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Author Topic: DC44 Battery/body issue  (Read 280 times)

Offline matrixresonator

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DC44 Battery/body issue
« on: October 09, 2018, 12:50:23 PM »
Got a DC44 in for repair which is dead (charger is good)

Fitted a new battery still dead.

Fitted the new battery to a new body I have on shelf, as well as others I have in for repair and still dead (wierd)

Tried a battery from another machine on the one im repairing and still nothing.
Now this battery won't work on any machine.

I'm presuming theres a fault with the machine thats killing batteries, anyone else had this??


Online MVacs

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Re: DC44 Battery/body issue
« Reply #1 on: October 11, 2018, 06:32:39 PM »
I'm presuming theres a fault with the machine thats killing batteries, anyone else had this??

Yes, it happens from time to time. Occasionally a faulty main unit kills a new battery the moment its connected.

Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #2 on: October 11, 2018, 10:51:21 PM »
damn, guess I just fried 3 batteries lol

Was hoping there would be a way to some home Ďresetí the battery

Online ryevac

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Re: DC44 Battery/body issue
« Reply #3 on: October 12, 2018, 01:10:19 AM »
sounds like there could be a dead short on the main hand unit.
The battery internal pcb must have a fuse by the sound of it, the other models batteries i have cracked open had a surface mount fuse on the pcb.

I heard of this issue, but a long time ago, this thread helped me recall it.

Would be interesting to break open a faulty hand unit in this condition and have a probe about, (and if it has the two long connectors in the handle when battery is removed) - does it read short or very low resistance on the ohm meter ?
If it was assembled it can be disassembled - if we can't repair it then it probably isn't worth repairing !


Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #4 on: October 12, 2018, 11:06:25 AM »
Just tested all the good main united I have, the long probes give a reading for a split second then read open circuit after that.
The faulty main unit gives a permanent reading of closed circuit (about 1ohm)

As soon as the customer gives me the ok to scrap the units i've rip them apart and check the battery for a blown fuse.

Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #5 on: October 12, 2018, 11:50:43 AM »
Managed to open up a battery, will go back together but will look a bit messy.

Inside the battery is outputting the correct voltage, but along the black cable is a small fuse (says 15A I think) that has blown.

So before replacing a battery test the long prongs on the body to make sure itís not OC!

Will try get hold of another fuse and test this battery when I get chance, prob wonít be till next week now.

Some photos I took here:

ila_rendered

ila_rendered

Online ryevac

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Re: DC44 Battery/body issue
« Reply #6 on: October 12, 2018, 01:48:31 PM »
Good work.

Oh yes just spotted it, in green body.
the earlier model batteries had a fuse on the pcb i think.

Well that proves a point, that the main unit has failed, one to avoid in future !
Thanks for taking the time to reveal this, as it happens i have a dc34 with exactly same problem, i haven't got the right to crack it open yet but may do in the future. I purchased an aftermarket battery to try and still dead.

problem is with these units / batteries is any attempt to open up leaves them looking like they have been chewed by a wild dog. A lot of heat on the casings helps as well as plastic spudging tools.
I now refuse to take any dyson cordless on, unless it is reported working and just requires deep cleaning and filter.
If it was assembled it can be disassembled - if we can't repair it then it probably isn't worth repairing !

Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #7 on: October 12, 2018, 02:01:30 PM »
Iíve got a pile of 4 batteries that I tried on the faulty unit before we realised what was happening, I can experiment with ways to take them apart as Iíve nothing to lose with them!

Online ryevac

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Re: DC44 Battery/body issue
« Reply #8 on: October 12, 2018, 03:38:49 PM »
 :icon_nod:
If it was assembled it can be disassembled - if we can't repair it then it probably isn't worth repairing !

Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #9 on: October 12, 2018, 03:54:16 PM »
Nobody in the area has any inline fuses, so I used the only other thing I could get my hands on which was a car fuse.

Fitted it and reassembled and machine working just fine.

Doesn't look as bad as the pics show, and i'm sure being a bit more careful and with better technique it could look much better!

ila_rendered

ila_rendered

Online ryevac

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Re: DC44 Battery/body issue
« Reply #10 on: October 12, 2018, 04:30:24 PM »
Good stuff, get that old hand unit cracked open if possible in future once written off, and interesting to see where the s/c is.
I reckon a s/c power diode or fet, not a small component as that wouldn't take out a 15a fuse logically.
If it was assembled it can be disassembled - if we can't repair it then it probably isn't worth repairing !

Offline matrixresonator

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Re: DC44 Battery/body issue
« Reply #11 on: October 15, 2018, 11:14:43 AM »
Found these online which look to be about the right thing if anyone else fancies repairing a dudd battery:

https://uk.farnell.com/littelfuse/0251015-mrt1l/fuse-quick-blow-15a/dp/9922059

Online ryevac

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Re: DC44 Battery/body issue
« Reply #12 on: October 15, 2018, 12:55:18 PM »
 :thumbsup:
If it was assembled it can be disassembled - if we can't repair it then it probably isn't worth repairing !

 

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