Fuser roller temperature increase problem

1 Check the continuity of H1 and H2. NO: Replace the H1, H2. 2 Check the continuity of TS1. NO Replace the TS1. 3 Check to see if the resistance of TH1 is infinite. (Between CN18-1 and 2 on thermistor side) YES: Clean TH1 or replace the Fuser Unit. NO: Replace the PU. Replace the PWB-A.