Regi In Sensor is not turned On after paper is fed from Duplex.
Датчик регистрации входа не включается после подачи бумаги из режима двусторонней печати.
Check the following:
Registration Transport and/or Duplex Transport failure due to Roll wear/deterioration
Registration Transport and/or Duplex Transport failure due to foreign substance in Paper Path
Pre Regi Roll for dirt/paper particles/wear/a poor rotation
Drive gears for wear/breakage
Drawer Connectors contact points for foreign objects/bent pins/burnout
Go the the LED (On PWBs) Status Information RAP. Replace PH Driver PWB ( PL 11.3), IOT Drive PWB ( PL 11.1) and the MCU PWB ( PL 11.1) one at a time in the order shown