how to test relay from jbl amplifier?

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craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 19, 2009 at 5:18 PM / IP Logged

Can anyone tell me how to test this relay, it came out of a jbl amplifier.

Thanks.

Craig.

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

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 19, 2009 at 5:19 PM / IP Logged

another picture.

i am an idiot

Platinum - Posts: 13,709

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 19, 2009 at 5:40 PM / IP Logged

Using an Ohm meter, one of the larger terminals will be connected directly to another of the larger terminals. See the 2 smaller terminals with the squiggly line connecting them? Those are the coil of the relay. Apply 12 volts to one and ground to the other and it should make a clicking sound. remove one wire and it should click again. With it energized, The third larger terminal should now be connected to one of the 2 that were connected earlier. Whichever one is now connected to the 3rd one is the common connection. The 3rd terminal is the normally open connection. Tho only other one left is the normally closed connection.

Those relays are extremely reliable. Why do you think it is bad? What exactly is the amp doing or not doing to lead you to believe it is broken?

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: April 19, 2009 at 7:17 PM / IP Logged

The shape's wrong but it's a standard configuration with the top right as 87, top left as 87a and centre bottom is 30. Sanyou?

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 20, 2009 at 4:54 PM / IP Logged

Originally the amp blew 2 caps which i replaced but the amp is still in safe mode and i suppose i am clutching at straws.

The blown caps were at position c102 and c108. Since these photos were taken i took out the ceramic ones and put in the correct ones.

Any ideas guys?

Craig.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 20, 2009 at 4:55 PM / IP Logged

i am an idiot

Platinum - Posts: 13,709

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 20, 2009 at 5:28 PM / IP Logged

Chances are you have shorted output transistors. Can you take a photo of the entire circuit board so I can show you where the output transistors are located.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 23, 2009 at 3:14 PM / IP Logged

Here are a couple of photos:

i am an idiot

Platinum - Posts: 13,709

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 23, 2009 at 4:30 PM / IP Logged

transistors on the left side of the amp. What are the numbers on them? The 7 at top of picture. The 4 at the bottom of the picture.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 23, 2009 at 5:48 PM / IP Logged

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