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Panasonic 36sx31e degauss circuit problems

This set came in with a blown 6.3A fuse. I have no schematic but I checked for any obvious problems and found none. So I replaced the fuse with a 4.0 amp just to test it, (I have about 150 of this size in the shop so I don't mind sacrificing a few). When testing the set, I disconnected the degaussing coils (because they were too short to pull the chassis out with them connected). I powered the set up and except for purity problems it looked pretty good. It ran for about an hour and then I shut it off for about 30 minutes before turning it back on again. Again it came on fine and stayed on. I degaussed it manually, disconnected power and plugged the coils back in. When attempting to power it up this time it initially powered up, then I heard the degauss relay click, I heard a loud hum from the degaussing coils and the fuse opened. I then waited about a half hour, put a 6.3A fuse in and powered the set up. It came on fine. I've connected a 10 amp meter in series with the AC line and each time I've tested it after letting the degauss thermistor cool down, as soon as the degauss relay activates it pegs the meter for a very brief instant and then settles back down to normal. It has not taken out the new fuse though. I know initial current on degauss is high but how high is OK I'm wondering? Should I just change the thermistor for good measure? I hate shotgunning things but I'm not sure. And also I must ask as simple as this circuit is should I perhaps suspect something else? Any comments or advice are most sincerely appreciated. Lenny Stein, Barlen Electronics

Reply to
captainvideo462002
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I beleive there is a fuse problem with these units, where the degaussing draws too much curent, just at initial startup. Try a "slightly" higher fuse, & I think you may have to replace the thermistor, & check back for more posts attached to yours, to be sure. Rono.

Reply to
Rono

Where do you find it on the Panasonic web site?

The have a notation to replace the thermistor, but I can't find anything about a different part.

Leonard

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Reply to
Leonard Caillouet

"Unit is dead. Fuse F601 blows (black). Excessive AC current flow through the degaussing coil. A change in the characteristics of D808 can cause excessive current to flow through the degaussing coil and blow F601. Replace D808."

Leonard: This is a copy/paste from Panasonic's Web Site. If you check the new part supplied, maybe even with the same part number, you may find a difference in type and parameters. Please post your in-depth discoveries regarding this. Thanks!

Reply to
Art

Art,

I found the tip that you posted below, many times actually. The last time I replaced a thermistor in one of the sets with that tip I found the new one to be identical to the old one. That is why I asked. It sounded like you actually had some info on a new type thermistor but it appears you are just speculating.

The last time I talked to Panasonic on the matter they knew nothing of any changes in the part. There has been a change in the part number, but as I said, it was identical in appearance. I tried to verify if I was getting the correct part and no one could confirm that there was a difference. The best info that I got from Panasonic on the issue was to make sure that the replacement fuses were time delay types.

I was hoping that you had some actual documentation on the parts. Your original post made it sound like there was something on the site. In fact, you were just making an assumption on the matter. Do you have some real info from Thomson or Philips or are you just blowing smoke on that, too? Some of us like to deal in real information, rather than speculation.

Leonard

Replace

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Reply to
Leonard Caillouet

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