Hi there.
Clicking coming from the speaker.
youtube links at bottom...
With the floppy plugged in it makes noise in time with speaker click.
I unplugged the floppy and rebooted. Now I don't hear the floppy making noise but the speaker still clicks.
Nothing appears on the screen. No chime.
Sanity check, I put my 512K motherboard into the Plus chassis and it boots up just fine. That means the analog board, which I have re-capped is fine.
All cables from analog board to crt and to mobo work just fine.
This isolates the issue to the motherboard.
I had a system where it was giving me vertical lines but the floppy icon center screen was fine. I thought it was capacitors. I looked at the mobo and saw a round circle of yellow under one of the capacitor ends. So i ordered a kit and went in there to swap them. Turns out the yellow circle that I thought was capacitor goo came off like masking tape. Well it peeled off with no issue. I went ahead and replaced the capacitors. I did not remove the leads going through t he board. Instead I snipped the wire close to old capacitor and soldered on new caps and snipped off the excess. I made sure that they were in the correct direction and I used a pre-made kit.
One of them ( reference this link https://www.classic-computers.org.nz/blog/2015-05-14-mac-plus-checkerboard.htm
The cap that is up there closest to the keyboard RJ11 connector is a 50V 1uf and I replaced it with a 100V 1uf.
The rest are 16v 33uf.
Curious if I messed something up, I referenced this site http://recapamac.com.au/macintosh-plus/
was able to confirm I did it correctly.
So as I was saying, I snipped off the resistor, one end of it anyways, that controls the memory type. I then had swapped out for 4x1MB 70ns
At some point I had a bong chime but it was a checkerboard pattern so that is how I found the link above. But that checkerboard was only one time.
Now it doesn't do anything but click click click from the speaker.
I put the original memory back in thinking the memory was bad. Re-soldered the resistor.
Still the same result. click click click.
I took precautions. Anti-static pad with grounding straps. But we have really dry air and its been very windy here in SoCal. I wonder if it just wasn't good enough. I wonder if I STILL managed to zap something.
What else can I check? Per that blog above I tested the voltage of the floppy port. The voltage is all over the place. Not a steady 12v
Here is a video of the clicking. https://youtu.be/2YEfFjJQ03U
Here is a video of a 512K board in the same chassis. https://youtu.be/DKW8AZCezFM
Oh and just in case one of the caps was bad, I re-did them this morning.
I also re-flowed the solder around the white plug that comes from the analog board down to the motherboard just in case. According to the link above I should remove the solder and re-do it. That will be my next step.
But wanted to check with you guys first.
Clicking coming from the speaker.
youtube links at bottom...
With the floppy plugged in it makes noise in time with speaker click.
I unplugged the floppy and rebooted. Now I don't hear the floppy making noise but the speaker still clicks.
Nothing appears on the screen. No chime.
Sanity check, I put my 512K motherboard into the Plus chassis and it boots up just fine. That means the analog board, which I have re-capped is fine.
All cables from analog board to crt and to mobo work just fine.
This isolates the issue to the motherboard.
I had a system where it was giving me vertical lines but the floppy icon center screen was fine. I thought it was capacitors. I looked at the mobo and saw a round circle of yellow under one of the capacitor ends. So i ordered a kit and went in there to swap them. Turns out the yellow circle that I thought was capacitor goo came off like masking tape. Well it peeled off with no issue. I went ahead and replaced the capacitors. I did not remove the leads going through t he board. Instead I snipped the wire close to old capacitor and soldered on new caps and snipped off the excess. I made sure that they were in the correct direction and I used a pre-made kit.
One of them ( reference this link https://www.classic-computers.org.nz/blog/2015-05-14-mac-plus-checkerboard.htm
The cap that is up there closest to the keyboard RJ11 connector is a 50V 1uf and I replaced it with a 100V 1uf.
The rest are 16v 33uf.
Curious if I messed something up, I referenced this site http://recapamac.com.au/macintosh-plus/
was able to confirm I did it correctly.
So as I was saying, I snipped off the resistor, one end of it anyways, that controls the memory type. I then had swapped out for 4x1MB 70ns
At some point I had a bong chime but it was a checkerboard pattern so that is how I found the link above. But that checkerboard was only one time.
Now it doesn't do anything but click click click from the speaker.
I put the original memory back in thinking the memory was bad. Re-soldered the resistor.
Still the same result. click click click.
I took precautions. Anti-static pad with grounding straps. But we have really dry air and its been very windy here in SoCal. I wonder if it just wasn't good enough. I wonder if I STILL managed to zap something.
What else can I check? Per that blog above I tested the voltage of the floppy port. The voltage is all over the place. Not a steady 12v
Here is a video of the clicking. https://youtu.be/2YEfFjJQ03U
Here is a video of a 512K board in the same chassis. https://youtu.be/DKW8AZCezFM
Oh and just in case one of the caps was bad, I re-did them this morning.
I also re-flowed the solder around the white plug that comes from the analog board down to the motherboard just in case. According to the link above I should remove the solder and re-do it. That will be my next step.
But wanted to check with you guys first.
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