When is it absolutely necessary to call a professional technician for the Ricoh SC 544-01 error, rather than attempting DIY repair?

It is absolutely necessary to call a professional technician if basic troubleshooting (power cycling, checking for jams) does not resolve the SC 544-01 error, if you are not comfortable or trained to work with high-voltage, high-temperature components, or if the error recurs after a temporary fix. Fuser unit repair or replacement often requires specialized tools, diagnostic equipment, and expertise to ensure proper installation and safety, making it best suited for certified technicians.