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Old 10th Oct 2015, 12:53 pm   #1
Alex1949
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Question Help needed with Dial Cord Stringing

Hello everyone,

I just registered to your forum because I'm in need of some advice.

I have a Marantz 2220 Stereophonic Receiver, and lately the pointer could not be operated as it was stuck in a particular point.

I opened it, and I was trying to increase the string tension by inserting a spacer in the loop, where the string loops into the tension spring.

Is there any other way to fix this problem without having to restring it?
I read somewhere that you can apply some material that improves friction, but I didn't find something specific. Would this serve as a long term solution?

Furthermore, I was also wondering if I need to apply some material on the area where the pointer slides(picture attached below), in order to reduce friction.

Any suggestions?

Thank you very much in advance for you help!

Alex
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Old 10th Oct 2015, 7:18 pm   #2
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Default Re: Help needed with Dial Cord Stringing

The tension is applied by a spring fitted to the circular piece mounted on the tuning gang. Perhaps there is too much friction in the pulleys or the spring is not giving the cord any tension due to stretching of the cord?
The attached sketch shows how the cord should be threaded, just in case you have to replace it at any time.
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Old 10th Oct 2015, 7:42 pm   #3
Station X
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Default Re: Help needed with Dial Cord Stringing

I'd unhook the cord from the pointer, if that's possible, clean out the groove in the block it's attached to and clean the "track". It might help to apply a smidgen of silicone grease to the track, but not too much or it'll attract dust.
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Old 10th Oct 2015, 7:43 pm   #4
60 oldjohn
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Default Re: Help needed with Dial Cord Stringing

Hi Alex, Is the tuning capacitor free to turn? A lot of capacitors from 1970s /80s are seizing due to hard grease.


John.
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Old 11th Oct 2015, 8:15 am   #5
stevehertz
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Default Re: Help needed with Dial Cord Stringing

If you apply a small droplet of lubricant to those tuning cord nylon roller bearings/centres, make sure it's silicone lube, not petroleum based ie not WD40 or sewing machine oil. You can buy cans of silicone lube. Alternatively, spray some Mr Sheen or similar silicone based household spray into its lid, then use a tool such as a fine screwdriver or a pointed awl to introduce it to the bearings. I'm not saying that that is 100% the problem, but with sticking tuning cords, every little helps. I personally would not apply any form of lube to that track base, I'd carefully clean and buff it (and associated parts that slide) to a nice clean shine. Actually, you could also use Mr Sheen for that purpose, ensuring that no polish is left, however a non-sticky, micro coating of silicone will prevail. That's a trick I use on sticking curtain tracks with great success.
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Old 11th Oct 2015, 7:02 pm   #6
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Default Re: Help needed with Dial Cord Stringing

Hi.

You can use rosin. It's available on ebay and from music shops ( it's used on bows ) about £3
Scrape the block to get some fine powder then apply to the cord near the spindle ( the one the knob drives )
It will increase the friction between the cord and the spindle and might well sort your problem!

Cheers, Pete.
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