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danda

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    http://www.jscard.org/

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  1. Yes, it was the 22uF 25v capacitor on the secondary board that I replaced. It was only today I noticed that there's also a 10uF 50v capacitor on that board too, but I didn't have a replacement for that so I just left it as is. For resistor values, I don't have a picture but I did write them down. R102 is a 150Ω (brown green brown slilver), and R103 is 22Ω (red red black silver). However, when I measured R102, it measured 50Ω. This could be because I was measuring it in circuit, or my multimeter's battery dying on me, but I didn't replace either resistor and it still seems to work,
  2. The triac and capacitor arrived today, and after replacing them in the AC PSU (which Apple call the "Power Supply Block"), I'm delighted to report that I have a fully functioning LaserWriter II! I've had this printer sitting here for over three years now, so it's great to have it finally working. I've also got a box of all the different IO boards for the LWII (SC, NT, NTX, g and f), which I'm now going through and trying. I also seem to have three NT boards, so if anyone needs one, let me know! The pickup roller still needs some attention as although manual feed works p
  3. The triac I'm replacing it with is the Q6015L5TP which is a 600V 15A one I'm hoping will be suitable. The optoisolator is a "S21ME4 Sharp X7" and I'm not really knowledgable enough to figure out a suitable replacement for it. If anyone knows more about this or a suitable replacement, I'd be interested! In the meantime, I'll be replacing just the triac and capacitor when they arrive, and hoping for the best.
  4. I've mentioned David Given's fantastic FluxEngine before, but I wanted to alert the community that as of the most recent release, FluxEngine can now write (as well as read) 800k Mac disks. If you're not aware, FluxEngine takes a regular 34-pin PC floppy drive, and by hooking it up to a ~$10 development board can read and write many obscure floppy disk formats (as well as the more common ones). It's very easy to assemble - just take the development board (available from several online component resellers), solder on a single set of pins to connect the floppy drive cable, flash the f
  5. Yes, the AC PSU. It has a triac to control voltage to the fuser, along with a single electrolytic capacitor. The key is to Google for "laserjet ii error 50" and there you'll find a few pages of people talking about this. Some people say the triac goes bad, others talk about the capacitor, and there's also a solid state relay in there too that can apparently be an issue. I'm replacing both the capacitor and the triac. I would have replaced the SSR except I couldn't find a replacement for it and I lack tools to do surface mount soldering properly. So I'm hoping that's not the issue!
  6. I've ordered a new Triac and capacitor for the PSU, and will report back once I've replaced them. Apparently those are the most likely parts that cause this issue. Here's hoping, anyway! I ordered them about a week ago but shipping here is very slow at the moment.
  7. I have a LaserWriter II that I've been working on today. It wasn't picking up paper at all, but after putting a few rubber bands round the pickup roller it is now picking up paper with a 50% success ratio! Not great, but I'll take it for now! I'm able to print the service test page, which is great. The main issue is that, when powered on, after a couple of minutes, it flashes the two red lights (paper out and paper jam). This means a fuser issue, which is also confirmed when I put in a IIg board, jumper pins 4 and 22 of the serial port to put it into diagnostic mode, and it also sh
  8. I vaguely remember reading in a PostScript manual from the 80s that the original LW and LW us didn't actually have quite enough ram to hold an entire page of some size. I know it can hold an entire A4 page, so it could be that it can't hold an entire letter page. I'll have to do some googling to see if I can track down the source for this.
  9. Do note that the pickup rollers aren't round - they're like a D or semi-circle shape, so that when they turn they pickup the paper. I'm not sure if that affects what you're thinking of doing or not, but I though it was worth mentioning. Those thick bands look like they could be good though, you could get too large ones and then cut to exact size needed.
  10. @olePigeon It certainly worked for me - but note it's quite fiendish to get right because of the limited access you have through the read door of the printer! You probably could take it apart and do it properly, but when I did this back in 2013 I didn't have access to the service/take apart guide so didn't want to attempt it. What I did was: Clean all the old rubber that's now turned to goo off of the rollers Cut a rubber band so it forms a strip rather than a band Get some foam double sided mounting tape and stick the rubber band strip onto one side of it Stick the o
  11. I've got two Pluses (one branded a Plus, and the other upgraded to a Plus), and on both the pickup rollers went to sticky goo. I actually "fixed" one by cleaning the gunk off and then attaching a rubber band where the rollers were. Amazingly, this does the trick and it's been picking up paper fine for over 6 years now! Sadly there's something wrong with the paper feed just before the fuser so it always gets either crinkled or stuck there (this could be due to the separation belt, but I didn't have any luck getting a replacement for that). And my only toner cartridge is streaky, leaky and faint
  12. Regarding copy protected disks, I honestly don't know as I don't have any to test - most of my existing 800k disks are user copies, not original. David, the developer of FluxEngine, does say this though: Interestingly, compatibility with the GreaseWeasel is something that David has considered:
  13. Yup, 1.44MB "Mac" disks aren't really "Mac" at all - they're just regular IBM formatted disks, so the FluxEngine can read them fine. You will need an external power supply to power the floppy drive; also a computer running some version of Windows in order to program the PSoC board with the necessary firmware (once you've programmed it, the "client" software which does the actual reading of the disks can be run on any platform).
  14. I should start off by saying that absolutely none of this is my work, I am just letting the 68kMLA community know about it. This is all done by the amazing David Given. The FluxEngine is a floppy disk imaging device that hooks up to USB on one end, and a regular PC 34-pin floppy drive on the other. It can image the raw transitions from the drive, and therefore is able to handle a whole host of weird and obscure formats that PC drives can't normally handle. It's also very inexpensive - around $10 for the board (a standard PSoC development board) and a connector to connect the floppy
  15. Wow, just stumbled across this thread today - never heard of M.A.C.E before but it looks really cool! I knew of the Reclassification project, but that's been dormant on GitHub for a while and was never beyond planning / alpha-quality. It's great to see such great progress in this area! My interest is firmly with HyperCard - I maintain the "HyperCard Stacks" collection at the Internet Archive, with over 3,500 stacks added so far. (This uses a JavaScript port of the PCE emulator, to allow the stacks to run in-browser). I'm curious as to what the final business model for something lik
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