Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Aug Fri 23, 2019 3:39 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 14 posts ] 
Author Message
 Post subject: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:11 pm 
New Member
User avatar

Joined: Sep Sat 29, 2018 9:14 pm
Posts: 16
I unscrewed the 4 screws and the antenna screw but there's these rivets attached to a metal box, which looks like it could be an interlock. I tried pulling the rivets and pulling the whole back but I don't want to break it. What can I do?

Attachment:
zenith1.jpg
zenith1.jpg [ 279.76 KiB | Viewed 357 times ]

Attachment:
zenith2.jpg
zenith2.jpg [ 121.71 KiB | Viewed 357 times ]


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:12 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 32439
Location: SoCal, 91387
Are there screws underneath? Did you remove the knobs? What model Zenith is it?

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:19 pm 
New Member
User avatar

Joined: Sep Sat 29, 2018 9:14 pm
Posts: 16
fifties wrote:
Are there screws underneath? Did you remove the knobs? What model Zenith is it?

Yes, I tried unscrewing the screws underneath but it was for the whole chassis and it was just loose in there and i still couldn't get the back off. I took all the knobs off of it also. It's a model B728F.


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:26 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 9227
Location: Mountains of Mourne. Ireland.
Image

Image

Image
https://www.radiomuseum.org/r/zenith_b7 ... assis.html

Greg.


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:28 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 32439
Location: SoCal, 91387
Ahh, Greg to the rescue. Those two screws underneath need to come off. You may also need to take the clock knobs off.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins//////////////////


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:29 pm 
Member
User avatar

Joined: Jan Mon 18, 2010 2:13 am
Posts: 18732
Location: Dayton Ohio
That riveted box is the interlock, it should pull right out.

-Steve

_________________
Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:38 pm 
Member
User avatar

Joined: Jul Mon 06, 2015 11:25 am
Posts: 254
The interlock block should slide off the two connecting pins. Can you insert a screwdriver between the two pins and apply a little leverage?


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 10:51 pm 
New Member
User avatar

Joined: Sep Sat 29, 2018 9:14 pm
Posts: 16
azenithnut wrote:
That riveted box is the interlock, it should pull right out.

-Steve


This dude was right, I added a little more force and it slid out.

Now, does anyone know a way to lubricate the clock without having to take the whole thing out? I really don't feel like de-soldering wires. Not to mention i don't have a solder iron or solder. The clock barely runs and it makes a loud scraping sound, it needs oil badly.
Attachment:
zenith4.jpg
zenith4.jpg [ 175.63 KiB | Viewed 331 times ]

Attachment:
zenith3.jpg
zenith3.jpg [ 152.74 KiB | Viewed 331 times ]


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 11:13 pm 
Member

Joined: Jan Mon 23, 2012 7:04 pm
Posts: 113
Location: The South Side of Indianapolis, Indiana 46225
You'll have to take the clock off and apart to lube it. It could be dirt in the movement, lack of oil in the rotor (round copper colored thing), or both.


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 11:18 pm 
New Member
User avatar

Joined: Sep Sat 29, 2018 9:14 pm
Posts: 16
ehscott1473 wrote:
You'll have to take the clock off and apart to lube it. It could be dirt in the movement, lack of oil in the rotor (round copper colored thing), or both.


What if I just spray some Wd-40 or lithium grease in there?


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Tue 13, 2019 11:36 pm 
Member
User avatar

Joined: Jan Mon 29, 2018 5:58 pm
Posts: 154
Location: Nipomo, CA 93444
That's a Telechron movement. Most of the critical moving parts are in that copper unit, so I don't think spraying any lube inside there will help much. It IS possible to drill a hole in the sealed unit and relube it, but you're probably better off looking for a replacement. Search for Telechron rotor and you'll find tons of info.

_________________
-Jim
W6JCR


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Wed 14, 2019 12:23 am 
Member
User avatar

Joined: Dec Mon 08, 2008 8:27 pm
Posts: 9931
Location: alameda,CA
So you will need to take the copper looking drum out of the movement. There's 2 screws on either side. The stack of metal plates that goes around it is an electromagnet and they separate. Once you pull the screws, use a screwdriver blade to slowly pull the two halves of the plates apart and remove the copper thing ( the rotor ).

Now here's how you can lube it:

A: Heat the whole drum up with a soldering iron or with a plumbing torch set to very low. Dribble a bit of oil onto the output shaft ( has a gear) the oil will probably start boiling. Let it do so for a bit, turn off heat, let it cool and apply more oil. As it cools the new oil will get sucked in. The BETTER way is to buy some clear fuel hose. I can't recall the diameter but I have a few pieces that snug right over the output shaft meaning I can fill that tube with oil and then as it boils up in the tube, I'll let it cool and there's thus more oil to draw from.

B: When you re-install make sure that the 3 little "nipples" that stick out of the bottom of the rotor are flush with the mounting surface and that the output shaft makes contact with the gears.


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Wed 14, 2019 3:24 am 
Member
User avatar

Joined: Apr Sun 01, 2012 9:55 pm
Posts: 10372
Location: Seattle, WA
Another way I have heard for lubing Telechron rotors is as follows:

  • Half-fill a clean, empty baby food jar with lightweight oil (eg. sewing machine oil) and put it in the freezer overnight.
  • Put the rotor in a double boiler on the stove, heat it up till the water is boiling, then give it a few minutes for the rotor to come up to temperature.
  • Take the jar of oil out of the freezer, then use tongs to take the hot rotor out of the double boiler and submerge it in the jar of cold oil.

As the rotor cools it will suck in oil, like Bob said.

_________________
Rodney -- KG7EPW
Measure it with a micrometer, mark it with chalk, cut it with a chainsaw.


Top
 Profile  
 
 Post subject: Re: Can't get the back off of Zenith radio, help?
PostPosted: Aug Wed 14, 2019 5:28 am 
Member
User avatar

Joined: Dec Sat 24, 2011 9:17 pm
Posts: 4470
Location: Vancouver Island, Canada
Also, you will need a soldering iron, because the filter caps, electrolytic capacitors, in the radio section should be replaced.
They are old and dry and can burn out now that you are powering the radio up again.

If the rotor does not accept oil the first time, try it again. Usually oil is all it needs, but sometimes the gears and bearings are worn excessively, and a reconditioned rotor is needed. They are available because there are 1000's of clock radios and clocks that use the same unit. Another source of parts is another cheap old clock radio, and there are plenty of those. Good Luck.

_________________
Watch the doughnut, not the hole.
Burl Ives, RIP, oldtimer.
[:l>)


Top
 Profile  
 
Post New Topic Post Reply  [ 14 posts ]  Moderators: Marcc, Norm Leal

All times are UTC [ DST ]


Who is online

Users browsing this forum: kat969, lorenz200w, Majestic-12 [Bot] and 20 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB