The only way to fix damaged "through holes" is by tiny wires safely soldered to both sides.
Did you inspect the old caps ?
Did you inspect the old caps ?
Hi as_audio and thank you again!
I inspected the old caps and they looked fine although I then found two pass throughs that were compromised, particularly one which joins traces on both sides. I did the thin wire "stitch" through the holes to join both sides and we are good to go!
Something that may be of help to other S3A owners... the power board layout and schematic are the same as those for the S2.5 units published on post #89 The difference of course are the values of some of the components ;-)
Now the funny part... All was fine on the bench until I reinstalled it into the studio when the low frequency hum returned. So I looked around and the answer turned out to be.... a recently replaced new WiFi router that was causing interference, from about 8 feet away! :-(
Thank you again!
Phil
I inspected the old caps and they looked fine although I then found two pass throughs that were compromised, particularly one which joins traces on both sides. I did the thin wire "stitch" through the holes to join both sides and we are good to go!
Something that may be of help to other S3A owners... the power board layout and schematic are the same as those for the S2.5 units published on post #89 The difference of course are the values of some of the components ;-)
Now the funny part... All was fine on the bench until I reinstalled it into the studio when the low frequency hum returned. So I looked around and the answer turned out to be.... a recently replaced new WiFi router that was causing interference, from about 8 feet away! :-(
Thank you again!
Phil
Hi, I have a pair of ADAM A7X's that suffered a power surge, it seems that the affected element in both is the subwoofer's audio amplifier. I can't see which one it uses, it's not marked and I can't find the schematics. Looking at the A7 schematics that as_audio posted in this post, the A7 uses the TDA7295 but I'm not sure if the A7X's use the same one. Can anyone help me with this?
Upps!!, i think that i m confused with the schematics of as_audio, and or the schematics is for DYA A7 or if is for the originals A7 the difference between A7X is big because the A7X use TDA8920BTH or TDA8920/54 ( last for new models ) and not are compatible. Ufffff SMD replacement....
Can anyone confirm this please ?
Thanks!
Can anyone confirm this please ?
Thanks!
Sorry as_audio. I only try to know wich type of subwoofer amplifier use ADAM AX7. TDA8920BTH or TDA8920/54 ? do you know this ?
A7X originally used TDA7294 for tweeter amp and TDA8920BTH for woofer. 8920 was obsoleted by NXP at some point, therefore later A7X models use 8950 or 8953 for woofer which required a few minor circuit and layout changes, IIRC.
I just took apart the board and I can confirm that the woofer amplifier is the TDA8920BTH from the manufacturer NXP and the twitter amplifier is the TDA7294 from the manufacturer ST Microelectronics.
Forgive my ignorance but if I can't find these integrated circuits from manufacturers and I find them from other manufacturers, can it affect the performance of my Adam A7X?
Forgive my ignorance but if I can't find these integrated circuits from manufacturers and I find them from other manufacturers, can it affect the performance of my Adam A7X?
Hello
My Adam A77X stopped working recently.
Both speakers are having the same issue.
They create a popping noise like a metronome. Audio ist still Pasing through them though.
I have a friend who could repair them but he told me he is helpless without schematics.
Could anyone provide schematics for this speaker? Would be highly appreciated.
Thank you
My Adam A77X stopped working recently.
Both speakers are having the same issue.
They create a popping noise like a metronome. Audio ist still Pasing through them though.
I have a friend who could repair them but he told me he is helpless without schematics.
Could anyone provide schematics for this speaker? Would be highly appreciated.
Thank you
Schematics are not released because this item is still on factory repair status.
It is not useful to spread your question all over the forum.
It is not useful to spread your question all over the forum.
Am I going crazy or has my previous post regarding S2.5A repair disappeared?!
Anyway, I managed to find a UK supplier with stock of the ICEPOWER250A module for UKP85 and all is fine now.
Cheers!
Anyway, I managed to find a UK supplier with stock of the ICEPOWER250A module for UKP85 and all is fine now.
Cheers!
Thanks for you reply, I have seen so far there are quite a few similarities between the S1X and the S2X. Is there a possibility you can send the S2X schematics instead? I could not find it yet in this forum so far
A small update:
I have bought the speakers. One of the 2 is completely in working order. The other is not.
After opening I learned someone else must have attempted a repair but didn't succeed. Inside is a power supply PCB from ICE power. Namely the ICE Power 300ASC. I will attach a datasheet as well. This unit is still sold as well so that's good news if this needs to be replaced.
On this PCB I have to replace C419 for the correct size (100uF 35V). (Current one is too big size wise) So that indicates it has a different type of dielectric. Might not be an issue but just in case. And also 2 1000uF 63V capacitors that are removed but not replaced.
Then the amplifier board has the following subscription: TW AMP ASC 318-01-01-R10 of which I have not found schematics yet.
It has 2 blown caps of 470uF 63V and the same trace on the back side 2 resistors are charred. From the working monitor I learned this is supposed to be 680R and 1k1.
So far this is all I could find that is wrong. I will order the components in the future and report back with an update if it works or not
I have bought the speakers. One of the 2 is completely in working order. The other is not.
After opening I learned someone else must have attempted a repair but didn't succeed. Inside is a power supply PCB from ICE power. Namely the ICE Power 300ASC. I will attach a datasheet as well. This unit is still sold as well so that's good news if this needs to be replaced.
On this PCB I have to replace C419 for the correct size (100uF 35V). (Current one is too big size wise) So that indicates it has a different type of dielectric. Might not be an issue but just in case. And also 2 1000uF 63V capacitors that are removed but not replaced.
Then the amplifier board has the following subscription: TW AMP ASC 318-01-01-R10 of which I have not found schematics yet.
It has 2 blown caps of 470uF 63V and the same trace on the back side 2 resistors are charred. From the working monitor I learned this is supposed to be 680R and 1k1.
So far this is all I could find that is wrong. I will order the components in the future and report back with an update if it works or not
