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HM-56 Capacitor Replacement - Technical Bulletin | Radioaficion Ham Radio

HM-56 Capacitor Replacement - Technical Bulletin

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HM-56 Capacitor Replacement -Technical Bulletin AM-081904-EU11
HM-56A
HM56
HM 56

HM56/56A

Electrolytic Capacitor replacement

An age-related failure of the HM56/56A microphone, causing the radio to remain in TX mode when the mic is connected, is failure of the electrolytic capacitors on the microphone circuit board. Generally, replacing all 5 capacitors on the board repairs the problem and allows the microphone to work properly again. This repair does not guarantee performance.

The 5 capacitors on the board are labeled as C3, C5, C7, C13 and C14. They can be ordered from the Icom parts department using the following part numbers:

Icom America Tech support 8/19/04

HM-56 Capacitor Replacement - Technical Bulletin

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