M-audio AV30 speakers recap and repair

[Logistics]

Re: M-audio AV30 speakers recap and repair

Ceramics in audio path = bad idea. You can use polypropylene or polystyrene.

I admit that I didn't read carefully, but when did he mention the caps in question being in the signal path? (I'm in agreement with you, though.)

[fcda]

Re: M-audio AV30 speakers recap and repair

Thanks, I've added my country to my profile: Scotland. Usually get stuff from Farnell or RS.

The ceramics have 104 on them, so I think that's 0.10 uF.

I'm not sure if I'll be able to read anything off the burnt out diode. I'll try and de-solder it and see. Hoping SnowKitteh might have the details.

[ben7]

Re: M-audio AV30 speakers recap and repair

Also trying to repair a set of these. On mine the zener diode Z1 has burnt out, and the electrolytics C48 and C47 (220uf 25v) look suspect. There's another zener (Z2) and a couple of ceramic caps (C4 & C10) nearby which I'd also like to replace.

Does anyone know of suitable replacements for the zener diodes and the ceramics?

A pic (not detached the board from the back plate yet):

Holy bulged capacitor!

Yes, those capacitors look toasted!

If you can see them, just read the numbers and letters on the parts that are dead. We could then point you to what you should get.

It would be nice if we could know what country you are in, so we could help find a parts supplier somewhat near you. (Reduce shipping costs...)

[fcda]

Re: M-audio AV30 speakers recap and repair

Also trying to repair a set of these. On mine the zener diode Z1 has burnt out, and the electrolytics C48 and C47 (220uf 25v) look suspect. There's another zener (Z2) and a couple of ceramic caps (C4 & C10) nearby which I'd also like to replace.

Does anyone know of suitable replacements for the zener diodes and the ceramics?

A pic (not detached the board from the back plate yet):

[Top Fuel]

Re: M-audio AV30 speakers recap and repair

The caps in question are the electrolytic ones

[Top Fuel]

Re: M-audio AV30 speakers recap and repair

my roomie got a set of AV-30s that someone was just gonna throw out cause they didn't work. i popped em open to take a look, and sure enough there were a few obviously vented caps, and a few that had the labels toasted up by a zener diode that exploded. the capacitors were lxon brand (i think... kind of hard to read the font on them) after replacing all of the electrolytics, (except for two 1uf 50v nonpolarized ones near the bass boost switch, i accidentally ordered polarized ones and didnt wanna swap the wrong kind in.) two ceramic caps that looked discolored from heat and two zener diodes, one of which exploded and left some nice burnt traces on the bottom of the board for me to repair i was finally able to hook them up for a test run, the job was a success and they pump out decent sound for a small set of speakers. unfortunately, i do not have any pics of the damage or the repair because my camera takes grainy out of focus pics of small stuff like that.
wheeee, first post (long time lurker though)

Hey Bud . I am up agaisnt the same problem . What is the value of the 2 caps by the zeners . I think they are 22 uf , not sure . What is the voltage on those two zener diodes . If i get that figured , I'm up and running . Many thanks bros.

[SnowKitteh]

Re: M-audio AV30 speakers recap and repair

Ceramics in audio path = bad idea. You can use polypropylene or polystyrene.

any recomendations? i might replace those two caps later. also, i mostly used nichicon and panasonic caps for the others. (the pannys were i think FC and FR series? got em off mouser.)

[Th3_uN1Qu3]

Re: M-audio AV30 speakers recap and repair

Ceramics in audio path = bad idea. You can use polypropylene or polystyrene.

[SnowKitteh]

Re: M-audio AV30 speakers recap and repair

ack, won't let me edit my post. made a typo on the two caps i didn't replace, they were 0.47uf, not 1uf. does anybody know if i could replace them with ceramic caps since they are nonpolarized?

[ben7]

Re: M-audio AV30 speakers recap and repair

my roomie got a set of AV-30s that someone was just gonna throw out cause they didn't work. i popped em open to take a look, and sure enough there were a few obviously vented caps, and a few that had the labels toasted up by a zener diode that exploded. the capacitors were lxon brand (i think... kind of hard to read the font on them) after replacing all of the electrolytics, (except for two 1uf 50v nonpolarized ones near the bass boost switch, i accidentally ordered polarized ones and didnt wanna swap the wrong kind in.) two ceramic caps that looked discolored from heat and two zener diodes, one of which exploded and left some nice burnt traces on the bottom of the board for me to repair i was finally able to hook them up for a test run, the job was a success and they pump out decent sound for a small set of speakers. unfortunately, i do not have any pics of the damage or the repair because my camera takes grainy out of focus pics of small stuff like that.
wheeee, first post (long time lurker though)

Good job, and, lucky for getting off with such an easy repair!

[SnowKitteh]

my roomie got a set of AV-30s that someone was just gonna throw out cause they didn't work. i popped em open to take a look, and sure enough there were a few obviously vented caps, and a few that had the labels toasted up by a zener diode that exploded. the capacitors were lxon brand (i think... kind of hard to read the font on them) after replacing all of the electrolytics, (except for two 1uf 50v nonpolarized ones near the bass boost switch, i accidentally ordered polarized ones and didnt wanna swap the wrong kind in.) two ceramic caps that looked discolored from heat and two zener diodes, one of which exploded and left some nice burnt traces on the bottom of the board for me to repair i was finally able to hook them up for a test run, the job was a success and they pump out decent sound for a small set of speakers. unfortunately, i do not have any pics of the damage or the repair because my camera takes grainy out of focus pics of small stuff like that.
wheeee, first post (long time lurker though)