PART: 1189-3155-ND
PART: 1189-1890-ND
MFG : RUBYCON / 35ZLH470MEFC10X16
DESC: CAP ALUM 470UF 20% 35V RADIAL COO : INDONESIA
PART: 1189-50YXM10MEFRTA5X11CT-ND
MFG : RUBYCON (VA) / 50YXM10MEFRTA5X11
DESC: CAP ALUM 10UF 20% 50V RADIAL COO : JAPAN
thank you very good!
just a reminder that it is necessary to be a bit careful not to mess up those black plastic rings, which are sitting in the countersunk bottom row of holes. Because we have seen that cause issues in the past.
the issue i am referring to was:
if the black plastic rings on the cartridge are messed up or if they are dimensionally out of spec, (on some fake clone tips). then it may create issues for inserting the cartridge into the handle, to get it properly seated. either the cartridge does not go in far enough. or it goes in too far. which of course can often have some variety of negative consequences
perhaps you are already ok there with your mod, so long as there are no sharp edges to cut into the plastic over time (many uses). if those hand drilled holes were all deburred properly. i just cannot see easily that levels of detail from your photo here. There may also be other good ways to protect them. For example to give a softer cushion. like cover in a layer of a silicone that sets (plugging the holes). or adding little plastic washers. or other ways. Such that the weight of the cartridge is resting only on a metal sections (and not plastic sections)
Voltage between connector shield and gnd/earth: 0V
Voltage between tip ground / handle top metal and connector shield: up to 0.9 V when heating!
Voltage between tip ground / handle top metal and earth: up to 0.9 V when heating!
Short circuit current tip ground / handle top metal and connector shield: ~ 430 - 450 mA when heating!
Short circuit current tip ground / handle top metal and earth: ~ 430 - 450 mA when heating!
Resistance between connector shield and gnd/earth: 0
Resistance between tip ground / handle top metal and connector shield (IOW resistance of cable + connector on both sides + shielding): 0 , Huh?!
Note: ~0.1-0.2 in the picture is caused by the measuring tips
WHAT!? How's that possible? The tip GND / handle top metal is connected to GND/earth and it doesn't make any sense to me that there would be any potential
What am I missing?
Voltage between connector shield and gnd/earth: 0V
Voltage between tip ground / handle top metal and connector shield: up to 0.9 V when heating!
Voltage between tip ground / handle top metal and earth: up to 0.9 V when heating!
Short circuit current tip ground / handle top metal and connector shield: ~ 430 - 450 mA when heating!
Short circuit current tip ground / handle top metal and earth: ~ 430 - 450 mA when heating!
Resistance between connector shield and gnd/earth: 0
Resistance between tip ground / handle top metal and connector shield (IOW resistance of cable + connector on both sides + shielding): 0 , Huh?!
Note: ~0.1-0.2 in the picture is caused by the measuring tips
WHAT!? How's that possible? The tip GND / handle top metal is connected to GND/earth and it doesn't make any sense to me that there would be any potential
What am I missing?
well i just took some passive measurements on my handle. And also looked at the PCB seperately and the markings on it.
Then finally i poked a feeler wire (a very long and thin precision screwdriver) down into the hole. Where the cartridge goes....
What seems to be (according to my preliminary findings, take with a pinch of salt).... is that the metal RING (around the end of the handle, that the cartridge sits in). This is not actually connected to GND at all.
That METAL RING has 2.3Mohm (yes mega ohms) to pin 3, which is marked "ID" (perhaps this means idle detect? IDK).
And it has about 6.4Mohm (again mega ohms). To pin 1 on the GX12-5 connector. Which is marked as "S" on the front panel pcb. Again I simply don't know / am not entirely sure what that is supposed to be for. Because I have not looked into that yet.
Anyhow getting back to the point...
Only when you physically insert a C245 cartridge into the handle, does it actually physically connect the METAL RING (on the outside)... to bridge to the pin 4 GND on the GX12-5 connector.
And this bridging is part way down the length of the solder tip. So... you might be seeing the effects of the "2.9 ohms" being split part way down. With some low voltage potential. Because you are in effect measuring onto the cartridge itself. There was a cut away / cut through photo of a cartridge somewhere else on this forum. And it showed the internal geometry of the tip, and the amount of the thickness of the metal coming into the end of the tip, and returning back. And where the thermocouple was etc.
Effectively you have something which is not exactly a 0 ohms metal. It's designed to be converting the current to heat. So it seems reasonable to expect a non-zero potential at some places on that structure... sorry I cannot help further.
Over here I am still trying to figure out how to do this wiring, and completely forgot to order some 6 cores (multi core) silicone cable. That will delay me some weeks now dammnit.... Knew I forgot to order something.
ah ok... but what is 'MC resistance' mean? sorry i do not know the meaning
ah ok... but what is 'MC resistance' mean? sorry i do not know the meaning
Oops, I wanted to say MCU.
So, you had measured that with the handle attached, right?
ah ok... but what is 'MC resistance' mean? sorry i do not know the meaning
Oops, I wanted to say MCU.
So, you had measured that with the handle attached, right?
no
Sorry for the confusion. What I measured (the several mega ohms) was on the handle only by itself. Fully unplugged, nothing else at all, not the cartridge, and not base station / controller pcb.
Understandable because I was referencing those symbols written on PCB silkscreen around where the GX12-5 connector is soldered. I just meant those are the corresponding pins that the handle would then connect to when is later plugged in. But the handle was unplugged fully from everything when i took those measurements.
I remember there was somebody out there who managed to disassemble one of these chinese T245 handles i just have not had time to watch this video...
[edit] however this is not the aixun handle. it is a different model chinese clone station / handle might be slightly different here... But at least it shows for how to open the handle without incurring so much damages.
Oh, oops. Then these resistances don't make any sense. Also, I cannot reproduce that here.
I had opened the handle and it's connected this way:
GX12-5 pin handle / tip
1 + ---------------- heater (middle)
2 GND ------+-------- GND (top metal)
|
3 ID ------+
4 T(EMP) ---------------- temp (lower spike)
5 S(HAKE) -----x
If you check my photos here (attached below). I think we have the same answer. Just you have mis-labelled the pin numbers. Because have flipped the connector by mistake.
well yes, of course
the thing to realize is that the psu should have been designed for short bursts of power. rather than a high continuus power. it only needs to dump current in for about about 3 seconds to get the tip up to operating temperature so fast
once a c245 cartridge is actually soldering and heatsinking into a heavy ground plane. then the maximum power the tip can dissipate across that thermal junction becomes the limiting steady state continuus power draw. which is actually significantly lower... what was it supposed to be exactly depends on the size of the tip. but even for the biggest ones. probably never more than about 80 or 120w
so yes, i would expect the smps to be different or modified in certain ways. to enable higher burt current. (but only for short durations, of just a few seconds). and this is not exactly the same as most general typical off the shelf smps. in order to be so compact design here.
[edit] however presumably this is why we are replacing the electrolytic caps for higher quality ones. to last for a bit longer. with the extra work they are doing... (as am i myself, they are waiting on my desk here)
ah ok thanks! these clarifications were easier to understand now. and quite helpful
indeed if you get an issue with the handle. or the cartridge mis-position (pushed in too far). then a short can potentially occur
actually on my previous t12 controller (with a cheap t12 handle). the handle was badly constructed. and a short did in fact occur. the result was that the switching mosfet very quickly burned itself. and catch on fire. which then messed up and delaminated the pcb.
true what you are saying ocp could be better. so if there is a mod to existing smps (without replace whole entire smps. then that would be pretty cool. a worthwhile mod to include with the others
in terms of avoiding over current... i had already decided to remove the +24v output barrel jack on the rear. to replace it with the relocation of the gx12-5 from the front panel.
so at least that avoids over current coming from that optional feature. (so probably for the best it would seem)
Then can place my order. Since all else is ordered for mods now
And the connector indeed can be the same GX12-5 because Pin 1 is not connected in the aixun T245 handle wiring. So then Pin 1 can be used for routing the stand idle detect wire.
And the connector indeed can be the same GX12-5 because Pin 1 is not connected in the aixun T245 handle wiring. So then Pin 1 can be used for routing the stand idle detect wire.
This only applies to T245, not to T12 (and probably 936 as well), where the pin should be used. Do you have a T3A T12 handle to check?