No woofer output

[macddmac]

I finally got around to putting my Usher UA 721's together and the there's no woofer output on one of the speakers.
Removed the lower driver and and woofer board, checked all connections and ohm'd out and found an open between input + side and output.
Drivers checked good with a battery.
Good speaker sounds fabulous
All components on the the board show continuity when going direct to output lugs.
Bummed, time to email Parts Express support.

 

[TLS Guy]

I finally got around to putting my Usher UA 721's together and the there's no woofer output on one of the speakers.
Removed the lower driver and and woofer board, checked all connections and ohm'd out and found an open between input + side and output.
Drivers checked good with a battery.
Good speaker sounds fabulous
All components on the the board show continuity when going direct to output lugs.
Bummed, time to email Parts Express support.View attachment 15972

Then you obviously have a dry joint between the input lug and L1.

 

[macddmac]

Thx, I figured as much- problem is, they have so much goop between the pcb and hardboard, that fixing it myself is going to be ugly

 

[TLS Guy]

Thx, I figured as much- problem is, they have so much goop between the pcb and hardboard, that fixing it myself is going to be ugly

You should be able to scrape it off with a razor blade. The most likely cause is that an idle employee, did not scrape off the enamel insulation on the inductor lead, and just soldered over the enamel and got a dry joint.

Free up and unsolder the connection to L1 and the input tap. Then scrape off the enamel with a sharp razor blade, until you see bright shiny copper. Then re solder using lots of heat.

 

[macddmac]

You should be able to scrape it off with a razor blade. The most likely cause is that an idle employee, did not scrape off the enamel insulation on the inductor lead, and just soldered over the enamel and got a dry joint.

Free up and unsolder the connection to L1 and the input tap. Then scrape off the enamel with a sharp razor blade, until you see bright shiny copper. Then re solder using lots of heat.

Just like you said, thanks!
Fixed it- Wow, these sound good

 

[TLS Guy]

Just like you said, thanks!
Fixed it- Wow, these sound good

I was able to help you, because you gave such clear and precise details of the problem. Because of that, I was able to tell you with certainty what the problem was and how to fix it.

So often we get posts, and they make no sense at all and expect us to be clairvoyant!