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Old 21st Feb 2021, 2:07 pm   #1
bionicmerlin
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Default Ferguson 3803 (1500)

Thought I would have a quick look at this as I’m waiting for bits for my other set.
It’s been in dry storage for a long time.
I have done a few checks ,the mains dropper was open circuit as normal.
I have put a new one in place waiting to be soldered in.
The question I have is on the PCB their is a resistor R96 that was just hanging and cooked the pcb track . The manual says it’s 2.2K 3 Watts
Mine is tested at 3.3K and looks to small to me
I was going to put a wire wound one in but the manual says on later versions it was fusible.
To complicate things I looked in another set of mine and the resistor is linked out . Hopefully someone can advise.
Also the frame output Transformer has at some time been dumping wax on the audio output valve. Any reason should I be looking for a fault causing that or not worry
I got a picture of the old resistor if that helps. Andy
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Old 22nd Feb 2021, 5:07 pm   #2
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Default Re: Ferguson 3803 (1500)

That does look like a 2W resistor - possibly a replacement? I'll need to look at the circuit to see what it does - 'HT decoupler' is an odd description. Could be a valve further on that's drawing too much current.
I wouldn't worry about the wax - they all do that, sir.
Tidy looking set.
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Old 22nd Feb 2021, 7:56 pm   #3
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Default Re: Ferguson 3803 (1500)

If it is fusible, I should be able to rob one of an old chassis for you. Just send me a private nessage
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Old 22nd Feb 2021, 9:35 pm   #4
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Default Re: Ferguson 3803 (1500)

Thanks both of you for the help.
I did think it a odd description as well but thought it just me. It supplies HT to the audio output section.
Update .
I have replaced it with a wire wound resistor.
And soldered in the new dropper. Gently powering up the set over about a hour at about 200 volts it sprang into life. Finally at full power for about 10 mins I have sound and a raster. The replacement resistor was only slightly warm so The wrong one could have been installed as Glyn said.
All caps felt cool . The next thing I will do is repair the tuner presets and take it from there . Andy
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Old 24th Feb 2021, 5:17 pm   #5
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Default Re: Ferguson 3803 (1500)

I now have to TV up and running sort off. So far the only components I have replaced are the resistors mentioned before.im a bit sceptical as so far the picture is very blotchy. It might not obvious on the picture but it’s not good. Also the brightness has to be turned fairly high . Contrast is pretty good . I also get some fly back lines under some conditions.
Picture is jumping on and off but I guess that’s valve bases or capacitors reforming .
What do the experts think please Andy
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Old 24th Feb 2021, 5:23 pm   #6
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Default Re: Ferguson 3803 (1500)

Forgot the picture. I know I have some capacitors that might be bad . Like those black ones.
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Old 25th Feb 2021, 10:18 am   #7
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Default Re: Ferguson 3803 (1500)

Those black ones need to go - you'll find they have changed value - usually upwards or gone leaky or both. I'd also change the audio valve's HT decoupler. This could well have caused your original resistor to cook. Also the two-tone capacitors are often just waiting to explode...
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Old 25th Feb 2021, 3:41 pm   #8
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Default Re: Ferguson 3803 (1500)

Glyn
Thanks I will get on with it Andy
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Old 1st Jul 2021, 2:10 am   #9
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Default Re: Ferguson 3803 (1500)

After all this time I have got back to this set. I have changed a good few caps and a couple resistors and the hight pot as it was very jittery.
It’s been working well but now developed a lazy picture frame from switch on taking a wile to fill the screen. I have tried a couple new PCL 805s but no better.
Also after about 5 to 10 mins the picture shrinks by about a inch then returns to normal.it might of might or might not do the same again randomly.. it dosnt affect the width just the hight.
Any idea appreciated Andy
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Old 1st Jul 2021, 8:02 am   #10
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Default Re: Ferguson 3803 (1500)

Check the boost line R123 and C89 electrolytic. Also resistors R101 and R102 values.
The presets are also suspect.

The 1500 manual update lists various changes in production and are worth making.
It's on here if you search.
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Old 2nd Jul 2021, 1:46 am   #11
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Default Re: Ferguson 3803 (1500)

Tony . Thanks for your advice. I have tested R123 and it’s about 30% high . R101 and R102 are only about 5% higher.
I will change R123 and i will change c89 at the same time and see how it goes.
My set must be a later version as the updates are factory fitted Andy
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Old 5th Jul 2021, 8:18 pm   #12
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Default Re: Ferguson 3803 (1500)

R123 has now been changed. C89 tested fine but I changed it anyways and that’s cured the problem and the set now works great.
Thanks everyone Andy
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