Manual Section: Error Codes Table (Appendix A) Solution: “Er” generally indicates an EEPROM checksum failure. The solution is a full memory reset: hold SCAN and MEM while powering on. The manual warns this will erase all programmed channels.
This is gold for marine electronics technicians. The service manual includes: jrc nct-196n manual
First, check https://www.jrc.co.jp/english/. Navigate to “Support” > “Marine Products” > “Legacy Products.” JRC maintains a repository for discontinued models. Search for “NCT-196N” – you may find a downloadable PDF, though registration is sometimes required. Manual Section: Error Codes Table (Appendix A) Solution: