Quote:
Originally Posted by 3pinplug
Added the two extra diodes but display still scrolling, made no diferernce to original fault as when fitted with original diode.
taken with probe set t0 X10
Pic 1
Amp / Div 50mv
Time / div 1us
Pic 2
Amp/div 50mv
Time / div 50us
Also put frequency counter on TP6 and measured 4.505mhz coarse min and 4.75 mhz coarse max figures are approx as digits still scrolling.
If there is an IC feeding the caps / diode should we consider changing that?
Regards
Mark
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Have you checked the voltage at FP1 and FP2?
FP1 Should be a variable voltage depending on setting of Fine and course tune knob. Should be a smooth linear transition from both knobs at minimum to both knobs at maximum. What is min and Max voltage?
FP2 should be a stable voltage for any setting of the fine and course knobs.