Hi all,
I'm looking to beg, borrow, or buy the left and right extender
boards for a Cushman CE-50A-TG service monitor.
The one I have has an intermittant PLL unlock problem when tuning the 1
mhz digit upward past the 6-7 mhz position. It only happens when tuning
upward, and only on the 1 mhz digit.
One other symptom I have noticed is, the scope shows a large sine
wave when in generate before the unit has warmed up for 10-15 minutes.
If the "frequency zero" control is adjusted way off of center, the sine
wave disapears. As the unit warms up the sine wave slowly reduces in
aplitude until gone. Other than the 1 mhz digit the unit works fine.
After reading the theory of operation it seems the basic PLL should be
the culprit since it controls the 1 mhz digit and probably needs to be
re-alligned.
If anyone has ran into this problem before, or has the extender boards,
I would appreciate any help.

Thanks,
RoD


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