code 548 on Ricoh 1027

[Aerohead]

I am getting a code 548 on my ricoh 1027, I don't think the two thermistors are bad, but could that be the problem??? Please don't laugh, I'm new at this.

Also,, I need to know how to reset it if I do have to replace the two thermistors. Thanks a Million.

[Kopyrtek]

The SC 548 means the machine doesnt recognize the fuser is installed.A bad connection between the machine and fuser unit.

[claudioterrible]

sc 548

The SC 548 means the machine doesnt recognize the fuser is installed.A bad connection between the machine and fuser unit.

you must reset with sp 5-810

[TonerMunkeh]

Everyone has to start somewhere fella!

Check the thermostats for continuity too.

[Aerohead]

ok

I checked the four (4) thermofuses individually and they are fine. The two thermisters do not have continuity through them. I thought they were just heat sensors to turn the lamps off and on, but there is no continuity through them. Does that mean they are bad. I just had a hard time believing they would both go bad at once. Ken

[iMind]

I checked the four (4) thermofuses individually and they are fine. The two thermisters do not have continuity through them. I thought they were just heat sensors to turn the lamps off and on, but there is no continuity through them. Does that mean they are bad. I just had a hard time believing they would both go bad at once. Ken

there is a way of checking them, heat up a lighter for a while not to much and make contact with the thermistor on the edge of the lighter then put your multimeter at 200 ohms, you should get a reading.

[graybeard]

On a thermistor the resistance decreases as the temperature increases. Cold it will most likely read as open or a very high resistance. If you're sure of your connection between the fuser and the machine you may be facing the dreaded "bad board". I'd also check the routing of the thermistor wires as a pinch could throw you a code.