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 Post subject: Magnavox turntable troubleshooting
PostPosted: Nov Thu 07, 2019 1:16 am 
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Joined: Nov Thu 07, 2019 12:29 am
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My husband inherited his grandfathers Magnavox console, it worked great until just recently when the turntable stopped tuning on. I would love to get it working for him, but I have no idea where to start. When the power knob is turned to start there is an audible hum, but nothing happens. Any thoughts on where to start would be appreciated.

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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Thu 07, 2019 4:16 pm 
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Joined: Jan Mon 16, 2012 4:15 pm
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Location: Near Brandon, Iowa
Sounds like the turntable motor is bound up due to lack of lube. You can check for this condition by removing the platter (there is a "C" clip on the center spindle that must be pried off before the platter can be removed) and turning it on: if the motor just hums and its drive spindle can be determined not to be turning, that's the most likely problem. However, if the drive spindle IS rotating, you have another problem such as a petrified idler wheel or oil/grease on the drive friction surfaces.

Older Maggotboxes used a make of turntable named "Collaro", made in England. These seem to be well-respected turntables but they are relatively complex to service. If you can determine that your unit has a Collaro changer, you might want to try to find a service manual for it before plunging in and taking it apart.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Thu 07, 2019 4:28 pm 
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Location: Annapolis, MD
In my world, any record player that has been dormant for some time gets completely disassembled for cleaning, inspection and lubrication.

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Fri 08, 2019 11:30 pm 
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Location: Mountains of Mourne. Ireland.
Shoot up a photo of your changer, or look for a model number. It will be rubber-stamped or pasted to a paper tag under the mat/platter or on the bottom.

Post subject: Adding Photos to Your Post...
viewtopic.php?f=2&t=365653


:) Greg.
oh... When disconnecting interconnecting cables, label them with masking tape flags or directly with a sharpie.
otherwise you'll get lost when it comes to reassembly... :shock:
A digital camera makes a great aide-mémoire.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 2:17 am 
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Joined: Nov Thu 07, 2019 12:29 am
Posts: 7
Here is a photo for now. It will probably be Monday before I take anything apart as I would love for this to be a surprise for him. Thank you everyone for the responses so far. If there is any information I can use to start researching cleaning and lubricating I will start looking into that this weekend.


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Last edited by mrstaintedtemplar on Nov Sat 09, 2019 4:38 am, edited 1 time in total.
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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 2:47 am 
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Joined: Feb Wed 04, 2015 12:26 am
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This stereo uses a tube amplifier. It is imperative that the electronics are serviced before it is put in daily use. If a certain set of parts go out, it can at the very least take out parts that are irreplaceable or at the very worst, start a house fire.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 3:29 am 
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Okay, how do I go about a) finding a manual/tutorial/how to so we can service it or b) finding someone to service it?

Artcurus wrote:
This stereo uses a tube amplifier. It is imperative that the electronics are serviced before it is put in daily use. If a certain set of parts go out, it can at the very least take out parts that are irreplaceable or at the very worst, start a house fire.

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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 5:01 am 
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Not on Radio Museum, but a few sketchy leads here:
https://www.google.com/search?q=magnavo ... e&ie=UTF-8

Mrs. Templar---where are you located?

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 12:28 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
It's a Collaro Conquest. Your arm looks unusual/different to me... :shock:

Image

Here is a pictorial guide to servicing this changer.
https://www.vintage-radio.net/forum/sho ... hp?t=68177

Service manual...
https://www.vinylengine.com/library/col ... uest.shtml
I'm not a member here, but I think registration is free.

This is not for the faint of heart, or mechanically declined. lol
If you are confident enough to take it on, take lots of photos and sketches as it is really easy to get lost when it comes to reassembly.

Post (step-by-step) photos and ask questions before you proceed or damage something.
You will need a clean workspace that will not get disturbed.

Did I mention, take lots of notes and photos. Label all wires that you disconnect with masking tape flags.


You got tools and... maybe a mechanically minded buddy for backup?
:) Greg.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 10:35 pm 
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Joined: Nov Thu 07, 2019 12:29 am
Posts: 7
I'm thinking this might turn into me printing the srvice manual and allowing my engineer husband to do the service kind of project! Thanks again for all the info!

egg wrote:
It's a Collaro Conquest. Your arm looks unusual/different to me... :shock:

Image

Here is a pictorial guide to servicing this changer.
https://www.vintage-radio.net/forum/sho ... hp?t=68177

Service manual...
https://www.vinylengine.com/library/col ... uest.shtml
I'm not a member here, but I think registration is free.

This is not for the faint of heart, or mechanically declined. lol
If you are confident enough to take it on, take lots of photos and sketches as it is really easy to get lost when it comes to reassembly.

Post (step-by-step) photos and ask questions before you proceed or damage something.
You will need a clean workspace that will not get disturbed.

Did I mention, take lots of notes and photos. Label all wires that you disconnect with masking tape flags.


You got tools and... maybe a mechanically minded buddy for backup?
:) Greg.

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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sat 09, 2019 11:12 pm 
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Joined: Jan Tue 31, 2012 1:55 am
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Location: Mountains of Mourne. Ireland.
Howard Sams also published a Photofact (pretty pictures) service manual...
Set-390 Folder-5 for model Conquest. (March 1958)
Search ebay for... Photofact Collaro Conquest.

There was a revised model Conquest TC-340-E (August 1958)
Photofact Set-408- Folder-6

As I mentioned earlier, your model number will be under the mat.


Gary Stork at thevoiceofmusic.com is the go-to guy for parts (rubber +more) and advice.
via this link→ viewtopic.php?p=2958873#p2958873


Previous discussions here at arf...
"collaro conquest" site:antiqueradios.com
https://www.google.com/search?q=%22coll ... radios.com

:) Greg.

oh... as Artcurus has mentioned, it's important to service the Amplifier. You don't want to blow the backside out of your power transformer, or start a fire... :shock:
At a minimum, the electrolytic capacitors should be replaced.

For service documentation, you will need to locate a chassis number, rubber stamped or pasted to a paper tag on the Amplifier chassis.

Ask any questions.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sun 10, 2019 12:33 am 
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Sorry, just realizing I didn't respond to your question. I am in Southern California

pixellany wrote:
Not on Radio Museum, but a few sketchy leads here:
https://www.google.com/search?q=magnavo ... e&ie=UTF-8

Mrs. Templar---where are you located?

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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sun 10, 2019 4:41 am 
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Location: Lehighton, PA.
The 1-SC268F appears in the 1959 catalog. The turntable appears to be a Collaro model F-200C.

Attachment:
1-SC268F.jpg
1-SC268F.jpg [ 251.92 KiB | Viewed 558 times ]

Larry

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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sun 10, 2019 5:29 am 
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Posts: 973
the parts that need to replaced are capacitors, shaped like small cylinders and have designations such as .1mfd @350v. This is just an example. they are visible when you remove the amp and look at the bottom.

The amp will also have silver cylinders with designations such as 30mfd @ 450 v.

Be advised that the capacitors in the silver can have a definite positive and negative side, the polarity of the replacement caps must match the polarity of the ones in the can. Meaning that the negative side must be tied to the same point as the negative side of the can. When replacing these caps, completely disconnect the silver can.

You can order the replacement caps from Sal's capacitors on the right side of the screen. Just make sure to let Sal know which caps are in the can, so that he knows that these are electrolytics.

I hope I didnt confuse you too much, and please keep asking questions if you are lost.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sun 10, 2019 11:14 am 
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mrstaintedtemplar wrote:
Sorry, just realizing I didn't respond to your question. I am in Southern California

pixellany wrote:
Not on Radio Museum, but a few sketchy leads here:
https://www.google.com/search?q=magnavo ... e&ie=UTF-8

Mrs. Templar---where are you located?

No shortage of "radio fixers" there--if you want someone to do any of the work for you. You can start by contacting this club:
Southern Calif. Antique Radio Society (SCARS):
https://www.antiqueradios.org/

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Sun 10, 2019 9:22 pm 
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Joined: Feb Wed 04, 2015 12:26 am
Posts: 973
pixellany wrote:
mrstaintedtemplar wrote:
Sorry, just realizing I didn't respond to your question. I am in Southern California

pixellany wrote:
Not on Radio Museum, but a few sketchy leads here:
https://www.google.com/search?q=magnavo ... e&ie=UTF-8

Mrs. Templar---where are you located?

No shortage of "radio fixers" there--if you want someone to do any of the work for you. You can start by contacting this club:
Southern Calif. Antique Radio Society (SCARS):
https://www.antiqueradios.org/


Shango to the rescue! :wink:

Couldn't resist 8)


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Wed 13, 2019 7:31 pm 
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Posts: 3512
Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
"The 1-SC268F appears in the 1959 catalog. The turntable appears to be a Collaro model F-200C."

Yep, could be. Or maybe one of these. Lift the mat to expose the number.

Bill J.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Thu 14, 2019 5:47 am 
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Yes, the unit may need to be serviced as above. But I'm wondering if the turntable is stuck halfway through it's change cycle and the rubber wheels don't have enough grip left to bring the changer through to the end. Turn the platter with your hand clockwise about 5-6 rotations and see if that will "reset" it.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Tue 19, 2019 11:32 pm 
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That totally worked! My grandfather, who is an electrical engineer is here looking at it for me and he said everything looks good to him right now and at this point he wouldnt touch the capacitors. He did ask where we can find the part numbers for the tubes as he hasn't looked at a design like this in "50 bloody years". He is also really impressed with the whole amplification system.

I did take the plate off and looked at the underside from the back.

Shane1 wrote:
Yes, the unit may need to be serviced as above. But I'm wondering if the turntable is stuck halfway through it's change cycle and the rubber wheels don't have enough grip left to bring the changer through to the end. Turn the platter with your hand clockwise about 5-6 rotations and see if that will "reset" it.


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 Post subject: Re: Magnavox turntable troubleshooting
PostPosted: Nov Wed 20, 2019 1:39 am 
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Posts: 1614
Location: 77001
All the old electrolytic and wax/paper capacitors should be
replaced.
Resistors should also be checked to be w/in value tolerances.

At this point, if the capacitors are original, it is only a matter of time
before a critical one fails.

Then you may have more extensive repair and/or
replacement of costly parts, such as a power transformer.

Capacitors are inexpensive and great insurance for good
future performance of this nice hi-fi.

Hotwax


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