Electronics > Repair

Fluke 289 not quite sorted.

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nixxon:
Suddenly the meter was beeping all the time no matter where the jacks were connected.

I cleaned some of the input areas, components Q24, Q27 and DS2 with Q-tips + IPA.

I also resoldered a corroded looking solder joint on the tiny DS2 diode between the current inputs.

Now the Current Terminal Sensing works as it should - Only beeping (4 times per second) when jack a jack is inserted in any current input and not corresponding selection on rotary selector.

Now I have to figure out why the LCD doesn't show any information.

coromonadalix:
Is the flexible pcb foil is well inserted in the white connector or have some physical damage ?   maybe pull it out and replug it ?

Terry01:
Nice! That's 1 less thing to be sorted out. You'll have it up and running properly before you know it my friend.  :-+

nixxon:
I measured oscillators/crystals  Y1 and Y2.
Y1 oscillates steadily at 32.764 kHz.
Y2 oscillates steadily at 32.766 kHz.

Y1 signal amplitude is however relatively low, only 200 mVpp (measured between ground [negative pad] and either oscillator terminals).
Y2 signal amplitude was easier to measure with an amplitude of 900 mVpp.

Does anyone know the right specs of Y1 and Y2?

nixxon:

--- Quote from: coromonadalix on October 14, 2018, 07:53:53 pm ---Is the flexible pcb foil is well inserted in the white connector or have some physical damage ?   maybe pull it out and replug it ?

--- End quote ---

I haven't noticed any PCB foil inside the meter. I will look for it and the white connector the next time I get some spare time to do more troubleshooting.

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