if the screen is dimly lit then its a psu problem
the power to light the fip comes from a - voltage system of ac from the
transformer the rom chips hold tthe routines for switching the fip on via the 2
fip processors 1 for rom the other for column
the fip column controller has multi inputs which
are programed to switch on functions of the fip based on the cumminication
provided for each input these are the led switches on the front panel when
pressing 1 it will set a cummincation routinre which brings up a specific
message on the fip
now the screen board has 2 5v supplies 1 digital
the other is for the wheel and floppy drive check the digital opamp 5 v circuit
from the psu to make shure that you are getting the 5vdc
give your psu a overhaul new caps 105oc grade of
the same capacitance and same voltage if you cant get the same voltage then get
the nearest high voltage say if its a 4700mf 16v and you cant get 1 then up
grade to a 4700mf 35v this is exeptable as long as the voltage is not lower than
specified
----- Original Message -----From: Lee_Michael_ASent: Monday, April 26, 2010 2:54 PMSubject: [Ensoniq-VFX-SD] VFX-SD power on problemHi,
I left my unit on for about three weeks and came back to it to find that the display is only dimly lit on the left side (no chars...) and no sound. Has anyone had issues like this and repaired them? The fuse is okay.
Michael
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