SOURCE: OKI C5500 Fatal Error 177
From OKI error log:
Lower heater temp state - Low
backup roller thermistor indicates low temp
seek service if turning off/on printer does not solve problem
SOURCE: oki 5800 shows 177 fatal error
A 177 is a fuser code. The fuser is the part that gets hot. Try rebooting the printer. Try taking it out and putting it back in (with the machine off). You might need to replace the fuser unit.
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