Macintosh Classi II. No sound

[ferol]

Hello again everyone,
 
 
Greetings from Spain.


 
I have Macintosh Classic II; Is fully operational except sound.
In the past there was sound, although it emitted hissing. Now there is no sound.
 
Could the reason be some specific capacitor?
 
Should I check another reason before?
 
I should inform you that when I bought it, it did not work, and after cleaning the plate with cleaner "residue 0", the computer worked but with the whistles.
 
Thank you for your help.

 

[3583Bytes]

Capacitors are dying, I had the same issue on mine. They have to be changed.

 

[Macdrone]

Also the speaker itself on classic and classic II's have been proven to go bad.  they are kind of a pain as you have to drill the rivets out to replace.

 

[Johnnya101]

Just wondering, where would one get a new speaker if needed?

 

[Macdrone]

I had a bunch of LC's, I just pulled one from there.  

 

[ferol]

Thanks for the answers.
The computer works fine, only the sound fails.
Could you tell me which capacitor would need to be changed to fix the sound?
  I think it's not necessary to change all the capacitors
Thank you.

 

[BadGoldEagle]

Could you tell me which capacitor would need to be changed to fix the sound?

  I think it's not necessary to change all the capacitors

You're better off changing them all (on the logic board at least). And it's recommended that you wash the board to get the capacitor gunk off.

Caps don't age well. You're lucky it still works!

 

[ferol]

Thanks for the reply.
 
I am not an expert and I am afraid to cause a big fault.
 
I prefer to change only the necessary ones. In the future I will change all.
 
Best

 

[Compgeke]

Change all now or in th future your entire board will be toast from badly damaged traces.

 

[ferol]

Is there a schematic or an image where you can see all the references of the capacitors to be changed?

 

[Johnnya101]

Just look at the top of each one. Otherwise on the 68k wiki there's a list, but you've got to check because one of them there are between like 8-10 of a certain type.

The classic IIs are getting killed like daily by the caps... mine luckily has no leaking yet (Yes everyone, I'm changing caps soon), but so far every other one has.

 

[ferol]

I found it :

http://www.maccaps.com/MacCaps/Capacitor_Reference/Entries/1991/10/21_Macintosh_Classic_II.html

or

http://www.maccaps.com/MacCaps/Capacitor_Reference/Entries/1991/10/21_Macintosh_Classic_II_Revision_2.html

 

[techknight]

or contact a recap service and have it done professionally? 

 

[Johnnya101]

360Alaska did my SE/30, and it came out perfect. Really reasonable and friendly! And obviously a fellow member!

 

[ferol]

The problem is that in Spain there is no recap service. ...

 

[CharlieFrown]

you can try any local electronic repair shop, it doesnt need to be Apple - specific. Probably costs 10 eur or so, but believe me it's worth using professional service. My Classic II didnt survive amateur recap process..

 

[Boctor]

you can try any local electronic repair shop, it doesnt need to be Apple - specific. Probably costs 10 eur or so, but believe me it's worth using professional service. My Classic II didnt survive amateur recap process..

Nor did my SE/30 board, in the end. But I expect the fact it was sitting and rotting for a few decades had a hand in this, too. (In the condition it arrived, it's a miracle it ever worked.) I'd agree: Go with a professional if you're not eager to learn any soldering.

If you do want to practice with caps or soldering, never begin learning on a board you care about, namely a Macintosh of any kind. The IIsi was a piece of cake to recap, zero bad solder joints anywhere, but it took lots of practice.