Sony TA-FE230 Left Channel Weak - diyAudio
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Old 25th November 2012, 09:40 AM   #1
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Join Date: Nov 2012
Default Sony TA-FE230 Left Channel Weak

This seems like the best place on the net for this sort of thing, so here's my issue, fingers crossed someone can help

Basically, I've got a Sony TA-FE230 amp which is exhibiting a MAJOR loss of power in the left channel, primarily in the lower frequency range. The treble still seems to be of comparable power, but the bass is completely absent and the midrange seems to be lacking as well.

I've managed to get hold of the service manual, and here's the main section; the rest seems is just control surfaces and the PSU etc.

So the big question is, where would the fault likely be located, and which components would a replacement of give the best chance of success in getting it back to working order?

Fingers crossed one of you has some good advice :P
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Old 25th November 2012, 04:13 PM   #2
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C301, C313, C305. Also check CN811 because the tone controls of this amplifier are implemented in the feedback loop of the main power amp.

Might also be worth checking the relay
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Old 25th November 2012, 05:11 PM   #3
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Ty very much!

I more or less discounted the tone section as altering the bass/treble controls DOES affect the sound, adding a bit more bass and mid to the left, but still WAY less than the right channel. Due to this, I just assumed that the problem was in the driving stage rather than the tone. Could be wrong though, I suppose if changing the power amp caps doesn't help I know where to try next :P

Unfortunately my ability to test the caps is pretty much limited to the whole multimeter polarity jockeying; a pretty fail method I know, but I figure replacing a couple of small caps will still work out as far cheaper than buying a proper tester lol.
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Old 28th November 2012, 09:07 PM   #4
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No luck I'm afraid

Still WAY quieter on one channel, although the tone seems far more balanced now... anything else to check/replace?

I've uploaded the entire service manual here:
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Old 28th November 2012, 10:21 PM   #5
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What kind of skill set do you have? For example If I were to suggest using a controllable source such as an MP3 player to inject signal into various stages of the amp, would you be OK with doing that ?
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Old 28th November 2012, 11:10 PM   #6
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Theoretically, yes :P
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