Sunday, June 19, 2016

N2 % RPM Indicator

This time I'm analyzing a N2 RPM indicator from a former 737-300.
This unit is working in a similar way than the N1 indicator that was reviewed in a previous post.

The Unit...

Brand: Smith Industries
PN: WL202EED4


The pinout...

After analyzing the important boards inside, I could take this notes:


Pretty simple to wire it, right?

Test of the unit...

In normal operation should look like this:


During the BITE test:


Applying pulses with a frequency range between 90 Hz and 2.78 KHz, produces this result:

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