Allen Bradley 8520-32MB3 Motherboard
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CSL Part Number: 81006
Product Overview: The Allen Bradley 8520-32MB3 is a motherboard for 9/Series CNC systems, specifically the 9/260 and 9/290 models. It provides core processing, power regulation, and interfacing for CNC machine tool controls. The board incorporates an FPGA (U29), RS-422/485 line drivers for serial communication, flash memory card slots, a voltage regulator managing +12V switching supplies, and a 16MHz crystal oscillator. It connects to servo modules, encoders, and display outputs to coordinate multi-axis motion control in industrial machining applications.
Category: Mother Board
Manufacturer: Allen Bradley
Manufacturer Synonyms: Rockwell Automation, allan bradly
Manufacturer Part Number: 8520-32MB3
Series: 8520 9/Series CNC Hardware
Common Failures
Several common issues have been identified in units received for evaluation, including motherboard fault indicators and absence of video signal. Corrosion or deposits on flash memory cards have also been observed, along with failed components in the RS-422/485 driver circuits and power regulation sections.
Repair Approach
Our evaluation process typically involves inspecting and testing critical components such as differential line drivers and oscillator crystals. When feasible, cleaning of memory cards is performed, though heavy corrosion may limit repair options. In some cases, extensive damage or the inability to isolate the fault may result in a determination that the unit is Beyond Economic Repair.
Testing & Quality
Diagnostic testing may reveal irregular voltage levels or other indications of power regulation concerns. We perform comprehensive evaluation and testing to identify the scope of repair work required. In cases where faults cannot be resolved or the repair cost exceeds the unit's value, the item may be returned without repair, and the customer will be notified accordingly.
Service and repair your broken Allen Bradley part
We can repair your Allen Bradley model 8520-32MB3 in our facility. Let our skilled technicians get your Allen Bradley back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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