intanto gli amici Americani cercano in tutti i modi di aiutarmi
ecco un' altra INTERESSANTE risposta :
Fausto,
there's a "MOD" circuit on the horizontal deflection module. This circuit supplies the operating voltage for the deflection output circuit. That voltage varies depending on the scan rate that is selected by the main processor. So there's two things that's happening with the deflection module once a scan frequency is seen on the BNC's:
1, The processor determines if it's a low band (below 60khz) or high band (above 60Khz) signal.
2, There are more precise voltages that are needed to operate the deflection drive circuits once the correct band is selected, so the main processor thru the deflection processor board (small board on the processor module) and the there's also a daughter card on the deflection module that will determine that exact voltage that will be precisely set by the "MOD" circuit on the deflection processor module.
So there are four modules involved here. And there must be good communication between all four of these boards, in order for this process to work properly.
The first thing to do would be to remove the two small cards from both the deflection module and the processor module. Clean the contacts and reinstall. That usually corrects this problem. If the problem still exist beyond this, you would more likely have a deflection module problem, but the problem could also be on one of the small daughter cards. Rule out the main processor, it let you know it's functioning when the "H fail" indicator came on.
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Mike Parker
Wisdom Technologies
FORTI sti Americani.
