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 Post subject: EICO 720 function switch
PostPosted: Jun Wed 19, 2019 1:06 am 
New Member

Joined: Jun Fri 10, 2011 8:14 pm
Posts: 8
hi all, got a nice eico 720 but the function switch wont turn..
any help on finding a replacement is greatly appreciated.
I have tried the usual wd40 tricks and finally switched from pliers
to a vicegrip which did turn it but not good enuff to use a knob.
thank you Jim kw3u


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 Post subject: Re: EICO 720 function switch
PostPosted: Jun Wed 19, 2019 4:42 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 18574
Location: Albuquerque, NM 87123
Put the vicegrips on. Use a propane torch and heat the shaft a bit, then put some oil on the shaft at the retaining ring; twist slightly back and forth until it loosens. You might spray some WD-40 on the inside 1st. This almost always works for me.


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 Post subject: Re: EICO 720 function switch
PostPosted: Jun Wed 19, 2019 6:36 pm 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 28021
Location: Detroit, MI USA
Sometimes you can carefully drill into the side of the bushing with a tiny (1/16" or so) bit allowing you to get the penetrant even further inside.

For this, I would use PB Blaster even though I don't think the issue is rust, but the lubricant has dried up or if it's a pot metal bushing, then that has shrunk and now too tight on the shaft. If there's any possible way of disassembly without ruining the switch, once it's free I'd pull the shaft out of the bushing and clean it thoroughly and apply some grease.

_________________
Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: EICO 720 function switch
PostPosted: Jun Wed 19, 2019 8:25 pm 
New Member

Joined: Jun Fri 10, 2011 8:14 pm
Posts: 8
been sitting a few days, tried again after a shot of ballistol and turning ok however it turns continuesly ,
anyway was unable to get grid current and no output pretty sure i screwed it up so letting it go for parts.
anyone needing parts from it let me know. keeping the rectifier tube as a spare for my eico 723.
tnx all. Jim kw3u


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 Post subject: Re: EICO 720 function switch
PostPosted: Jun Thu 20, 2019 2:53 am 
Member

Joined: Dec Sun 14, 2008 3:33 pm
Posts: 884
Location: Tokyo
Jim, I have no experience with the 720. However, problems with the function switch with the 720 and similar tx (HT-40, DX60, etc) were common. Before giving up on it, why don't you move this to the Communications Receivers and Transmitters forum and see if there are some suggestions. There's also the boatanchor forum at qrz.com:

https://forums.qrz.com/index.php?forums ... ipment.68/

Rob


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