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| Macintosh LC II Sony Floppy MFD-75W-01G or swim problems |
Posted by: Madcat333 on 2023-05-01 01:58:23
Hello there,
i desperatly couldn't get my floppy drive to read disks. I've recapped the logic board and the floppy drive. After that the drive works and i could get into the system install screen. But the next day it refuses to read the install disk and it ejects it. The happy mac showed up for 1..2 seconds then it ejects it. I checked the disc on another system. It was readable just fine. I tried to align the Track 0 sensor with try and error method, but i only got the happy mac back for 1..2 seconds. Then i checked the traces and voltage ratings between the swim and the 20-pin header. Unfortunately i only found a pinout from the Apple II with a -12V line on pin 9 which the LC II does not have. I have the bomark schematic also with no pin 9 on it. What are these PH0... PH3 lines for? And is the 0.3 mV (0V) normal on PH1? I don't know if the swim chip or the floppy drive is bad. I've tried 2 Sony Superdrives with no luck. |
Posted by: volvo242gt on 2023-05-01 11:31:51
If both drives aren't working, then it's probably a board issue. Could be the chip itself, a rotted trace (or more), or some cap goo that got on the chip's pins. |
Posted by: joshc on 2023-05-02 02:07:03
Are you sure the disks you're using are OK? |
Posted by: Madcat333 on 2023-05-03 14:37:07
I checked the disk on a iBook with ext. floppy. It's a system 7.0.1 install disk 1. |
Posted by: Russianv on 2025-01-18 21:57:23
Hello there,
i desperatly couldn't get my floppy drive to read disks. I've recapped the logic board and the floppy drive. After that the drive works and i could get into the system install screen. But the next day it refuses to read the install disk and it ejects it. The happy mac showed up for 1..2 seconds then it ejects it. I checked the disc on another system. It was readable just fine. I tried to align the Track 0 sensor with try and error method, but i only got the happy mac back for 1..2 seconds. Then i checked the traces and voltage ratings between the swim and the 20-pin header. Unfortunately i only found a pinout from the Apple II with a -12V line on pin 9 which the LC II does not have. I have the bomark schematic also with no pin 9 on it. What are these PH0... PH3 lines for? And is the 0.3 mV (0V) normal on PH1? I don't know if the swim chip or the floppy drive is bad. I've tried 2 Sony Superdrives with no luck. Hi, did you ever managed to solve this? |
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