Apple ][ plus extreme cleaning + testing the Panasonic Monitor
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- เผยแพร่เมื่อ 21 ก.ค. 2024
- Welcome to part 2 of my the very special Apple ][ plus series. In this video, I found out I needed to do some extreme cleaning before I attempt to repair this machine. Let's get right to it!
Part 1: • A viewer sent in a ver...
Part 2: This part!
Part 3: • Fault finding and tryi...
Part 4: • Fixes for the Apple ][...
Part 5: • Apple ][ plus: 8304 re...
Part 6: • Apple ][ plus: VIDEX 8...
0:00 Intro
0:45 Why I need to do extreme cleaning
13:54 Testing the Panasonic monitor
22:18 Motherboard cleaning results and testing the Apple II+ after the cleaning
--- Video Links
Panasonic DT-S101 / Panasonic CT-1113 (TV version)
Chassis NMX-K102A
--- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.16...
Jonard Tools EX-2 Chip Extractor:
amzn.to/2VazxDS
www.jonard.com/Products/EX-2-...
Wiha Chip Lifter:
amzn.to/3a9ftWw
www.wihatools.com/precision-c...
O-Ring Pick Set: (I use these to lift chips off boards)
amzn.to/3a9x54J
Elenco Electronics LP-560 Logic Probe:
amzn.to/2VrT5lW
Hakko FR301 Desoldering Iron:
amzn.to/2ye6xC0
Rigol DS1054Z Four Channel Oscilloscope:
www.rigolna.com/products/digi...
Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
amzn.to/3adRbuy
TL866II Plus Chip Tester and EPROM programmer: (The MiniPro)
amzn.to/2wG4tlP
www.aliexpress.com/item/33000...
TS100 Soldering Iron:
amzn.to/2K36dJ5
www.ebay.com/itm/TS100-65W-MI...
EEVBlog 121GW Multimeter:
www.eevblog.com/product/121gw/
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
www.ebay.com/itm/USB-Logic-DS...
Magnetic Screw Holder:
amzn.to/3b8LOhG
www.harborfreight.com/4-inch-...
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
www.ebay.com/itm/14-16-18-20-...
RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
www.retrotink.com/
Plato (Clone) Side Cutters: (order five)
www.ebay.com/itm/1-2-5-10PCS-...
Heat Sinks:
www.aliexpress.com/item/32537...
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Links
My GitHub repository:
github.com/misterblack1?tab=r...
Commodore Computer Club / Vancouver, WA - Portland, OR - PDX Commodore Users Group
www.commodorecomputerclub.com/
--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino
Outro Music:
Abyss by | e s c p | escp-music.bandcamp.com
Music promoted by www.free-stock-music.com
Attribution 4.0 International (CC BY 4.0)
creativecommons.org/licenses/... - วิทยาศาสตร์และเทคโนโลยี
![Apple ][ plus: 8304 replacement from AliExpress, more keyboard fixes, and a huge surprise!](http://i.ytimg.com/vi/984mZex2pKY/mqdefault.jpg)
![Apple ][ plus: VIDEX 80 column card, CPM on the Apple II and servicing the disk drives](/img/n.gif)
Chips of widely differing years are typically indicative of a closing plant. The order will come down to end production - that does NOT mean they stop assembly. It means that the company will assess exactly what parts they happen to have on hand from all previous products. They then plan on how many final products can be made from available parts. Production will continue from miscellaneous parts. The decision to end production may be made early, but if a single part can help produce profit, it will be ordered "post-production" -- IF the part can be used in a future product.
Basically, they run out the line, depleting existing stock as much as possible, buying new parts IF they can be used for future products as well.
When a product is either scaling up or is in full scale manufacture, new parts are on order constantly. Some companies use their old parts, others don't. We often talk about Commodore computers where old parts being used on a board is very uncommon. That's largely because Commodore would redesign the board making many old chips unusable or at the very least undesirable. Other manufacturers made boards that also used custom chips that only they could produce as well. Manufacturers that went with more generic parts used "off the shelf" parts that get used on multiple products. This can lead to an accumulation of parts from a wider range of years - but the earlier chips won't get used initially. They'll sit on shelf somewhere else until a product is terminated and then a call goes out for parts on hand. Those parts will then be added to others and those will be used to finish production of what's left. All of the parts have already been expensed. The remaining costs for labor, utilities, etc. will be all used to price the item. It will likely be sold at just over cost for a marginal profit. Lots of shady retailers resell out of date equipment to unsuspecting individuals or even businesses. Sometimes the equipment is donated as a charitable item and this is a tax write off.
My Dad got an Apple II+ in the early 80s and used it to learn BASIC programming as he switched careers shortly before I was born. This was our family computer into the early 90s and got me hooked on computers growing up. Seeing you meticulously cleaning and caring for this computer warmed my heart. My Dad is 70 now and still has his Apple II+ in working condition. Thank you for making this video. 💛
One of the first things I do with old socketed boards is to re-seat the IC’s. You can usually hear the oxidation cracking as you ease out the chips! In many cases I find this alone will revive a dead board. When you were cleaning the board, I was thinking that I would’ve removed all the chips from their sockets first. :)
I thought about that as well, but there is a significant possibility of introducing a problem that wasn't there in the process. That is a lot of ICs.
That's a usual Adrian thing. Test first, then reseat and deoxit the chips. Here, the chips seem to be getting voltage in spec with the power supply, so probably a good thing for the next video.
@@chemmerling Yes, I suspect you are correct. With old boards I generally start with just a cursory clean (eg. compressed air and brush), before an initial test power-up. When that fails, simply reseating all socketed IC's and connectors is then my next step, which in many cases gets me a working outcome (which I then follow with a deep clean).
I last used an Apple IIe back at school, some 37 years ago.......thanks for the memories!
We still had 2 or 3 Apple IIe's in 1990, my first grade classroom. I used to play Oregon Trail whenever possible.
My first computer was an Apple //e back in 1983. It still works. More recently I was able to purchase a gadget that lets me connect a Disk ][ to my Mac via USB. :)
Last used real hardware back in 2016 or 2017 (I forget which Geek Group trip that was), only messed around with BASIC and couldn't save as the disk drives weren't hooked up and neither was a cassette recorder.
Great cleaning job! I'm looking forward to part 3.
The timing of this video series couldn't be better. Pulled out my childhood ii+ a couple weeks ago to go through. Also, I ordered up my first bottle of 303 while watching this video;)
8:45 - Looks like Watery Soap to me........... :D
(Couldn't resist that Odd Tinkering reference!!!)
But where is the Ducktor?
22:42 Ooh, shiny!
Looking good, Adrian! Love these in-depth cleaning vids. :D
And that monitor brings back some feels of the mid-80s for sure!
Hooray! Someone else that scrubs their circuitboards in the sink. People get so upset about this, but it's the best way of cleaning a circuitboard (though not a PSU/CRT circuit etc...). I've done this so many times and it makes a huge difference. In the UK quite a few homes have an airing cupboard (where the hot water tank is), and I leave the cleaned board in there for a week. Also, for cleaning grime and really mucky stuff, test a small patch with Isopropyl 70% alcohol - amazing at getting rid of grime, and really good on casings.
Can’t wait for the next episode!
Can't wait for the next one. Keep up the awesomeness!
Back in the 70's I used to hang out at a computer store on my way home from school. Somebody brought in an old S-100 bus computer that didn't work and one of the memory cards had something spilled on it. Although I think it was only an 8K card, the chip density was unbelievable. The guy who ran the store stuck the board in a dishwasher and dried it, and it worked! I've done similar things to electronics in my career. Once you've dumped a soda in your device, a little water is likely not going to make it worse. The Korg Polysix with the cat pee on the digital board was the worst.
Classic computers left to dirty, break, or disintegrate always hurts to see. You do great restorative work, Adrian! :-)
A thought for the cloudy plastic on the keys, I've used a metal polish called Peek when I've had dull or lightly scratched plastics, and it polishes out the cloudy dullness nicely, usually that's oxidation of the plastic when it's that light powdery look, which polishing removes and smooths things out nicely... :)
Finally good to see you working on apple 2 systems. Hopefully you have more as they were the gold standard back them.
9:08 - I've tried a lot of over the counter products for cleaning plastics and really like Meguiar's G4116 Natural Shine Protectant ($5 in the car cleaning dept @ Walmart) applied with a micofiber cloth. Gently cleans without damaging/drying out the plastic and gives the surface that perfect satiny just-out-of-the-box look, especially on textured materials. Works great on car interiors too, of course.
As for the color bars, when I was little, I always had a fascination for watching color bars on TV that one of my local channels had back in the day at 5:30AM before the channel would begin its broadcast day. Those color bars had a section in the middle that had the broadcast channel number and call letters in white letters.
As for electronics, I loved taking them apart to see what made them work, and even put them back together.
Cliffhanger!!! Great video Adrian.
When I used to write business software for the Apple II+ we put a rubber washer under the Reset key to prevent accidentally resetting. ;)
i was expecting a fixing video.... arrg ! one more week to go... this drive me crazy... nice work adrian !
nice adrian your the best on outube i never get bored watching your vids
Great videos series, thanks for sharing-I'm the original apple II kid, but personally I wouldn't have cleaned it before finishing the trouble-shooting since from my experience, it's too easy to introduce another issue thereby compounding the repair process. Your initial smoke test symptoms: power light on, screen filled with gibberish, no beep, indicates bad MOBO or PS. Since you tested the PS, the next thing I'd check is the 74LS74 power reset chip, then the crystal, or one of the 8T97 chips.
Years ago (2007-ish) I picked up an entire school computer lab of everything from II Plus to IIe Platinum that failed to sell at a yardsale in Tennessee. The early 80s systems had a mixture of old/new chips, while toward the IIe Platinum it was mostly a newer / consolidated design. I don't know when they started consolidation, but if had to guess, 82 or 83. I had a bunch of expansion cards including some test readers that were used by the school.
Repair hints as I remember from Dr Levinson...
You can remove the BASIC ROMs ($D000 - $EFFF); leaving the 2 $Fxxx ROMs. This will give the "Apple ][" and break into Machine Language Monitor.
Look at the language card, as the RAM chip from the mother board is moved there. Take it out and put it on the mother board. That will give you 48k.
Press all the chips on the socket, no doubt water got between the chip and the socket.
The rest you know from fixing C64s. Check the clock and the reset lines. Check the video connector. Etc...
Edit: I forget- check the video cable too.
I used to have a switch on my chroma signal to my 1702 so that I could BBS without squinting so much. It worked a treat!
There is something odly satisfing to see things get a good cleaning and ending up looking nearly like new.
Dirty but not as bad the the spider farm that was going on inside a Sony PVM that Retro Tech restored recently. I love the cleaning montages, especially keyboard keys, so satisfying.
Try a pair of vise grips if there's part of the screw shank still sticking out from the hole. Gotta be careful not to apply too much torque, of course. Outstanding channel and videos BTW! Thanks so much!
I bought a phillips 17" colour in 88' for my amiga - they still make the best monitors and also for medical use....
Nice!!! Huge fan from Brazil🇧🇷 keep the awesome work! 👏👏👏
I have an Apple 2e, Color monitor, and floppies that were in a threshing barn for at least 20 years. The 2e was not too bad but did have a fair amount of seed, husk, dirt/dust, and bugs. The floppies were really bad-off with dirt, mouse poop, urine, seed, husk bugs, and other unidentifiable's. I found 4 drives and made two workable. I did tear the 2e down and cleaned it good. There was also a C128, 1571, and Excelerator Plus. The 128 needed a good bit of cleaning, as it was near the thresher but the drives were near the apple 2e. That keyboard you had was clean compared to the 128's. They were loaded with years of crap! The 128 was spider central and it had so many bugs in it (hence the spiders). I took a lot of time with it and it still has some KB issues but now looks good for its living location. I had to reflow the power jack and switch, flush and clean (many times) the power switch. I never knew so much stuff could be in such a small space! The KB needed a few plungers 3d printed (I used tinkercad to make) I had to recoat the KB traces as they there shot in places even before cleaning. I just used an old #2 pencil and colored happily for over an hour. The PSU was dead as well and I used a 9VAC wall wort and a Hi-Link HLK-20M05 for the 5V and placed those back in the PSU case. I plan to recap it all at some point soon as well, but surprisingly they all seem ok but will do them.
almost 10k views in less than a day! you're killing it, brother!
Great vid mate. Great Sunday morning viewing. I'm sure vinegar in the jar was a hit for Thin Lizzy.
Always learning so much, thanks a lot Adrian ;) Btw some day you should do a video on how you setup your basement, with the tables and how you are evolving down there ;) would love to know more about that.
Great stuff as usual Adrian. Nothing like cleaning keys while watching shango's greatest hits. "Needs more twerkulating..."
NTSC or "Never The Same Color" as we call it in the PAL region ;) ... ahh good old times.
Also what we call it in the NTSC region... hehe... 😅
We did fine with NTSC. Less noise and a higher framerate than PAL, anyway.
@@infinitecanadian True, though they got the resolution in exchange. I lived through the late 80s and early 90s making the joke that we recorded everything on masking tape! 😂
While true, NTSC allowed WOZ's color hack to work allowing us to have color as early as the Apple II. PAL regions didn't get it on composite or if they did it would have only been on the IIgs or an adapter for the //c.
@@richfiles It was also easier to use in studios.
Ah, the look of a bygone era... where PCBs had through-hole components with silk-screened part #s for easy servicing. None of the surface-mount rubbish! 😊
Adrian, there is a small white silkscreened square on the motherboard near the power connector - this is where Apple stamps the date code for the entire motherboard completion. Hopefully the stamps is still visible after the thorough cleaning you gave it!
Also note that the square is a little small for the stamp, so it is common to have a number to the left or right of it on the green (extra-hard to see!!)
@@Johnny-es9xg But he should, after all the stuff he has fixed, known better not to do those boneheaded fixes. I did not say anything about that until now but it was rather bone headed even for Dave.
@@GORF_EMPIRE which one?
@@Walczyk Mostly the dremmel on the edge of the screw really. He should have just waited and gotten the keyed star OR at very least, dremmel across the screw head and use a flat to take it out. You can get those keyed drivers anywhere nowadays and he went to the store. The paper clip does not bother me except for the fact that he should have done some more thorough continuity tests before trying it. 8 bit guy is a great channel and I watch it all the time and usually he is very thorough about how he goes about repairs. However, when you have something as apparently as rare as that machine seems to be, you certainly want to take better caution. Dave could be right about it being a proto that never really worked properly in the first place but to me that is just more the reason why you want to take whatever extra steps and be much more careful than it seemed he was being. I'm certainly not upset at him or will disown him as a result of it like some people did ...we've all been boneheaded at times but in a rare case like that, I think erring on the side of caution is always best.
So 3382 as seen around 3:58 ?
deamondeathstone1 good eye!!
Yeah, looks like 33rd week of 1982, but weird that it seems to be WWYY instead of YYWW as I have always seen...
So any chip past that date must have been replaced! (Looks like two - 25:25 we see 8311 and 8246)
Great video I really enjoyed it, fascinated to find the true date of this motherboard
The keyboard encoder was an AY-5-3600 by General Instruments which was a purpose designed PMOS device that used a couple of ring counters, a comparator, and a 3600 bit ROM to scan for switch closures and generate keycodes. As a side note however... by 1983 GI was selling the KB3600-PRO which was a PIC1650A microcontroller with a mask ROM for emulating the AY-5-3600 while adding a couple features.
Those 8T97s are the address bus buffers and blew occasionally when other address logic went up so I'm not surprised on the different chips. In the factory, all three were parts from the same feeder.
David Perkins gave a great suggestion. There's a good reason that mainstream manufacturers quit using socketed chips long ago. Each one of those contacts is subject to invisible corrosion. (OK - sometimes it IS visible!). Use a chip puller or a small screwdriver to partially remove and reseat every chip a few times. It's too much trouble to pull them completely out, plus it's easy to get clumsy and bend pins when pushing an IC back in. Not guaranteed to make your old clunker work again, but well worth the fifteen minutes it takes to do.
Back when sockets were common, badly trained industrial techs would remove a chip, replace it with a new one, and repeat until the board under test worked or they swapped every one of them without finding the problem. (Then they had to start thinking instead of acting like a dumb chimp, but that's a different story. ) Anyway, often enough that worked. The problem was that they did this with boards powered on throughout. This was when 4XXX CMOS chips were common, so while they usually got by with it, there was a good chance that they caused damage that wouldn't fail completely until later. The point of this is: Don't ever remove a chip without making sure power is off and using a wrist strap. Lots of people get by with ignoring this, but in the long run it's a bad bet to make.
I am so surprised to see you pointing out that 8T97. I just had to go see and yes I still have many of them dated 7912 and 7948 and also some other 8T series. Didn't really have any info on them back then when they were given to me as a kid to play with so I was curious about them for quite some time. Ah well, if you ever need one of those I can get you one :D
@Adrian's Digital Basement The splotching is due to the oxidization breakdown of the plastic. The trick I used years back is a sealant for plastic car parts. Make sure its a nonreactive sealant.
Dude! Goo Gone makes a great key cleaner. I let them soak in it overnight then rinse them under a small stream of running water. The dirt and grime practically fall off! Afterwards, I filter the Goo Gone and set it aside for re-use on the next project.
At the 6:55 mark you are correct about the Apple //e keyboard. The logic is all on the motherboard. If I recall correctly you can actually simulate key presses to some degree by unplugging the keyboard and jumpering the pins around.
Eek!! I would have done a chip reseating and got it working before a deep clean like that, and only done a dust removal (vacuum) first and a recheck. Also with those power supplies, you need to be really careful. Some of the rails are only managed with zeners and if they blow, you can take out a board (or at least a few chips). A single dry cap can throw all the rails off. Best to test against a test load block before applying it to a board. where I worked, we had a lab of apples + clones. The clone supplies were actually more reliable than the apple ones, those of which were often replaced by a clone supply for safety. The most common failures were the ram chips which always ran hotter than the rest so that was the first port of call. Best of luck!! looking forward to the next clip to see if it survived ;)
When I collected micros, my favorite part was cleaning and repairing. Can't say I used them that much though.
It's dirty, but at least it didn't have a living ant colony.
You mean "Anthill Inside"?
@@MoseyingFan Yeah, like the fieldfound C64.
Likely there are hopefully no coronaviruses there inside the apple 2 as they may keep watching on us, o,o,o.
@Brandon Taylor 'Zero Wing' much? :-)
@Brandon Taylor I know. I was making a reference to the iconic game quote from Zero Wing: 'All your base are belong to us'. Just a joke :-)
One common issue with Apple II Plus is the chips creep out of the sockets from heating/cooling cycles. This is especially bad with machines fully loaded with cards... I have fixed many back in the day by simply pushing all the chips down into their sockets!
I thought that was more of an Apple /// thing.
@@GaryCameron780 - Nope Apple II as well. Had to do that all the time back in my high school days.
Actually my Apple II Plus got so bad that it would overheat within about 20 min of turning it on and would start to "glitch", but then again, I had it filled with cards! My teenage solution at the time was to mount a 120Vac muffin fan (from Princess Auto!) inside the case so it would blow air across the motherboard... I cringe to think that I actually drilled vent holes into the plastic at the side where the fan was mounted (close to the joystick port), but it worked a charm and never overheated again! Of course, the computer was a little noisy though... :)
Had the same issue with the floppy drive ROM on my C128D so it is prudent to check chip seating.
As usual, great video.
You might want to spray the rusted broken screws in the case with WD-40 and let that soak in for a while before trying the dremmel trick on it next time.
Or Liquid Wrench.
VERY lucky to have an Alps keyboard Adrian! The Datanetics keyboards … replacement switches are hen's teeth. Datanetics is definitely more desirable among collectors, but Alps is more desirable if you want to be able to fix it. Me? I'm kind of in the modern Cherry-style replacement camp, if only because I'm interested in having options that don't involve finding dead machines to pick over for parts (or rather, the actual fear, machines that worked that were parted out and destroyed by unscrupulous eBay sellers).
Not only that, I'm starting to be interested in modern cost-reduced clones of the old machines. I think the biggest impediment before was that starting in about 1980 the machines started getting not only rapidly more complex, but also rapidly more based around custom chips that you just can't get anymore. It's bad enough there are so many standard chips you can't get anymore. But these days the tools to make them are becoming affordable and available to hobbyists. So now's the time to recreate these things if we want them! (And we do!)
For broken screws and bolts, a left handed drill can help if needed, if it grabs the screw in reverse it will tend to unscrew it, if not, it will drill it out. Just be sure the drill is well centered.
Have you tried a Dremel with a buffing wheel with plastic buffing compound to fix the space key?
I've had good luck removing seized, broken-off screws with a left handed drill bit, for what it's worth. Harbor Freight sells a set inexpensively, and for how infrequently I use them (like, 1-2 times a year?), they've been fine.
I recall there being quite mix of date codes on the IC’s in my original Apple II Plus from years ago, so yours may not have been messed with much...
Note the other comment about date codes - your motherboard has a stamped date code of 3382 (weird! It is usually YYWW, but let's assume someone was mixed up!), so 33rd week of 1982... I see from your list that you have two chips from past that, so these must have for sure been changed. Also, I think you are right to suspect those 3 mismatched early chips as well!
My 7935 Apple II Plus has different RAM brands for each 16K bank, leading me to believe it was first assembled as a 16 KB motherboard and then expanded on two separate occasions (perhaps even before it left the factory, since I think they standardized on 48KB by the time the Plus came out!)...
I remember the first time I tore a keyboard apart to repair I did not think to map out where each key went so I had to use my type by touch to remember where each key went. Basically remembering what each key I hit with each finger. That only happened to me once.
I have a couple of original Apple 2+ they were one owner. Both have a rather wide range of date codes on the IC
I used to work at an authorized apple educational repair center, we shut down the old apple repair service when apple shut down the program. We had tons of factory new inventory parts for Macs and Apple ]['s, Most of it went into the dumpster. I wish I would've kept it all, the owner probably would've said, take it if you want it.
To add to Greg Gall’s comment, the PC board manufacturer usually adds a date code at the copper level, (if not, sometimes as part of the silkscreen level), usually in YYWW or WWYY format.
Yay! 5.4" floppy of Wizardry! :D I got a PC Dos version myself. Absolutely love that game.
13:33 Newer Apple II plus models had a switch at the top of the keyboard just inside the case. When activated you had to press control with the reset button.
Also, in my experience working in an electronics manufacturer, it’s not uncommon to have multiple vendors for a given part, so some of the vendors likely had various lots of a given part, especially if they were a second-string vendor (buying up leftover lots from the manufacturers when certain products get discontinued etc.). As a case in point, one board my company built up until the mid 2010s had a fairly scarce IC, and the lot that was located to allow us to keep building as long as required had a 1981 date code! So, the variation in date codes would be somewhat reasonable for a vintage 1983 Apple.
they added a beefier spring inside the reset key in your model as well. I remember the reset key frustrating me when I was a kid in school cause it would reset out of the game as well
Older TVs, I'm talking up through the 1980s at least, had a dedicated circuit called a "color killer", which turned off the color circuits when a monochrome signal was being broadcast, improving the monochrome picture quality and eliminating any spurious color in the monochrome picture caused by interference. TVs of that era didn't have too fancy of filters to disable. I know this is a monitor, so a bit different.
Hey Adrian, some chip manufacturers stamp some info like date codes and type also on the underside of the ic package. I lately found that on some fake AY-3-8910 that had suspiciously new looking topsides on the underside still had original date code and YM2149 stamps on. So check the underside to see if this can clear things up.
Hey Adrian, nice videos. I think you have previously said you come from a professional IT background. If that's hardware v software then you would have had ESD precautions drummed into you like the rest of us have for the past 40 years. It would be great to see less comfy rubber mats and more ESD precautions on these treasures. Cheers.
You could try soaking the screws in ACF50 after the vinegar. Its an anti corrosion substance used in aerospace, so should do pretty well.
You might consider a vibrating tumbler with walnut shell media to clean your screws. They can be found on Amazon.
Man i wish you had a pair of Vampliers for the broken screws. Those type of pliers saves my butt all the time
Windex FTW :) Thanks for another great video :)
it can't be just me, who's face lights up when they receive a notification that there's another instalment from the digital basement of Adrian.
I absolutely love this channel.
With me it’s LGR...
I think you need to populate the missing DRAM IC. The chip is normally removed and put on the memory extension card. This trick allows the extension card to gain access to DRAM timing without having to add additional logic.
Or put the language card back in.
Just my guess though as I have never serviced them before.
Unless you count hitting them with the _Fonzie fist_ to get them to boot (due to bad socket connections on the mainboard, did that lots on the high school Apples, in the before times.)
Cheers,
Love it!
Fantastic looking board, It looks like the difference between a top end luxury car and a bottom end commuter car. "Well Made"
The mobo date code, shown at 1:47 is 3382. Right by the power supply connector.
The manufacture date of the II+ main board is on the white square on the corner of the motherboard by the power connector. It's handwritten on one of mine ("8139") and stamped on my other one ("2182"). At 1:48, you can see that yours is stamped with "3382".
While I didn't check each and every IC, my 1982 board probably has a few more 1982 chips than 1981 chips and I also saw an 1980 date code. Maybe someone found a couple of old parts bins the week that your board was stuffed.
Adrian, I'd be curious to know whether applying some hot air to the keycaps brings the colour back out. It is a method i've used previously with mixed success, depending on the plastic. As hot as possible without making them soft (80c hot air seems to work for me on ABS plastics).
The marks on the side of the keys is normally due to grout from fingers. The mix of dead cells, sweat and dirt act as an acid and discolour the plastic!
As for a dirty machine - long way to go. I had machines returned to IT where you could not see the chips on the board from the dust and bits - yuk.
Worse keyboard was one from a home office set-up where their youngster had an 'accident' without nappy (diaper) and they returned it to the office for us to clean - yuk yuk yuk.
For removing screws, you might want to get a set of screw extractors or EZ-Outs. They are a little like taps, but left-handed and wedge in the hole you drill. There are left handed drill bits that sometimes will spin out a screw on their own, too.
Screws stuck in those brass inserts are a pain to get out.
Wow both Adrian's digital basement and Ben heck hack on the same day? It's a good Saturday.
keeping us in suspense hey very good cleaning job though
I was thinking the same thing just before you made the comment about it being in a barn.
dang, that keyboard sounds great :D
Also, does the language card need to be installed? If I recall, there was a jumper cut trace and that socket in the ram section had a chip in it before the language card was installed.
What signal generator are you using and do you cover this in one of your older videos?
Does anyone know what detergent to use in the UK to clean motherboards? What's good/safe? I think I caught Adrian say he uses Windex, which unfortunately isn't available here. We have something called Windolene but I don't think it contains ammonia like Windex.
when you wash a pcb-board. Is it just water you are using. How long do it need to dry before you can connect it again. ?
stuff carried over from telegraph machines the G key says BELL on it. They press a ctrl or like an alt key on the telegraph machine to ring a bell on the machine you are sending to. maybe tell them a message is coming through or ending of a message etc.
I love the monitor. Pitty the clean up of the motherboard made it worse. It's amazing how often that happens. For the past 6-7 years, if I plug something in and it works then I don't mess with it. LOL. :) Looking forward to the next part.
Actually you'll see in part 3 it's not as bad as it seems :-)
@@adriansdigitalbasement Bit of a relief.
What a great video! Adrian, have you thought of doing a video on "monitor basics" both for color and monochrome displays? You have such a deep level of understanding of these concepts, and it would be fascinating to learn more! :) Keep up the amazing work!
Definitely!
Agreed, it would be really handy to have some of the stuff covered over time rolled up into more general and complete 'how to' videos
That is so scary to see you washing motherboards with soapy water 😅. I know that you know what you are doing but I never ever dare to do that by myself. Great video once again.
My open bench liquid cooled VR PC started leaking during a beatsaber session one day so I just washed the motherboard and GPU in hot soapy water and dried them, still works great.
Also revived a lot of spill damaged laptops at my old job with the same method.
One of the big differences between the II and the II+ was the auto-reset / auto-start sequence... Is the motherboard getting the power-up RESET?
Audio sounds great. What equipment are you using.
Sharpness is increasing or decreasing the highest frequencies of the video. As an analogy, in the audio realm, it's like a treble control. Jump the frequency up a couple megahertz,. and you have a sharpness control. The highest frequencies of the video signal contain the detail information. Boosting it too high can cause "sparkling". Decreasing the sharpness, removes some of the detail. The key to sharpness is to get the best signal without sparkling.
Don't know if you have this stuff up there, but Nifti is stronger than Windex. Next stronger is a good brand Sugar Soap. These ammonia based cleaners don't need much if any scrubbing. You could also try bleach.
Plastic can be polished like any car paint so for the key sides you could use 2nd cut and polish, which is slightly abrasive to clean and smooth, and polish to make it glossy. Cutting compound first if it's really bad.
CLR eats rust, so it might have got the rust out of the broken screws threads so they can be unscrewed. Vinegar is milder, but might also work.
any idea where i can get IIE key mech and keycaps?
I think Adrian has Neil from Retro Man Cave beat on extreme cleaning. Didn't think that was possible! :)
Hi! Every day with a new Video is a good day :)
May I suggest re-seating all the socketed chips. Those cheapo sockets can develop open circuits over time!