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Terella 13/06/2018
The replacement microcontroller arrived in about 3 weeks from order. Current firmware version is 1.12. Replacing the IC required the removal of the display from the multi-function tester. Apart from this and the need to slightly bend inwards the two rows of pins, the installation was straightforward. The calibration process (shorting the 3 input pins and then following the instructions on the display) took about 1 minute. Lesson learnt: before testing any electrolytic capacitor, it is essential to fully discharge it by shorting the leads with a ~1K resistor in order to avoid destroying the microprocessor chip, in case a residual charge is left in the capacitor.
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