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Thread: Zenith Z-171 gives error when booting from floppy?

  1. #1

    Default Zenith Z-171 gives error when booting from floppy?

    Whenever I try to boot my MS-DOS 3.3 disk, the system shows this error:
    BATTERY DEAD - SYSTEM HALTED

    Which battery would halt the system, and how can I replace it? Thanks!

    P.S. Iím also curious whatís behind the plastic door on the back. I canít get mine off at the moment.
    Looking for working: ThinkPad 755CD w/P75, IBM PC110, Macintosh PowerBook 100, Tandy TRS-80 Model 100/101/102, any Compaq SFF 286/386/486

  2. #2

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    UPDATE: I removed the back cover with the four screws. Behind the door is the RAM board and an unknown board. I determined the machine is tripping the low battery indicator due to s faulty floppy drive. I took the drive apart to check for any obvious failure, but I found nothing, so I moved the drive motor and read heads to make sure they weren’t stuck and reassembled everything. Now I have a new problem. I tell it to read the disk, and I here a faint buzz for a split second, and then nothing. The drive light doesn’t come on, and I can’t hear the disk spinning. But the computer no longer thinks the battery is dead, so I’m a bit further ahead. Any recommendation as to what to try next?

    Edit: I also found a ram chip (HM50256) with pin 5 bent in. I bent it back to normal. No change as far as I can tell.
    Looking for working: ThinkPad 755CD w/P75, IBM PC110, Macintosh PowerBook 100, Tandy TRS-80 Model 100/101/102, any Compaq SFF 286/386/486

  3. #3

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    UPDATE: did a little more testing. If I tell it to boot but leave the floppy cable unplugged it still tried to run the drive. So I’m sure it’s not a drive controller issue.
    Looking for working: ThinkPad 755CD w/P75, IBM PC110, Macintosh PowerBook 100, Tandy TRS-80 Model 100/101/102, any Compaq SFF 286/386/486

  4. #4

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    Switched the drives around and I’m back to square one. Any ideas?
    Looking for working: ThinkPad 755CD w/P75, IBM PC110, Macintosh PowerBook 100, Tandy TRS-80 Model 100/101/102, any Compaq SFF 286/386/486

  5. #5

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    Final update: I was using a “12V 5A” power supply, but apparently that’s not enough for the Zenith. It wants its original power supply (12V 2.5A, but also not chintzy garbage). So after fixing that, everything works again!
    Last edited by Capt. 2110; October 24th, 2018 at 11:02 PM.
    Looking for working: ThinkPad 755CD w/P75, IBM PC110, Macintosh PowerBook 100, Tandy TRS-80 Model 100/101/102, any Compaq SFF 286/386/486

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