Mac Classic

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Mac Classic

One of my mates has a Mac Classic. I borrowed it to test something, but it is as dead as a stone. I would like to fix it for him, but I'm perplexed:

 

This system has no internal speaker. Is that normal? If not, where is the sprk connector? I see none. 

 

It has an internal fan, but IDR any of the " CRT all-in-one systems having a stock fan. Am I mistaken?

 

On power on, there is no video, and withough a speaker, IDK if it chimes. 

 

I'm unsure where to begin. I frankly have only ever worked on one Classic system before. I am far more familiar with the SE, SE/30, 512, and 128. 

 

I would appreciate any advice in basic diagnostics. I am in no way obligated to fix this, but I would like to do it as a courtesy,as he and I do a lot of trades and such, and he has given me quite a lot of useful kit of late--although I have compensated for that. 

 

I am going to be setting him up with a super-stock //e, and I'm working on a flawless DuoDisk for him, along with some disks to use on it. :)

 

Still, II would prefer to return this Classic in working condiion. 

 

FWIW, it doen't work on a base power-up. I only cracked it open, because it was already a doorstop. 

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Yes there is a speaker

Yes there is a speaker mounted in the case. It's been awhile since I restored one that suffered from a leaked battery. That was fun!

 

I paid to get schematics from BOMARC so I'm hesitant to post them here. A quick search shows that someone else took these watermarked pages and posted them elsewhere. If that doesn't work or you can show me that BOMARC has put these in the public domain, I'll be happy to send them.

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jeffmazur wrote:Yes there is
jeffmazur wrote:

Yes there is a speaker mounted in the case. It's been awhile since I restored one that suffered from a leaked battery. That was fun!

 

I paid to get schematics from BOMARC so I'm hesitant to post them here. A quick search shows that someone else took these watermarked pages and posted them elsewhere. If that doesn't work or you can show me that BOMARC has put these in the public domain, I'll be happy to send them.

 

Hmm... Did you buy anything that isn't in this set?

 

https://archive.org/details/Macintosh68kSchematics

 

Anyway, http://www.bomarc.org/ is now a dead site. I wouldn't have objected to buyig them on paper, but that is clearly no longer an option. Then agin, depending on how much the watermarking interferes with readability, IDK if they would have been useful. It may be a good idea to re-master some of this stuff in KiCAD, when I have the energy for it. 

 

There is no visible damage on the mainboard, althogh I removed the battery as a sake of caution. 

 

I suppose I will need to look again and see if I can locate where the speaker is intended to connect. There is normally a two-pin Moxel jumper, and I do not see it, nor any evidence of it being removed; but I will look again. 

 

 

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Did the link above get you

Did the link above get you what you need?

If not, here are the original bomarc files.

MacintoshClassic.pdf

MacintoshClassicEarly-PSU-AB.pdf

MacintoshClassicLater-PSU-AB.pdf

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