Hantarex 900e Flyback?

danweb

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I have a couple of these monitors and a spare Chassis or two and they all have the same problem, the 115v from the power supply section is up around 145V. Based on what I have read this indicates the flyback is bad. Seems strange that ALL the flybacks on all these Chassis are bad, but they all have the same symptoms. I have no high voltage and no other way to test the flyback. Are these monitors known for flyback problems? Anyone know of a source to get a couple of replacement Hantarex 900e Flybacks (HR6020) at a good price? They seem to be at least $40 each from the usual sources.

Thanks,
Dan
 
Are you connecting them with an iso transformer? It's "mandatory", you know. Check the power you supply to your monitors: i have 2 of them and no problem with flybacks
 
I've replaced a few 900E flybacks. Every bad one I've seen.....that giant resistor on the side of the chassis would cook to the point of smoking.

Edward
 
I've replaced a few 900E flybacks. Every bad one I've seen.....that giant resistor on the side of the chassis would cook to the point of smoking.

Edward
I am using an ISO to test them and the games they came out of had them, so that is not the culprit. The last one I have here worked for a day or two, then the HV dropped to about 10KV, then to zero. The large ceramic resistor isn't hot at all, in fact there is no voltage across it on any of these chassis. Think maybe its not the flybacks? That would be good news. Both fuses are good and there is 120 v AC coming into the bridge rectifier; at the output of the rectifier is 145V DC if I recall correctly. The large Cap (filter cap?) at the output of the bridge tests good. I initially thought the problem was in the voltage regulator section, but I used one of Randy's flowcharts and it indicated that the symptoms are charactaristic of a bad Flyback.

Thanks,
Dan
 
I am using an ISO to test them and the games they came out of had them, so that is not the culprit. The last one I have here worked for a day or two, then the HV dropped to about 10KV, then to zero. The large ceramic resistor isn't hot at all, in fact there is no voltage across it on any of these chassis. Think maybe its not the flybacks? That would be good news. Both fuses are good and there is 120 v AC coming into the bridge rectifier; at the output of the rectifier is 145V DC if I recall correctly. The large Cap (filter cap?) at the output of the bridge tests good. I initially thought the problem was in the voltage regulator section, but I used one of Randy's flowcharts and it indicated that the symptoms are charactaristic of a bad Flyback.

Thanks,
Dan

From what you've described....I'm also thinking power supply section, but you checked that out...so, I don't know. An ISO has nothing to do with that big resistor.....and bad flyback or not, you should have juice at that resistor (if we're talking about the same resistor)...unless a fuse blew. I'm unaware of a Fromm 900E flowchart.......are you using his 9000? Actually, regardless of 900E or the 9000.....if no fuses are blown, you should have voltage at those big resistors.

Edward
 
I am talking about the big ceramic located on the side by the fuses. No voltage across it. I get around 145 volts at the output of the bridge. You are right about the flowchart, I was using the 9000. Seems to indicate a VR failure; is that TR9, the bottlecap under the ceramic?

- Dan
 
Yeah, the VR is TR9......it's located right under the big 30 watt resistor. Have you checked that resistor. It's supposed to be 220 ohms.....believe it, I've actually seen these go open.

Edward
 
I just checked the 220, it meters good. Thanks for all your help, I am going to try and get my hands on the a replacement for the VR and see if that does the trick.

Thanks,
Dan
 
I replaced TR9 and now I am getting 10 KV from the flyback. The adjustment pot doesn't change the output. The B+ Voltage (measured across the big resistor) is about 70 volts DC. Any other thoughts?

Thanks,
Dan
 
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