Question about Icom M302 VHF Radio

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Handheld Marine Radio

Model ICOM IC-M32 that is 4 plus years old. It will not power on even if in the charger. Do you think it is the battery? It has never been replaced.

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This applies to all battery powered radios. Take out the battery and measure the voltage to see if it is indeed charged. If it's not, then the fault is the charger or the battery or both. If the battery voltage shows that it is fully charged, then clean the terminals on the battery and on the radio with a pencil eraser to remove any corrosion. If still no joy, then look up in your user's manual on how to do a reset. If you don't have a manual, get on the ICOM website and download one.

Good luck.

Posted on Nov 16, 2008

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Quick description as per ICOM Manuals:
Quote
The AF amplifier circuit amplifies the detected signals to drive a speaker. The AF circuit includes an AF mute circuit for the squelch. AF signals from IC1 (pin 9) are applied to the de-emphasis circuit (R61, C89). The de-emphasis circuit is an integrated circuit with frequency characteristic of –6 dB/octave. The integrated signals pass through the high-pass filter (Q5, R62–R67, C90, C91) to suppress unwanted lower noise signals. The filtered signals are applied to the AF mute circuit (IC7B), and then passes through the [VOLUME] control (VR board; R1) via the “VOL1” signal. The signals are applied to the AF power amplifier (IC6, pin 1). The output signal from IC6 (pin4) drives the internal (external) speaker.
Unquote
I thus assume the IC you are looking for is the IC described as IC 6.
Data sheet availible online: http://www.datasheetcatalog.org/datasheet/sanyo/ds_pdf_e/LA4425A.pdf
The IC is a Sanyo LA4425A. A 5W Power amplifier.

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1 Answer

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