One often-overlooked area is the exit sensor at the top of the printer. When paper exits the fuser, it pushes a small black plastic flag. If this flag gets stuck (often due to paper dust or a stray scrap), the printer logic gets confused and thinks a jam occurred, resulting in a permanent red light until the flag is freed.

The Samsung ML-1610 is widely regarded as one of the most reliable monochrome laser printers ever produced. Known for its durable build and inexpensive toner, it remains a staple in home offices and small businesses. However, even this workhorse has a common point of failure that leaves users frustrated: .

The Samsung ML-1610 communicates specific system states based on how the On Line/Error LED behaves: