Voltage too high

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Voltage too high

Post by bill57 on Sun Jul 11, 2010 6:52 pm

Hello all...I have a Norelco model BX 640A/54 made in Holland. I just replaced the three 50/450 electrolytics and 3 tubes including the EM80 eye tube. I plugged it into a dim bulb tester with a 60w bulb. Radio played great up and down the dial on both AM and FM. Even picked up some on SW. Eye tube worked as it should. So I then plugged it directly into the house current of 120V and picked up very few stations. Eye tube stayed fully lit with no change between stations. I tried changing the voltage on the radio from 110V to 125V on the back of the radio but this caused a screeching noise so I put it back to 110V. So somehow I think it is drawing too much current and the dim bulb tester is making up for it. I did not change any other caps yet as I can't determine values and I haven't found a schematic.
So, any suggestions as to how I should proceed?

bill57
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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 12:18 am

I would change all the caps , and check all the resisters.
Iwill check on a schematic for you . Be kind of hard to do without schematic. Ihave a few sites that might have one .
Give me a little time . Smile

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 5:33 pm

is this your set it is a bx640ahttp://www.radiomuseum.org/r/philips_bx640a.html

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 5:58 pm

hence philips norelco

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Re: Voltage too high

Post by bill57 on Mon Jul 12, 2010 8:08 pm

Yes that is my set. Unfortunately I am not a member so I cannot access the schematic. Thanks for finding this as I have not even found a picture of it. I have tried other sites such as Nostalgia Air and Just for radios but no luck.
I have taken a closer look at the black caps and have found values such as 1500pf, 2200pf, 8200pf, 41000pf. If I can convert these to US numbers I can go ahead and replace these. Tons of resistors. Don't see any that "look" suspicious but I have not checked any yet. Not sure where to start. There are also some alum metal cans that I assume are also capacitors. I also noticed that while plugged into the dim bulb tester(by the way the bulb is burning bright) most of the sound is coming thru the small speaker with very slight vibration in the larger speaker.

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 8:23 pm

here is a conversion chart http://www.justradios.com/uFnFpF.html You want figure anything out till you recap this set. Might be worth to join radio museum for the schematic .

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 8:26 pm

I will do more searching for a schematic . When i get more free time. Smile

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Re: Voltage too high

Post by bill57 on Mon Jul 12, 2010 8:48 pm

Thanks Denver, That will help a lot. I did not see that on their site. I will try recapping and see how it does.

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 8:55 pm

Are you sure your set is 110 volts . Most sets in europe were 220 volts . Just wondering.

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Re: Voltage too high

Post by denver on Mon Jul 12, 2010 8:58 pm

[url]www.radiomuseum.org[/url] here is the site.

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Re: Voltage too high

Post by bill57 on Tue Jul 13, 2010 7:12 am

This radio has 3 settings on the back. It has a small black dial you pull out to change to 110, 125, or 220. It was set at 110 when I got it. I tried it at 125 but that made it worse so I left it at 110. So at least I'm sure that it is set at 110v. Maybe something is messed up in that switch. I'll check into that if changing caps don't help. I believe this radio was made for use in the US because it goes to 108 on the FM scale. Something I read somewhere that if the FM scale did not go to 108 it was not intended for our market. Be nice if there was more english on the parts.

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Re: Voltage too high

Post by Bill Cahill on Tue Jul 13, 2010 10:45 am

First, it makes sense. At higher voltage the leaky caps are worsenning, so radio plays worse..
Second.. On the caps. Those are in english. They are marked in Picofarads, or, in old layman's terms, micro-microfarads.
Hope this helps.
Bill Cahill

Some of them will need to be replaced by mica caps.

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Re: Voltage too high

Post by bill57 on Tue Jul 13, 2010 5:43 pm

Thanks Bill, yes it helps me understand some of these better. So for instance I am replacing a 1200pf with a .001uf, a 2200pf with a .0022uf, a 41000pf with a .04uf. Am I correct so far? However three have me stumped with these markings: 2K7P X.4, 1KP 0.4, 6K8P X.4
May be english but greek to me.These look exactly like the others but that is the only markings on them. Any help on these??

I also have two small alum cans about an inch long that are marked 10uf with a plus sign on one end so I'm going to replace them with electrolytics. I do plan on doing a couple at a time and then put power to it and see how it does.

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Re: Voltage too high

Post by Bill Cahill on Tue Jul 13, 2010 8:16 pm

Correct so far. I don't understand the last two. Are they larger than others? Physically, I mean.
Those to 10 uf are electrolytics. Be sure you put correct voltage ones in.
Try the known values first.
Bill Cahill

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Re: Voltage too high

Post by denver on Tue Jul 13, 2010 8:51 pm

I think that they are resistors, Philips had a bad habit of just printing part numbers on caps and resistors. We need to find you a schematic. But Philips resistors .were know to stay in tolarance for many years.

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