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Amateur Division
AM-081904-EU11
HM56/56A
Electrolytic Capacitor replacement
A common 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 is not a guarantee,
simply a common failure point and reference for repair.
The 5 capacitors on the board are labeled as C3, C4, 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
C3, 22mf 16v
(4510004430)
C7, 0.1mf 50v
(4510005950)
C3, 22mf 16v
(4510004430)
C14, 1mf 50v
(4510004440)
C13, 1mf 50v
(4510004440)
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