how to test relay from jbl amplifier?

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craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 26, 2009 at 4:53 PM / IP Logged

None are reading near zero, the 540s are showing 1222.

When it was buzzing, they were showing 030.

i am an idiot

Platinum - Posts: 13,714

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 26, 2009 at 5:29 PM / IP Logged

It is rare for them to short from leg 1 to leg 3. But it does happen. You will have to remove those 2 to test them further. To remove them, heat the joints up and add extra solder to all 3 joints on each part. Now lay your iron across all 3 joints and the transistor should fall out of the board. If it does not fall out, use some small pliers and gently pull the part out of the board. The pliers are only so you do not burn your fingers. Do not force them out with the pliers. Check them again from left leg to right leg. Let me know what you find out.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 26, 2009 at 5:56 PM / IP Logged

removed the 2 540s and checked leg 1 & 3 no buzzer, meter stayed showing 1.

I also removed the 2 resistors and they did not buzz either.

The funny thing is that i checked the joints that the transistors and resistors came out of and they made the multimeter buzz.

Any idas?

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 26, 2009 at 6:12 PM / IP Logged

Check the transistors on the other side of the board the same way.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 26, 2009 at 6:17 PM / IP Logged

same readings

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 26, 2009 at 7:19 PM / IP Logged

Are you sure that they are IRF-540 or IRF-9540? The rectifier diodes will read like that when in circuit. If they are 540 or 9540, remove them and test out of circuit.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 12:07 PM / IP Logged

They are definately IRF 540 and IRF 9540.

With the black lead on the metal body if you then touch the right leg you get a reading,if you then touch the left leg the meter stays showing 1.

If you then touch the right leg again the buzzer sounds.

This happens on both transistors.

If you leave them for a couple of minutes the same as above happens.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 12:16 PM / IP Logged

how to test relay from jbl amplifier? - Page 3 -- posted image.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 12:17 PM / IP Logged

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2009 at 3:24 PM / IP Logged

That is how they are supposed to work. Once you touch the lead to the left leg, you turn the transistor on. It will remain on until you turn it off by holding the red lead to the case and touching the black lead to the left leg. You stated that from left leg to right leg it read .030, what happened with that? Chack the board from left hole to right hole. I can tell nothing by learning of a buzz from your meter. I need to know numbers from here on out.

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