F2-21 Errors

[redserv]

hello guys I have noticed that we are getting a lot off F2-21 Error Codes on MXB402N MFP's when we do PM's, We would normally change MX-C31U2 secondary transfer unit,Are we missing something? We get the error everytime we change a new MX-C31U2,hope someone got some info on this, thanks in advance.

[Akitu]

Re: F2-21 Errors

From the manual...

F2-21 Secondary transfer unit initial
detection trouble
Detail PCU
Cause When the newly installed secondary transfer unit is
driven for the specified time after installation, the
new state is not canceled.
PCU PWB trouble.
Connection trouble of the connector and the
harness.
Secondary transfer UN initial detection mechanism
trouble
Initial detection electrode trouble
Secondary transfer unit trouble.

Check & Remedy
Check conduction of the initial detection electrode
plate and the initial detection GND electrode plate.
Replace the PCU PWB.
Check connection of the connector and the
harness.
Replace the secondary transfer unit.
Error cancel method Power OFF - ON

I would inspect the area around the secondary transfer unit and make sure the plate is still there and not covered in toner etc., reseat all connections to the PCU PWB and if all else fails, look into replacing the PCU PWB.

[redserv]

Re: F2-21 Errors

thanks Akitu appreciate it,I will look into it.