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Sony ST-S555ES  Secondary / Distortion Slug cracked
Sony ST-S555ES  Secondary / Distortion Slug cracked
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Old 15th October 2021, 11:43 PM   #21
tl01magic is offline tl01magic  Canada
diyAudio Member
Join Date: Dec 2020
So did the task today, sacrificed the Teac T-X100 for the slug.

What a tricky task to remove the broken one in the 555.

however managed without damaging the plastic threads in the IF transformer itself.

the replacement from the T-X100 seemed exact and threads in nicely.

Turned it on to test and the display was wonky so immediately turned it off for inspection and saw nothing.

the push, wiggle 'n feel for odd heat test found the weak point and revealed the unit has been worked on and a fair bit I think.

it was a bank of resistors that were causing the display issues, imaged below is from the 444 but that is what the resistor bank looks like.

With magnification it was clear it was once a glued area that was picked clean.

Click the image to open in full size.

imaged below is from the 555 / actual underside of the weak connection resistor bank. So just reflow and it worked / display is back to how it was.
The traces were scrapped almost to the next connection with a solder run on most. I only reflowed and added a bit more solder run to the next connection. I figure it was good, but shipping spoiled the fix that was done. so my handling of it finished it. So yay just simple reflow to fix.

Click the image to open in full size.

It's back in daily use spot though needs adjustments / low end is distorted sounding. I don't have equipment (just cheap stuff, and no fm stuff) or good ears so not sure if its the primary / secondary adjustments out of wack or not. that said I most often have talk radio playing, except when listening

Last edited by tl01magic; 15th October 2021 at 11:47 PM.
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Old 18th October 2021, 07:06 AM   #22
MikePP is offline MikePP
diyAudio Member
Join Date: Jun 2019
Change the backup battery
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