A: Open the service manual to the Power Supply section. Check the +5V, +9V, +13.8V, and -30V rails. Then, perform the PLL unlock test. If it passes, replace the three known-problem capacitors (C1009, C1010, C1049) preemptively.
If you own a Yaesu FT-890, you are the caretaker of a piece of radio history. This rig was built to last 50 years with proper maintenance. However, time is the enemy of electrolytic capacitors and crystal oscillators. yaesu ft-890 service manual
: Detailed 2D diagrams of every double-sided PCB, typically categorized by side ("leaded" for through-hole components or "chip-only" for SMD). Schematics & Wiring A: Open the service manual to the Power Supply section
If you own an FT-890, you will likely encounter one of the following age and -30V rails. Then