[ICOM] Bad TX audio on 775

[Art]

OK, no spec sheet found. But I did learn quite a bit about the chip.

Mitsubishi limits its distribution to Asian vendors, which is why I 
can't find it listed for sale in other market areas.

There are many many many of these available in China and Japan, quite 
literally by the thousands.

The spec sheet is probably available on the Japanese Mitsubishi 
website, in the Japanese language of course.

A Japanese native who speaks and reads the language can probably 
locate a sheet in short order, but I don't think I can locate one as 
I am not fluent in Japanese.

Many interent references lead to the MFC5282 by Freescale 
Semiconductor. This is NOT the same chip, don't waste your time 
tracking down this chip as you will be wasting your time.

GL.

Art




At 10:51 AM 10/14/2006, you wrote:
>No spec sheet found, but they are widely available in buk..........
>
>American Microsemiconductor has them in stock, less than 3 dollars each.
>
>See
>
>http://store.americanmicrosemiconductor.com/m5282fp.html
>
>Since this is an electronic attenuator, I would strongly suggest 
>confirming the audio input to the device is good before changing it.
>
>Still looking for data sheet::>
>
>
>Art
>
>At 10:38 AM 10/14/2006, you wrote:
>>It's a Mitsubishi electronic volume control, zero to 82 BD attenuation.
>>
>>Working on a spec sheet, stay tuned.
>>
>>Art
>>
>>At 06:01 AM 10/14/2006, you wrote:
>>
>>>Posting this for a friend:
>>>His 775 got some distorted audio on TX. Careful tracing led  him to suspect
>>>IC8 M5282FP audio amp.
>>>Service manual says pin 2 of the IC should be at 3.8V while in practice it
>>>is only 2.6V.
>>>Does anybody know where  I can get data sheet on the IC?  Where one can get
>>>this IC from? Do you thing it is the IC or  rather some parts (resistors,
>>>capacitors) associated with this IC?
>>>Any help would be appreciated.
>>>
>>>73, Igor UA9CDC
>>>
>>>----
>>>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>>Icom FAQ: http://www.qsl.net/icom/
>>>
>>>
>>>--
>>>No virus found in this incoming message.
>>>Checked by AVG Free Edition.
>>>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006
>>>
>>>
>>>
>>>
>>>--
>>>No virus found in this incoming message.
>>>Checked by AVG Free Edition.
>>>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006
>>
>>
>>--
>>No virus found in this outgoing message.
>>Checked by AVG Free Edition.
>>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006
>>
>>
>>----
>>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>>
>>
>>--
>>No virus found in this incoming message.
>>Checked by AVG Free Edition.
>>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006
>
>
>--
>No virus found in this outgoing message.
>Checked by AVG Free Edition.
>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.408 / Virus Database: 268.13.3/474 - Release Date: 10/13/2006