jm
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I checked the manual on my protek 506 dvm & it
said that the test current for diode testing is 1 ma.? The diode in
question is acting as a switch which is controlled by a bias voltage based on
frequency which is controlled by a MUX24FQ 4 channel analog ic.? If the mux
has failed then the bias will not be correct.? When I meter the circuit in
question I get -.34 v. relative to ground which would keep the diode off.?
In any event I just tested the main osc. on the unit and it has stopped working
& I had it up & running last week after resoldering the osc. control
board.? Frustrating.
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Thanks
?
Richard
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