Author: Steve (gate2-sandiego.nmci.navy.mil)
Date: 03-10-2006 18:24
Ok, first of all, the Analog board,(The one on the bottom that has the "little green potentiometer box" is the one that controls the motor speed, but you said you replaced it...
Then you replaced the PS.... no change...
Then you replaced the whole drive mech.. but that did not change anything......
The Data separator board has nothing to do with the drive motor speed...
What's left....
Well Dr. Spock said "Whenever you eliminate the Impossible, whatever is left no mater how improbable, must be the truth...."
If you have swapped out:
a) the Analog board.
b) the whole drive mech...
c) and the PS
well it has to be the "side board",,
OR...
Has the case become warped and something is touching/rubbing against the weighted inertia/flywheel on the bottom of the drive mech?
Maybe the side board is malfunctioning somehow causing the speed to wobble, maybe ALL the electronics are just too old as a whole.
When older electronics like this begin to decay, the "properties" of the components like the resistors etc. "their values" begin to drift, taking the circuit out of balance.
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