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Old 23rd Dec 2008, 9:23 pm   #1
mark pirate
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Default Marconi tuner problem

Hi all, can anyone help with a fix for this problem? I have a marconi mini
(thorn tuner) the tuner buttons will not stay in, after dismantling the pushbutton assembly, it appears that three out of the four plastic washer thingies that hold the ends of the springs have disintegrated, can these be got? or is there a workaround (see pics)

Mark
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Old 23rd Dec 2008, 9:27 pm   #2
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Default Re: Marconi tuner problem

Why not try a plumber's merchant or B&Q for washers you may be able to use? Use the one that's left for size measurement.

Cheers,

Steve P.
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Old 23rd Dec 2008, 9:54 pm   #3
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Default Re: Marconi tuner problem

Hi Steve, the problem is that on further inspection, the washers seem to be secured to the brass bits by lugs & also seem to be threaded (see pics)

Mark
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Old 23rd Dec 2008, 9:59 pm   #4
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Default Re: Marconi tuner problem

Just an idea. I've never had this happen it must be said. How about something really coarse like gluing the top end of the spring in place very securely?

Yes it's coarse but it may work...

Cheers,

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Old 23rd Dec 2008, 10:07 pm   #5
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Default Re: Marconi tuner problem

Hi steve,
Quote:
I've never had this happen it must be said. How about something really coarse like gluing the top end of the spring in place very securely?
Not a bad idea, but i can't see a way of doing it!
i dont have all the bits of the broken ones to attack with araldite
and ss law decreed when i removed the intact one.... it broke
Mark
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Old 23rd Dec 2008, 10:13 pm   #6
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Default Re: Marconi tuner problem

Hi Mark.
I've one of these sets in the loft which I doubt I will ever do anything with, I really was looking for a 980 the 405line model, so if you haven't worked out a fix for it after christmas I will pull out the tuner and see if its ok you can have it or the full set.
cheers
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Old 23rd Dec 2008, 10:46 pm   #7
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Default Re: Marconi tuner problem

Hi Mark.

I repaired the push button units of both my Thorn 3500 and Thorn 8500 using cut down hollow wall fixings from Homebase. If you check out this thread on post #33 you'll see what I mean.

Hope that helps.
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Old 24th Dec 2008, 8:46 am   #8
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Default Re: Marconi tuner problem

Mark
I do remember these failing, but not how I sorted them.

If you have no luck, PM me and bung the tuner over here - I have quite an extensive "machine shop" and know how to use it.
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Old 24th Dec 2008, 10:13 am   #9
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Thumbs up Re: Marconi tuner problem

Hi all, thanks for the suggestions, i am at work this morning & have had a root around the parts bins & come up with a few bits that can possibly be modified to do the job i will keep you posted....

Mark
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Old 25th Dec 2008, 3:27 pm   #10
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Thumbs up Re: Marconi tuner problem

Hi all, thanks for all the help, i have now fixed it
I found a new use for an earth clamp washer, as used at work.
I further stripped the pushbutton unit, enabling me to fit the drilled out clamp
washers & fit the springs & brass units back, then re-assembled the unit & fitted it to the tuner (see pics)
I can report complete success i am now well on the way to completing my
restoration of this little tv, and hopefully it will appear as a success story very soon.

Mark
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Old 25th Dec 2008, 4:25 pm   #11
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Default Re: Marconi tuner problem

I wonder if this is the tuner where the rods finally act upon a spring loaded bar? If it is, the biggest problem I ever encountered was 'poor reset', i.e. the inability for the tuner to go back on station each time, forcing the customer to re-adjust the tuning each time. This was often caused by a cracked solder joint, at either one or both ends where the bar is soldered to the arms that swing the tuning capacitor spindle. Easy to fix with a meaty soldering iron but also worth a check while you have the tuner out.
A similar fault can be caused by poor earthing springs within the tuner but the bar was often overlooked, only to be found after doing all the difficult spring changing job. I always reckoned that the GEC tuners gave more earthing spring trouble than Thorn ones though.

Les
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Old 25th Dec 2008, 6:24 pm   #12
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Default Re: Marconi tuner problem

Hi Les,
Quote:
I wonder if this is the tuner where the rods finally act upon a spring loaded bar? If it is, the biggest problem I ever encountered was 'poor reset', i.e. the inability for the tuner to go back on station each time, forcing the customer to re-adjust the tuning each time.
Yes this is the spring loaded bar type, luckily the tuner itself is fine, as is the soldered bar, now the tuner is back in the set & staying tuned nicely.
The picture has also improved since this morning, as this set has not been used for years due to the tuner fault.

Mark
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Old 25th Dec 2008, 6:50 pm   #13
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Default Re: Marconi tuner problem

This is the 1590 chassis. If you don't have the service manual I have the Thorn service and user manuals as I have had the Ferguson version from new. Also the Les Lawry Johns television service articles.

I can scan them if you don't have them.

Keith
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Old 27th Dec 2008, 10:43 pm   #14
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Default Re: Marconi tuner problem

That's brilliant Mark and definately neater and more robust than my repair.

Well done indeed.
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Old 28th Dec 2008, 9:34 am   #15
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Default Re: Marconi tuner problem

Perfect job, Mark, and one for the archive!
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Old 28th Dec 2008, 12:00 pm   #16
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Thumbs up Re: Marconi tuner problem

Hi all, Thanks again for all the help.
Quote:
This is the 1590 chassis. If you don't have the service manual I have the Thorn service and user manuals as I have had the Ferguson version from new. Also the Les Lawry Johns television service articles.

I can scan them if you don't have them.
Yes please Keith, i don't have any info on this set, does anyone know when
this set was made, i think it's around the early 1970;s?

Quote:
That's brilliant Mark and definately neater and more robust than my repair.
Thanks taz, Don't know if its neater though, i looked at your solution to this problem, as i did not have any rawlplugs, the washers i used seemed ideal for the job, and so far the tuner is behaving
Blokes in sheds are what makes this country great
A very happy new year to all
Mark
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Old 28th Dec 2008, 12:49 pm   #17
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Default Re: Marconi tuner problem

H Mark

I'll scan the items and post them today. I bought mine in 1976, just after VAT was reduced, cost me 52.50 if I remember correctly. The service information is dated 1972 so I guess it was designed around then.

As it has an isolated chassis I've added an audio and video output and very surprisingly the video bandwidth is sufficient to drive a teletext decoder with external monitor to display the data.

Keith
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Old 28th Dec 2008, 1:38 pm   #18
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Default Re: Marconi tuner problem

Here are theThorn user manual and service manual for the 1590/91 chassis and the Television article by Les Lawry Johns.

The user manual is a little disjointed as the fold over sections had to be scanned separately as they didn't fit on the scanner.

I also have the tube guarantee card but I think the 2 year warranty on the tube has expired

Keith
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File Type: pdf TCE1590-LLJ.PDF (827.4 KB, 368 views)
File Type: pdf TCE1590-TCE SM.PDF (1.44 MB, 850 views)
File Type: pdf TCE1590-TCE UM.PDF (500.2 KB, 166 views)
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Old 30th Dec 2008, 3:00 pm   #19
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Default Re: Marconi tuner problem

Hi Keith, many thanks for posting the manuals.

Quote:
I also have the tube guarantee card but I think the 2 year warranty on the tube has expired
Being a mullard tube, it will not be needed

Mark
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