Kyocera ECOSYS M4125idn

3. No display in the operation panel

(Image on the operation panel is faulty or becomes pure white)

Step	Check description	Assumed cause	Measures
1	Resetting the main power	The main firmware does not start correctly.	Turn off the power switch and pull out the power plug. After passing 5s, reinsert the power plug and turn on the power switch.
2	Checking the connection	The connector is not connected properly. Or, the wire is faulty so that the power for display is not supplied.	Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. Main PWB - Operation panel main PWB Main PWB - Low-voltage PWB
3	Replacing the main PWB	The main PWB is faulty.	Replace the main PWB.
4	Checking the operation panel PWB	The operation panel main PWB is faulty.	Replace the panel main PWB.
5	Replacing the low voltage PWB	Low voltage power PWB is faulty and the power is not supplied to the main PWB.	Replace the low voltage PWB.

4. The operation panel remains displaying "WELCOME" and does not change

Communicate between the main PWB and the operation panel main PWB can't be done.

Step	Check description	Assumed cause	Measures
1	Resetting the main power	The communication between the main PWB and the operation panel main PWB is faulty.	Turn off the power switch and pull out the power plug. After passing 5s, reinsert the power plug and turn on the power switch.
2	Checking the connection	The connector is not connected properly. Or, the wire or the SATA cable is faulty.	Clean the following wire, the terminal of SATA cable connector and reconnect them. If there is no continuity, replace the wire. Main PWB - Operation panel main PWB
3	Executing U021	The backup RAM data is faulty.	Execute U021 to initialize the backup RAM data.
4	Replacing the main PWB	The main PWB is faulty.	Replace the main PWB.
5	Replacing the operation panel main PWB	The operation panel main PWB is faulty.	Replace the panel main PWB.

5. The login fails with other than the ID card

Step	Check description	Assumed cause	Measures
1	Changing the setting	[User/Job Account] is valid while the card authentication kit is not installed.	Set [Permit] at [User/Job Account] > [ID Card Settings] > [Key Login] via the System Menu.