Sensor wiring failure?

Armson

I am currently down in the Keys diving and before I even got my unit wet I had a sensor failure. When I went to do a MV calibration the test came back as sensor 1 failed. I swapped it out for a new sensor with no luck. I switch the wiring with another cell and it still had a sensor 1 failure. So I assume that the wiring is the problem. I Tried cleaning the contacts with no luck. Does anybody out there have any other ideas?


Oh and by the way. These are the original hammerhead electronics and rebooting them gave me the same results.


Any body out there got any ideas?



-Byron

jiseson

change your wiring harness and see if it fixes your issue

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Jonathan D Iseson

heyydude

Hey Byron,

Set both the Primary and Secondary on the "MV Display" mode.

Read the 3 Sensor mV's across.

If one sensor reads "0" (or not at all), then swap out the positive and negative leads to the Banana Block with it's neighbor (move the Brown to Red, etc) - make sure to move the Ground too - this will help isolate if it is a Ground cable issue).

If that sensor then reads "0" in the new position, then swap the sensor with a pair of wires that do show voltage for their cell.

If mV then appears, you just need a new O2 Sensor Harness - Dive Rite or us can supply that.

If it is Cell Specific, you could have a dead cell.

I'm in the shop now if you want to call, and I can walk you through it.

(814) 395-9509

Kevin Juergensen

Armson

I wish I had a spare wiring harness. Looks like that is going to be added to my spare kit.



-Byron

diverreb

The closest place to pick up a harness is probably Diverite Express in Pompano, or See Brenda at Conch Republic and she could order one in, maybe getting it the next day. I'd call DRE first to make sure thay have it.... Might be cheaper to have them overnight it to you with the cost of gas these days....

You've probably already done this, but pull the harness wires & try a few different combos on the Cell & Block to see if you can get it to work. If it still doesn't, it doesn't sound like a harness issue.

Does it show as a bad cell in both handsets?

I had an issue like that when I first started training, but playing with the wiring harness a few times fixed it.

Richie

Mark Chase

Spare looms are cheep as chips and one of the best features of the HH

However you can check the connections to the banana pin and its an easy strip wire and re-solder job.

I repaired my loom a couple of times like that and I am rubbish at electronics.

Id be looking at the Molex end for the problem. The little pins can be individually removed and inspected. Just wiggle the wire a bit and see if the displayed MV alters. Its a dead give away.

Molex end is a little more tricky to fix but can be done with some pure gold / biox or similar a penknife and a pair of needle nosed pliers.


ATB

Mark

__________________
Is it supposed to make that noise ?

I took my unit to the dive shop and demanded they bolt on every thing that would fit.

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"Doing It Chasey"Hammerhead Eccr Advanced Diving System

heyydude

Just off the phone with Byron.

He has 2 cells which won't go above 37 mV.

Remember, the HH will reject any Cal below 40 mV, since we find virtually all cells below that in 100% are current limited to some extent.

Kevin.

Armson

I cannot thank Kevin enough! We are getting on the Boat now So I am just going to dive OC then recalibrate all the sensors when we get back and I have the rest of the Night to dedicate. Thanks again Kevin for the quick response.





-Byron

netmage

Good rule of thumb to tuck away..... thanks Kev...

-Tim

diverreb

Still a good idea to carry a spare Harness.... They are only $60.00 or so. I change mine out on a yearly basis, separate the wires on the older one and keep them as a spares so I can just replace the bad set of wires, if necessary.

Richie