Confirm correct fuse rating and actual burn symptom.
Fault route
LGK100L Burns Filter-Board Fuse Diagnostic
A branch-isolation workflow for LGK100L machines that burn the filter-board fuse after power-on.
Quick Answer
When the LGK100L burns the filter-board fuse at power-on, the source workflow separates the filter-board fuse, fan branch and control-transformer branch by unplugging related connectors.
- The listed fuse value is small; do not oversize it to mask a short.
- Unplugging the filter-board X3 branch and X5 branch is used to isolate the load that makes the fuse burn.
- If the fuse stops burning after a connector is removed, diagnose that branch before replacing unrelated boards.
Use this page when
- Filter-board fuse burns after power-on.
- You can isolate branch connectors safely.
- The goal is to locate which load branch overloads the fuse.
Do not use this page when
- Input breaker trips before the filter fuse evidence.
- The machine is completely dead without fuse burn.
- Only the display is missing while fan works.
LGK100L filter-board fuse route
Isolate the branch that makes the fuse burn.
Unplug X3; if fuse stops burning, diagnose that branch.
Unplug X5; if fuse stops burning, diagnose that branch.
Fan fault can overload the related filter-board path.
Transformer fault can overload the other branch.
Fuse isolation table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Filter-board fuse | Fuse burns; source note refers to small normal fuse rating around 3A. | Use correct fuse and isolate branch; do not oversize. |
| X3 connector unplug test | Fuse no longer burns after X3 is removed. | Diagnose the load on X3 branch. |
| X5 connector unplug test | Fuse no longer burns after X5 is removed. | Diagnose the load on X5 branch. |
| Fan | Faulted fan or branch load can burn fuse. | Disconnect/measure fan branch. |
| Control transformer | Shorted transformer branch can burn fuse. | Inspect transformer primary/secondary and wiring. |