What is error code e 63 on topcon gpt 7000sln?

Error code E 63 on the Topcon GPT-7000SLN typically indicates a communication problem between the instrument and the controller or a malfunction in the internal circuitry. This could be due to issues such as a loose connection, faulty cables, or internal hardware failure. To resolve this issue, check all connections and cables, and if the problem persists, consider consulting the user manual or contacting Topcon support for further assistance.