Originally posted by Ron O I did the reset. I had already updated to the latest firmware. There is no short as indicated by the approximately 32 Ohm reading on the multimeter. As for testing for polarity, polarity is used on power supplies to determine positive and negative. There is no power on a solenoid by itself. The only way to make a solenoid work one way and not the other is for it to have a diode in line with it.
I'm sorry but this is very wrong!
This type of solenoid has 2 windings. If DC-voltage is applied to the 2 poles, it either enhances the magnetic force of the permanent magnet or it goes opposite, it cancels the magnetic force!
Originally posted by Ron O There is no diode in either of my solenoids as indicated by having the same reading no matter which post had positive or negative leads on it.
Sorry but this is also very wrong. There is no need for a diode. The solenoid gets a short impuls of DC (direct current) voltage of 6V - 7,2 Volts and thats it!
DC Voltage has polarity: +/-
Also what you say about polarity being used on powersupplies to determine positive and negative is wrong!
Powersupplies "supply power", and that can be as much AC = alternating current.
Powersupplies convert power to a desired power. There are also "switching powersupplies".
If you measure impendance, you don't measure + (plus) or - (minus) but you measure impedance! There are no plus/minus readings!
Impedance is ohm-resistance, which works both ways. I diode has complete different functions.
It is very simple and straight forward:
The solenoid has 2 poles (plunger facing downwards):
for the correct way this solenoid is meant to function, i.e. to release the plunger, it is:
Left (
pink wire):
plus
Right (
lilac wire):
minus
If you apply lets say 6Volts DC to it (
plus left,
minus right), you will immediately notice the plunger will fall down, because the 2 coils induce (induction) a magnetic field, which works opposite to that one from the permanent magnet.
But if you apply the same voltage but Plus DC5Volts to the right and Minus DC 5Volts to the left, the plunger holds even stronger, you need much more force to pull it out.
That is how it works and not to any single 0,00001 percent different!
Originally posted by Ron O I have worked in automotive electrical systems and computers and have repaired circuit boards, etc for over 30 years.
Then I don't understand why you believe all this you tried to explain here about the solenoid, because it is totally wrong.
Originally posted by Ron O The process of replacing the solenoid went smoothly, nothing fell into the camera and everything that worked when I took it apart worked when I put it back together. I have opened up the camera twice more to make sure nothing had gone bad.
Something must have gone wrong.
---------- Post added 04-11-19 at 12:12 AM ----------
Originally posted by slartibartfast01 There is a permanent magnet in the solenoid which does give it polarity.
Not quite because what is meant here is intentionally applied
electric polarity which one can measure in DC Volts (or alternating if it would be AC
but then polarity would switch/alternate lets say 60 times per second from plus to minus)
The permanent magnet has (magnetic) polarity (the magnetic equivalent of electric polarity) but you even can turn it around, it will still pull the plunger and not push it!
Attraction of repulsion would only work with 2 magnets because then their (magnetic) polarity will define this.
Here we have a desired pull towards the plunger and a desired cancelling of magnetic force but not polarity.
Polarity here defines if the force of this permanent magnet would be made stronger (not desired!) or is cancelled (desired).
Last edited by photogem; 04-11-2019 at 02:48 AM.