Around the toner cartridge, In the paper exit area – Samsung ML-3470D User Manual

ML-3470 Series, ML-3471ND-XAX, ML-3471ND-XBH, ML-3471ND-XIP, ML-3471ND-XAR, ML-3471ND-XEV, ML-3471ND-XAA, ML-3471ND-TMX