Komatsu 7834‑24‑2001 is a control unit (controller/generator) used in PC150–PC200 series excavators, providing drive signals and monitoring for the machine’s hydraulic system. Common failure modes for this class of industrial controllers include input voltage sag or spikes, internal fuse blowouts, capacitor degradation on the power supply board, and damaged signal traces from vibration or corrosion. First‑check diagnostics: verify 24 V DC supply to the controller with a multimeter; inspect all fuses and replace any blown ones; visually examine the PCB for burnt components or loose solder joints; and review any stored error codes via the excavator’s diagnostic port before proceeding to component replacement.[oss-gpt-20b]