GFA-585 LE ADVICE! - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th January 2012, 09:05 PM   #11
diyAudio Member
 
Join Date: May 2010
Location: Florida
The board is pressed fiberglass and yes traces of the fluid will seap into the board at some point. You will not see bluging in these cap like the bad caps in computer mb's. Some times the board wil have to be cleaned down to the copper traces. After the board is compleated get some conofrmal coaating from Mouser, like 30+ a can do not use clear spray paint, it's not the same. Just make sure when you order the caps from mouser you look at the size of the caps to make sure they will fit. The only adjustments are the BIAS and unless your friend has done a lot of 565's it can easly be done wrong. Even the manual leaves out step's on this adjustment. The unit also should be qualified by distorshion test SIAND and DIST using a HP8903A and scope or equiv. There is no way I could advice you on parts replacement other then the lytic's without testing the unit myself. Goodluck.

Ed
  Reply With Quote
Old 1st March 2012, 05:55 AM   #12
diyAudio Member
 
Join Date: Nov 2009
Location: Helena, MT
Before cleaning, remove the bias pots and metal brackets. I use Simple Green cleaner diluted about 1 part to 10 parts RO water. Let the boards soak in a plastic tray for about 15 minutes and scrub with a soft nylon acid brush. Rinse well and repeat; the board has to be totally free of electrolyte contamination and it may take several cleaning cycles. I use a hair dryer on low to dry the boards and then let them air dry for at least a day. The capacitor electrolyte is colorless and very difficult to see without a magnifying lamp. The three 220uF electrolytics (per board) are the problem and the leaky cap issue applies to the GFA-585 and the GFA-565 monoblocks. Be sure to remove the DC servo IC and clean the chip itself, especially underneath and between the pins. While you are at it, replace the two 100uF bypass capacitors.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Speakers for Adcom GFA 585? Ed Holland Solid State 104 4th December 2013 11:55 PM
ADCOM GFA-585 LE amadork9 Solid State 1 18th January 2011 03:09 PM
GFA-585 Repairs Teeboyd Solid State 0 14th March 2010 06:36 AM
Adcom GFA-585 HELP NEEDED! georgehifi Solid State 19 18th October 2003 02:33 PM


New To Site? Need Help?

All times are GMT. The time now is 05:34 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2