If the section contains a troubleshooting table, here are the common fault codes and solutions:
| Symptom | Probable Cause | Check/Action | | :--- | :--- | :--- | | No RX Audio (Hiss only) | Squelch gate or Audio IC | Check Audio IC (usually TDA1905 or similar) input pin. | | No TX / Low Power | PA Transistor or Relay | Check SWR of antenna. Measure voltage at PA Collector while keyed. | | Display Dark | LCD connection or Regulator | Check ribbon cable continuity. Check 5V regulator on main board. | | Keypad Not Responding | Membrane corrosion | Clean the carbon contacts on the PCB and the rubber keypad. | samyung srg 1150 service manual 19
If you successfully obtain a legitimate copy of Revision 19, here is what you can expect. If the section contains a troubleshooting table, here
1. The Final Transistor is Fragile 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). | | Display Dark | LCD connection or
2. Common Electrolytic Capacitor Failure If your unit is >10 years old, replace C112, C115, and C214 (10uF/25V) on the audio board. Leaking caps cause the “motorboating” sound on receive.
3. Channel Programming Unlike VHF radios, this 29MHz Korean band radio often requires a PC connection (via the DB9 port on the back) to reprogram marine channels. The service manual includes the serial protocol (9600 baud, 8N1) if you are building a DIY programmer.
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