Before Replacing the PCU or Development Unit

Before replacing the PCU, set SP3-701-002 (Manual New Unit Set: PCU) to “1” and turn off the main power switch. After replacing the PCU, turn on the main power.
Before replacing the development unit, set SP3-701-023 (Manual New Unit Set: Development Unit) to "1" and turn off the main power switch. After replacing the development unit, turn on the main power.