Adcom gfa 565 problem - Page 2

gootee · 26th March 2012, 03:32 AM

I forget the details of the cleaning solution composition. I believe that is covered in the links.

stratus46 · 26th March 2012, 03:40 AM

Quote:

Originally Posted by Bablo

I have taken the board out completely and will immerse it in a sonic bath to clean.Any other suggestion and what liquid to use in the bath much appreciated.

The last place I worked at we washed 1978 PC boards from an Ampex VTR in the dishwasher using ElectroSol and then dried them in a commercial food dehydrator. The boards looked and operated like new.

All the capacitor acid I've run into is water soluble so the dishwasher should be good. You DEFINITELY have to get rid of the acid. Last week I had a nearly invisible acid track that shorted a regulated (7905) -5V supply to an unregulated +8 which of course went to +7.5, ruined some new caps and at least 2 linear ICs. The acid short measured 1.3 ohms.

G²

gootee · 26th March 2012, 04:29 AM

I would also pay special attention to the IC socket, and its PCB holes. I would probably remove it, suck all of the solder out of the holes that I could, clean thoroughly, then install a new socket.

You really should read the ENTIRE set of linked threads, though. There were also some people who had to remove some of the solder mask.

Bablo · 26th March 2012, 03:15 PM

Thank you gentlemen. I have a sonic jewellery cleaner.I am going to put dishwasher liquid and clean. I will tell you what happened, It will take me a day or so.

Mayank · 27th March 2012, 12:48 AM

Bablo:

Can you post close up pictures of "before" and "after"?

Thanks
Mayank

Bablo · 27th March 2012, 07:33 PM

What do I do to upload ? It wont let me

gootee · 28th March 2012, 01:41 AM

Click the GO ADVANCED button. Then, click the little down-arrow that is to the right of the "Paper Clip" icon. (The paper clip icon is to the right of the "smiley face" icon, in the top row.) A window will open. Click a "Browse" button. Etc.

eyoung · 28th March 2012, 02:33 AM

Just for grins go to Badcaps.com good reading...

E

stratus46 · 28th March 2012, 05:30 AM

Quote:

Originally Posted by eyoung

Just for grins go to Badcaps.com good reading...

E

A Metcal iron with an STTC-126 tip is excellent for clearing the plate through holes once the cap is removed. The tip partly fits INTO the hole and heats it better than stainless needles. Back out the soldering iron a small amount and use the solder sucker to vacuum it out. The temperature control is Mil Spec and will not overheat but will maintain the temp. I've not tried the new 80 Watt units but the old 40 Watt units are good for nearly everything.

G²

Bablo · 1st April 2012, 02:03 AM

Finally it works .I have to make final adjustments. Pictures taken after final cleaning in an ultra sonic jewellery bath with dishwasher soap.
Thank you Goatee and and all who who helped.
I feel good.

26th March 2012, 03:15 PM	#14
Bablo diyAudio Member Join Date: Mar 2012	adcom gfa 565 Thank you gentlemen. I have a sonic jewellery cleaner.I am going to put dishwasher liquid and clean. I will tell you what happened, It will take me a day or so.

28th March 2012, 02:33 AM	#18
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	Just for grins go to Badcaps.com good reading... E __________________ "Sometimes obstacles are put in our way to make us slow down so that we can enjoy the journey and appreciate the destination when we eventually get there"

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26th March 2012, 03:32 AM	#11
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	I forget the details of the cleaning solution composition. I believe that is covered in the links.

26th March 2012, 04:29 AM	#13
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	I would also pay special attention to the IC socket, and its PCB holes. I would probably remove it, suck all of the solder out of the holes that I could, clean thoroughly, then install a new socket. You really should read the ENTIRE set of linked threads, though. There were also some people who had to remove some of the solder mask.

27th March 2012, 12:48 AM	#15
Mayank diyAudio Member Join Date: Oct 2004 Location: Falls Church, VA	Bablo: Can you post close up pictures of "before" and "after"? Thanks Mayank

27th March 2012, 07:33 PM	#16
Bablo diyAudio Member Join Date: Mar 2012	What do I do to upload ? It wont let me

28th March 2012, 01:41 AM	#17
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	Click the GO ADVANCED button. Then, click the little down-arrow that is to the right of the "Paper Clip" icon. (The paper clip icon is to the right of the "smiley face" icon, in the top row.) A window will open. Click a "Browse" button. Etc.