How do i check speaker ohm from this digital multimeter

[kevinkhan]

Im new to electronics and dont have a clue how to use a multimeter

this is the one i have
**broken link removed**

Would appreciate any help provided

Thanks

 

[birdman0_o]

Set it to the 200 Ω setting !

 

[kevinkhan]

Set it to the 200 Ω setting !

Can you explain why it should be this setting? and what ports do i use, the 10 ADC COM or V ohm mA

Thanks for your help

 

[birdman0_o]

put one probe into com and one into V ohm mA. You are finding the resistance of the speaker

 

[kevinkhan]

Set it to the 200 Ω setting !

put one probe into com and one into V ohm mA. You are finding the resistance of the speaker

any ideas what part of the circuit board i can check if the correct ohms is going through it?

here is the circuit diagram of the speaker

https://www.electro-tech-online.com/custompdfs/2010/12/MRX515.pdf

 

[birdman0_o]

It's an 8 ohm speaker

"• Nominal Impedance: 8 Ohms"

Why you asking these questions anyways, it's not working?

 

[kevinkhan]

No theres a small sound coming out of the speaker but not what it sould be. I had the same problem with the other speaker a few weeks ago and took it to the repair shop and they said "one of the circuits was dry"
does this mean that one of the joints needs to be re soldered? and any ideas where i can go looking?

sorry i have no knowledge of circuits.

 

[birdman0_o]

Do different speakers work in your sound system?

 

[KeepItSimpleStupid]

A couple of things. A full range speaker has a crossover in it, It has a few components, notabley coils and non-polorized caps.

First, you need to swap speakers - this tells you that the speaker is the problem. Each speaker has a voice coil. checking the resistance of each voice coil with the crossover disconnected is at least a start. Making sure that the leads leading to the speaker have continuity is another. If the impedance is 8 ohms, the resistance will be somewhat lower,, say 6 ohms or so.

Large speakers can be tested with a 1.5 V battery. When a battery is attached to the voice coil with the proper polarity, the cone pushes out.

There can be internal fuses in a speaker enclosure too. Mine are behind the grill cloth and the speakers are removed after the cloth is removed.

Scratchyness is usually the result of a voice coil getting hot. The cone will have friction when depressed manually.

You can test each speaker individually at low power. The tweeters would be susceptable to damage at high power levels.

The surrounds could be damaged.

Check the crossover for bad connections. Capacitors in the crossover can be the cause of bad sound as well. These MUST be replaced with non-polarized caps of the proper voltage rating or higher.