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Troubleshooting degauss on Hantarex MTC9000
Nipedley:
Hi folks :-)
My Hantarex MTC9000's degauss circuit has never worked, I'm in the process of refurbishing my cab & monitor and would like to get this sorted at last
When I first got it, the degauss coil had been disconnected. I connected it up and the fuse did not blow, however also no degauss function. I've just tested the circuit from the schematic in the Hantarex MTC9000 manual and all seems well. What I am unsure how to test is the coil itself and the positor. The push button function is disabled as there's a factory link (P34 on schematic) bypassing it so that degauss is always on. It appears that this board is either power on degauss or push button degauss.
I' m getting a reading of 33 ohms between the 2 common pins of the positor (degauss button & voltage to positor, and positor to coil) and 1.7k ohms on the other side of the positor to coil & voltage. Is that normal?
Also, how do I test the degauss coil itself - should it be a dead short or should there be resistance, and if so what kind of range? As the fuse doesn't blow, I'm guessing nothing is actually making it to the coil?
Many thanks ! :-)
ed12:
when u open p34 u are to insert a temp pushbutton
#3 in tec ref.
if the deguass coil is not open i would go after the ptc
mertering a ptc is a pain in the a&& (postive temp coeffecent)
ed
Nipedley:
Thank you :-) so resistance between the two wires from the coil itself should be 0 ohms?
I'll check that tomorrow (left my multimeter at work.. doh) and if that's all good I'll source a replacement PTC
My cabinet came with a push button on the main service panel but as you say the chassis would need p34 open for that to work. Perhaps the monitor was replaced during it's life
Many thanks
grantspain:
European mtc9000 chassis have 240vac for the degauss circuit,so you should have 4 wires onto the power connector-check that voltage
ptc you can get on ebay uk
princess prin prin:
--- Quote from: Nipedley on May 03, 2017, 12:31:16 pm ---Thank you :-) so resistance between the two wires from the coil itself should be 0 ohms?
--- End quote ---
About 23-25ohm.