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