how to test relay from jbl amplifier?

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craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 5:07 PM / IP Logged

how to test relay from jbl amplifier? - Page 5 -- posted image.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 5:12 PM / IP Logged

brown,black,yellow,gold?

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 5:14 PM / IP Logged

looking at the blown up pictur it looks like a piece of ceramic is missing of the resistor?

i am an idiot

Platinum - Posts: 13,714

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2009 at 5:58 PM / IP Logged

That is a 100,000 Ohm resistor. Brown = 1 Black = 0 Yellow = the number of 0s to put on the end. Yellow =4 1 0 0000 = 100K ohms. I am sure it is fine, it was reading 98 so I assume that it is 98,000 ohms.

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2009 at 6:03 PM / IP Logged

Are you sure the third band is yellow? That resistor looks damaged, in order to damage a 100K ohm resistor, there would have to be way more voltage than that amp is capable of producing. Is that resistor connected to the left leg of the transistor?

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 27, 2009 at 6:11 PM / IP Logged

Yes, just checked the schematic and it is indeed a 100k Ohm resistor.

On one of the transistors the left leg is cracked so i think i will get 4 new ones and put them in the board, then hopefully you can advise on where to look next. If you dont mind of course.

Its getting late here now, just after midnight, so i think its time for bed.

Will be on again tomorrow, catch you then?

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2009 at 7:18 PM / IP Logged

If the left leg of one of the transistors is broken, that is your problem. The transistor is turning on and the amp thinks it is shorted. That is why it is in protect.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 28, 2009 at 8:13 AM / IP Logged

Fitted new transistors and refitted resistor, put everything back together, connected to power source including remote and proection lights still on.

Does it make a difference as i have just connected +ive and remote to car battery on bench?

I have not connected phonos, speaker wires.

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 28, 2009 at 8:26 AM / IP Logged

craig155

Member - Posts: 37

Joined: April 19, 2009

Location: United Kingdom

Posted: April 28, 2009 at 8:28 AM / IP Logged

the above picture shows the new transistors and the old resistor before it was replaced.

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