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Hello sir; this error code require reset the procedure as follow;
1, press "#", "interrupt", "clear", "interrupt".
2, enter 14, press start.
3, turn power off and back on
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The error code H4 means that you have a problem with the fixing unit. It could one of the item's > The thirmistor or thermal fuse or the fixing heater lamp
U2 40 is a CRUM comunication error with the toner (wrong toner chip on toner cartridge or wrong toner cartridge) try a new toner.
H4 is a fuser trouble code. Check to make sure all conection are right, Theres a few posible problems for H4, power board, MCU board, thermistor, or broken heat lamp.
Dear sir
H4 signal is fuser unite problem please call a technician they solve this problem.Just we serve problem location because i am not live your area.
Thanks
Tareq
it is on you fusing unit of your copier, check the fuse maybe it is open already and need for replacement... H4 means that your heater lamp is not functioning
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