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OCCUPATION

Found 11 results

  1. Well, no sooner than my 540's power supply went caput, I now discovered that my LC III won't startup either, and instead just clicks. Apparently this is a pretty common issue, and I guess it can sometimes be resolved temporarily by applying hot air to the affected area? Grumble frumble...
  2. AwkwardPotato

    Apple M1296 12" RGB: No Raster

    I have a 12" RGB pizza-box-topper monitor connected to a PowerMac 6100, which according to this and this, should be able to output at the monitors 512x384 resolution. However, when starting the computer from either the OS 8.5 install, or the System 7 Disk Tools, the monitor doesn't display a raster. When powered on and off, I can hear it crackling, and the LED comes on. I've attempted adjusting the sub-brightness and sub-contrast controls, but to no avail. What are some things I should check for to attempt to repair it? Thanks in advance!
  3. AwkwardPotato

    LC No Longer Chimes

    I recently picked up a Macintosh LC with 12" monitor, and when I plugged it in, I got nothing. I then replaced the power supply with one I had recapped earlier, and the fan spun up, and it chimed. However, there was no video output, and when I looked inside to pull out the Maxell battery, I noticed that the area around some of the capacitors was covered in electrolyte. Upon pulling out the board, I noticed that a liquid had been spilled on the board at some point, as there was a brown goop around the back edge near the ports and on a few chips near the audio circuitry. The entire bottom of the board was also coated in a different type of residue. After cleaning the board with 91% IPA, it no longer chimes. What should I do to get the board working again?
  4. NickNick

    Playing audio cd's

    Hi everyone. Have a question. Is it possible to pop in an audio CD and have it played through the Macintosh? I have not been able to get this to work on any machine that did not physically come with a CD rom drive built in. Am I missing something here or??? I mostly want this for the pizza box macs like the LC, LCii, LCiii and the LC475's series computers. Thank you very much.
  5. Westinghouse

    12" RGB Display issues

    Hi All, Apologies if this is in the wrong category. Received a 12" RGB Display today, and the picture geometry is distorted. I've attached two images - one was shot vertically, and one was shot horizontally. Basically: the picture balloons out wider in the middle, there's a bright horizontal line, and a band above the bright line is stretched vertically. Hoping to find out which component is faulty, and if a fix is viable?
  6. First post. Woot! I thought I might share some knowledge and get some feedback on my process, but first the backstory. I have a Performa 640CD I acquired from a longtime client around 12 years ago. She donated it to me because the power supply failed from a lightning strike. I happened to have acquired a Performa 630CD around that same time, so I moved the 640CD logic board over to the 630CD chassis to test it. Lo and behold: the 640CD powered up. Life happened and I promptly forgot about the machine. I got back on a preservation/restoration kick the last couple of years and finally got back to the 640CD. Still no power supply, but I wanted to at the very least get started on preservation. I yanked the power supply from the 630CD and moved it to the 640CD so I could get the system working "au naturel". My primary goal was to convert the hard drive to CompactFlash. Good idea too, because on the first powerup, the original drive suffered a bone chilling head crash. Now to the point of the post. I couldn't find a single process anywhere after two days of 'net searching that details everything necessary to completely restore one of these machines from nothing if you don't happen to have the original software media. I pulled together several different resources and my other ancient cobwebbed Mac/PC knowledge to create a single set of instructions for restoring the software on one of these machines. I'd like folks input on my process: maybe there's some steps I can eliminate? A better set of software tools or installer disks I can use? At the very least, I wanted to share this process here so others who might someday need it could get use out of it. The process is several pages long so I'll link it externally. If that's frowned upon, I can post the entire process here. http://inanis.net/museum/quadraperformalc-630-software-restoration-process/
  7. I have a LC III and an LC II, and as you know, they have an empty FPU socket on them. It would be nice to put in an FPU in them, right? You know it. But I also have a couple of LC Ethernet Cards with an empty FPU Socket on them as well. Actually, of the 3 cards I got, 2 have a FPU in them (68882 @ 16MHz) and one has an empty socket. Its obvious that they were made for the LC. This got me thinking - the 68K can support multiple FPUs. So can I put in an FPU in the logic board and another FPU in the ethernet card? Though the CPU can support it, will the software support it? Will there be any improvement? What do you think?
  8. Elfen

    Another Squealing LC?

    This is an LC I bought as part of a deal because one of the ROMs was dead and would not boot. I recently got a new set of ROMs, put it in, and "BONG!" It's alive again! But it is squealing from the speaker, which is a sign of it needing a recapping job. But this LC was recapped, but I am using a PSU from another LC III. This LC III PSU is not recapped, but will be soon as soon as I get some caps. I do have a LC475 PSU that is recapped, and will test that tomorrow for right now I am tired. I'm suspecting the PSU as the cause the squealing. If so, I got nothing to worry about. I just need to recap a couple of PSUs and close up the machine and call it done. This is my first Mac Repair since "coming back." But what else can it be? Any ideas?
  9. I would never call another member's work as shoddy or terrible. In fact this LC board's recap was done better than what I could have in comparing it to those I did. And I praised him for it, he does great work. Sorry Uniserver, it's not you. I'm talking about CompuNerd. But this LC board still eludes me. At first I thought it was noise from the PSU. Nope. The PSU works fine and without noise on other LC Boards, including LC II, LC III and LC 475. So I decided to try a known perfectly working LC PSU from another LC III to this LC. IT SQUEALS!!! So it's not the PSU creating noise on the lines. But CompuNerd admitted long ago that he put one of the ROMs backwards on this board and killed the ROM. An honest mistake, we all done that at one time or another. So it took me a while to get a new set of ROMs, having to buy a complete set of 4 ROMs from ebay for $9. I replaced that 1 dead ROM and got the LC working again but it squeals heavily! Today I decided to replace the other three ROMs, and it still squeals but not as badly. Put back in the old ROMS and it squeals loudly. Replace the ROMs, and its quieted down but still squealing. Interesting... So part of the problem is solved but it is still there. Like Schödinger's Cat being there and not there at the same time. So I'm thinking, could a replacement cap have blown at the audio section from the ROM being placed backwards? To me they look fine under a magnifying glass. Voltage is OK. The problem is that it continues to squeal. Furthermore - with the ROMs replaced, it will quiet down after a long while (a 1/2 hour or so) to a white noise static background noise. Audio Amp Chip problem? To make sure that it is not remaining cap goo on the board causing this, I have washed this board again and again. Other than this "little problem" the machine works fine! CompuNerd did an excellent job of recappiing and repairing this board when he had it. Things happen and I'm not blaming him for anything bad with the board. Who knows, it may have had this problem all this time and long before CompuNerd got it! What you guys think - bad cap(s) or bad audio chip? This one really has my head scratching.
  10. Did some recapping of boards and an LC Power Supply (PSU) today. I had a few successes here and there. Thus I post a few things I learned in recapping my first LC power supply though I am already used too such similar jobs. The problem I had was the size of the caps. Uniserver's webpage ( http://maccaps.com/MacCaps/Capacitor_Reference/Entries/1990/10/15_LC_I%2C_II%2C_III_Power_Supplies.html ) was very beneficial and informative to this cause, but this is only a partial recapping which is fine with me. The caps in the LC PSU are tall and skinny. The caps I got are short and fat, I did not take into account the physical size of the caps. The caps replaced are as follows, as per his website: 2 - 270µf - 25V - ELNA - Long Life Radial 1 - 270µf - 10V - ELNA - Long Life Radial 1 - 56µf - 25V - ELNA - Long Life Radial Though all of the caps should have been replaced, past posts ad discussions with him tells me that these 4 are the most problematic, and I found that they had all leaked in the LC PSU. But the LC PSU is very tight on space and the smell of rotten fish rose when I started deoldering. Furthermore I did not have a 270µf - 10V, so I another 270µf - 25V in its place. But again, the problem here was the physical size of the caps. One of the two caps I had to have standing on its long legs so its contact to the heat sink would be minimal. Another cap could not fit into the space the old cap was in so again, giving it long legs I was able to place it in the tight space. At least the LC PSU is working again, but I will have to recap it one more time with tall skinny caps that ae rated higher in voltage by a bit instead of short fat ones I used now. BTW - the dead PSU is now working again and a dead LC is now living once more!
  11. This has been on my mind for years, and have never acted on it. But where does it say that an LC or Classic is stuck at 10 Megs of RAM? Most II Series data bus is 32 bits, thus making a 4MB address into 16MB of RAM in 32 bit. But the LC and a couple of others are 16 bits, which would make a 4MB address into 8MB of RAM in 16 bit. Thus the 10MB RAM size in an LC is just in 16 bits. If the bus can be expanded to 32 bits, it increases the RAM size to double! Since finding the Classic II and comparing it to the SE/30, there is very little difference between 16 bit Classic II and the 32 bit SE/30. The SIMMs share many lines. Thus is one can pull out the lines into a separate board to add RAM into the missing 16 bits, I believe one can expand the RAM to double on these machines. Looking at the Classic II, there are 4 - 4 bit X 1 Meg Chips - 44C1000-8, giving the board 2 MB in 16 bits. On a separate board with 4 more 44C1000-8, and have them share all but the Data Bus Lines and then line up each data bus line to the missing bits, you have just increased the RAM from 2 MB in 16 bits to 4 MB in 32 bits. Doing the same with 2 added SIMM sockets on the same board, you can now increase the RAM on the Classic II from 10MB to 20MB! Question is, would ROM Routines stop this? The ROMs themselves are in 32 bits - 4 - 27C010 EPROMS on my board; each 27C010 is 8 bits wide. 4 X 8 is 32. This is also true with the LCs So the question is, can it be done? In theory it can. In my mind I believe it can. So I provide a simple diagram from which a board can be drawn up. If you think that it can't, explain what you know. Don't just say that it can't, prove from what you know why it can't. Given time and money I will try to build such a board and try it on the Classic II. If successful, then I can design and create another for the LC's.
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