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Dissassembly + Repair Guide - Keurig B70 Platinum : Single Serve Coffee Machines - Page 23

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Dissassembly + Repair Guide - Keurig B70 Platinum

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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby MarkRG » Thu Apr 14, 2016 9:52 am

Well I finally did get to it. With success! The unit is brewing reliably again, with the input of this thread, thanks. :) Some of my kcups don't have the 2.0 drm so I have a vested interest in keeping the B70 going at least until all the ones I buy go there.

That top is a total pain to remove. Actually used the other method mentioned. Prying the top up enough on the front left of center to get the far left clip, then pop the other three working from left to right around the back of the unit. No easy way to get the right leverage from the bottom. Also modified the clips by thinning the hook side down so it should be easier to remove if there is a next time. Also, in removing the bottom plate, it doesn't conduct ground to anything else. So I simply ground off the rivet, used a small bolt and nut to connect all the grounds together, taped it up with stretch rubber electrical tape, and tucked that into the wire harness.

In just observing the unit, I'd agree no real indication of even the possibility of blockages on the air side, all the tubing and the clear dome look perfect. No indications of any leakage either. I only thought as a theory, in it doing the brew, some steam vapor is going to go up the air vent side when it's heated, but no indication of deposits. After putting the base back on to test run it, removed the aft(air) valve. Blew through both lines which air moved through very freely. Plugged the unit back in to energize the valve, then blew through the valve, where there was marked air resistance but some passing. Fits with how the unit was acting. So, picked up a few of those solenoid valves at Amer Sci and replaced the aft one. The new one energized allows air movement much more freely. Test ran with a full tank of water and a measuring cup, changing brew cup settings. Reliably got the requested amount of hot water every time.

I also picked up on the other tip mentioned above in adding a 'rain hat' to the top of the air pump made out of an empty k-cup. Siliconed the brew hole on the cup. Cut the rim down on one side, and putting that in back, the cup stuffs in on top of the motor snugly where it won't ever go anywhere. If there is any leakage from above, it won't get in the air motor, will just run out the bottom of the unit.

I also did something else that I think is worth mentioning. In observing it running to make the max 12oz brew, it pushes water right to the top of the clear dome with the real possibility of pushing water into the air line that way. Probably how the air pump is being messed with for some. So I had an idea. Went to the pet store and picked up an aquarium air line check valve. These are used in an active aquarium in case the air bubbler pump or line fails. The check prevents the tubing from siphoning the water out of the tank. They're made of acrylic so I roughed the ends a bit with sandpaper and inserted it in the air pump line just below where it tees into the bigger tubing. If you add one, make sure the flow arrow or out end is pointing to the bigger tubing, not at the air pump.

Again, thanks. Some time and approx $5 vs another $125+ is a huge difference.
MarkRG
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby GetSet » Thu Apr 14, 2016 5:51 pm

The air line check valve sounds like a good idea and should prevent that kind of catastrophe from happening, as long as it also allows mild backwards airflow when the hot water tank is first filling. Other than that, glad you got yours working. I did the same thing to the cover of mine when I opened it. I filed off the hooks in the tabs so that a person can just pull the cover off with mild force, rather than using tools. I also didn't see any reason to keep the rivet in the metal base grounding lug, so I drilled it out and used a nut and bolt as well. Mine has been going for 4 years or more since then and hasn't needed any further repair, so it is well worth repairing these.
GetSet
 
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Location: Greenville, TX

Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby MarkRG » Thu Apr 14, 2016 10:06 pm

MarkRG
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby GetSet » Mon Apr 18, 2016 1:25 pm

I see where you are now. Sounds like a good idea. It won't affect anything besides protecting the air pump, which could use some protection :o.
GetSet
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby bobhyman » Sat May 21, 2016 10:39 pm

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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby melman » Wed Jun 22, 2016 6:03 pm

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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby GetSet » Thu Jun 23, 2016 10:52 pm

It sounds like it would be consistent with the aft valve stuck open, in which the pressure from the air pump is escaping, so it can't push out the water. It is puzzling that there are air bubbles coming out of the bottom of the water tank (I assume that's you mean the outside water reservoir, since you can't see the inside tank yet). Right now I can't really think exactly what would cause that.

Since the internal tank fills, then the water pump should be OK. Since the brew cycle completes when you block the overflow tube, the air pump should be OK, too.
GetSet
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby melman » Fri Jun 24, 2016 11:01 pm

Correct, the bubbles come out in the bottom of the external water tank.

We have another machine in our office that is broken in exactly the same way. So maybe we'll buy some solenoids and have a repair party.
melman
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby melman » Tue Jun 28, 2016 12:12 pm

I will also need to fix whatever is leaking air to the water intake port under the external reservoir. At the start of the brew cycle (after the internal tank is topped off), I now need to quickly remove the external reservoir, and block off the water intake port under AND the air vent above the reservoir. Then all the air from the pump goes through the k-cup and I also get the burst of air at the end. The path to the water intake port is now stealing enough air, that it prevents the brew cycle from completing as it should. Maybe I need to replace both solenoids.
melman
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby melman » Wed Jun 29, 2016 12:19 pm

Per M.J. Flynn's diagram, if the Aft solenoid is open during the brew cycle, then air can pass to the overflow tube in the top of the external reservoir, and also through the water pump into the bottom of the external reservoir.
melman
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby GetSet » Sun Jul 03, 2016 10:08 pm

Yes, you're right it could. If both the aft valve is stuck open and you block the overflow tube at the same time, that could happen. I don't recall that it did last time the aft valve got stuck in my case, but it certainly could happen and that is probably it.

By the way: In the diagram, the two lines outputting from the water pump really just tee together. The water pump just has the tee built in for convenience.
GetSet
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby Copytechman » Thu Sep 08, 2016 7:42 am

Noob here! I have a b70 that is doing something I haven't seen mentioned in the 23 (awesome) pages I read! It pumps water in fine but when it goes to brew the water comes back up thru the bottom of the reservoir! Check valves? It has the dual valves as it was one of last I bought as the v2.0 was released. The air pump seems to work great at giving me about 4 Oz while pumping the rest back into the bottom the res, water doesn't come thru the two return hoses @ the top like many others have mentioned with the failure of one of the solenoids.

Help? Lol! Gonna call keurig Canada too, it's maybe 2 yrs old, about the age when the new style keurigs were released.

Regards!

A!
Copytechman
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby GetSet » Tue Sep 13, 2016 1:26 pm

Hey, sorry I missed your post. Looking at EmJayEff's diagram in his Theory of Operation document, it could be a check valve (the one at the water pump), like you say. The nice thing about these valves is that you could actually access them somewhat from the bottom just by removing the bottom cover plate, disconnecting the hose to it from the water pump, and maybe clean them out with a long Q-tip. This wouldn't require the hassle of removing the whole outer casing. It also could be that the forward solenoid valve is stuck open (it should be closed when brewing). If so, then this would furnish a path to return water back through the bottom of the reservoir. The aft valve is probably closed like it should be, otherwise you wouldn't get any brewing action at all.
GetSet
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby Copytechman » Wed Sep 21, 2016 5:28 pm

Awesome thx, check valves, it has 2, ran vinegar and yuck, but now it's working properly again! Thanks so much!

Regards!
Copytechman
 
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Re: Dissassembly + Repair Guide - Keurig B70 Platinum

Postby Mindpower » Wed Jun 14, 2017 11:47 am

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