-Low Sound in A1200

[Drummerboy]

Hello,

This morning, when i was using my A1200, a couple of times when the right button mouse was pressed, i listened a sound like " tack..tack" in the Speakers, but i not give importance. A few minutes ago, i hear again thats sound, then i start to suspect something is wrong, and after check with some Mods Player, Sids Player, and WHDLoad games and change of speakers, the  results is the sound is very low, for can hear something was necesary to raise the volume to the max.
Another thing is, if you change in any Mod Player the Filter use, thats sound (tack tack) appears.

The questions is...

The sound chip are dying?

Somebody here, happened the same or similar thing?.


Comments, suggests, recomendations

best regards

[Drummerboy]

The capacitors are dying. They'll need to be replaced.

hummm

Where is  thats capacitors?

Its not necesary only change a Paula Chip?

[Drummerboy]

I've same problem, it's because black 0,5mmx1mm part (what ever it is) is broken near rca connector

I get "good" sound from composite

Ok,

When you say composite, is from RF Output?

Then thats capacitors, give power to the Paula Chip with the RCA ouputs ?!

If its common this kind of damage, why happen this?

You know a have the strange or common practice if i dont use the computer for a few muinutes i  turn off the monitor, but the started the computer, i use a C=1942 monitor in this A1200 Conected to Audio Monitor RCA inputs, can this damage the capacitors?, or i using a PCMCIA network card, has any relationship any of this things?

Anyway i ask this becouse  in this things sometimes happen mistery facts.

[Drummerboy]

Ok,

Let see if somebody can help me showing where is the capacitors.  Here any Pic if the Motherboard

And somebdy know what number of part is, and if is available obtain in anywhere electronics components store.

[Drummerboy]

Ok,

i found some answers to my own questions..

Apparently, the problem with this capacitors, its becouse theyre leak like the batterys!!.. yeah .. the nightmare continues!!!..
Then, the recomendations is replace for Non polarized capacitors.. theyre not leak.

Anyway i am using the A1200 for write this post, i will check if can see any leaked signal in any part in the motherboard .

if somebody has any idea, commment, answer to the asked questions or recomendation please let me know..

[Drummerboy]

I've written plenty of detail on this subject in this article.  It describes the A4000 analogue audio stage, but the A1200 circuit is mostly the same.  The main difference is the physical layout.
Replacement parts are available from the likes of Farnell, Radio Spares Digi-Key.

If you can't repair it yourself, I operate a comprehensive Amiga repair service from New Zealand.  Contact details on the site mentioned above.

Great Article!!..

thats explain everything about this thing..

Congrax.

I found a Capacitors 22uF x 35v .  (--- this can work right?

[Drummerboy]

That will work. I replaced mine with the original SMD type, only high quality Japanese variety as Castellen noted (Panasonic and Chemi-Con, both excellent).

Ok..great!..then... now..Lets Work!!

[Drummerboy]

Ok,

I was checking inside and and the apparently the acid only was in the Capacitors base, but never put many atention to this compnentes in the A1200, and see i cant replace the componentes my self, becouse my soldering tool its not properly, then i be need do with any people have the right soldering tool.
Anyway, for now y clean the motherboard and the bad capacitors.

But here born a new thing!, becouse inside the A1200 i sew 2 more capacitors the same Rating, and other capacitors, diferent number rating, but the same look, then the Question is..

Exist any damage report in this other capacitors?..

[Drummerboy]

Before working on your Amiga - try swapping your PSU for one that's known to be good.
 
One of my PSU's developed a fault which allowed ac to be passed through to my A600, causing a machine gun rat-tat-tat sound through the speakers (and graphical glitches/system crashes too).

Humm.. intersting.. and any problem with the sound?..

[Drummerboy]

Definitely! Replace them all. On the few boards I've repaired, they seem to fail somewhat randomly (some worse than others). If the leakage is minor it might not be visible (yet), so IMHO go ahead and clean around all of them until you can get it repaired.

Ok, i will do, replace all them ..

thanks

[Drummerboy]

One of my PSU's developed a fault which allowed ac to be passed through to my A600, causing a machine gun rat-tat-tat sound through the speakers (and graphical glitches/system crashes too).
 

 
Take a guess! :hammer:

With other PSU, the same failure!..