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12-15-2010, 07:30 PM
when i press start paper jam under the drum unit it display error code F28 please help.

12-16-2010, 06:32 AM
Dear Friend,
If my memory is good, then it's some thing related to ATDC ( T/C ratio ) setting. Put a new developer, Perform L detection ( ie. in 47-51 mode & then 'Start' key). Sorry, before that perform a 47-90 also, so that counters will be cleared. Also, check for the contact between IU & M/c side & connectors.It's an 'old analog' loose contacts can happen due to constant pulling out/insertion of IU from the machine also.
I'm saying this from my memory only, as I stopped with these models at-least 5,6 years from now.
Entering a 47 mode is easy (hold keys 4 & 7 simultaneously,press POWER button & wait a while till HI, or Lo is displayed& then press 90 & Start key. similar for 47-51 also, but this time M/c will work for approx. 180sec( performing L detect).:)

12-16-2010, 02:36 PM
f28 - transfer/separation corona unit

abilasshvk , you are talking about p26 :)

12-16-2010, 10:20 PM
yea, check the corona unit, a wire will either be snapped or you might have to insulate the corona end blocks.

12-18-2010, 12:51 AM
....yes,you must change transfer corona ,or repair it..

12-18-2010, 06:35 AM
Sorry Friend,

You are right.I forgot the error codes as I stopped doing it.Anyway it's nice to hear that these machines are still running.


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