Kenwood Power Supply Transformer / SMPS Noise

Unit emits a buzzing or humming noise from the control area even when not actively heating.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose transformer laminations, Aging electrolytic capacitors, Poor PCB mounting causing vibration, Mains frequency hum

Safety: Unplug before opening the control area.

Confirm source: With the cover removed (and only if you are qualified to work around live circuits), carefully localize the noise to the transformer or SMPS area.
Secure components: Tighten PCB mounting screws and add insulating pads if the board is vibrating against the housing.
Component replacement: If the transformer or capacitors are the source and the noise is excessive, replace the main PCB.
Usage: Mild hum can be normal, but loud or changing noises indicate a developing fault.

Hard 4/5

Main Control PCB

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