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Electronic Blood Pressure Tester Repaired
My older niece came to me because she is pregnant, her blood pressure is rather high ultimately and her Electronic Blood Pressure Tester was fully dead. She was sincere with me and confessed two batteries exploded and she opened up the device, but she is green when it comes to electronics.
The device is brand CVS, model 271243 (3BW1-H) China made.
First thing done was to open up the device, a piece of cake: only two screws and some plastic clips.
The first trouble seen was a black wire dis-connected (supply of the little motor) shown in the image below. Of course it was not the main cause of death of this Blood Pressure Tester.
The cable was re-soldered, and of course the device remained dead. The PCB was extracted and there were some lines darker than normal, due to acid of the exploded batteries. The lines were re-built with a thin wire of copper, as shown in the images below:
When the device was put into functioning, it remained dead, but there was an interesting fact: the four batteries supplied 6 volt (1.5 volt * 4), and know what? A lower voltage was supplying the circuit; therefore I decided to change both cables from the batteries to the PCB (sorry, I forgot to take a picture). Two pieces of cables in good conditions were re-soldered but the device with o life signs yet.
The other step was to check up the ON/OFF START micro-switch and it was in bad conditions. Another one was adapted and look at the result in the photos below:
Wow! The device came back to life, I was very happy because my niece could check her blood pressure at any time with her device. The image below shows the parts in bad conditions.
Another device saved from the dump.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
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