The SRG-1150DN includes an internal self-test feature that simplifies routine health checks. Technicians should use this to verify the integrity of the synthesizer and internal memory.
The SRG-1150 uses a 2SC1945 (or RD15HVF1 in later models) for the RF final stage. If you run the radio with a high SWR for too long, this blows. The manual shows the bias voltage settings (adjust VR4 for idle current at 150mA). samyung srg 1150 service manual 19