Jump to content

Macintosh Plus Chirping Noise


Recommended Posts

  • Replies 76
  • Created
  • Last Reply

Top Posters In This Topic

Also, on the crt was this red stuff important?

 

That's just silicone sealer to prevent possible arcing form the HV lead to the ground coating.  Not necessarily required and I don't remember any of my macs having it.  RTV silicone will do if you want.  It was common in TVs.

Link to post
Share on other sites

That's just silicone sealer to prevent possible arcing form the HV lead to the ground coating.  Not necessarily required and I don't remember any of my macs having it.  RTV silicone will do if you want.  It was common in TVs.

 

 

Alright, thanks ill look into that

I did notice the anode cap moves around, would the RTV Silicone prevent that?

Link to post
Share on other sites

Update: I replaced the fuse in the wire and i'm still at the same problem. Although I have noticed that when the power/video cable is NOT connected the analog board makes that high pitch noise coming from the large transformer on it, but when it IS connected the speaker starts to make the same noise the transformer does. And lastly when I turn the Mac Plus off slowly, the CRT makes that static electricity noise that CRT televisions make when you turn them off.

 

I'm going to look at The Dead Mac Scrolls again to see anything else...

Link to post
Share on other sites
  • 2 weeks later...

AFAIK adjusting that resistor is a bad idea, unless you have replaced some parts around and you want to tune voltages.

 

tuning it will increase the 5 volts, but also the 12 volts line, which can be dangerous for the board.

 

Can be dangerous for yourself also, you are dealing with high voltages.

Link to post
Share on other sites

Hmmmmm... Well then I'm not too sure what to do.

 

Well, I'm going to list all the events that have taken place since this project's start.

 

There was a craigslist post I saw about a working Macintosh Plus, Imagewriter II printer, and all of the start-up disks plus manuals for $75.00 (it was on the site for quite a wile). So I contacted the seller and asked if it was still for sale, he said yes and that there was another guy from NY who also wanted it so if i could meet up at a certain time it was mine. So I said ok to the time and then went to pick it up,

When I arrived he greeted me and showed me the boxes and its content, he then took it inside plugged it in and was going to demonstrate it but the screen was blank and it was making the "errrrrrrrrr" noise. I then asked if he could lower the price to $50.00 he then said yes. So I paid him the $50.00 and took it home. When I plugged it in and flipped the power switch it made the "beep" startup sound but the screen was not displaying a picture, so I found out that if I sharply tapped the left side of the case there was a picture and the mouse and keyboard seemed to work fine.

Although I do recall that I probably did something stupid, when the external disk drive was out of the case I plugged the connector into the floppy port (stupid decision) and then the computer went into it's current state (no picture, start-up beep, and the high pitch chirping and ticking ((when up close)) started.) I then tried to figure it out/troubleshoot by myself and I did then mess with the voltage resistor (foolishly), at this point i did not know what else to do so i became a member of the 64k MLA and then asked for help. (which I highly appreciate  ;D I replaced some of the components suggested by you and one of them was faulty, the fuse in the wiring harness (which i think is what the floppy disk drive triggered).

 

And now I'm here, Hope this information will help.

 

G'nite!

Link to post
Share on other sites

Will  be hard to figured out, if The Plus is still making the ticking sound, as Techknight said before, the regulation side is not working properly and nothing will work (no screen, no chime...)

 

Problem is, can be a lot of things (capacitors, but those are reliable, diodes, transistors) anything preventing the power supply from working properly.

Link to post
Share on other sites
  • 4 months later...

Hey, I'm back. Sorry for the absence, I should have said I was taking a break.

 

Anyway, I've started to work on the Mac Plus again. I tried to upload a photo but the website does not want to cooperate with me right now. The picture is of a pair of tubes/light bulbs on the analog board. I'd also like to ask how to check the flyback transformer safely.

Thanks!

 

Link to post
Share on other sites

Really? Yes, I was because all of the new flybacks I've seen don't have that on them... Also, the reason I thought that it was a culprit was because it looks like it flowed down towards the bottom of the Mac at some point. I'm not an expert so please excuse my ignorance. Thanks for pointing that out!

 

-Jack

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...