vary between boats.

In order to install an in-hull transducer, the following minimum hull requirements must be met:

  • the hull must be constructed of solid, non-cored fiberglass in the location where the transducer will be installed.
  • the hull must additionally be less than 1" thick in the location where the transducer will be installed
  • the hull must not feature hull aerating steps (if so, the transducer must be located forward of the step.  Owners must recognize that such an installation location may cause the section of the hull below the transducer to loose contact with the water when the hull lifts while operating at high speed)

Before bonding the transducer reservoir to the hull's inner surface, it us recommended that this location be tested first.  In choosing the transducer mounting location, it is recommended that baseline performance of the fishfinder/transducer be established with the transducer held over the side of the vessel while the vessel is stationary and in water having a depth of at least 30'.  Suspending the transducer in this manner can also be used to test to operation of the DSM.  A series of snapshots of the fishfinder's image should be taken as a baseline to then compared the performance of proposed transducer installation location(s) while trolling, while on plane, and at high speed.  One would then rest the transducer on a ZipLock bag which has been filled with water (purge all air) and temporarily placed on the inside of the hull in the area where the transducer performance will be tested.  Transducer site testing should be performed while the vessel stationary, trolling, and when on plane until the best transducer installation location is determined.  After testing has been completed and the best installation site determined, then the transducer reservoir may be fastened to the inside of the hull per the transducer installation instructions.

Reply to Discussion

RSS

Events

Videos

  • Add Videos
  • View All

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

Rick McCowan replied to David Anderson's discussion ST60+ Wind Repeater to Master
"Hey, is anyone out there? How do I determine if the sensor or the display is at fault? My multimeter shows voltage from each connection on the sensor to the display. Sometimes the display acts as a master and sometimes as a repeater. ...although it…"
yesterday
Wim Bakker updated their profile
yesterday
Rick McCowan replied to David Anderson's discussion ST60+ Wind Repeater to Master
"Update... The display is now coming up as the master but with no movement of the wind indicator and knots are 0.0. "CAL" is flashing but circling the boat does not seem to affect anything. Does this point to problems with the display or…"
yesterday
Neal replied to Neal's discussion I70 update looses settings
"Actually, my last update this spring which included three updates to my e-7 charplotter and one update to the i70 seemed to retain the i70 pages when I restored the system through the chartplotter while using my backup settings.  The only thing…"
Friday
Rick McCowan replied to David Anderson's discussion ST60+ Wind Repeater to Master
"I have power readings from each masthead sensor wire reaching the ST60 wind master display but the display still powers up as a repeater. Why does it not recognize the sensor and power up as a master?"
Thursday
Marc Southard replied to Marc Southard's discussion ST70 Autopilot and NMEA 2000
"I've connected the B&G MFD to the X10 course computer. Question is: should I use RS232 or RS422 protocol for the connection? Question 2: since the X10 connects over both N2K and NMEA0183, does it give priority to one protocol over the…"
Thursday
Tom Falck replied to Neal's discussion I70 update looses settings
"+1 on providing a mean to backup and restore i70 settings!  Or, at the very least include a warning when doing an MFD update to manually record ALL of your settings on your peripherals - the backup only backs up the MFD settings!. I have 6 i70s…"
Tuesday
Joel Richardson replied to Joseph Myerson's discussion Error message "2000" on my ST2000+ autopilot
"I have same problem. It is only one year old. Will I need to send it in for repair? Joel"
May 21
Diana Morgan replied to Clarence Harvey's discussion No Goto or Stop goto Functions on E80
" "
May 20
Dave replied to Scott Gooding's discussion EV-100 Power autopilot produces sonar interference
"I have the same problem with a recently installed ev100 and my e127. I connected rf ground to my ground bus, installed a suppression ferret to the Acu & pump power and isolated the transducer cable from the autopilot. I also updated all the…"
May 19
Stéphane updated their profile
May 12
steven philips updated their profile
May 9
David Horvath updated their profile
May 7
William Stocker updated their profile
May 7
Ken Legge updated their profile
May 4
Jim updated their profile
May 4

© 2016   Created by Moderator - Raymarine, US.   Powered by

Badges  |  Report an Issue  |  Terms of Service