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sc302 is usually PCU or charge roller.
As you say you have recently replaced the Drum/PCU, is the drum turning correctly?
Check charge connectors and connectors on the back of the pcu. To reset that code, simply turn main power off and on again. If problem comes right back....the machine detects the cause still exists. May be an issue with the HVT.
theres no e5 on aficio 450must be sc542/546 problem with heater try to reset code press yellow
button then 1 0 7 then press red button keep the red button held down 4 secounds then select
copy 1 turn copier off then switch back on