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Thread: 8" and 5.25" Floppy Drive Sales, And Repair

  1. #1

    Default 8" and 5.25" Floppy Drive Sales, And Repair

    I've been involved in the repair and sales of 8" and 5.25" floppy drives since the 1970s.

    Contact me if you're having trouble, and I be happy to provide free advice.

    If your drive/s need need repair, I'll be happy to repair and align them (for a fee).

    And if you need drives, I usually have some in stock, ready for delivery.

  2. Default

    Some people have inquired as to what brands and sizes of floppy drives I can work on, and stick parts for.

    I specialize in 8" floppy drives, but also work extensively on 5.25" mini-floppy disk drives. I can work on any 8" or 5.25" drive that uses the standard 50 conductor (8") or 34 conductor (5.25" drive connectors. The equipment that I use to control the drives while testing and repairing works on the standard interfaces, so I'm sorry but I can't work on drives that use non-standard interfaces like early (Apple II) drives. I do not have the alignment disks or circuit diagrams to work on 3.5" drives either.

    My drives of choice are Shugarts, but I also have worked on all the other major brands drives like Mitsubishi: Qume, Tandon, Siemens, NEC, Panasonic, Wang, Pertec, MFE, JVC, and Teac. I have the Factory Service Manuals for these other brands because having the circuit diagrams is necssary to pick out the test points, and to trouble-shoot logic board problems.

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    If you are looking for 8" floppy drive parts, I have Shugart (SA800, SA801, SA850, SA851, SA810, SA860), Mitsubishi (M2896-63), and Qume (DT8, DT842, DT242) drives that I am parting out.

    I have working Shugart (SA800, SA801, SA850, SA851) AND Mitsubishi M2896-63) 8" drives in stock for sale that have been aligned and tested that include a 6-Month Warranty.

    I can test, repair, and align your 8" floppy drive/s if you need it/them serviced.

    Michael

  4. #4
    Join Date
    Mar 2009
    Location
    Pleasant Hill, CA USA
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    Default

    Might be a good idea to put a location in your profile. This helps people get a sense of the shipping cost to get the drives to and from you. Does not have to be your exact address, just the state would suffice.

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

  5. #5
    Join Date
    Jun 2016
    Location
    Guisborough, England
    Posts
    165

    Default

    Hello Michael,

    Since you raise the issue....

    I have the disk drive unit (only) from an old IBM DisplayWriter system. This contains two 8" drives. I believe one is a lower density drive, and the other is the higher type.

    The unit is clean, and inside all looks clean, not even THAT dusty. I have manuals for the unit, incl Circuit diags and troubleshooting.

    This does NOT use the standard connectors mind you, it's a plug/socket like the standard serial connector, but longer.

    What might be my chances of ever getting such drives working, say with a CP/M machine? Might a PC be a better bet?

    I have some 8" disks, but I don't have a boot disk.

    Geoff

  6. #6

    Default

    Sorry about the delay in answering your question, but you are not going to like the answer. The odds of getting those special IBM drives to work as normal/standard 8" drives is slim to none. they don't have any value to someone that uses standard drives. IBM did not even continue with the special drives. Eventually they went to standard drives.

    You best bet is to find someone who is using an IBM machine like the one that the drives came from and unload them on that person.

    Quote Originally Posted by GeoffB17 View Post
    Hello Michael,

    Since you raise the issue....

    I have the disk drive unit (only) from an old IBM DisplayWriter system. This contains two 8" drives. I believe one is a lower density drive, and the other is the higher type.

    The unit is clean, and inside all looks clean, not even THAT dusty. I have manuals for the unit, incl Circuit diags and troubleshooting.

    This does NOT use the standard connectors mind you, it's a plug/socket like the standard serial connector, but longer.

    What might be my chances of ever getting such drives working, say with a CP/M machine? Might a PC be a better bet?

    I have some 8" disks, but I don't have a boot disk.

    Geoff

  7. #7

    Default

    Quote Originally Posted by lutiana View Post
    Might be a good idea to put a location in your profile. This helps people get a sense of the shipping cost to get the drives to and from you. Does not have to be your exact address, just the state would suffice.
    Dj vu...
    ☀☀☀ Visit Take Another Step for both computer and non-computer related discussions. ☀☀☀

    If you're looking for DS/DD or DS/HD 3" or 5" floppy disks, PM me. I've got some new, used, and factory over-labeled disks for sale.

    There is a crack in everything. That's how the light gets in. -- Leonard Cohen

  8. #8

    Default

    Is there anyone out there that can repair 8" Flexible Disk Drives from Magnetic Peripherals? The "Equip. Ident. N." is BR8A8-A and the "Part Number" is 77618023 (but I think this can vary).

  9. #9

    Default

    Hello, Ive been trying to get Siemens FDD-100-C/D/E drives running again and Im running into two problems: (1) the protect/write-inhibit logic or sensor seems bad on 2 out of 3 drives tested. From the Siemens manual I can find the trace I need to cut to fix that problem. (2) On all of these old drives, the head refuses to seek/return to track zero. I am able (with the power off) to manually turn the screw to put the drive in the track zero position and when I do that, the drives are able to read and boot from diskettes. Im assuming there is something wrong with the track zero logic and/or sensor but lack the know-how to trace the problem. If the issue is the head motor, I dont know where to find a replacements. Would appreciate any help with this!! Thanks, Tom

  10. Default

    Quote Originally Posted by lowrybt View Post
    Hello, I’ve been trying to get Siemens FDD-100-C/D/E drives running again and I’m running into two problems: (1) the protect/write-inhibit logic or sensor seems bad on 2 out of 3 drives tested. From the Siemens manual I can find the trace I need to cut to fix that problem. (2) On all of these old drives, the head refuses to seek/return to track zero. I am able (with the power off) to manually turn the screw to put the drive in the track zero position and when I do that, the drives are able to read and boot from diskettes. I’m assuming there is something wrong with the track zero logic and/or sensor but lack the know-how to trace the problem. If the issue is the head motor, I don’t know where to find a replacements. Would appreciate any help with this!! Thanks, Tom
    If the drives will read the boot disk after you manually set the head to Track Zero, I would say your problem is that the Track Zero Sensor needs to be adjusted. If the Track Zero Sensor was not working at all, manually repositioning the head assembly would not help.

    The way that Track Zero works on most 8" drives, is a mechanical flag mounted to the head assembly interrupts a light sensor mounted on the chassis towards the rear of the floppy disk, two-four motor steps before the heads reach Track Zero on the floppy disk. The drive's logic keeps track of when the Track Zero sensor indicates the Track Zero Sensor flags, and knows that the next time the stepper motor located to Zero Winding, the heads are located at Track Zero.

    When we use an alignment tester, or oscilloscope and a alignment disk to find Track Zero. We move the drive's head stepper motor to the Zero Winding, then mechanically adjust the head assembly so we can read the Track Zero Signal on the alignment disk.

    It sounds to me like the Track Zero Sensors on your drives are working, but the Track Zero Flags on the head assemblies are mis-adjusted, so the flags are tripping the Track Zero sensor too early or too late.

    IF the drives were sent to me for service, I would start by set the head alignment, then set the Index alignment, and then reset the Track Zero Sensor alignment., before testing the drive on a computer for proper operation. You must set the head alignment first, so you can accurately set the Track Zero Sensor flag to the write track so it will flag before the head reaches Track Zero.

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