Question about Icom IC-R8500 Base Scanner

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Power inverter on ic-r8500

After my ic-r8500 made squacking sounds, it`s audio dimished and now it will not scan the highter frequencies. I read online that it could be a capacitor on the power inverter. would like your opinion and also where is the power inverter supply circuit located? would appreciate any info.

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  • Anonymous Aug 21, 2008




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Wow thats a great radio, pack it up and send it to me.(just kidding)you might want to contact icom and talk to their techs about this one. congratulations on having one fine radio, it is worth a quality repair,ive wanted to take one of those apart for years lol

Posted on Jan 02, 2009


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Posted on Jan 02, 2017


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1 Answer

ICOM RADIO IC-R8500 display blink freq and no audio signal


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.

Best regards,

Dec 12, 2012 | Icom IC-R8500 Receiver

2 Answers

NO audio signale

l would first check for audio from the external speaker connection which most have.

Dec 12, 2012 | Icom IC-R8500 Base Scanner

1 Answer

What is the frame output ic

Frame output IC means nothing, but the VERTICAL OUTPUT IC. Every TV will have it, which will scan picture vertically at 50 or 60 Hz. [1 HZ means one frame per second. Normally TVs will have 50Hz, 60Hz and 100Hz vertical frequency]. As vertical frequency rat increases, the picture fliker wil decrease. High level high-cost TVs will have 100Hz or even more frequency will be used for vetical scanning.
In the case of computer monitors, the vertical frequency will vary from 60Hz to 120hz. You can see its picture stability, at this high frequency.
The IC [Integrated Circuit Chip], which generates the vertical frequency and outputs it called the vertical output [frame output] IC. OK

Wish you a Proseperous and Happy 2012.
Gopakumar G, Trivandrum City, Kerala State, South India.

Dec 29, 2011 | Televison & Video

1 Answer

It just won't turn on, it won't show anything on the screen , it just makes a clicking sound when i press the power button.

The clicking sound is a bad power inverter. I have seen this several times. The power inverter aka power supply, power converter. If you can get a voltmeter then you can test it. See how much is going from the power inverter to the main circuit board. Another possible cause would be a faulty self-protection circuit that these have to keep from the system overloading it goes into protect mode when there is to much volume frequency.

Jan 28, 2011 | Sony STR-DG510 Receiver

1 Answer

The sound on our unit will flip off after a minute or so. Then, the sound becomes a low-bass reverberation. Any ideas on how to resolve this would be appreciated.

Possible that the Audio output IC is faulty as the set is changing the frequency after powering up.
But it will be important to open and do a audio signal test to confirm onthe fault of the IC.
If the signal to the IC is analysed then the fault is confirmed speccially if the audio output is clean when fed to an external amplifier.
If not the audio processing canbe faulty either inthe preamp or the SIF.

Sep 24, 2010 | Dell W3706MC 37 in. LCD HDTV

1 Answer

I need frequiences for local police departments for my scanner valdosta ga 31601

For a comprehensive database of active frequencies in your area, and a lot of other useful scanning information, visit:

Bill B

Apr 04, 2010 | Icom IC-R8500 Base Scanner

1 Answer

No sound, no supply B+

Check for either an open resistor in the B+ line that feeds the audio amp IC or remove the IC and check for B+. If the IC is shorted, the B+ reading will read low.

Mar 18, 2008 | Philips 27PT543S 27" TV

1 Answer

IC-R8500--Display is flashing continuously--no receive

First check the tape cables from Conv Unit and Rf unit to main unit.
Second find if the PLL ICs lock (MC145190) check voltage at pin 2 (LO) ~4,5Vdc in PLL Unit.
Third find If the (PQ30RV31) voltage ADJ in main works.

Nov 01, 2007 | Icom IC-R8500 Base Scanner

2 Answers

Audio problelms

Bad Solder Connections on The Main Board(Look for Ring Breaks)

Jun 10, 2007 | Icom IC-R8500 Base Scanner

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