68kMLA Classic Interface

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Mac Plus Ticking Noise...
Posted by: boh726 on 2019-04-14 21:28:41 I recently found a Mac Plus that someone was planning to throw away. After bringing it home, it turned on and worked perfectly, except for the lack of a startup disk. After getting the startup disks and trying to put them in, I realized the floppy drive wasn't taking them. Fast-forward a month, I opened it up, took it apart to down to the drive, and cleaned and fixed the floppy drive. When I put the whole thing back together, it started making this clicking/ticking/chirping noise, with no startup sound and a black screen. I've been through the whole thing, and can't imagine that it's one of the capacitors if it was just working. I looked at the Dead Mac Scrolls (of course) and both options for what is pressumable the flup-flup-flup noise dont seem be it. (The analog board is out of adjustment. The voltage is too high./The power/video cable is disconnected.) I attached the sound, and also this piece of metal I found loose in the case. Maybe some connection. Hope someone has any idea what's going on. View attachment clicking.m4a
Posted by: unity on 2019-04-14 22:27:22 FYI, it may not be your exact issue but a ticking noise is normal with certain 800k drives until a disk is inserted and booted. And check your brightness dial. EDIT: I coud not get your file to play, but now I did. I will leave the above for anyone else searching but its not the issue with yours. You have a problem with the sweep/analog board. It may be something as simple as a cold solder joint. Check all your connections and specifically where they are soldered in.
Posted by: bibilit on 2019-04-14 22:31:28 Optoisolator is usually the problem here
Posted by: boh726 on 2019-04-15 06:14:01 FYI, it may not be your exact issue but a ticking noise is normal with certain 800k drives until a disk is inserted and booted. And check your brightness dial. View attachment 27336 EDIT: I coud not get your file to play, but now I did. I will leave the above for anyone else searching but its not the issue with yours. You have a problem with the sweep/analog board. It may be something as simple as a cold solder joint. Check all your connections and specifically where they are soldered in. Great, Ill look into it. Anywhere specifically, or should I just visually inspect the whole thing
Posted by: boh726 on 2019-04-15 06:14:50 Optoisolator is usually the problem here Would that have changed with no prompting? Where would it be and how could I test it?
Posted by: bibilit on 2019-04-15 08:56:53 Would that have changed with no prompting? Where would it be and how could I test it? Yes can go wrong out of the blue, the opto-isolator is using an Infra red diode that can go wrong with time. more about it here: https://www.electronics-tutorials.ws/blog/optocoupler.html No way to test it, but pretty cheap and socketed. Located near the brightness knob on the bottom left of the AB.
Posted by: Nathanplus on 2019-04-15 09:11:15 I would first replace the 1000uf and 2200uf caps then check to see if your connector needs cleaning. If non of that works I would check the MB to see if your tsm chip has fried I have 2 boards with dead chips. I would also check to see if your flyback is good and if any other caps are cracked ot leaky. I have.had many macs that died during working on them. The mac plus I think is by far the worst and not fun either because they are so random even in perfect condition.
Posted by: pbyfield86 on 2023-03-30 20:11:56 FYI, it may not be your exact issue but a ticking noise is normal with certain 800k drives until a disk is inserted and booted. And check your brightness dial. View attachment 20380 EDIT: I coud not get your file to play, but now I did. I will leave the above for anyone else searching but its not the issue with yours. You have a problem with the sweep/analog board. It may be something as simple as a cold solder joint. Check all your connections and specifically where they are soldered in. Hey is that what this sound is on my Mac plus. Upon boot up with no floppy disk and I hear this faint clicking in my video I put my phone on top of the Mac, so it sounds a lot louder. When I put a floppy disk in it goes away. Even after, but if I take it out, I hear it again. But I wanted to know if this is my issue.
Posted by: svenvendetta on 2023-04-04 07:21:42 Optoisolator is usually the problem here Any guidance on where to source one of these?
Posted by: desertrout on 2023-04-04 07:35:43 4N35 - any electronics store should have them, they're pretty common and inexpensive.
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