My ZD-985 jammed exactly in that point.
Set temp at 450 C, waited for 10 minutes, cleared with the clenaing tool, and it worked fine.
I do not understad how the OP can desolder at 250 °C.
In my experience such a low temperature will not allow efficient and fast desoldering (and even soldering).
My unit is set to 370 °C...
By the way, I believe that the Jaicar gun is too similar to the ZD-985 one for not being a ZD-985 gun, and you can get it on e-bay for a few dollars.
This is an Italian seller,https://www.ebay.it/itm/PISTOLA-RICAMBIO-STAZIONE-DISSALDANTE-ZD-985-ZD-915-SSD-25-ZD-91-SALDANTE-7-POLI/281972643624?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D20180221161347%26meid%3D496b0ecca3b145f6a33265e8de680b0a%26pid%3D100505%26rk%3D1%26rkt%3D1%26%26itm%3D281972643624&_trksid=p2045573.c100505.m3226 but you can find others in your Country..
Best regards
I like to desolder between 350c to 400c, I like to use 400c when I have to deal with a larger ground plain.
That dose look like it yes, sadly that seller dose not ship to Australia, but because they list the model ZD-985 which is the same as the rhino tools, and in the eBay listing you have linked, this gun has the 7 pins.
Meaning it should work, thank you for that.
I should have read more thoroughly too I read it as you needed a new gun not a clean
My Aoyue has a different tip to yours but clearing it should be similar crank it up to 250-260 and even add some more heat to it from the front with a soldering iron to get some power into the tip. So not necessarily more temperature but getting all of the tip to melting point. In my case I add the tip of the iron to the rear of the tip shown in the Pic. Tip cleaner works great or even copper wire if that's all you have should sort it out.
Tip shows a partial blockage (shot tonight so I failed to clean it last time). Generally will clear when hot and a tap on the bench. Mmm Time to do the dusting too
Yea mine did not look like that, the blockage was more towards the top, I'd guess 1.5 cm from the tip.
And it turns out it wasn't that small pile of solder I watched get sucked up into the gun, but dirt... bloody dirt...
Moderate high means about 350 degC ~ 400 degC around. Repairing multi-layered boards common temperature.
If the temperature is low, it's difficult to melt the solder to desolder it.
Actually blockage happen when the flow is slow or low after previous desoldering. The small piece of filter get stuck easily.
If you have difficulty, take our the glass cartridge and remove the black rubber "grommet" from the gun, to expose the suction tube. You may see the stuck bids, ply with plier or Aid the 350deg.C with another soldering gun at the back of the tube, then push thru. Careful with melting plastic body with second gun.
I've found that sometimes I do have a little trouble taking out the chamber, but mostly because I push in the wrong direction.
My ZD-985 jammed exactly in that point.
Set temp at 450 C, waited for 10 minutes, cleared with the clenaing tool, and it worked fine.
I do not understad how the OP can desolder at 250 °C.
In my experience such a low temperature will not allow efficient and fast desoldering (and even soldering).
My unit is set to 370 °C...
My Aoyue is numbered 1-10 on the desoldering side but is still has a calibration pot (maybe so it can be turned up to 11) So the 260 is a measured temp at the tip itself with a thermocouple. Different construction too as per below. Most likely equates to something hotter on the Doss/Jaycar tips?
If that tip would fit the 2 mm tunnel in my gun, it would make life SO much easier.
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Now, I have a few photos I have taken, I kind of 'lost it' after about 20 mins of getting no where with a stripped 2.5mm 2c+e solid core cable, used to start trying to clear the blockage and found it got me no where.
So getting my hands on a 2mm drill bit, I carefully insert the drill bit and slowly turned it. I found small bits of dirt coming out and over time, it seemed to clear. Now I used my cleaning rod and found zero resistance, so to be 100% sure I checked down the barrel, before sticking the drill bit through again from the glass chamber side and pushed it through with the aid of my copper wire.
Now, the gun sucks like new again.
Please see photos below.