This document outlines a known issue with the Compaq LN40 and LN40A laser printers involving high amounts of toner or developer spillage, particularly toward the front of the printer. Field engineers are advised to clean the printer interior and the OPC drum cartridge's pre-charger before considering replacement of the developing unit. The document also notes that accumulated toner residue on the transfer charger can cause arcing, leading to printer hangs during hard disk access and "FUSER JAM 4" errors. Field engineers experiencing these issues are instructed to contact the Customer Support Center (CSC).
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