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    Schrockwell's S3/30 Reloaded build

    I think I have a few spares of the oscillator (new), DM me if you need any.
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    Schrockwell's S3/30 Reloaded build

    I bought this one from Amazon and it is big enough to hold the minority of the SE/20 logic board on top of it. Be careful not to put SIMM area directly on it or protect the plastic tabs on the back. After the temperature reaches the setting you can just pick any PLCC easily just with a little...
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    SE/30 Clocks

    16.9344 quartz is for the audio, if you change it then the sample rate like 11.025KHz/22.05KHz will change and will sound off.
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    Macintosh SE/30 M5119 - Restoration

    It seems that you need to check more basic functions of the board. I remember you already checked all the power rails. 1. Reset signal generated by UB11, search for "Reset*" signal in your schematic and it is on pin 5 of UB11. press the reset button and see if this signal go down to 0 from 5V...
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    Macintosh SE/30 M5119 - Restoration

    Yes, remove the ROM first. Start from A2. It should look like a clock signal since the CPU will “walk” every address sequentially. A3 will look like clock half the frequency as A2, etc. sometimes you only see a quick pulse then you should wait a while for all capacitors on the board to...
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    Macintosh SE/30 M5119 - Restoration

    If the ROM is not running at all or not to the point start communicating through serial port, then you'll not get anything. My previous experiences using Techstep and fixing many SE/30 logic board, typically you'll hear at least a death chime. I read through this post briefly and I don't see any...
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    Macintosh SE/30 M5119 - Restoration

    SE/30 will not boot without ASC. I tried it on multiple boards. (simasimac) 26LS30 will not prevent a boot TL071/Q1/Q2 issue will make you unable to hear the death chime if there's one from the speaker, they are audio amplifier/driver to drive internal speaker. Line-out jack should work fine...
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    SE/30 bad SCSI bus?

    How is the HD image in the SD card made? An image with incorrect driver inside will definitely cause this.
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    MP-F75W schematics available?

    There are many many different versions. 2SB624-BV3 is shown in above Bomarc schematics. They are interchangeable
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    MP-F75W schematics available?

    I only have schematic on 800K drive. Parts around stepping motor should be the same. There is nothing else between controller chip, HA13412 and the motor and you already swapped two of them. Could you check the TRK0 signal from the zero track detector? At power up the stepping motor will keep...
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    Floppy Drive M0130 400K with insertion and ejection problems

    Did you check the switch for the ejection mechanism with a multimeter that it will actually open/short properly? I think the floppy drive need this switch to indicate the position of the eject motor, pressed by the white cam. -Yi
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    Mac 128K - 400K Floppy Drive Question or Issue

    I recently cleaned 3 or them, one from a original 128K, one from a 512K and one from external floppy. All of them are basically working correctly after I cleaned the old grease on the stepper motor gear thoroughly, it is not obvious how thick they are until you try with a sharp twizzer tip. Make...
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    Color Classic Mystic VGA Mod Strange Resolutions Results

    I still believe there is something wrong with your sense line mod in analog board. Could you take a picture on that area? For VGA Mode you have to connect Sense Line 0 and Sense Line 1 to each other, while Sense Line 2 is left unconnected. For HiRes Mode you have to connect Sense Line 0 to...
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    Color Classic Mystic VGA Mod Strange Resolutions Results

    Your photo shows original LC575 resistor locations. 0ohm on R116 and no resistor on R109. It should work fine with the analog board mod. You would only need to modify those resistors, OR ResEdit to make LC575 board work with an Unmodified color classic analog board. A proper VGA mode should...
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    Mystic Color Classic VGA Mod Rev D Analog Board Black Bars

    Please also check https://colourclassicfaq.com/general/vga.html. I just did the same mod last weekend without any issue. I think you might mixed the mod to the horizontal voltage (7 to 12 is vga mod) and mod to the sense lines (only isolate pin 20 is hi-res mod). I also isolated pin 25 and added...
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    Mystic Color Classic VGA Mod Rev D Analog Board Black Bars

    7 to 10 is called “high-res” mod that will put voltage to 84V from original 60V. 7-12 will only put voltage to 68.4V which is considered much safer in the long term.
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    Mystic Color Classic VGA Mod Rev D Analog Board Black Bars

    Please check this link: https://powercc.org/640x480/. In the later section about geometry adjustment after the VGA mod, there're some tips to shrinking black borders.
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    Broken rheostat on Mac SE

    If the black part is missing in your case, maybe someone in this forum can spare one whole part?
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    Broken rheostat on Mac SE

    As you can see in the photo. There is no “screw” in the coil. You can just use a hex tool (you must not use metal tool when powered on otherwise the tool will get hot and burn your hand). I normally use a trimmed q-tip for this adjustment. You will notice the black part I marked in the photo to...
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    Broken rheostat on Mac SE

    Any photo? Hard to imagine which part you are referring to (little adjustment screw) thanks.
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