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PostPosted: Sat Mar 17, 2018 5:58 pm 
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Joined: Fri Jul 04, 2014 8:37 pm
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Location: Toronto, ON, CA
Loved SONY brand since I was a kid...Walkman, Discman...but never had a SONY amp, so I volunteered for fixing a SONY ES amp. It enters into protection mode immediately after turned on....

I have done the fix 1 month ago, now just post this thread to share some info...

Well, first thing first, some cleanup need to be done... vacuumed, disassembled, cleaned....


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Last edited by Frank Wang on Sat Mar 17, 2018 7:41 pm, edited 1 time in total.
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PostPosted: Sat Mar 17, 2018 6:39 pm 
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Joined: Thu Aug 07, 2008 10:57 am
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Location: Montreal, QC, CA
I had several TA-N55ES and TA-N330ES amps, they were very nice and easy to work on.Of course the higher end TA-N80ES and TA-N77ES I had were nicer. I have had many ES components over the years, amps, pre's, DAT's, CDP's, cassette, tuners, ect, all had to have the rosewood sides though. :D

Did you locate the issue? Bad solder joints? STK pack blown?


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PostPosted: Sat Mar 17, 2018 7:03 pm 
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vincei wrote:
I had several TA-N55ES and TA-N330ES amps, they were very nice and easy to work on.Of course the higher end TA-N80ES and TA-N77ES I had were nicer. I have had many ES components over the years, amps, pre's, DAT's, CDP's, cassette, tuners, ect, all had to have the rosewood sides though. :D

Did you locate the issue? Bad solder joints? STK pack blown?


The STK is ok...bad solder joints killed some parts...


Attachments:
File comment: 2SA1215 blown off a piece
IMG_3344.jpg
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File comment: Caused by Q352 bad solder joint
IMG_3381.jpg
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File comment: Due to the bad solder joint killed Q352, and power transitory 2SA1215, plus some resistors...
IMG_3412.jpg
IMG_3412.jpg [ 203.62 KiB | Viewed 1220 times ]
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PostPosted: Sat Mar 17, 2018 7:31 pm 
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Location: Toronto, ON, CA
as time goes, solder joints could go bad for some machines...


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File comment: put disassembled parts and accessories into separated bags...
IMG_3355~1.jpg
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File comment: amp board redid soldering
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File comment: bad solder joints on speaker output board
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File comment: remove old solder joints, cleanup, and re-solder
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PostPosted: Sun Mar 18, 2018 4:34 am 
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Transistors:
-2SC3423 on the heatsink also blown, replaced with a new one.
-replaced driver transistors 2SC2775/2SA985 with MJE15034/35
-replaced 1215/2921 with 1216/2922

Bad resistors replaced...

Caps replaced...

Re-did solder joints...

Contacts(vol pot, input, output...) cleaned


Attachments:
File comment: contact cleaned...
IMG_3470.jpg
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File comment: replaced 2SC2775/2SA985 with MJE15034/35
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File comment: replaced 1215/2921 with 1216/2922
IMG_3823.jpg
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PostPosted: Sun Mar 18, 2018 5:02 am 
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done...problem resolved...and all shiny :)


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PostPosted: Sun Mar 18, 2018 5:18 am 
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Location: New Glasgow, NS, CA
Great work! I resurrected a Sony TA-F530ES about 10 yrs ago. I also copper shielded the interior chassis and beefed up the OEM power cord from 18ga. to 14ga. and everything in SQ was lifted. Turned out to be quite an amazing amp with lots of punch and bass....wish now that i had kept it!!


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PostPosted: Sun Mar 18, 2018 7:12 am 
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Great job. I had fun restoring mine as well! Cracked solder joints seem to be an issue with these Sony's. I had a TA-N77ES with cracked joints and also a receiver with bad solder joints and that could have taken out the STK module in it.

My previous ES stuff (no longer own)
https://www.flickr.com/photos/mastercon ... 1651786793


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PostPosted: Sun Mar 18, 2018 7:42 am 
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Cracked solder joints are among the most common failure points for most mass consumer 'high quality' audio gear.

It has to do with how the solder bath is run (time/temp vs cooling vs solder qualities)...vs how much thermal and electrical stress is on the solder and associated traces, vs any long term vibration and bending modes the particular solder junction may have to endure, over time.

Every time you open an item, look for solder junction failure/cracking/stressing as part of your visual inspection.

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PostPosted: Sun Mar 18, 2018 8:01 am 
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you can clearly see this amp as add extensive work done in the past. and I would not say that soldering was made by pros???


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PostPosted: Sun Mar 18, 2018 10:08 am 
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Fantastic workmanship.
Thank you for sharing this.

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Yes get what you want cuz you can get anything..."


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PostPosted: Tue Apr 17, 2018 6:04 am 
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zon001 wrote:
you can clearly see this amp as add extensive work done in the past. and I would not say that soldering was made by pros???


No, it's all original. Typical factory stuff, just old.


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