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Photo blurry but requires an input of 18.5v @ 2A....whether ac or dc is not clear....it shows which goes to which pin but as I said.blurry.
Measure inner pin diameter for correct size....usually use vernier caliper
Test for what...it's a power input....Well I'm wondering without the proper adapter how you test these. Trying to avoid buying the adapter to test it. No trick to do this?
If I understand you correctly then you have a power SUPPLY that has inter-changeable tips. It's possible to fit these tips in one of two directions (for positive-pin or negative-pin - centre-pin that is) and it's often confusing to tell which is which.
As a result I always use a test meter to double-check as getting it wrong can often be catastrophic.
Obviously DC as indicated by ===. Sleeve (outer) = -, tip (inner) = +whether ac or dc is not clear.
I did thanksno you risk shorting it, opening it is the safest option or just buy the multi adapter tool thingy off of places like ebay