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Author Topic: Horiz. Width coil problem.  (Read 962 times)

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subcriminal

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Horiz. Width coil problem.
« on: November 03, 2005, 04:43:11 pm »
I've been trying to adjust the width down on this poxy Hatarex MTC9000, the width coil B1 has the main winding with ferrite core that's glued and heatshrunk, then there's another ferrite piece next to it in the same plastic housing that has a square hole in it. I have inserted a wooden dowel into it with the monitor on and turned it. The picture narrows then widens as I turn it clockwise and will keep doing this! It doesn't seem to be threaded. Does anyone know if this is normal? My first thought was that it is eccentric and not height that causes adjustment.
Also just two more n00b questions ;)
1. Would replacing the H-Amp pot (RV4 10kOhms) with one of a higher resistance give me anymore adjustment to narrow the screen? It's fully clockwise and still too big.
2. C36 Horizontal Retrace tuning cap. is 3n3 1500V would this be 3300nF?

stratjakt

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Re: Horiz. Width coil problem.
« Reply #1 on: November 04, 2005, 01:46:12 pm »
Yeah, that's how width coils work.  They give you a small range of adjustment, and go up-down-up-down like that.  It's just a magnetic slug in a plastic tube with wires wrapped around it.

1) I don't know for sure, but I doubt it.  10k ohm is probably as good as "open" in that application, so a higher resistance isn't going to make it any more open.

2) I believe 3n3 = 3.3 nF, or 3300 pF.  It's a euro marking convention http://my.execpc.com/~endlr/markings.html

And for the obligatory canned response:
Did you try a cap kit yet?