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| Macintosh Classi II. No sound |
Posted by: ferol on 2017-03-15 15:03:11
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.
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Posted by: 3583Bytes on 2017-03-15 20:25:04
Capacitors are dying, I had the same issue on mine. They have to be changed.
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Posted by: Macdrone on 2017-03-16 07:09:43
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.
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Posted by: Johnnya101 on 2017-03-16 08:22:25
Just wondering, where would one get a new speaker if needed?
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Posted by: Macdrone on 2017-03-16 09:30:03
I had a bunch of LC's, I just pulled one from there.
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Posted by: ferol on 2017-03-16 12:33:39
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.
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Posted by: BadGoldEagle on 2017-03-16 13:11:15
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!
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Posted by: ferol on 2017-03-16 13:18:54
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
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Posted by: Compgeke on 2017-03-16 13:55:13
Change all now or in th future your entire board will be toast from badly damaged traces.
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Posted by: ferol on 2017-03-16 14:02:47
Is there a schematic or an image where you can see all the references of the capacitors to be changed?
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Posted by: Johnnya101 on 2017-03-16 14:31:48
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.
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Posted by: ferol on 2017-03-16 15:41:38
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
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Posted by: techknight on 2017-03-17 15:07:45
or contact a recap service and have it done professionally?
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Posted by: Johnnya101 on 2017-03-17 15:11:57
360Alaska did my SE/30, and it came out perfect. Really reasonable and friendly! And obviously a fellow member!
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Posted by: ferol on 2017-03-18 13:12:55
The problem is that in Spain there is no recap service. 🙁 ...
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Posted by: CharlieFrown on 2017-03-19 02:36:48
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..
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Posted by: Boctor on 2017-03-19 03:26:02
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.
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