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By Pro-Logic Technologies
Audio equipment generates heat in normal operation, and the ability to manage that heat effectively is a major factor in both audio performance and long-term reliability. When a system overheats — shutting down unexpectedly, running uncomfortably hot to the touch, or triggering repeated thermal protection events — it is a symptom that demands prompt attention. Sustained overheating is the leading cause of premature failure in power amplifiers and AV receivers, and ignoring the warning signs will ultimately result in far more costly repairs than addressing the root cause early. Pro-Logic Technologies provides expert overheating diagnosis and repair services for audio equipment across Nairobi.
Why Audio Equipment Overheats
Inadequate ventilation is the most common cause of overheating. Amplifiers and receivers require clear space around and above them for hot air to rise away from the heatsinks. Equipment installed in a closed cabinet without ventilation, stacked too closely with other heat-generating devices, or placed against a wall that blocks the rear vents will overheat regardless of its design quality.
Dust accumulation on heatsinks and circuit boards dramatically reduces their ability to dissipate heat. In Nairobi's environment, dust ingress is significant, and equipment that has been in service for several years without cleaning will often have its heatsinks coated in a layer of dust that insulates them from the surrounding air.
Failed cooling fans — in AV receivers and high-powered amplifiers that use internal fans for cooling, a failed fan will cause rapid overheating under load. Fans can fail due to bearing wear, dust clogging, or electrical failure of the fan motor. We replace failed fans with appropriately rated equivalents.
Drifted bias current — in amplifiers using Class A/B or Class A output stages, the output transistors are biased to conduct a small quiescent current even with no signal present. This bias current is set precisely at the factory to optimise the balance between thermal efficiency and crossover distortion. Over time, as transistors age and the bias-setting components drift in value, the quiescent current can increase substantially — increasing the heat generated by the output stage and eventually causing overheating. Re-biasing to the correct specification resolves this fault.
Partially shorted output stage — a partially failed output transistor may not be catastrophically short-circuited, but may be conducting more current than intended, increasing heat generation. This condition will eventually progress to full failure if not addressed.
Inadequate mains supply — in some cases, equipment overheating is caused by the mains supply being outside the equipment's specified operating range, causing the power supply to work harder and generate more heat. Pro-Logic Technologies checks mains supply quality as part of overheating diagnosis.
Our Repair Process
Overheating diagnosis begins with a thorough cleaning of the equipment, removing all accumulated dust from heatsinks, boards, and ventilation paths. We then operate the equipment under load while monitoring temperatures using a non-contact infrared thermometer, identifying the hottest components and comparing readings with known good specifications. Fan operation is tested. Bias current is measured and, where drifted, adjusted to the correct value. Output transistors are tested for correct electrical characteristics.
Where the cause of overheating is found to be a failed or failing component rather than maintenance-related, we carry out the necessary repair before returning the equipment. Contact Pro-Logic Technologies today for overheating system repair in Nairobi.