Two Days, One Fault, and a 12-Bed ICU Monitoring System.
<
This is *NOT* a “4 lessons I learned from blah blah blah” kind of post.
This is a plain story. There is no world-shattering
wisdom here.
If you find a takeaway, it is at your own risk.
/>
At 2 AM on an empty road in Ahmedabad, I was walking back from a hospital with a brand-new 12-bed ICU monitoring system that refused to work.
I had just completed my B.Sc. in Physics and Electronic Instrumentation. Within days, I landed my first job—and I was thrilled. It was with a renowned company in medical instrumentation, number one in ECG machines, DC defibrillators, ICU monitoring systems, and more.
They took me in as a Service Engineer. My job: repair those machines. Chip-level debugging and repairs. Using an oscilloscope to study the circuitry, figure out why an ECG machine wasn’t working, then with a soldering iron yank out the faulty chip, resistor, capacitor—whatever it was—and watch the machine come back to life. Fit to monitor a heart patient. That joy was beyond words. I wonder how many will even understand today what “chip-level” means. Anyway.
Because of this job, I got to know many surgeons and heart specialists. It was a very, very satisfying job. This story is about one day that turned out to be both my most frustrating and my most satisfying.
I was working in Mumbai when we received an order for a 12-bed centralized ICU monitoring system from a civil hospital in Ahmedabad. We had supplied many 4 and 8-bed systems—our standard models. This being a municipal hospital, their ICU was quite large. The 12-bed monitoring system was custom-designed, and I was looking forward to commissioning it.
Eventually, the big system reached the Ahmedabad hospital from Bangalore, and so did I from Mumbai. I carefully installed all 12 bedside monitors—smooth work.
Then came the centralized monitoring
system, where a doctor is present round the clock.
The system had come brand new from the
factory in Bangalore, polish still shining. It should have worked flawlessly.
But the system disagreed. For two days I struggled with bed-to-system wiring.
No luck.
At the end of the second day, I decided to open it up and start monitoring the monitoring system itself. Luckily, I had brought my beloved Tektronix oscilloscope, even though this was supposed to be a straightforward installation of a brand-new system. It was a dual-trace oscilloscope, with a 4-second memory—you could even freeze the scope to study a waveform closely. It was my prized possession, though it belonged to my company.
That oscilloscope was my eyes and ears. With it on my desk, I felt confident—the way a soccer player feels stepping onto the field in his favorite shoes.
Luckily, the Bangalore factory had sent me
the circuit diagram. Because it was a custom-built system, they wanted to play
safe. Armed with the diagram and the oscilloscope, I started my quiet
conversation with the anatomy of that 12-bed monitoring system.
Around 11 at night, I saw a flicker of a problem. I say “flicker” because at first I wasn’t willing to believe my eyes—or my oscilloscope. One small capacitor (I’ve forgotten its µF value now) was shorted. Simply shorted. And that tiny fault was making the entire downstream circuit null and void.
Just a couple of weeks earlier, the entire system had been built in Bangalore. I’m sure it must have been tested. I say “I’m sure” because in that moment, I was extremely angry, blaming people in the Bangalore factory.
Today, I see that differently. A capacitor failing was simply a statistical event—a very unlikely one, perhaps, but still possible.
It was past 1 AM. I packed up the open-heart surgery I’d performed on my monitoring system. The nurses and doctors around me were curious to see the internals. They were considerate, too. At 2 AM, I started walking back to my hotel.
The roads were completely empty. I was burning with anger inside, but I had a strong feeling that the problem had been located. Now it was just a matter of replacing that capacitor. The proof, of course, would come only after the replacement.
The next morning, I asked my taxi driver to
take me to an electronics spare-parts shop. Luckily, he knew an area with
hundreds of shops selling all kinds of electronic equipment, kits, and
components. I bought the required capacitor. I still remember the shopkeeper
telling me that I must buy a packet of 50 capacitors. So, I bought that packet
of 50.
I knew in my heart that only one of these
50 would work the magic and bring that 12-bed ICU monitoring system to life.
But if my diagnosis was wrong, all 50 would be useless.
Within an hour, I was back at the hospital. I walked into the ICU, plugged in my soldering iron, and replaced that capacitor.
And without any more fuss—like a class of
12 disciplined boys—the system started displaying 12 traces, exactly matching
the 12 bedside monitors.
The joy, the satisfaction, the anger, the
relief, the sense of achievement—it was all beyond words.
The nurses around me were happy to see me
happy. “What was the problem?” they asked.
I showed them the faulty capacitor—about a
quarter the size of a thumbnail.
They looked a bit puzzled.
Maybe they were wondering… all that two-day
drama, just for this?
—No CPUs/GPUs were harmed in the writing of
this blog—
