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BRAUN Wrist Blood Pressure Monitor & Tester Of Heart Rate Counter Repaired

By Jestine Yong on June 10, 2019

I received this machine from an old lady with the complaint that it was not working properly.

First I tried to test my own blood pressure, I installed the machine over my wrist and pushed the start button the machine start to inflate the balloon over my wrist by sending the air and try to stop the stream of blood inside my vessel but failed and stopped and the EEROR appeared on the screen

This machine was given services to owner at least 6 years and by my experience electronic machines older than 5 years are suspect to cool joints and due to passing the time the solder crystalize and does not make a good contact with other parts. then I decided to reflow major parts on the pcb. But what is reflow? watch this
video(https://www.youtube.com/watch?v=eOUf59iut3s) .I opened the machine by three screws

I started to reflow the big ic and other neighbor. after reflowing I tried to turn on the machine and asked to determine my blood pressure but no progress!! The machine failed again. this does not mean the big ic did not need reflowing but may be means that machine is faced with multiple problems!

machine gave ERROR and left incomplete the job of pumping the air to the wrist balloon to stop the flow of blood inside of my vessel and then by deflation of air restart to count the heart rate pulsing. but I feel that the air that is pumping with air pump is coming out of the system somewhere!

I decided to open other mechanical parts in more depth of the machine under the lcd display.

I discovered that the air pipe that is responsible to bringing the air pressure to the wrist band balloon is punctured and/ or deflate and the pressure of air pump does not rich that much to satisfy the sensors to trigger the micro to continue the program of machine and start to count the blood pressure of the person that is under the test cos air is coming out of the system! yes the air pipe was torn yes this was the main problem of this machine. for repair

I tried to find such air pipe in the market but I found not exactly for this brand but what I found was good enough to match to this machine I replaced the old and broken air pipes with this new one after that the machine returned backed to normal job again and rescued. I test my own blood pressure and it was in normal tolerances and machine was working good and old lady also was happy too

Thousands machines like this one are waiting to receive such services in the world and with small efforts are repairable. The cost of this repair was just 50 cents.

Note 1: I used the hot air gun GORDAK 952 for reflowing of big ices.

Note 2: first the own air pipe of the machine looked good but when I touched it by my hand destroyed and felt on the table.

This article was prepared for you by Mr Beh from Iran

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Note: You may check out his previous repair articles in the below link:

https://jestineyong.com/kd-120-12-power-supply-repaired-replaced-few-bad-components/

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Blood Pressure Monitor Repair

23 Comments

Parasuraman Subramanian

June 10, 2019 at 9:55 pm

A good and informative article with a great service done!

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- beh
  
  June 11, 2019 at 3:33 pm
  
  Thank you so much.
  
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Albert van Bemmelen

June 10, 2019 at 10:18 pm

A professional repair Beh!, but sadly not always as easy on these blood pressure machines as in this case. Most of the time it is the motor or something else mechanical that needs fixing too. I'm glad that your English is much better than my Arabic or Persian writing. I guess you must have been very busy with repairs to have had little time to check on the spelling (;). By-the-way: Many older people buy these blood and other testers but since they can deviate upto about 20% tolerance from the real values from those the doctor uses I do not bother to buy these devices myself. (Also because my blood pressure miraculously never is bad although other health issues need improvement).

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- beh
  
  June 11, 2019 at 3:44 pm
  
  For me was the first time i opened such machine and .yes i am lucky that the problem was just the air pipes . i will thankful of you if you send me info s about the air motor pumps of this blood pressure monitor. Doctor es are not available always every where to measure the blood pressures of people these machines are better than nothing but the person that is using this machine must be aware of this tolerances & thanks for your supports
  
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  - Albert van Bemmelen
    
    June 12, 2019 at 12:01 am
    
    If I find info on those motors, or on other components I will let you know Beh. The last time I checked the blood pressure meter of my brother it was beyond repair. As were some other very cheap meters to measure body temperature that were too complex to fix. With no replacement components and no datasheets at hand they are close to impossible to fix.
    
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Robert Calk Jr.

June 11, 2019 at 12:20 am

Good job, Beh!

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- beh
  
  June 11, 2019 at 3:46 pm
  
  Thanks ROBERT.
  
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Mark

June 11, 2019 at 6:21 am

Good job Beh. Sometimes there are several faults, which can be frustrating because you carry out one repair only to find another.

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- beh
  
  June 11, 2019 at 3:48 pm
  
  yes i am lucky this time & Thanks
  
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Yogesh Panchal

June 11, 2019 at 3:44 pm

Good Job! Beh

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- beh
  
  June 11, 2019 at 7:13 pm
  
  Thanks Yogesh.
  
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Yogesh Panchal

June 11, 2019 at 4:14 pm

Good Job! Beh

In automation system out of the Box Knowledge is also required.

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Waleed Rishmawi

June 11, 2019 at 4:26 pm

good repair work. yes I had issues like this before but the faulty part was the motor itself. it is still sitting on my shelf because there is not working motor to fit the device.

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beh

June 11, 2019 at 7:14 pm

What is problem of motor?

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- Waleed Rishmawi
  
  June 14, 2019 at 5:16 pm
  
  Beh: although it has power to it, it is not running
  
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  - beh
    
    June 26, 2019 at 5:18 pm
    
    As long as you open the motor you will see the problem with your eyes.if not then check the wire windings and so and so. at most, the type of motor must be verified is obtainable via the net? or not? if so is it economically to buy a new motor or not?
    
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Ghashaan

June 12, 2019 at 3:38 am

A leaky pipe! Not exactly an electronics problem. But that's part of the job that makes it somewhat interesting. The problem could turn out to be anything and the solution could be simpler than we expect. Thanks for the article, Beh!

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- beh
  
  June 12, 2019 at 11:11 pm
  
  thanks GHASHAAN.
  
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GIFT ELIJAH ELIJAH

June 12, 2019 at 8:31 am

Good job

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- beh
  
  June 12, 2019 at 11:12 pm
  
  thanks GHASHAAN.
  
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- BEH
  
  June 12, 2019 at 11:13 pm
  
  THANK YOU.
  
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jai etwaroo

June 29, 2019 at 3:05 am

Good job Beh

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- beh
  
  July 6, 2019 at 10:38 pm
  
  THANKYOU
  
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