Need help: Hantarex MTC 9110

ignaciogc

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The problem: Resistor (R6) burns out if the chasis is connected to the tube.

Background info: The cabinet is a Z-shaped dynamo cab. I had to replace the power supply completely and had it running with no problems for a while. All of the sudden, my fuses start to blow as soon as I plug in the cab.
I played around a bit with the power connections, and found out the problem was the chasis. Power supply fuse blew if the chasis was powered on (with or without tube attached).
I did some research online and found that D-19 to D-23 could be the cause of the problem. I tested those, and found D-21 to the shorted.
I replaced D-21 with a 1N4007 diode (listed on the site I found the info about the diodes) and I could connect the power supply to the chasis (no monitor) without issues. The fuses did not blow and I had power going on the chasis.
I tested the "green" connector that goes to the tube (6 pins). I was getting about 350 volts coming out of 5 of those (one of the middle ones was the ground pin). I assume that is what the tube needs in regards to voltage... However, as soon as I connect the tube to the 6-pin connector, resistor R6 burns instantly on the chasis.
I tried replacing it, thinking that maybe the first one was bad, but the same thing happened again. - R6 is listed on the manual as 33E, 1.5A, 5% (I assumed 33E was 33Ohms)
I can connect everything else on the chasis and nothing goes wrong. but as soon as I power on the system with the tube powered on (green connector) R6 burns out.

Any tips would be greatly appreciated. For the most part I have NO idea of what I'm doing with the chasis. I just tested/replaced what I was told could be a problem, not because I knew what any of it did... I got my first arcade a couple months ago, so that's all the experience I have.

Anyone know what the problem might be and how to fix it?

Thanks!
 
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i was hoping to fix this one because the picture on the tube was very very good...

any tips would be greatly appreciated. thanks.
 
Don't remember where r6 is if its tied to the regulator or still in the power supply section then you know where to poke. maybe your flyback is shorted and is pulling too much current. I don't work on those enough for any killer tips but I know them well enough to be able to repair them no problem. if you hit a dead end and wish to send it in for repair I'd be happy to be of service.. thanks and best wishes. by the way i agree about the picture tubes being very good on the mtc9000.. they were not the best, but they were always stable and bright.
 
any way to test if the flyback is shorted/pulling too much power? I've found someone who has extra monitors, so I might get one of those if I cannot fix this one, but testing the flyback wouldn't hurt.
 
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