The cl3500 is a laser printer and as such doesnt have a head per se.
you can remove the dev units and the k and cmyk pcu's and the image belt and using a flash light and a lint free cloth shine the light upwards and clean the led array, but typically if you have quality issues it will be either or all of the consumables which can be purchased from ricoh direct or from
http://www.katun.com/downloads/PrinterConsumables052009-NA.pdf
if this resolves your query please rate my answer accordingly
regards
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