EDP noise help (unsoldering)

["phill wilson" <blackface@hotmail.co.uk>]

Hi all

right, ive gone and been a silly chimp,
I bought a second edp l( blackfaced echoplex)last month, but have been so 
so 
busy ive only just got to the pluggin in stage and.............. aaaarh 
noise!!!
hummming noisey noise....
the humming actually starts as soon as the mains cord is plugged in and is 
raised to crazy levels as soon as i power on.
the screen displays correctly  and all seems in order under the hood,and 
ive 
tried all the normal fixes. ive got another white face echoplex and have 
had 
a noise problem before, and last time i reseated the rams, roms and the 
lil 
square chips and that solved it.........went to do that this time and 
HORROR!!!!!! someones gone and put metal covers over the square 
chips......so questions
1.Any idead on the noise cause?
2. If its what i think it is how do i get those damn covers off?
3. Why cover the chips?

thanks for any and all input on this, i knowwe go round in circles on this 
subject and i thought i was ok solving my own probs, bt this has me really 
bummed out , ve not een used it yet

Phill Wilson

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