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 Post subject: Bose AWR1 clock radio not working
PostPosted: Feb Sat 22, 2020 1:43 am 
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Joined: Jun Sat 27, 2015 11:38 pm
Posts: 100
Location: Bear, Delaware 19701
I recently bought a Bose AWR1-1R clock radio dirt cheap because it's not working. Everything works but the radio. When the radio is turned on it makes an i itinitial loud hum and then fades all the way to inaudible. Should I assume this is the electrolytic caps or is it something else? I am not familiar with solid state radios. Thanks


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Sat 22, 2020 6:26 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 12054
Location: Mountains of Mourne. Ireland.
I've never heard of suffix 1R?
https://www.diyaudio.com/forums/solid-s ... ost3785825

Greg.


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Mon 24, 2020 4:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 874
Location: dayton oh usa
time to replace every electrolytic in it.
and there is a transistor that fails causing loss of +5.
seeing it was marginal i removed its associated parts and tacked in a 7805.
many of these sets are going to be covered in capacitor juice and need lots of cleaning and some corrosion repairs.


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Tue 25, 2020 4:50 pm 
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Joined: Nov Fri 30, 2007 5:20 am
Posts: 190
Location: lake geneva, wi
This radio is always powered. Pressing the off button mutes the audio. No surprise that the electrolytics dry out after 10 years. Some versions dry out faster because the capacitor maker made a mistake with the electrolyte formula. Just replace all the 'lytics.


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Tue 25, 2020 9:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 20964
Location: Utica, NY 13502 (USA)
You might be interested in reading this post:

viewtopic.php?f=6&t=373097

Dave


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Wed 26, 2020 9:19 pm 
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Joined: Sep Wed 10, 2014 7:13 pm
Posts: 950
Location: Urbana, Illinois
kc8adu wrote:
time to replace every electrolytic in it.

and there is a transistor that fails causing loss of +5.
The transistor with the high failure rate is not present in the original "Series I" version of the Bose Wave radio.

However, this "high failure rate" transistor is present in "Series II" and is labeled Q401 (2SC4695). The symptom of a failed Q401 is that the 5V power supply rail will be at 0V.

Guide for identifying the "Series" version:
    Series I: external AM loop antenna connected to radio with 3.5mm mono phone jack. 3x AA alarm clock backup batteries
    Series II: internal ferrite rod AM antenna. 3x AA alarm clock backup batteries
    Series III: internal ferrite rod AM antenna. 9V alarm clock backup battery.

Schematics for all "series" versions are available from here:

http://www.eserviceinfo.com/index.php?what=search2&searchstring=bose+wave+radio

-EB

_________________
I’m learning to be a leading-edge designer of trailing-edge technology.


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 Post subject: Re: Bose AWR1 clock radio not working
PostPosted: Feb Thu 27, 2020 5:06 pm 
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Joined: Jun Sat 27, 2015 11:38 pm
Posts: 100
Location: Bear, Delaware 19701
Thank you everyone. I will get right to it and repost the results later.


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