Another broken Mac Plus with some odd symptoms
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- Опубліковано 19 кві 2024
- On the channel today we have a broken Mac Plus machine which is a come-back. This is a machine I had previously worked on and given to a friend, but it was returned to me broken. Can you guess what's wrong with it based on the symptoms?
Unrelated, it seems like a bunch of other channels ha4ve been fixing Mac Plus machines as well, but I can assure you this is complete coincidence. (I had actually worked on this machine before those other videos came out.) So let's fix this busted Mac, hopefully once and for all!
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15:17 So now I feel guilty... Date code 8925 & 8928. These memory chips were made on a machine that I likely installed. In 8909 I left the UK and moved to Munich to my new job as a field service engineer. While still learning German, my first asignment was assisting at Siemens in Regensburg to install APCVD machines. The world was drunk on cheap RAM and to compete, manufacturers had to pump out more and more... until the bottom fell out of the market. Our machines increased the thoughput at that process step.
So, sorry Adrian, and everyone else! Another great fault-finding video. p.s. I still live only an hour away and still work in the industry... only now I am self-emplyed and travel the globe
Where can I send my cv, there’s not formal experience but willing to learn a lot
Double-clicking the power button quickly on that Anker power bank will keep it on regardless of how much power what is connected to it is drawing
this should be higher on the comment chain... Hopefully Adrian will see this
A lot of various brands do implement a feature like this, not just Anker
I concur. I found this out for myself only a few weeks ago.
I put it down to the tiny current draw on the circuit I was powering.
After I pressed the button twice (Anker power bank), the unit remained on until I removed the circuit.
If a power bank doesn't have that feature, you could solder a keep-alive resistor to a USB cable. Some experimentation is needed to find the highest resistance that works.
@@p1mrxnon sense
I've had a lot of bad memory in my life too. I'm hoping old age will eventually take care of those bad memories.
Back when SIEMENS made chips. I remember the "space race" between West Germany and East Germany, where West Germany would produce Microcontrollers (mainly for PLCs or automotive), and East Germany would have Zeiss copy them because they were world leaders in microscopy, etching, and fine grinding technology. Which triggered SIEMENS to build chips that are sealed in a vacuum and fall apart upon contact with air, which triggered East Germany to do this in vacuum, which triggered West Germany to, etc. etc. etc.
The Mac Plus actually predates SCSI being ratified as a standard, so it's not quite 100% compatible. I'm still waiting for my BlueSCSI to show up, but in the meantime, I've found that SCSI Zip drives work great with the Plus.
the "speaker click" reminds me of the banging heads of the Apple II
Woz at his finest! The simple fact that he was able to write a bootloader in 256 bytes, is amazing. The man could program!
In fact, if you could fit a peanut butter sandwich into an Apple ][ drive, it would read it!
@@jeromethiel4323 what would the drive say?
@@tezcanaslan2877 Claq-claq-claq-claq
Part and parcel of the minimalist design. To get to track 0 from anywhere the heads might be, it just stepped the heads 40 times. (IIRC the apple 2 disk drive was 40 track, i could be wrong it's been a long time.)
And then instead of using a track 0 switch to stop the motion, the head stepper (which was a rotating plastic disk), would just jump the track when it hit track 0, which made the claq sound.
The Apple ][ was full of little hacks and work around that were just genius. Wozmon, a full hex editor in 256 bytes. Amazing!
Nice repair video Adrian!
It would be nice also to check the 5Volt rail with the oscilloscope on the second board to see if that ripple is there for this board also...
Cheers from Greece, Jim.
Yeah, it was you who actually gave me the tips which enabled me to get the SCSI2SD working on one of my Mac Plus machines a few years ago!
It's quite funny how "RIFA" has become so famous among retro fans. A Swedish WW2 effort to secure the supply of components that later got bought by Ericsson and then sold of to Kemet.
Huh, didn't know us Swedes were to blame for the RIFA caps.
Also had no clue there's been a Swedish KEMET division for the better part of 17 years somehow.
We have those same RIFA caps on old fluorescent tube lights as well, and on some of those, you'll see the witness marks of the explosion of them essentially evaporating and then the lights fix themselves.
Always Amazing!!! Thank you Adrian!
I just realized that I'm not getting much time to spend on youtube as I used to do, but whenever I have some I usually watch your channels. Congratulations for the captivating content and for you being you. Thank you!
Thanks for a great repair video that brings back lots of feelings of nostalgia!
“caps on the wrong side of the power switch” !! What!? That’s horrible - I have three Macs to unplug now.
I think the idea was to reduce the power on noise ripple feeding back into the power line as well as filter noise in the power coming in. So regardless of how seemingly ridiculous this is to have something always connected to mains, it has a purpose. Not that I agree with it.
@@jandjrandr yeah, it's not uncommon. I've seen other devices with always hot caps.
How about creating a mod to fix this?
Thank god for British electrical sockets that have a switch at the wall - much easier to keep the caps powered off and safe...
@@volvo09Easy to tell, if it zaps you when you accidentally touch power input pins with the power switch off it's got caps before the switch. Learned that the painful way when I was going to move my lab bench supply. Turned off the switch pulled out the power cord and then it still zapped me when I brushed the C13 socket pins with my arm. Open it up and to no one's surprise at this point caps were before the switch.
Missed an opportunity to recheck the 5V rail on the new board 😊 But another sweet video from you, thanks!
That rapid popping from the speaker reminds me of loading blue max on the C64 from tape. :)
Oh, Blue Max. Played with that a LOT with my C64. But from floppy, not from tape.
I’ll just love your videos. Thank you so much for your effort and keep up good work🎉
Great Video Adrian!
Please tell me that Danger Danger High Voltage was an intentional Electric Six reference.
another fantastic vid from a legend
@2:36 Jeez, Adrian! You JUST warned us about that analog board, and here you are, waving your hand all around the flyback connections...I'm having ElectroBOOM expectations, now! 😄
Thank you!
Hey Adrian, a lot of those Anker power banks have a mode where you double click the button and it prevents the charge circuit from shutting off if the draw from the connected device is too low. mine shows a green led in one of the dots when it's active.
It would be nice if you preserved the original display aspect ratio and size. In my view, the horizontal stretching you do on these makes them look horrible, and the black borders are supposed to be there, these were calibrated to be WYSIWYG, so every pixel on the screen is supposed to be the exactly same size as physical dimensions in the period correct programs and the printed result.
Good video as usual. Thanks! It seems likely that an MPSU05 could be the compliment to the MPSU51.
That jitter reminds me of the vertical linearity issues I had with an old GoldStar (now LG) monitor I had with my 64... that was about the time I swapped it for a 13" TV instead.
Regarding the memory...if those resistors were configured for 2.5M, it'd be expecting 2x1M + 2x256k but it had 4x256k installed. Wouldn't it try to test an extra 1.5M that doesn't exist and fail? I wonder if that's all it was, maybe it did work properly until someone got creative and swapped the two 1M SIMMs for another pair of 256ks.
There used to be a whole glossary to the clicks these early Macs would do when failing to boot. Usually in the same area as the "sad mac" codes.
8:27 Not sure if anyone has said already, but there is in fact a recreated BMU2, I have added one in one of my Mac Plus machines in fact. Let me know if you want a link to the GAL file Adrian, I'll email it to you. (UA-cam never likes me posting links it seems).
love your work adrian, ater watching your videos for a while i felt emboldened to attempt a repair on my yamaha av htr-5950 sound system, successfully replaced a greencap capacitor on the power circuit and in tonight's birthday party we have decent music again at last, thank you so much
thang, put another peasant on the catapult, i wanna see if my shotgun is still pulling left.
PULL...
.
.
.
ka-fricking-boom...
That Electric Six reference, love it
wonderful work. More Macintosh contents pls...
I mean... literally if you would say.. make a video about you making a cup of Coffee , I would give a thumbs up instantly. Or whatever you upload. Please , keep going.
I remember upgrading a number of people from a Plus to an SE (mostly secretaries and receptionists) and at the time the small boost in speed was actually noticeable.
Just noticed the wedding band. Congrats!
The one thing I remember from my time working with the 9" Macs is that the optimal HD sector interleave for the Mac Plus was 3:1, for the SE it was 2:1, and for all later systems 1:1.
That diode must have been really expensive and must have been cut late in production. Who would have thought we would plug SBCs into SCSI Ports one day...
Ripple on DC supply rails for digital circuitry can cause all kinds of issues, I have seen devices lock up or randomly misbehave due to ripple on a 5V rail, if there is high ripple definitely resolve that.
After the first two minutes of the video, I'm fully convinced the fault on this computer is a woodpecker infestation.
Too Much LGR? 😉
I'm sure that ripple on the 5V rail is too high even after you replaced that 1 cap, could well be causing the jitter it showed at the end, replace the other caps.
oh well, would be interested to see the other analogue board repair, i was thinking poor regulation of the voltage that powers the vertical deflection, it looks a bit like it runs out of steam at the maximum downward deflection voltage. maybe that, or the transistor you indicated is acting up.
That clicking followed by the beep reminds me of the Quantum 850MB HDD I used to have in my first Olivetti Pentium 75 PC, after it spun up it did a similar sort of noise as it gathered its thoughts... :P
brilliant video as always. its funny when you install 4mb RAM on these machines, i feel like this is a loads of RAM because im so used to retro channels running 64/128k systems :P
Hey mate, love your videos! just wondering if you know of a good place to buy macOS disks for this model? and is there a good place to find a compatible mouse for this mac as well? thankyou
Great episode! So I am curious why you adjust the monitor to make the image taller? Wouldn't that cause the pixel aspect ratio to not be correct? Or are you doing it for preference? All early material I could find suggest that in the default configuration, the image should be like it was before the adjustment.
lol it's emulating an apple 2 floppy drive! That's what the sound is.
and people laugh at the UK having switches on the mains sockets...
just curious, when you work on a CRT, do you have someone around to periodically check you haven't electrocuted yourself ?
Danger! Danger! High Voltage! When we touch, when we kiss, when we touch!
(I see what you did there)
I scrolled down for this comment!
did you check the 5v rail on the replacement board to see if that had the same fuzziness?
Ohhh i see what you did there! This was a pico pick. You just wanted to try out your new toys LOL
avoid plugging in the mouse when it is powered up, I experienced issues doing exactly that many years ago causing issues with it not being recognised properly.
Great ❤
I just got one, let me know what you think: it turns on and chimes, but the screen shows a white background with horizontal and diagonal zigzag lines on it. Could it be blown capacitors? I know nothing about repairing these macs so let me know if there's someone I can send the board to that can fix it. And I want to learn how to fix these as well, so if there's any good videos I should watch then someone please tell me!
I got confused between the Mac Plus board, and the 512 board. I wasn't sure what you were working on.
I wonder Adrian if your probe ground "extension" might also introduce noise? There's a reason they're painfully short normally?
So, it's an apple so well matured that it's already jumping. ;-) 🍏
You could give Rammy something to do and put these RAM sticks through your fancy tester. :)
The missing termination power is also a problem on all of Apple's various SCSI cards for the Apple II. (Some third party cards did provide term power, though.) Fortunately it's easy to add a diode those cards to add termination power to them.
Nice Repair- Adrian.., any way I could get this one from you?
Happy to pay for the Mac Plus & Shipping!
The inside of Mac enclosures are sprayed with conductive coating for EMI compliance. Without the white plastic barrier in place on the analog board, I wonder if it's possible to create a short if the outside panel is pressed in a certain way during handling.
That ripple on the +5v line looks wrong to me. Like, backwards. If you haven't shipped the Mac Plus out yet, I'd probe the known-good one just to make sure that's normal.
Great video. FAR too short! heh :)
Man, you are a Mac Daddy technician! 😆 Nice job finding the problems on this system.
The only other negative post I’ve ever left (not with you) is the ubiquitous response every time I get when I posit a crt question, which you just reiterated as I’m typing this…. Is that I have 3 Mac Plus’s and they all suffer from the same click no bong and no one has ever posted an actual fix.
i see at least 3 bad caps, slightly stressed.
even new comps do that. I had a dead ram that did that.
I love the Mac videos. When the BlueSCSI was plugged in I was screaming at the screen, "that won't work on a Mac Plus!" 😆 Pretty awesome and easy mod to get the SCSI termination power on that system.
If the Machine thought it should have 2 MB of RAM but only had 1 MB installed, maybe that was the problem. For some reason 1 MB configuration doesn't work. As such this machine still has a fault but in 4 mb configuration it doesn't present.
Bad inductor(for the ripple)?
Maybe not all 4 of those sticks of ram are bad?
You forgot XMP lol 😅and the obvious question is " Can it run Crisis " lol 😶🌫
Mac Plus! 😍
HOW DID YOU DESTROY IT 😊
I would love to have one. I had one a long time ago. But a met a guy who wanted it more than me and he offered a really nice price, so I sold it. I did regret it eventually, but then I got into girls then I did not miss it until now.
Sounds like it's pretending to be an Apple II series (the sound a 5.25 Drive makes at boot)
Is the Mac 512 the same as the "Fat Mac"? I remember we upgraded our original Macintosh to the 512k version. We even got a metal sticker to stick on the front of the machine
That's correct, the Mac 512 was nicknamed the Fat Mac.
New lights??
@adriansdigitalbasement Not sure if this suggestion is getting too organised 😁, but perhaps if you add an extra note on your "fault notes" of what channel and episode you worked on the item - you will have a quick reference back to that video, without wasting time looking for the episode (if you need do).
By the sound of it it’s trying to boot into Apple II mode! 😉 1:28
it has a knocking rod
31:09
Danger, danger!
High voltage!
When we touch, when we kiss.
Don't you wanna know how we keep startin' fires?
It's my desire.
It's my desire.
Mmm Aberlour
henlo
i feel stupid when i see you solving things . lucky for me i got more hair and almost sure i can fix cars better than you ;) . love your channel
I noticed that the capacitors on the analog board you took out , were looking like they were shrunk. Those should be addressed.
Thank you for all your actual hard work, Adrian. So many UA-camrs are lazy, childlike slobs that can barely pull together a Fortnite livestream every week. They "burn out" because things start to feel more like making games than playing them. The amount of labor you put into that Mac alone today would have them crying lupus. Again, thank you for your work.
Notification Squad! :D
get moose
Tell you what the adverts on UA-cam are getting to be unbearable
slow news week lol
Am i the only one who is annoyed by Adrian always having something in his mouth while talking in every video?
Apple has already given up on these devices, why are you still trying to save them? I think you should buy a boat and use it as an anchor. 🤣
Meh. Never liked macs. Probably because i have always felt that Apple lost it's way with the mac. The apple ][ line was a better bet, IMHO. Unfortunately, Jobs didn't like it and killed it, in favor of "his" design (which he didn't design, he was a salesman, not an engineer). In short, an egomaniac killed a good product line that i liked, just because.
And Apple has been shit ever since. I don't like i-pads, i don't like i-phones, i don't like i-pods, and i don't like macs. The only reason these products still exist is the cult of personality. Apple people are pod people.
Steve Jobs may have killed the Apple II product line, but it did run until 1993, which seemed to be the time when a lot of 8-bit computer lines died. They'd run their course and fallen out of favour, as 16 and 32 bit machines replaced them. The Commodore 64, ZX Spectrum, Atari XE and BBC Master all ended production around 1992-1994.
@@Zeem4 The Apple ][ line could have continued on into the 16 bit/32bit/64 bit eras.
The Apple 2GS, for instance, was a 16 bit version of the 6502. Heck, the Apple 2 line could have moved to the motorolla 68000, which i really liked as a processor.
If I would talk 4 hours and waste GB of internet space every time I change a RAM stick, the internet would collapse. What a waste of time and energy and resources this video was. Just change the RAM, dont have to make up an issue just to be a UA-camr. How about original content or useful information next time?
🔔🔚
This video, if you care to look, teaches how to diagnose problems on the analog board and video side, and thus has value. A lot more value than your comment - which is a waste of bytes, by your own terms.
What's hilarious is you're getting ratioed. Good.
😂
@@QuintusCunctator to diagnose problems you don't start by the unobtainium PAL chip but you start with the simple things you can rule out easily and are most likely (ram and sockets/simm slots are much more likely to fail over soldered chips that are not known for going bad). And changing the whole analog board is not a repair either. its just swapping parts. It was, for me, a disappointing video, changing already changed caps and hoping for an improvement? It seems like a filler video and forceful production of any video just to make a video, that's all what I said. Usually you can change RAM without letting the world know and have something more interesting up the sleeves if you do that professionally. Man, take the advice or comment or not, or block me if you are not allowed to say anything. He prob will knows himself it was a filler Vid where nothing really happened. Usually, it's more interesting. He himself refers to another video where he already did that work, so there was really nothing new except some misleading concepts on how not to start a diagnose.