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Repair your calculator during the lock down!


Now we are locked down due to the Coronavirus global pandemics - and it is likely that we'll have to stay for at least a couple of weeks. Now is the time to start things that we didn't have time in the past to do.

DSC_7337One thing is to fix everything that doesn't work at home - and probably this includes your old calculator.

I have started to repair calculators only recently. The repairs performed were increasingly complicated, but at the end I got Ignacio Sanchez's help and we designed a series of parts that help us in these repairs. But the first you need to do is the diagnostic of the damage.

During the next days we will discuss how to repair yours. However, my goal for this instalment is to make you believe that your calculator can be repaired. In my experience , 90% of HP41c calculators can be repaired - and I'd say that 70% are really easy to repair. And this means that YOU can repair it. 

Even very destroyed calculators are repairable. Curiously, the worst calculators to repair do not show any damage. In many cases users put the wrong battery model and burn the calculator with much higher voltage than needed (for example, put four a23 batteries (12v * 4 = 48v) instead of the 6v that are produced by four 1.5v LR1 batteries. Then the screen is burned and then you need to wait for a donor calculator - something that doesn't happen quite often.

But for the rest of the repairs, there is a solution!

We'll look into it in the following blog issues.

Comments: 1
More about: HP 41c repair

Comments: 1

Martin Macrae |
HP41CV cleaning the display internally.
Just completed repairing a HP41CV, Replaced the Battery terminals with the 3D printed one. A little thing was the dust and tiny particles that have drifted inside the display, between the LCD and transparent plastic cover. I didn't want to have to dismantle to clean this so I tried using a hand held DYSON V7 with the small tube supplied to suck the particles out. It has an IMMENSE amount of suck and pulled all the particles out. looks like new.
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