Canon iR4570 Series Service Manual page 327

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3) Slide the developing assembly [1] slightly to the
front; then, disconnect the connector [2].
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4) Remove the developing assembly [1].
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Be sure to hold the developing assembly as shown.
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When fitting the developing assembly, be sure to fit
the lower right segment [2] of the developing
assembly [1] in the rail [3] of the machine. Thereafter,
slide the developing assembly so that [A] of the
developing assembly matches [B] of the rail.
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Chapter 7
7-51