GF99/99
Contributor
Here are my tips that no one has mentioned yet.
Take care of your HUD!!!! The new divecan Shearwater HUD might be the weakest link on the JJ and all other units that are using this HUD. When your carrying your head around make sure you tuck the HUD into the fabric hose protector so its not flopping around. I have seen two of them crack from people letting them flop around and hitting stuff while being carried, also have seen two of them flood. Only plus side is if this happens just give Shearwater a call and they will replace it for free, just a hassle if your located in a remote area.
Next tip is if you do a battery change take special care not to pinch inhalation hose corrugation on the battery cover. If you do this the battery cover will not seal correctly and you will flood it resulting is the head needing to be sent back to Denmark for all new electronics replacement. I have not done this but someone I know did.
Always check your MAV buttons during your predive check. If you are diving saltwater and since the MAV's just use regular BC inflation connections they ted to let in a little more water in than QC6/QC4 connections so if your doing lots of off board plug ins/dill switches I find the JJ MAV always need a little extra TLC so they don't get sticky about every 25 hours I re-grease the o-rings on mine or just when you can see the button is not popping out like it normally does (plus always change them out annual when I do the full annual service) and have never had an issue since.
Small minor thing you can do if diving saltwater a lot is put a little piece of rubber inner tube between the backplate and can I find it helps keep the stainless steel aluminum galvanic corrosion down. On a different unit I found that the aluminum would start to get pitted around where the backplate and backplate bolt connected to the can.
Lastly make sure you rinse your first stages well, remember the JJ comes with US4 regs and the O2 side reg diaphragm cap is pointing up so saltwater will kind of "pool" in it so give it a good extra flush after every dive. Oh yeah and you can use some small budge to tie up your fist stages so when you disconnect them there not dragging/resting on the ground, just a pet peeve on mine I hated that the first stages were always kid of resting on the ground when they were not hooked up to tanks.
Take care of your HUD!!!! The new divecan Shearwater HUD might be the weakest link on the JJ and all other units that are using this HUD. When your carrying your head around make sure you tuck the HUD into the fabric hose protector so its not flopping around. I have seen two of them crack from people letting them flop around and hitting stuff while being carried, also have seen two of them flood. Only plus side is if this happens just give Shearwater a call and they will replace it for free, just a hassle if your located in a remote area.
Next tip is if you do a battery change take special care not to pinch inhalation hose corrugation on the battery cover. If you do this the battery cover will not seal correctly and you will flood it resulting is the head needing to be sent back to Denmark for all new electronics replacement. I have not done this but someone I know did.
Always check your MAV buttons during your predive check. If you are diving saltwater and since the MAV's just use regular BC inflation connections they ted to let in a little more water in than QC6/QC4 connections so if your doing lots of off board plug ins/dill switches I find the JJ MAV always need a little extra TLC so they don't get sticky about every 25 hours I re-grease the o-rings on mine or just when you can see the button is not popping out like it normally does (plus always change them out annual when I do the full annual service) and have never had an issue since.
Small minor thing you can do if diving saltwater a lot is put a little piece of rubber inner tube between the backplate and can I find it helps keep the stainless steel aluminum galvanic corrosion down. On a different unit I found that the aluminum would start to get pitted around where the backplate and backplate bolt connected to the can.
Lastly make sure you rinse your first stages well, remember the JJ comes with US4 regs and the O2 side reg diaphragm cap is pointing up so saltwater will kind of "pool" in it so give it a good extra flush after every dive. Oh yeah and you can use some small budge to tie up your fist stages so when you disconnect them there not dragging/resting on the ground, just a pet peeve on mine I hated that the first stages were always kid of resting on the ground when they were not hooked up to tanks.