The large, multi-layer main digital board has only a simplified block diagram—no full schematic. If the RF chip (RSP1A clone) or STM32 main CPU fails, the manual offers little help beyond “replace the board.”

Deducting 2 points for the missing mainboard schematics and lack of troubleshooting flowcharts. However, for what it covers (RF board, PLL, filters, PA, power management), it is accurate, thorough, and a model example of a modern SDR-based service manual. If you own an IC-705 and plan to keep it for a decade, —even if you never open the case, it will help you diagnose whether a fault is user-resettable or requires a bench technician.

Are you troubleshooting a (e.g., no power, low TX power, or a blank screen)?

: Some community members have noted that the standard instructions for the "jig plug" required to enter service mode may need adjustment; while the manual may suggest an 8.2 kΩ resistor, some users found success only with different configurations, such as a 65 kΩ resistor.

Aligning the internal high-stability clock to ensure exact transmit and receive frequencies.

Now, the display lit up, the menus worked, but the radio heard nothing and spoke to no one. The RF deck was dead.