Gestetner MP2501 - Error code SC554-00

[slimslob]

Considering the lack of training and experience it might be better to replace the entire fusing unit. Initial problem may have been a shorted triac on the PSU or a problem with the BICU(if he had a service manual he would have known that). In either case it will blow the new fusing unit if not fixed. See if you can buy an operational used MP2501 for use as a parts machine. Might be less expensive than a BICU.

[GIUBOSS]

there are no technicians in my area. I just wanted to know what it is

if you don't find better try here
iStudio – Partner Ricoh Matera

[Gab]

You need to replace at least press roller, because its coating damaged.
If the problem is overheatting you must replace thermistors and thermostats too.
Try to find what caused this damage.
As i can see you remover fuser unit from machine so send it to a Ricoh technician to do alla the job