If you are looking for a manual to learn how to operate the radio (how to set frequencies, use the touchscreen, or configure D-STAR), this is not the document you want. You need the Operating Manual (Owner's Manual).
Understanding the IC-705 requires a look at its internal SDR (Software Defined Radio) structure, as detailed in the technical documentation: icom ic705 service manual full
Configuration: The community has found that while official docs may suggest 8.2 kΩ, a more reliable connection often requires: An 8.2 kΩ and 2 kΩ resistor in series. OR a single 65 kΩ resistor. The Verdict: Essential for the Advanced User, Useless
Why are hordes of operators searching for the Icom IC-705 service manual full right now? Three common failures: Icom Service Centers: The primary authorized source