Electronics > Beginners

Actuator repair attempt

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Gallardo:
You can try to short the multimeter's test leads, determine the resistance of the multimeter itself, and then use a multimeter to measure other circuits. The last displayed resistance value is subtracted from the multimeter's own resistance value, which is correct.

qkcam:
i checked the multimeter with other circuits and it's fine.  so this has to do with what I am testing on the actuator and not knowing what I am doing.

maybe I am testing the wrong part of the coil ? 
so many questions.   

james_s:
Never grease the plunger in a solenoid, they are designed to run dry. I've seen people grease pinball flipper solenoid plungers and it gums everything up, then the grease picks up all the crud and becomes abrasive paste.

Gregg:
To check the circuit:
1.   First start with a sanity check by shorting out your meter leads in ohms mode.  Note the resistance of the leads; it should be less than 0.5 ohm.  Try wiggling the connections to see if you get a better connection and if you can’t get a consistent reading, you might have to replace your test leads.
2.   I have numbered the test points on your two pictures; start with the resistance between points 1 and 2; continue with points 2 to 3 etc.  All of the test pairs except 3 to 4 should be very close to your sanity check reading
3.   Points 3 to 4 are the coil resistance. If this is open circuit you have a real problem; if it is close to the expected resistance, then the entire circuit , points 1 to 6 should be within 1 ohm of the coil resistance as read on your meter.

qkcam:
This is great Gregg thank you~! 
what are those grey tabs at 3 and 4? I accidentally broke one of them off when I was trying to pull the connectors out of the coil so I could put the wires in and re-insert with a good tight connection. 

the multimeter is a loan from the tool library and I dont have other leads for it.  will give all these cool tests a go tomorrow.  didnt have a chance to do anything today.   will report back.   thanks alot for the help and the lesson!

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