Hi all, because i have completely forgotten my username in this forum i had to register new..... sorry about that...
Owning four QM2000 boards i have a problem with one Board since longer time, but it get more and more worse.
Problem ist, that Output 3 (Intensity/Blanking) will not go to zero voltage, so a single-color laser will not go off. If you measure with an analog multimeter, you can see round about 1.7V, if all lines are off. You can also measure this voltage, if you only switch on the PC.
Now, some months further, the voltage has raised to 2.3V, so the laser is more or less on. Looking with an oscilloscope to the output shows, that he is working from this voltage to maxmum.
All other outputs are working fine, so it looks that something has happened to this one. My idea is now to change the output amplifier chip TL084. Does it make sense, or is there another known part ... i don´t have a circuit diagram - maybe it´s possible to get it partly from Pangolin - mybe it´s secret -@
Thanks & kind regards
Ludwig
Owning four QM2000 boards i have a problem with one Board since longer time, but it get more and more worse.
Problem ist, that Output 3 (Intensity/Blanking) will not go to zero voltage, so a single-color laser will not go off. If you measure with an analog multimeter, you can see round about 1.7V, if all lines are off. You can also measure this voltage, if you only switch on the PC.
Now, some months further, the voltage has raised to 2.3V, so the laser is more or less on. Looking with an oscilloscope to the output shows, that he is working from this voltage to maxmum.
All other outputs are working fine, so it looks that something has happened to this one. My idea is now to change the output amplifier chip TL084. Does it make sense, or is there another known part ... i don´t have a circuit diagram - maybe it´s possible to get it partly from Pangolin - mybe it´s secret -@
Thanks & kind regards
Ludwig