Toner cartridge 1537 Duplexer Tray 2 Fast Infrared Receiver (FIR) port Figure 4. External assembly locations (3 of 5) Tray 3 cassette Figure 5. External assembly locations (4 of 5) 8 Chapter 1 Product information C7058-90936 s Tray 3 250-sheet feeder 1538 ette