Ricoh Be-C2, Technical Training Manual

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It’s a single wire, but it’s looped so there are actually two wires crossing the
drum.
The main point to note about this unit is that the grid consists of a number of
parallel wires strung along the length of the charge corona unit.
The mesh-type grid system is a better method. However, it is not used in
wide format machines. In this type of machine, there may be excessive
tension in the grid, deforming the mesh. So the strung-wire system is used.
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