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  1. #1
    Try RS Components. Have you tried unplugging the optos to see if that still blows the fuses? There is also a transistor or voltage regulator standing up just behind the fuse. Whats the part number on it? This could be faulty as well.

  2. #2
    dudz's Avatar
    Lives in Dunedin, New Zealand. Last Activity: 09-02-2025 Has a total post count of 295. Received thanks 2 times, giving thanks to others 79 times.
    Quote Originally Posted by Web Goblin View Post
    Try RS Components. Have you tried unplugging the optos to see if that still blows the fuses? There is also a transistor or voltage regulator standing up just behind the fuse. Whats the part number on it? This could be faulty as well.
    I took the two stepper motor driver chips out (x and Y). Put new fuses in... now all 3 power LED's come on and the fuses don't blow. Chip number A3977SEDT A 1201 917M

    I checked RS ....
    Buy Motor Driver ICs Stepper Motor Driver, Dual Full PLCC44 Allegro Microsystems A3977SEDTR-T online from RS for next day delivery.
    Swedish Storbro Luna - 3 axis CNC mIll - 250 - 2500rpm / 1.1 tonne

    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle..... CSLAB CSMIO/IP-M 4-axis Ethernet Motion Controller....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  3. #3
    dudz's Avatar
    Lives in Dunedin, New Zealand. Last Activity: 09-02-2025 Has a total post count of 295. Received thanks 2 times, giving thanks to others 79 times.
    Then here is Ebay.... (I think they are the same spec ? )
    NEW Allegro A3977 STEPPING STEPPER MOTOR DRIVER | eBay
    Swedish Storbro Luna - 3 axis CNC mIll - 250 - 2500rpm / 1.1 tonne

    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle..... CSLAB CSMIO/IP-M 4-axis Ethernet Motion Controller....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

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