Question about Icom IC-R71A Receiver

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I have a Icom R71A receiver where the display works perfectly but the radio doesn't have a signal and the only noise through the speaker is a power up or down surge. Is this going to be a major fix or an internal fuse?

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rjrod888
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SOURCE: If you where going to Buy one radio which one would you Buy?

I am a marine electronics technician with 28 years experience. I have also been a licensed amateur radio operator for the past 12 years. Based on my professional experience with both brands (Icom and Yaesu), I have to advise you to go with one of the Icom units. The Yaesu is a good radio, but Icom's customer support is far superior. I have had no problems dealing with their service department over the years, something I can't say about Yaesu.

Hope this helps.

Posted on May 02, 2009

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jeffreyclay
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SOURCE: ICOM IC-28H very low sound from radio even thought volume is max

I had a very similar problem on a hand held scanner. In my case the mylar speaker cone had separated from the voice coil. I found an exact replacement for under $4 at Allied Electronics.

Posted on Feb 16, 2010

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This is a marine radio and is subject to corrosion on the speaker jack and other connectors. You may also have a blown internal speaker. Try plugging in an external speaker and see if you have any noise coming through. If not, it may just be the jack, but the re is a possibility that the audio amplifier has burnt out.

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G'day,

You have an excellent radio my friend, and that means you require the best possible advice and info.

May I suggest you join yahoo group SPECIFIC to your radio Make/Model, the expert team there will need as much info as you can possibly can give so they can resolve your query, plus you can download manuals, diagrams and other great things for your radio.

I hope I have been of help to you.

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Hi Mike,

The manual for this radio (in Adobe .pdf format) is available for download directly from Icom America, free of charges.

Since the "AquaQuake" function works and you do hear static when the squelch is off, that is sufficient to let us know that the voice coil of the speaker is functional and should produce sounds with the right signal applied.

The first thing to determine is if you're close enough to another operating transmitter for the radio to receive a signal. One of the 10 weather channels the radio is capable of tuning should be close enough produce some intelligible audio from the speaker - assuming the squelch setting isn't set too high.

If a WX channel works, then you'll need to see if there's a VHF Marine band transmitter operating nearby. You might need to set another Marine band radio receiver up to verify that there is indeed a signal present on the particular Marine band channel that you're monitoring. A list of frequencies is published on pg 27 (of the manual linked above) in case you need to convert between channel and frequency to tune on a non-channelized radio.

Outside of that, there's little the end user can do without specialized test equipment, schematics and of course, training. Many shops will be happy to provide an estimate for repair when provided with a small bench diagnostic fee. This fee is usually applied towards an authorized repair by most reputable repair shops.

I hope this helps & good luck!

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Sound like a speaker problem, dosconnect the speaker and check it with a meter, it should read 8 ohm. Good luck.

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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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Longshorts.

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I think you can have problems with the speaker, if you see the signal display working when you reiceve the VCO is working. If you could check (I dont remeber if this radio has audio connectors) external speaker. If this radio has an audio conector, this conector switches the internal and external speaker and could be dirt and is not switching to the internal spk.

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