I have this problem on two machines,AF2060 and MP6000 both fusers are ok, with no visible problems,both have brand new parts with AF 2060 having "for use" parts (loads of other machines use those parts without any problems) and MP 6000 having Ricoh parts.
Both machines melt cleaning web to the orange web pressure roller,web assembly gears and engines are ok and working without problems,I tested it removing them out while connected to fusers,cheat doors and run SP 5804 55.
Owner of AF2060 had SC 542 and tried on his own to reset it with SP5801 002 (thanks world wide web...) to see his fuser melt both hot and pressure roller in place.
Aside from him making mistake to reset SC the wrong way I'm afraid that even proper resetting of any fuser related SC on both machines may cause them to melt rollers.
At first I thought that bent or dirty thermistors may cause problems,but even old ones were clean and in proper place leaning on hot rollers,I replaced thermofuses thinking they should have broken the curcuit when overheat was detected but melting still reappears probably because web melting temperature is lower than thermofuse braking temp,new web also didn't help.
This all leads me to conclusion that machine doesn't start rotating fuser when it should,misread temperature can make hot roller hotter than it should be but machine won't rotate until it's just right causing hot roller to melt web.
While I'm on the field I monitor the center and end thermistor temperature,measuring shows both center and end temp to follow each other equal from 180c up to 199c give or take.
I'll go there again to try it out with PSU or BCU board,maybe fuser harness but before I do maybe there are some thoughts or experiences on this around here.
Thanks.
Both machines melt cleaning web to the orange web pressure roller,web assembly gears and engines are ok and working without problems,I tested it removing them out while connected to fusers,cheat doors and run SP 5804 55.
Owner of AF2060 had SC 542 and tried on his own to reset it with SP5801 002 (thanks world wide web...) to see his fuser melt both hot and pressure roller in place.
Aside from him making mistake to reset SC the wrong way I'm afraid that even proper resetting of any fuser related SC on both machines may cause them to melt rollers.
At first I thought that bent or dirty thermistors may cause problems,but even old ones were clean and in proper place leaning on hot rollers,I replaced thermofuses thinking they should have broken the curcuit when overheat was detected but melting still reappears probably because web melting temperature is lower than thermofuse braking temp,new web also didn't help.
This all leads me to conclusion that machine doesn't start rotating fuser when it should,misread temperature can make hot roller hotter than it should be but machine won't rotate until it's just right causing hot roller to melt web.
While I'm on the field I monitor the center and end thermistor temperature,measuring shows both center and end temp to follow each other equal from 180c up to 199c give or take.
I'll go there again to try it out with PSU or BCU board,maybe fuser harness but before I do maybe there are some thoughts or experiences on this around here.
Thanks.
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