Hiya, Ive just replaced the heat and pressure rollers in a 7020 copier, (used to work in the industry and lost my manual/notes) its coming up with 34-1 which I thought was go into 25mode reset bit 3-1 to off, now its coming up with f34-1 and f34-4 Ive rechecked the thermistor there was a tweak to ensure the left hand one wasnt rubbing onthe new roller, and the right pair of sensors look clean but now its not going away, would that suggest the left one is faulty? Havent replaced the right pair yet although I do have a set. Any ideas?
If your pair of thermistors has white wiring instead of yellow (improved), replace the set with the latest part number, 26NA88013. The "left" one, is called a "thermostat", but is really a safety fuse. It should read dead short.
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This 51-4 code is directly related to the write unit. It can either be a bad lazer index control board mounted externally to the side of the write unit or a bad M5 polygon motor. It is better to replace the whole write unit. Konica P# 26WA-6500. On a side note, the 7020 write unit can be used in place of the 7022 write unit & is far less prone to failure then the 7022 write unit! 7020 write unit Konica P# 26NA-6500.
It depends on where it is jammng, if it is in the feed area change paper or clean the feed rollers above the paper tray. If it is crunching the paper look to see what is stopping it and correct it. If it still jams in the machine you need a tech to see why.