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Developing unit problem, check the developer(black powder) if enough or sometimes is old full of paper dust. After replacement of developer perform calibration TDS . If p27 still appear replaced developing sensor( under it).
P27 Toner density sensor unplugged or toner density sensor problem. Conduct the condition of the sensor of the toner and presence of the toner in block of the manifestation, as well as presence of the perfected toner, clean the container with perfected by toner in block of the drum. Thank you.
The P 27 code is the change the toner.Please change the toner close the doors if the machine it turn OFF press and hold the 4&5 keys and turn ON the copier.Change using the ZOOM key 47,50,51,52 and press the START button the perform the toner setting.
P26 or P27 at power up or during copier operation.
1. Open connection from the TDS sensor to the main CB or lack of developer. The TDS output is abnormal (0.2V DC or lower).
Verify that the sensor output is above 0.2V DC by monitoring CN6-A9 on the main CB while running the main motor in diagnostics (47 mode, output code 40).
Repair any poor connections to the TDS sensor and supply developer if necessary.
2. Code occurs after resetting the PM counter and P26 occurs if machine is powered OFF/ON, because the L-detect (TDS) adjustment was not performed
P27 is a TDS sensor error. You need to check the connectors on you developer unit. Open front cover, push down on copier then lift green handle. remove screw just above toner suppy unit and remove your drum assembly. Next remove your developer unit(two latches hold it in place). your TDS connector is located under your dv unit(you will have to remove the black cover). When finished reinstall drum assembly then turn on copier. If problems persist turn copier on while holding down 47 then press 40 then start.you should hear a motor running (let it run for 1 min.) If you don't try P40 or 01. Turn copier on then back on. If the problems persist I recommend a service tech. your DV or TDS sensor needs to be replaced.
this is a toner density failure code if the service company replaced the developer and did not run the density adjustment it will through this code or it could be an older firmware version you need at least level 16 or it could be a bad toner sensor i would recomend having them come back out to fix it
I have a feeling that this has something to do with software on the hard drive. Either the software needs to be restored on it or it could have crashed. A Konica/Minolta dealer in your area should be contacted to send a technician out to look at the situation.