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Replacing the Proxxon LHW rectifier PCB
Last updated on Sep 2, 2026
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Introduction
Go to step 1 ↓The rectifier IC on this PCB fails frequently. You may hear a pop, see some smoke, and the machine will stop working. It is possible that the motor is damaged, causing the PCB to be destroyed; if you are lucky, however, only the PCB is defective. You can replace the entire PCB, although replacing just the rectifier is cheaper. The PCB is labeled Proxxon 28547-28 or 28547-28B.
What you need
Tools
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Two types of the PCB are shown here. Both can be used.
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These PCBs are for the device without cruise control.
Ask FixBot
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Remove the four very long Torx T10 screws next to the power cable that hold the device together.
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Pull the device apart until four parts are visible:
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Power connector with power switch
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Rectifier board
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Motor
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Drive
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Desolder the two power cables.
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Desolder the two motor cables.
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Image 2 shows a rectified PCB that has already been repaired. Two additional wires were soldered on because the conductive tracks had partially flaked off. You can also use a new PCB.
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Follow the steps in reverse order to reassemble your device.
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