Oki IP-6620 Maintenance Manual page 313

5.5.60 System Error 4XXX and 5XXX: Firmware Internal Error
<Description>
A firmware internal error occurred.
<Faulty part>
(1) Firmware
(2) PCB-ASSY-IPB5-100
<Action>
Check the Items to be Checked on the table below, and perform the actions starting from the top
until the problem is solved.
No
1 Firmware
2 PCB-ASSY-IPB5-100
5-154
Chapter 5 Troubleshooting (Engine Section and USB Controller Section)
Items to be Checked
OKI Data Infotech Corporation CONFIDENTIAL
Action
Upgrade the firmware to the latest version.
Replace the PCB-ASSY-IPB5-100.