EB832 Attempting to Communicate with Apex (Bootloader Mode)
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_AV
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I've heard that a series of the latest firmware updates may have been causing module connectivity issues. So I'd rule the firmware issue out first.
Otherwise, the head unit uses the same type of transceiver which fails just as often. Worth investigating.
I don't have a repair video specific to the head unit yet, but the diagnostics are nearly identical to this:
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_AV
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Unfortunately, no. MAX3059 was used in all Apex classic modules including the head unit. It is a 5V circuit. Starting with Apex 2016, including EL, all new modules are running 3.3V CAN transceivers. Different voltage and pin configuration.
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_AV
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yep... I'm slowly running out of stock for repairs as well. They are being used heavily in the automotive industry. Massive shortages currently.
Kershaw
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Do you happen to have a small list of acceptable replacements. I found these 3.0 to 3.6 v ones that have lots in stock. Spec wise they look similar to the ones another reefer posted.
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How did you pick that part #? I'm looking for something in stock, do you think SN65HVD232D would work?
chris30559
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I just had this issue with my apex classic version, the Eb8 transceiver was clearly bad as half the part was blown out and missing, so I replaced it and its still not working, (Flashing amber light and not detectable by head unit) my repair job looks pretty good to me, I inspected it several times as well as other parts in the area and it seems ok. is it possible the transceiver on my head unit is also bad, I examined it physically and it seems fine, I have no other way to test it unfortunately. is it worth ordering another transceiver and attempting a replacement on the head unit, looks a bit tighter of an area.... or is it possible It has other issues also.
the head unit seems to function perfectly fine on its own green light, network communication all works. it just won't control the only other item I have which is the EB8...
on a more unusual note, if I have no intention of using the EB8 and head unit with any other Neptune product in the future, is it possible to completely bypass the transceiver? wire the head unit directly to the EB8 with some cat5 or something? as in wire TXD and RXD from the head unit to the corresponding RXD and TXD on the EB8?
the head unit seems to function perfectly fine on its own green light, network communication all works. it just won't control the only other item I have which is the EB8...
on a more unusual note, if I have no intention of using the EB8 and head unit with any other Neptune product in the future, is it possible to completely bypass the transceiver? wire the head unit directly to the EB8 with some cat5 or something? as in wire TXD and RXD from the head unit to the corresponding RXD and TXD on the EB8?
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_AV
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It's certainly possible that the head unit is bad. or the main controller on your EB8.
And yes, you could technically avoid the transceiver entirely. but then you will be dealing with errors and losses in data transmission on your own.
And yes, you could technically avoid the transceiver entirely. but then you will be dealing with errors and losses in data transmission on your own.
chris30559
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thanks for the response AV, since the transceiver was literally blown to pieces on the EB8 I'm worried that maybe the controller on the EB8 might be toast as well. if that's the case then its probably a loss. I was just hopeful since relays do click when powered on and the amber light does flash.
that's good to know I can bypass the transceiver on both ends, I may just try this as a way to verify that both the head unit and EB8 can in fact still communicate, if it works I can order another transceiver and do a proper repair in the head unit. I don't know why I just didn't get 2 of the IC's from the start... dumb mistake. .
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Are you still working on EB832 units? I have one that in the same condition as this post that I would like serviced if possible. PM me please either way. Thanks
Cranie
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I can also confirm a short on the 1Link line will take out the CAN. I thought it would be another MW Buck Transformer so I just replaced it but I have no comms. So now I have to wait for Mouser.
Cranie
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It gets better. Replaced the CAN in the EB832 and it connected on the bench. Put it back into the system and everything lost comms. Head unit now has no ability to see any modules including the display. Opened it up and the MAX tranceiver in it (U16) is fried. NO idea what is going on. So now I'm waiting on those from Mouser. If that doesn't fix it I'm having a plastic bonfire.
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_AV
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In nearly all cases, the reason the CAN transceiver would burn out is because it receives more than it's rated voltage. Either 12v from aquabus or 24v from 1Link. You still have a short there somewhere.
