I needed a new drum (j2 error) so I bought one, installed it correctly, but the machine still shows the j2 error and will not clear itself or let me make copies. What can I do? I really need it to be working soon.

1. turn off XD125f
2. Turn on
3. within 4 seconds press, clear, auto, clear, auto. LED Should go blank,
if not try again
4. use copy quantity keys to enter 24, then push start
5. Again use copy quantity keys to enter 7, then push start
6. turn off
when you restart the cartridge count will be set to zero

I have done this twice and never replaced the drum cartridge.

No. The CRUM is integral to the Drum Cartridge. The only way would be to swap CRUM from a cartridge that failed for a reason other that it reached end of life.

http://www.fixya.com/support/t147826_xd103f_copier_keeps_showing_j2_error

Hello sir; After replaced drum need to reset the counter,the procedure as follow;
1, press "clear", "Exposure","clear" "exposure" keys.
2, enter 24, press print key.
it should remove J2.

With "J2" flashing, press:
1. "CLEAR" button
2. "AUTO" button, then again
3. "CLEAR" button
4. "AUTO" button

Do it fairly quickly. If it's done quickly enough the display goes off. When it does:
5. enter "2" and "4" (see "24" on display)
6. Press "START/COPY"
7. Press "7"
8. Press "START/COPY"
DONE

If display doesn't go off repeat steps 1 to 4 but faster, until display is off.

With that machine, what frequently happens is the flag in the drum unit falls down during shipping and does not swipe the drum replacement switch.
You can do one of 2 things, Exchange the drum cartridge or, on the front of the cartridge you have to remove the green cover, Remove the clip and pop off the gear cluster. Then look at the one gear in particular that has a flag like protrusion. Rotate it so that it stops up and to the right, so that when you place the drum back into the machine it can rotate down and hit the switch that tells the machine you replaced the drum.
That flag only runs a half turn, one time at install. And if it has fallen in shipping hte J2 will not clear.
That is what has happened. It is pretty common.

J2 is the indication that the Drum Cartridge life has elapsed. The possibly exists that the Customer has installed a New Drum Cartridge. The Customer would be directed to change their Drum Cartridge by their User Guide. This action on the part of the Customer will cause the Drum Reset Switch to actuate for a moment when the Side Door is closed. This is with the provision that the Drum Reset Circuit is working properly. That momentary actuation of the Drum Reset Switch, being actuated by the New Drum, resets the Drum Counter. Should something be faulty with either the reset mechanism on the New Drum Cartridge, or the Drum Cartridge reset Switch circuit, the Counter will not reset. Note: A new Drum Cartridge will NOT reset the Drum Counter unless the machine is holding a J2 presenton the display. The first revolution of the Drum will render the Drum Cartridge used. A Used Drum Cartridge will NOT be capable of resetting a J2. Again, one revolution of a new Drum Cartridge will render it to be a used Drum . Cause:

J2 means the life of the drum has expired.
If replacing the drum does not fix it let me know.
J2 means the drum has met it's 18,000 page life.

J2 means your drum needs to be replaced. The life of the drum is expired.

check for a paper jam in the machine and in the paper tray, if no paper is found take out toner cartridge shake it slightly and reinstall. Also turn machine off & unplug. Let me know if you need more help.