Yes, i have been in discussion with the repairer and since then started various fault finding options
And eliminations which resulted in a clean bill of health for the panels !
the latest checks are pointing to a faulty coil/cap board which I am currently sourcing.
i will report the outcome
cheers
And eliminations which resulted in a clean bill of health for the panels !
the latest checks are pointing to a faulty coil/cap board which I am currently sourcing.
i will report the outcome
cheers
I have gone through all coils on the delay board and identified one faulty coil.
this one has been replaced and the speaker performs now perfectly again 👍
it has been an intersting and time consuming exercise but with a good outcome
thank you to all who tried to help - much appreciated
regnal
this one has been replaced and the speaker performs now perfectly again 👍
it has been an intersting and time consuming exercise but with a good outcome
thank you to all who tried to help - much appreciated
regnal
That so great you found the problem and its fixed. Well done!
I see it was a long and troubling process identifying the issue. Now that you are in the position to see the entire process you went through it would be really useful to identify why it was so hard?
Was it the panels being repaired that threw you off?
Could there have been a different diagnostic process that could have saved you?
Would the Quad testing process have picked the fault?
This info could help others in future.
Thanks!
One can be thrown off the scent quite easily as the majority of ESL problems are usually related to panel issues.
so one spends a lot of time taking panels out inspecting refitting , cross checking etc.
I did measure the coils earlier on but obviously at the wrong terminals - you have to work out the fitting pattern of these coils the make sure you measure the correct pins.
in the end I took out the delay/coil board, took off each coil and verified its ok - this way I came across the faulty one.
i am sure there are better or quicker ways - I find that quad fault finding flow chart a tick confusing to be honest - may be not so much for an ESL professional - I am a hobbyist !
regnal
so one spends a lot of time taking panels out inspecting refitting , cross checking etc.
I did measure the coils earlier on but obviously at the wrong terminals - you have to work out the fitting pattern of these coils the make sure you measure the correct pins.
in the end I took out the delay/coil board, took off each coil and verified its ok - this way I came across the faulty one.
i am sure there are better or quicker ways - I find that quad fault finding flow chart a tick confusing to be honest - may be not so much for an ESL professional - I am a hobbyist !
regnal
If you look at the diagnosis results in the faultfinding chart many are faulty panels, faulty delay line elements are not listed, I am not sure how common this fault is, I have never come across one but I am sure others have, good to hear you got to the bottom of it, random failures like this are always difficult to find
Stuart
Stuart
hi there,
it took many hours of testing. If you know the coil/delay board then you will know what these coils look like.
i call them “pigs ears”.
yes, you are quite right in assuming the majority of faults are indeed panel-related issues. That is why evetybody points straight in that direction. - as it happened in my case, however I was fairly certain my issues were not panel related.
its pointless to crack open the coil housing as a repair seems not worth the effort. The coil just delivered a open circuit reading…which of course messes with the delay line.
but all under control now 👍🙏🏼
regnal
it took many hours of testing. If you know the coil/delay board then you will know what these coils look like.
i call them “pigs ears”.
yes, you are quite right in assuming the majority of faults are indeed panel-related issues. That is why evetybody points straight in that direction. - as it happened in my case, however I was fairly certain my issues were not panel related.
its pointless to crack open the coil housing as a repair seems not worth the effort. The coil just delivered a open circuit reading…which of course messes with the delay line.
but all under control now 👍🙏🏼
regnal
Great work sorting that out. I wouldn't expect a coil to fail. How does a coil fail?
Indeed - this is the first time I've heard of it happening. I think I would have rebuilt pretty much everything else before getting to that!
Yes, the coils occasionally go bad. I can often repair them, but I've got so many now that I generally put them in a "to be repaired" pile and ignore them. :O
Here's a many page thread on them: https://www.diyaudio.com/community/threads/quad-63-and-later-delay-line-inductors.338927/
Sheldon
Here's a many page thread on them: https://www.diyaudio.com/community/threads/quad-63-and-later-delay-line-inductors.338927/
Sheldon