Ricoh · SC541

Fusing temperature — abnormally low / thermistor

Fusing system

Leave the machine powered on only if it is not smoking or smelling of heat. Do not open the fusing area. Note whether the code appears on warmup, during print, or at idle, then request a technician.

Ricoh · SC542

Fusing temperature — overheat / high-temperature protection

Fusing system

Power the machine off if it is unusually hot or has a burning smell. Do not touch the fusing area. Keep the room ventilated and request a technician — this is not a customer-replaceable part.

Ricoh · SC543

Fusing heater / lamp circuit

Fusing system

Do not open the fusing unit. A technician must verify heater continuity and connections. Request service.

Ricoh · SC202

Polygon / laser motor

Laser / writing unit

Do not open covers to the laser unit. Power-cycle once. If the code returns, request a technician.

Ricoh · SC490

Toner supply / bottle detection (model-dependent)

Toner supply

Reseat the toner bottle or cartridge that the display names. Use only the manufacturer’s supplies. Do not force a bottle. If the code remains, request a technician.

HP · 50.1

Fuser error (HP 50.xx family)

Fuser

Allow the printer to cool. Do not remove the fuser. A 50.xx code is a fuser-system fault — request a technician.

HP · 13.XX

Paper jam (HP 13.xx family)

Paper path

Open the doors the display indicates. Pull paper forward along the path — do not yank against rollers. Check tray corners and the duplex area. If jams repeat, request a technician.

Sharp · H2-00

Fusing thermistor / temperature (Sharp H2)

Fusing system

Do not open the fusing unit. Power off if there is heat smell. Request a technician.