Rework Station Pump - Can They Be Repaired ?

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

you could draw one up in 15-30min's

Maybe (probably) you could, my ckt drawing skills/understanding are pretty rusty/outdated,
lol!

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

you could draw one up in 15-30min's

it's mostly a 555 that i suspect is for the pump, and an opamp related to the heater feedback.
i should add that mine does not have a digital display - those probably contain even less.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

unknown without a pcb foto
these units get cloned so you cant be sure what's inside from the outside.

i would say they always need a recap even if new!

lol, a sign of the times, huh - no schematics came with it either, I suppose...

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

unknown without a pcb foto
these units get cloned so you cant be sure what's inside from the outside.

i would say they always need a recap even if new!

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

the pcb's in these things are a joke, i resoldered about 80% of mine.
things like a transformer not even sitting flat on the board!

How similar is yours to mmartell's? Just wondering, from fbooktablet's description of his unit's failure, if some ckt component went south...

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

the pcb's in these things are a joke, i resoldered about 80% of mine.
things like a transformer not even sitting flat on the board!

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

It didn't fail in use just noticed it sounding odd last time I turned it on. Made me think to check the wand for air flow before it melted in my hand anyway.

Okay, had to go reread from the start - do the magnets look beat up at all?

Have you done any checking around on the ckt. bd. to see if anything seems awry there?
I'm thinking that, from the looks of the top of the board, the bottom probably looks kinda funky too, maybe has some rosin bridges on it which might affect its operation.

Other than that I don't know anything else to do...except look into fbooktablet's suggestion, and maybe a variac to vary the air-flow a little.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Since looking at the newer pics I can't agree with that possibility anymore, having seen those manifolds. Before those pics, it seemed debatable whether the work was being done inside the inner chamber or outside it; I do still think it's possible that the diaphragm is supposed to be secured somehow to the ends of the spindle so its lateral movement is more limited (not to say that that makes it true &^).



I'm wondering now about the noise it made when it failed, did it make a big noise and then quit, or did it start making a noise and then you turned it off because of it?

It didn't fail in use just noticed it sounding odd last time I turned it on. Made me think to check the wand for air flow before it melted in my hand anyway.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Interesting. I ohmed out both coils and they seemed ok, about 146 ohms each.

[fbooktablet]

Re: Rework Station Pump - Can They Be Repaired ?

Even I had this prblem. The coil is not working any more.
The circuit works like a dimmer using traics.
These diaphragm doesnt go bad its the coil that sops moving in lateral direction n just vibrate.
U can use dual diaphragm aquarium pumps n seal the pipes with some hot glue.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

so it's what i said,
when the pole pulls inward, the diaphram will flex away from the pole and allow air to leak through those holes - a bit.
and when the pole moves outwards it will press against the holes and seal them.

Since looking at the newer pics I can't agree with that possibility anymore, having seen those manifolds. Before those pics, it seemed debatable whether the work was being done inside the inner chamber or outside it; I do still think it's possible that the diaphragm is supposed to be secured somehow to the ends of the spindle so its lateral movement is more limited (not to say that that makes it true &^).

at this point, if the housing is not cracked, start looking at how the coils are driven - incase it's a current issue not moving the pole far enough.

I'm wondering now about the noise it made when it failed, did it make a big noise and then quit, or did it start making a noise and then you turned it off because of it?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Your assumption was based on my assumption lol. I was thinking that the diaphragms may be designed to support the piston in place (beside their obvious function) in which case they have failed. Need to design a test to float the piston and see if it functions properly.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

The coils are fed voltage controlled a/c, maybe you can gleen more from the pic of the control board I don't know enough about that. I measure 77v at lowest speed and 110v on high so that much seems to be working right even though the piston was essentially stuck in place and not moving.

What the hell could be wrong with this thing ?

can you measure the frequency that the different voltages are at also?

As far as what's wrong, I thought you said that the spindle was getting stuck to the poles, I've been going on that assumption - Or do you mean, why are they doing that?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Pic 3 and 4 show what looks like a "button" that fits over the assembly before the nut gets tied down so that part of the assembly is sealed, as it is around the perimeter when the diaphragm is fully installed.

There is too much play - the magnetic forces are too strong and overcome whatever should be keeping the piston centered in the coil assembly. Need to find a way to simulate keeping the piston centered to see if it will oscillate properly under test conditions.

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

They are definitely magnets on the piston was just wondering aloud if they became magnetized when they shouldn't be.

The coils are fed voltage controlled a/c, maybe you can gleen more from the pic of the control board I don't know enough about that. I measure 77v at lowest speed and 110v on high so that much seems to be working right even though the piston was essentially stuck in place and not moving.

What the hell could be wrong with this thing ?

if you assemble it without the diaphram on one end and with the end section missing - can you move the pole or is it sticking?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

so it's what i said,
when the pole pulls inward, the diaphram will flex away from the pole and allow air to leak through those holes - a bit.
and when the pole moves outwards it will press against the holes and seal them.

at this point, if the housing is not cracked, start looking at how the coils are driven - incase it's a current issue not moving the pole far enough.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

They are definitely magnets on the piston was just wondering aloud if they became magnetized when they shouldn't be.

The coils are fed voltage controlled a/c, maybe you can gleen more from the pic of the control board I don't know enough about that. I measure 77v at lowest speed and 110v on high so that much seems to be working right even though the piston was essentially stuck in place and not moving.

What the hell could be wrong with this thing ?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

it's what i originally said about the 4 holes by the look of it.
the air enters the center around the coil, gets pushed through the end pieces and combined before going into the white box that is probably a filter or expansion chamber.

No. The four holes are locators that fit into matching tits on either end of the piston, presumably to enforce proper orientation.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

Two more pics and a new theory.

The first pic is the unit right side up. One hose goes in the top into the main chamber while the other end is just left hanging inside the case. Maybe just to keep the main chamber itself from pressurizing.

or depressurizing...

Each diaphragm goes into the rear chamber (purpose ??) and one hose leaves that chamber and goes to a plastic tank.

just a guess, to provide higher volume resevoir...

The second pic shows the valves on the inside of the diaphragm cover.

Dam, no reed valves...

Do you think the piston should contain two permanent magnets or some non-magnetized steel ? If there was no attraction then the piston would sit properly until the coils were energized.

I think it should have magnets, with no current thru the coils the attraction should be about the same in either direction; but, if it works ok with just metal pieces then I guess the designer saved the mfg. a few pennies. I'm curious as to how many cfm that pump is good for. Also, can you tell whether it uses line freq. or its own generated AC to run the motor? If there's a way to vary the airflow, maybe it has a miniture variable frequency drive on that control board, hmm...

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

it's what i originally said about the 4 holes by the look of it.
the air enters the center around the coil, gets pushed through the end pieces and combined before going into the white box that is probably a filter or expansion chamber.