So now it seems, that in the same time a have an error with the PS31 and the modification for C2152 error. The machine is new so almost no copies until now. What i have found is that the status of PS31 (transfer belt retraction sensor) doesn't change at all during initialization prozess. So i may have to do this modification firstly. The error C-255C comes always on the beginning and after a minute the machine has started. Image units where new at the time the techincian changed them but at that time the HV was broken and there was of course the problem with PS31 too.
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