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The 77 error is caused by a fuser temperature sensor. The following steps can be used to possibly reset the Intellifax 4100 77 error.
1. Unplug machine then wait 15-20 minutes. 2. Hold down menu key. Plug in machine. 3. Release menu key at maintenance message. 4. press 91 then set button 5. press 99 then set button 6. Machine will warm up. 7. Press Reports key, then press 1. This will test if the machine can print.
If these steps do not reset the error the thermal fuse would have to be replaced by a repair technician.
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