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Replace a new circuit board and batteries of a Braun 7526 shaver?

What is the step by step process of opening/splitting the case and replacing the circuit board and batteries of a Braun model 7526 shaver?

Thank You,

Fred Tripp

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Re-design7 years ago
Is the shaver similar to this?

You can probably find replacements for the batteries but I don't think you will be able to find a replacement for the circuit board.

Still, good luck.
There are aftermarket circuit boards available. But, for the prices they are charging, it's not very cost effective. I'd rather just buy another shaver. The 7000 series is OK, but the 8000 series is better. I've been able to buy the 8595 and 8995 top models used but in very good condition for around $50 each. Given how the circuitboards tend to sell for around $40, it's a no-brainer to me about upgrading.

However, if you don't want to spend that much, going the battery replacement route is the cheapest (like $2.50 per battery). Keep in mind that success isn't always guaranteed. I had one shaver that never worked right after the battery change, but another that was fine.
lemonie7 years ago
If Braun are sending you that I'd expect them to send instructions with them (wait until they arrive). Otherwise you can download the user manual from the same site.

L
Fred Tripp (author)  lemonie7 years ago
Once again...the Batteries come along w/the Circuit Board, they are connected.  I'll be recieving the unit, but not from Braun and I'm almost positive No directions will be with the package.  What I need to know "is how to replace the batteries" that are attached to the Circuit Board...HOW TO INSTALL...Thanks
I assume that by this point you've figured it out, as it's been 1 1/2 years since you posted... but just in case you didn't, and you put the thing on a shelf for later, here's what to do:

First, you should not remove the batteries from the circuit board. You will use the entire replacement part as is, swapping it in for the existing circuit board. To get the case open, you pry off the AC socket surround. The best way to do this is to insert a thin but sturdy wooden stick part way into the socket, just enough to get a grip on the surround. Then use leverage to pry it off. You could also use a screwdriver, but be careful not to damage the plastic. As you apply pressure, you'll see that there are 4 inner hooks on that surround, one near each corner of it. I find it best to pull straight down, so you disengage 2 hooks on one side first. The piece will come out easily after that. If you're having difficulty, have a toothpick on hand to stick into the gap you create. You can then use your fingernail to help pry it off.

OK, that's a lot of info about removing that surround, but once done the rest is very easy. The two rubber treated side pieces come off quite easily now. Once they are removed you will see that there are 4 screws holding the shaver body together. From there, you'll be able to get into the internals. Just do it cautiously, observing how everything fits together. If I remember correctly, there is a lever mechanism used for controlling the head position (either swivel or fixed). Be sure that you re-attach it in the right way afterward, or else you may find that the head won't lock into place after reassembly.

By the way, I've experimented with replacing the batteries only. If you hunt around enough, you can find some that appear to be very close to the specs of the originals, for a lot less than a new circuit board. But you know what? The circuitry is sensitive to the mAh rating of the batteries. If there's too much of a deviation, the shaver won't charge properly. All in all, it's a big hassle. If you're good with soldering, pay a little more and get the batteries specifically sold for this shaver. Otherwise, it is best to do what you've done, which is to buy the replacement circuit board. But better yet... the 7000 series Braun shavers are OK, but not as good as the 8000 and 9000 series. I wouldn't bother replacing the batteries and just go with a newer model. 
I have a Braun 7526 (type 5493). After doing some research on the Internet, it seems that the batteries are NiMH, not NiCd. The size is AA and they are flat top, not button top.

After reading your comments and others, it seems that using a mAh rating of over 1600 is too much for the charging circuitry. What would you recommend? (600, 1100, 1300, 1600)?

Also, should I un-solder the existing batteries and re-solder new flat top batteries to the tabs, or should I buy flat top batteries with tabs and solder to the circuit board? I appreciate your help!

I found a couple of good battery websites here:
http://www.batterystation.com/nicads.htm
http://www.apexbattery.com/alkaline--nimh--nicad-batteries-specialty.html
A size AA NiMH battery with mAh between 1100-1650 is recommended. I believe the originals were 1100mAh. I tried 2200mAh and it didn't work right.

As for tabs or no tabs, it depends upon how good you are with soldering. If you're not confident about completely removing the tabs from the circuit board, I suggest getting the batteries without the tabs. What you do is separate the original batteries from their tabs, leaving them soldered in the circuit board. Then you just solder the new batteries in place. HOWEVER, you need to be sure you don't heat up the battery ends for too long, in case it affects the chemical composition of the batteries near the tips. A good technique is to "tin" the ends first. You clean and score the battery ends, then blob some solder onto them. When you then go to solder on the tabs, you don't have to worry about the coverage of the solder on the battery side, just the tabs.

BatteryStation tends to be a little pricey. ApexBattery doesn't seem to carry the right ones.
I bought mine from MDBattery, but they're out of stock. Here's a possible substitute:
http://store.batteriesamerica.com/hr-aausanyo-brandrechargeableni-mhaacell-1650mahcapacity-flattopstyle.aspx
Did you download the user manual, and was it any use? Are there any screws, visible or hidden under stickers?

L
lemonie7 years ago
I wouldn't expect Braun to stock circuit boards, but if they do look here:
www.service.braun.com/

L