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AuthorTopic: -Low Sound in A1200  (Read 1946 times)

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Offline Drummerboy

-Low Sound in A1200
« on: November 22, 2009, 10:01:08 PM »
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
« Last Edit: November 22, 2009, 10:03:15 PM by Drummerboy »
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Offline Matt_H

Re: -Low Sound in A1200
« Reply #1 on: November 22, 2009, 10:02:48 PM »
The capacitors are dying. They'll need to be replaced.
 

Offline Drummerboy

Re: -Low Sound in A1200
« Reply #2 on: November 22, 2009, 10:04:16 PM »
Quote from: Matt_H;530835
The capacitors are dying. They'll need to be replaced.


hummm

Where is  thats capacitors?

Its not necesary only change a Paula Chip?
« Last Edit: November 22, 2009, 10:07:08 PM by Drummerboy »
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Offline F1Lupo

Re: -Low Sound in A1200
« Reply #3 on: November 22, 2009, 10:57:14 PM »
yep its the audio capacitors...very common problem with our beloved classic miggys !

Do a quick search here and you'll find all the info you need to get them replaced if you are handy with a soldering iron...if your'e not then hopefully youn have a friend that is :-)
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Offline utri007

Re: -Low Sound in A1200
« Reply #4 on: November 23, 2009, 12:15:24 AM »
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
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Offline Drummerboy

Re: -Low Sound in A1200
« Reply #5 on: November 23, 2009, 12:28:55 AM »
Quote from: utri007;530844
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.
« Last Edit: November 23, 2009, 01:40:43 AM by Drummerboy »
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Offline Drummerboy

Re: -Low Sound in A1200
« Reply #6 on: November 23, 2009, 12:44:49 AM »
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.
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Offline Drummerboy

Re: -Low Sound in A1200
« Reply #7 on: November 23, 2009, 02:59:24 AM »
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..
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Offline rkauer

Re: -Low Sound in A1200
« Reply #8 on: November 23, 2009, 04:31:33 AM »
Non-polarized capacitors leaks, too!

 It is strongly recommended swap the original polarized units for this other type because the original circuit is an alternate current circuit. Common capacitors will last much more than those originally installed.

 Capacitors leakage is less aggressive than battery leakage, but still corrode traces and can "pop" the audio pre-amplifier IC (a small IC near the audio out jacks).

 The capacitors are the 22uF x25V (or more voltage) near the audio jacks.
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Offline Castellen

Re: -Low Sound in A1200
« Reply #9 on: November 23, 2009, 04:38:32 AM »
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.
 

Offline Castellen

Re: -Low Sound in A1200
« Reply #10 on: November 23, 2009, 05:20:25 AM »
Quote from: rkauer;530869
Non-polarized capacitors leaks, too!

 It is strongly recommended swap the original polarized units for this other type because the original circuit is an alternate current circuit. Common capacitors will last much more than those originally installed.


@rkauer
Just read your comment regarding capacitor polarisation.  In this application that statement is simply not true.  Bipolar capacitors would only be required if the applied frequency is low enough so that the reactive impedance of the capacitor becomes significantly higher than the impedance of the load you're driving, and the AC amplitude is high enough, therefore causing the capacitor to be momentarily reverse biased to a level high enough to cause damage.

In fact I do recall explaining the same detail in the past, refer to this thread.

If capacitive coupling of AC signals using polarised capacitors was indeed a problem, then pretty much every piece of analogue electronic equipment on the planet would be affected; they all use the same techniques.

Some rare occasions where you do actually require non-polarised capacitors for audio coupling include:
- 2-wire telephone circuits, as the 50V line polarity could be either way
- Speaker passive crossover networks, where the low frequencies, high voltages and low impedance loads concerned are actually an issue with coupling capacitors

Have a read on basic audio amplifier theories for more detailed explanations.

The electrolytic capacitors in question typically begin leaking due to poor long term stability of the electrolyte.  For the same reason, many low quality capacitors of unknown brand are frequently seen leaking in modern electronic designs.  For example, it's a common problem on the DC reservoir capacitors in some modern computer boards, often less than a year or two old.  The parts are correctly polarised in relation to the DC supply, but they leak due to the unstable electrolyte.

That's why product from renowned manufacturers such as Panasonic and Rubycon are generally more expensive; because they've spent a good deal on research to obtain a stable chemical compound and have years of experience to verify it.  Sometimes you do get what you pay for.

So when providing advice *PLEASE* do try to give correct advice and research the facts if you're unsure.

Let me know if you need clarification on anything I've mentioned.
 

Offline Drummerboy

Re: -Low Sound in A1200
« Reply #11 on: November 23, 2009, 10:32:54 PM »
Quote from: Castellen;530871
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?
Amiga 1000, 500, 600, 2000, 1200, 4000...

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Atari 800XL (SIO2SD unit)

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Offline Damion

Re: -Low Sound in A1200
« Reply #12 on: November 23, 2009, 10:50:10 PM »
Quote
I found a Capacitors 22uF x 35v .  (--- this can work right?


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).
 

Offline Drummerboy

Re: -Low Sound in A1200
« Reply #13 on: November 23, 2009, 11:07:16 PM »
Quote from: Damion;531014
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!!
Amiga 1000, 500, 600, 2000, 1200, 4000...

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Jay Miner`s Atari 2600 - Wood front -

\\"Amiga, this Computer have a Own Live\\"--\\"Silence When the Drums are Talking\\".... DrummerBoy
 

Offline dreamcast270mhz

Re: -Low Sound in A1200
« Reply #14 on: November 24, 2009, 12:35:08 AM »
Couldn't you replace the electrolytic w/ tantalum ines, which (I think) don't leak
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