EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: tecman on March 20, 2021, 06:40:46 pm
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My 2723B spectrum analyzer has a CFL on the display that is on it's last legs. I purchased a couple of LED replacement kits. The new drivers are simple, easy to understand (V+, GND. Enable and Dim). However the 2723 has an Anritsu CFL driver with an 8 pin interface. Searching for any details or schematics cam up empty. I tried to ring out the existing board, but beyond basic connections I did not get too far. I tried to find a way to operate it in the unit, but the placement and the way the 2723 is assembled makes it near impossible.
Does anyone have any insight as to the interface on the Anritsu driver ? I was able to ring out a few pins while powered up and several have voltages on them.
Any assistance is greatly appreciated.
Paul
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If you mean that it has one of those little tiny-diameter cold cathode florescent lamps (CCFL), you could probably just replace the tube(s).
Places like Digikey stock them in a bunch of sizes... I've replaced tons of them on touchscreen POS terminal displays. There were some SHARP display panels in particular in the pre-Eclipse Micros UWS days that the tubes only lasted about 3-4 years at most at a time before you'd need to replace them, I guess the stock inverter was overdriving them? Both sizes of the active matrix panels were bad for that, while the earlier passive models lasted much, much longer (but still not indefinitely.) The ones for those terminals were about $7 ea.
I still have a stash of those bulbs around here somewhere....
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My 2723B spectrum analyzer has a CFL on the display that is on it's last legs. I purchased a couple of LED replacement kits. The new drivers are simple, easy to understand (V+, GND. Enable and Dim). However the 2723 has an Anritsu CFL driver with an 8 pin interface. Searching for any details or schematics cam up empty. I tried to ring out the existing board, but beyond basic connections I did not get too far. I tried to find a way to operate it in the unit, but the placement and the way the 2723 is assembled makes it near impossible.
Just figure out the power connections and connect enable and dim to the power supply using 10k resistors. That way the backlight is simply always on. Oh, and if you cut the LEDs strips to length, you might want to change the current sensing resistor on the LED replacement kit otherwise it will push way too much current into the LEDs.