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I tend to believe the problem is on processor board.. after removing it (inspection under microscope sowed nothing) and putting it back it behaved strangely (never heard before buzzing from speaker) and it came back to it's senses after a prolonged time, I already thought I killed it)
When I fiddle with flat cable, I can photocopy only one page, but I can't print from comp.. ??
This looks like some input is floating due to broken track or wire.. and by manipulating the cable I charge a relevant control gate so something is enabled for a while (this is my theory).
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