Here below show you how to repair FDS driver. Normally FDS will not damage easy. But I think all FDS is belt broken
Belt had been melted
Put new belt back to FDS
Use Copy Master software to tune FDS speed 1 : fastest , 9 : slowest ** Copy Master is from BUNG
When Pressure cotton very thin, then you need to replace it. If not, it will be easy to get error 27
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