SP C431dn SC312

[anothertech]

I have a SP C431dn down with an SC312. There are also SC313, SC314 and SC315 in the sc machine history. I have replaced all four PCDU's, the drum stay and the HVPS:CB. When I turn on the machine it starts to turn the drums, then codes. When I pull out the drums, the black drum is covered solid with black toner. Any ideas?

[slimslob]

All 4 of the service codes you mention have to do with HV detection for each of the four PCU. Also the K drum totally coated with toner indicates it did not get any charge. Since you say you have already replaced the HVPS:CB and all four PCDU, that leaves a connection or wire harness problem.

[copier tech]

I have a SP C431dn down with an SC312. There are also SC313, SC314 and SC315 in the sc machine history. I have replaced all four PCDU's, the drum stay and the HVPS:CB. When I turn on the machine it starts to turn the drums, then codes. When I pull out the drums, the black drum is covered solid with black toner. Any ideas?

Did you replace just the PCU? or PCDU?

Also check the transfer unit, pull it out does it turn OK by hand?

[anothertech]

All 4 of the service codes you mention have to do with HV detection for each of the four PCU. Also the K drum totally coated with toner indicates it did not get any charge. Since you say you have already replaced the HVPS:CB and all four PCDU, that leaves a connection or wire harness problem.

We are bringing the machine into the office tomorrow, I'll start looking at the harness.

Did you replace just the PCU? or PCDU?

Also check the transfer unit, pull it out does it turn OK by hand?

I replaced the PCDU's. I have not looked at the transfer unit, I''ll check it out.

[fshead]

i would check all contact points in the image process sections..
maybe not getting a good contact somewhere.