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IndustryArena Forum > MetalWorking Machines > Bridgeport Machines > Bridgeport EZ Trak DX Motherboard Troubleshooting
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  1. #1
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    Jun 2022
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    Bridgeport EZ Trak DX Motherboard Troubleshooting

    I'll begin with the full story on this machine. I just got it a couple weeks ago. It had not ran in several years, but I know it ran when it was last powered down. It came from the company I work at so I've been around it for many years.

    I'm using single phase power in a home shop. I was able to rewire the spindle motor controls to use a VFD to convert the single phase power into 3 phase for the motor. Basically, I left the original motor contactors wired up like they were except I removed the three phase power leads to them. Now, I'm using the contactors to open and close contacts to control the VFD. Worked pretty well, and the original spindle control panel works just like it did originally. I did make sure to leave the L1 and L2 leads that feed the transformer in tact.

    I did confirm that the transformer is getting single phase, 245VAC and the taps/jumpers are set up for that. Voltage going to the motherboard's power supply is 118VAC. When I first powered the machine up, the control screen displayed a CMOS battery low error, press F1 to continue. Obviously, the CMOS battery needed to be replaced. I had to remove the mother board to find the battery. It's a real time counter with a battery built in...I had never seen one, but I was able to find a replacement. You have to solder it in. I have NOT installed it yet. My plan was to reinstall the mother board and hook up a PS2 keyboard so that I could get into the BIOS to copy all of the settings before replacing the battery. While I had the motherboard out of the machine, I did accidentally slide it off a table and it dropped to the floor. It landed fairly flat and no damage could readily be detected. After reinstalling the motherboard, it now does nothing. The screen displays nothing, and the floppy drive does not light up like it's trying to boot up from it.

    My first inclination is that, yeah, I damaged the motherboard when I dropped it. I just want to make sure before I buy a new one. I was wondering if there were any tests that I could do to confirm that it is the issue. I did confirm that the PC power supply was outputting 5VDC from red to black, and 12.5VDC from yellow to black. All 4 led's on the back plane come on. I'm assuming that it doesn't matter what slot I install the motherboard in? I'm also assuming that the motherboard gets power through the backplane? I couldn't find anywhere else to get power to it. I know the monitor is good because I saw it display stuff early on.

    I was going to try installing the new CMOS battery that I've got, but I doubt that will make a difference.

    Is there any other diagnostics that I can do on the motherboard? Is there anything else that might cause this issue? I found a motherboard at BPTparts for $600. Is there a better place to get one?

  2. #2
    Community Moderator Jim Dawson's Avatar
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    Dec 2013
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    5601

    Re: Bridgeport EZ Trak DX Motherboard Troubleshooting

    Maybe try reseating the CPU?
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
    Member
    Join Date
    Jan 2005
    Posts
    14302

    Re: Bridgeport EZ Trak DX Motherboard Troubleshooting

    Quote Originally Posted by camerong View Post
    I'll begin with the full story on this machine. I just got it a couple weeks ago. It had not ran in several years, but I know it ran when it was last powered down. It came from the company I work at so I've been around it for many years.

    I'm using single phase power in a home shop. I was able to rewire the spindle motor controls to use a VFD to convert the single phase power into 3 phase for the motor. Basically, I left the original motor contactors wired up like they were except I removed the three phase power leads to them. Now, I'm using the contactors to open and close contacts to control the VFD. Worked pretty well, and the original spindle control panel works just like it did originally. I did make sure to leave the L1 and L2 leads that feed the transformer in tact.

    I did confirm that the transformer is getting single phase, 245VAC and the taps/jumpers are set up for that. Voltage going to the motherboard's power supply is 118VAC. When I first powered the machine up, the control screen displayed a CMOS battery low error, press F1 to continue. Obviously, the CMOS battery needed to be replaced. I had to remove the mother board to find the battery. It's a real time counter with a battery built in...I had never seen one, but I was able to find a replacement. You have to solder it in. I have NOT installed it yet. My plan was to reinstall the mother board and hook up a PS2 keyboard so that I could get into the BIOS to copy all of the settings before replacing the battery. While I had the motherboard out of the machine, I did accidentally slide it off a table and it dropped to the floor. It landed fairly flat and no damage could readily be detected. After reinstalling the motherboard, it now does nothing. The screen displays nothing, and the floppy drive does not light up like it's trying to boot up from it.

    My first inclination is that, yeah, I damaged the motherboard when I dropped it. I just want to make sure before I buy a new one. I was wondering if there were any tests that I could do to confirm that it is the issue. I did confirm that the PC power supply was outputting 5VDC from red to black, and 12.5VDC from yellow to black. All 4 led's on the back plane come on. I'm assuming that it doesn't matter what slot I install the motherboard in? I'm also assuming that the motherboard gets power through the backplane? I couldn't find anywhere else to get power to it. I know the monitor is good because I saw it display stuff early on.

    I was going to try installing the new CMOS battery that I've got, but I doubt that will make a difference.

    Is there any other diagnostics that I can do on the motherboard? Is there anything else that might cause this issue? I found a motherboard at BPTparts for $600. Is there a better place to get one?
    Yes, you could check all the chips that can be changed are seated correctly, we have a board the same I will attach a photo and you can check, you don't have to do anything with the Bios when you change the battery they are saved on the board

    An option is a single board computer will work also but you need to make a back plane to mount it, you can up grade to a better computer as well
    Mactec54

  4. #4
    Member
    Join Date
    Jun 2022
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    2

    Re: Bridgeport EZ Trak DX Motherboard Troubleshooting

    There were no removable chips on my motherboard. I ended up replacing it. Machine seems to work fine now.

  5. #5
    Member
    Join Date
    Jan 2005
    Posts
    14302

    Re: Bridgeport EZ Trak DX Motherboard Troubleshooting

    Quote Originally Posted by camerong View Post
    There were no removable chips on my motherboard. I ended up replacing it. Machine seems to work fine now.
    The CPU would of been removeable. most likely a main power connection that is faulty as the board did nothing. don't throw the old board away as it is most likely a simple fix
    Mactec54

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