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Author Topic: TS440S Low audio output into Speaker..  (Read 4122 times)
K6BF
Member

Posts: 9




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« on: February 04, 2013, 03:26:21 PM »

Greetings to all!!! Anyone has experience on this transceiver before a Kenwood TS440S that has a very low audio into speaker on any modes,But the headphone is normal loudness. I tried using couple of external speaker but still very low.Radio is working well on every aspect except the audio.
Thank you very much in advance...

k6bf@yahoo.com

de K6BF/BERN

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KA4POL
Member

Posts: 1969




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« Reply #1 on: February 04, 2013, 11:10:14 PM »

Well, the prime suspect would be the audio amplifier µPC2002. Check the voltage as usual in those cases.
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K6BF
Member

Posts: 9




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« Reply #2 on: April 16, 2013, 09:21:11 AM »

Fixed the problem shorted blocking cap on the IF board  C175.  Smiley Smiley
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KA4POL
Member

Posts: 1969




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« Reply #3 on: April 16, 2013, 09:55:53 PM »

Thanks for the feedback. This was certainly not easy to find. But it was close to the IC7 which I thought to be critical. Electrolytics are a real pain.
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KE3WD
Member

Posts: 5694




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« Reply #4 on: April 17, 2013, 08:21:19 AM »

...Electrolytics are a real pain.

Not really.  After all, you were able to effect a cure without having to resort to rather expensive test equipments, long troubleshooting sessions, recalibration following the manual in an effort to locate a section that might be misbehaving, signal tracing around feedback loops, investigating processor bootup routines, tracing DC voltage paths, etc. etc. etc. 

The electrolytic capacitor problems, by comparison, are actually fairly easy stuff to perform, even by the lesser-experienced. 

Congrats on a successful troubleshoot and repair! 


73
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