Oki ES3640MFP Service & Troubleshooting Manual page 72

Errors in the 6xx range are User Clearable Errors. These errors indicate locations where paper
remains in the printer after a jam. These errors do not reference the actual jam, which is
referenced by 3xx errors.
631: Tray 1 Side Cover
632: Tray 2 Side Cover
633: Tray 3 Side Cover
634: Tray 4 Side Cover
635: Tray 5 Side Cover
637: MP Tray Side Cover
638: Paper Transport Path (Transfer Belt)
639: Paper Exit Path
640: Duplex Entry Path
641: Duplex Reversal Path
642: Duplex Transport Path
643: Finisher: Input Area
644: Finisher: Saddle Transport Path
645: Finisher Paper Stack Eject
646: Saddle Stack Eject
647: Inverter: Paper Eject
648: Inverter: Reverse Stacker Area
649: Inverter: Input Area