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techknight

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  1. techknight

    SE/30 does not boot

    Well, if it has one of those Quantum hard drives, its of no surprise this is happening.
  2. techknight

    LC575 screen

    Unless the thing has 50,000 hours on it and the CRT has gotten weak. its rare, but I have seen a couple computer monitors this has happened to. IBM PS/2 monitors being one of them, I have an IBM PS/2 monitor that the CRT has been worn into the ground. Has burn-in of course, but the emissions from the electron gun are so weak, turning up the brightness has severe color bleeding and blooming. Thats how you know the CRT is done for. Surprisingly, I found a NOS replacement. Havent changed it out yet though.
  3. techknight

    Apple 13" Monitor failing

    Ohh ok, thanks for clearing that up. These particular monitors are KNOWN for capacitor issues, so that is likely the cause. Sometimes the flyback housing can crack and start developing arcing points, but youll smell the corona it gives off if this is happening. More than likely though, you have bad caps, especially the two or three near the horizontal drive stage.
  4. techknight

    Mac plus probing signal at J8 pin 1

    It could be. You would have to try a known good PAL from another logic board if you had one. otherwise, you would have to burn a new PAL which I dont think the bitstream files are out there for the Plus.
  5. techknight

    LC575 screen

    The trinitron CRTs are pretty much all the same. that CRT, (if its the same size) can fit in some of the other Apple Trinitron monitors of the same size. I know some of those displays were actually 13" but the CRT may still be the same.
  6. techknight

    Mac plus probing signal at J8 pin 1

    Your video signal is kinda weak. Might need to look into that. Check the CRT Neck board for a shorted video driver transistor, and/or check the logic IC on the analog board where the video is gated through. Also probe the video signal on the logic board as well. it seems as if the signal for the video is being damped for some reason.
  7. techknight

    Apple 13" Monitor failing

    I would almost need to see a picture of what your describing. CRT Monitors are very complex little devices and it can be many different things to cause those symptoms. Could be capacitors, could be the video amplifier IC, could even be the flyback itself.
  8. techknight

    Portable & SCSI2SD Questions

    Im worried. Changing the 9V batter should not have changed anything with the system turning on or off. All that battery is for, is when you slide the battery cover off, it switches into the circuit to keep the memory maintained. Until you slide the battery cover back on. the 9V battery servs no other purpose. So if changing the 9V battery made a difference, that tells me your battery latch switch is either bad, or the tab is broke off your battery cover. The portable wont last long in this manner.
  9. techknight

    SE/30 Video Section Replacement Parts

    As long as you match the LS for LS,. and F for F, you should be fine.
  10. techknight

    SCSI to Ethernet Adapter on New Hardware

    Good thing about using an ARM Cortex, you can get speed improvements of course, and then since the firmware is written in C, it should be fairly easy to port over without doing too much work, but you would have to replace the ASM routines though. Regardless, this is a really nice project Honestly, with a littel bit more cobbling, you can probably replace the ethernet PHY with an ESP8266.. and then use some of the WiFi driver development done by ants, combine the two, and you have one really badass product, with a wifi icon in the menu bar to boot! Then, if its miniature enough, it can be put inside vintage powerbooks, replace the internal HDD, and gain wifi support at the same time? HELL yes!
  11. Depends on how you comprehend the term "Upgraded" Because Upgraded could mean something as simple as just replacing the PCMCIA adapter with the upgraded newer version. It could go either way. There is a flash ROM on the PCB so anything is possible, but if the control IC itself is different, its hard to code around that.
  12. techknight

    TDK LC supply still clicking after recap

    @LaPorta Definite brain fart ol buddy... Check the opto-isolators.
  13. techknight

    Asanté EN/SC Setup?

    Depends on what website your trying to open. 90% of them are broken on browsers THAT old. You could try phils old radios. its a vintage site. But even then, its using SSL so dunno.
  14. Weird. my post disappeared.... I didnt see the pictures prior, they woudlnt load for me when I typed my message. So in the case of the expansion card, I dont know. My thought would be to remove it. But I do know the ROM generates an E code if it is unable to write to something.
  15. It can also do this if the power supply cant go into regulation. Like bad caps, open photo-couplers, etc..
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