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BG 1202 50 to 60 Hz, Mexico

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Søren Mexico
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Søren Mexico Posted: Wed, Jun 20 2012 12:39 AM

Normaly I have to repair my wife's car, but this is more important

First of all the number and type, if not Martin will ask for itSmile

Bottom cover of and inside the envelope, a very good sign, still glued to the cover

Inside the envelope, the drawing

The inside looks like new, this deck didn't see much use, on all adjusting screws I can see the lacquer placed from the factory, screws has never been touched (red arrows)

Drive out, everything dry and with small amounts of dry grease, but nearly all clean.

Drive with suspension out, motor open

The belt drive wheel, I will have to make a new one 20 % smaller maybe in poliamide

Other side

Collecting Vintage B&O is not a hobby, its a lifestyle.

Dillen
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Dillen replied on Wed, Jun 20 2012 6:39 AM

Nice project !  Yes - thumbs up

And now some useless info:
Because of very high demands, B&O made a conversion kit for this. Incredibly rare, I never saw one but it
was available at some point.
The kit had a new motor and platter (with strobo markings for the Beogram 1200).

Martin

Søren Mexico
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Repaired the wife and her car yesterday, but today I got to the more important work.

Here the prototype, made in Nylonacero, Polyamide for mechanics, it a little oversize where needed, I will have to refine it anyway.

The shaft is the original, not yet fastened to the wheel, will epoxy it when done testing the fit and location

As you see it fits perfectly to the idler wheel.

here side view, the wheel is overall diameter 28,5 Mm. the original is 35.4 Mm, so a little oversize, its easier to machine down if too big, than make a new piece, all together a 1.5 hour work. in the weekend I will clean, lubricate and install everything to see if I get some rotation. Then try to manipulate the belt to work with the new wheel, going to be interesting.Big Smile

 

Collecting Vintage B&O is not a hobby, its a lifestyle.

sonavor
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sonavor replied on Thu, Jun 21 2012 11:19 PM

Fascinating project Søren.  Great work.

Ricardo
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Ricardo replied on Fri, Jun 22 2012 12:02 AM

interesting way of solving the 50/60 hz conundrum.

Menahem Yachad
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I love it! I really enjoy seeing you guys overcome obstacles!!!!

Best of success!

Menahem

Evan
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Evan replied on Fri, Jun 22 2012 5:12 PM

Brilliant job, Søren Yes - thumbs up

I opened up my 1202 once so far (this was a while ago) and remember finding my envelope with schematics as well Big Smile

Also - I have a special surprise upgrade for my 1202, coming soon to a BeoWorld thread near you.

Beo4 'til I die!

Søren Mexico
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Evan:
I have a special surprise upgrade for my 1202, coming soon to a BeoWorld thread near you.

Tell tell, maybe I can use it

Collecting Vintage B&O is not a hobby, its a lifestyle.

Søren Mexico
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Got a little farther, took the the whole drive apart in detail, everything very hard and full with old very hard grase, had to scrape some of it off with a screwdriver

All clean

Together again, the new wheel was epoxied to the shaft, waiting for it to dry, before putting load on it, the motor was aligned with, checking the space around the rotor with linings, perfect fit, and runs very light.

Tomorrow I will try belt and functions, and I hope, play a record. Maybe I will have to adjust the new wheel a little

Collecting Vintage B&O is not a hobby, its a lifestyle.

Ricardo
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Ricardo replied on Sat, Jun 23 2012 1:39 AM

Perhaps we should start a betting line on what that first record will be.

I give 4 to 1 odds its Blondie - Parrallel Lines

Søren Mexico
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Hold your bets, belt on, has some tension, cleaned it with a dry rag

Put on the platter a 30 Cm record and a 60 Hz strobo disk, the speed control was adjusted from lowest speed to correct speed ending at 1/3 from max. speed, attached the pickup, cleaned pick up and Anita, connected to my BM 4000 and of we went, good music, the silent contact makes some noice starting and stopping, but sound comes out just fine, pickup weight adjusted at 2 Gr.

I'm happy, now onto details.

Collecting Vintage B&O is not a hobby, its a lifestyle.

Søren Mexico
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After plaing a couple of records and testing all functions, set down points and set off, I checked the speed again, too fast, lowered to correct speed, and is now nearly in the middle with the adjustment, thats just perfect, and no noices what so ever from the drive, conclusion: Its easy to convert to 60 from 50 Hz, Big Smile

Collecting Vintage B&O is not a hobby, its a lifestyle.

Rich
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Rich replied on Sun, Jun 24 2012 4:45 PM

eugene1960:

Perhaps we should start a betting line on what that first record will be.

I give 4 to 1 odds its Blondie - Parrallel Lines

For me, it's always Led Zeppelin II whether LP, cassette, CD or mp3.

I wonder how many hits in the forum archive you'd get if you searched on "Whole Lotta Love test."


Rich
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Rich replied on Sun, Jun 24 2012 4:45 PM

Søren Mexico:

After plaing a couple of records and testing all functions, set down points and set off, I checked the speed again, too fast, lowered to correct speed, and is now nearly in the middle with the adjustment, thats just perfect, and no noices what so ever from the drive, conclusion: Its easy to convert to 60 from 50 Hz, Big Smile

Congratulations.  Yet another "Steely-eyed Missile Man."


tournedos
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tournedos replied on Sun, Jun 24 2012 4:47 PM

Well done! Yes - thumbs up

--mika

valve1
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valve1 replied on Mon, Jun 25 2012 7:38 AM

Søren Mexico:
Its easy to convert to 60 from 50 Hz, Big Smile

This is why every house needs a capstan lathe :-) !

Nice job Soren

Søren Mexico
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Monday I had guest for dinner, and proudly I introduced them to my BG 1202, connected to my BM 4000 and the Beovox 1600, played on LP side, turned it, and after a couple of songs I started to get some distortion.

Yesterday I opened the deck and cleaned all contacts,  the 5 pin plug and jack and the cantilever pegs, Deoxit, but couldnt get to the silent contact, as I see it, I will have to take of the top aluminum plate, and to get that one of I will have to take of the pickup arm.

After cleaning I tested again, and now no sound in the right speaker, but a loud boom in both speakers, when the silent contact turns on and of.

I hope its only the silent contact, but it may be the pickup giving up, its as old as the deck, will get at the contact today, I will come back with more.

Collecting Vintage B&O is not a hobby, its a lifestyle.

Dillen
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Dillen replied on Thu, Jul 5 2012 4:47 PM

Søren,

I don't think, you will need to remove the tonearm to access the muting switch but I don't remember this deck in details.
Another thing is, if your deck has the slot at the bottom for the plug-in RIAA, the bypassing contacts
at the bottom of the slot will almost certainly have oxidized and need cleaning.

Martin

Søren Mexico
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Dillen:

Søren,

I don't think, you will need to remove the tonearm to access the muting switch but I don't remember this deck in details.
Another thing is, if your deck has the slot at the bottom for the plug-in RIAA, the bypassing contacts
at the bottom of the slot will almost certainly have oxidized and need cleaning.

Martin

Here a pic, as you see, no plug for the RIAA, and the muting switch is placed between the main chassis and the plate for arm mechanism, so the only way to get at it, is to take out the swinging chassis or the top plate, in both cases I will have to take of the arm. The muting switch is operated by the arm with the blue arrow, through a plastic lever entering through a hole in the plate.

 

Collecting Vintage B&O is not a hobby, its a lifestyle.

Dillen
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Dillen replied on Thu, Jul 5 2012 9:35 PM

Oh yes.
Can't you take off the arm with the blue arrow ?

Martin

Søren Mexico
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Needed to clean the muting contacts, here goes.

Before starting, take of the pickup and platter, secure the pickup arm with a piece of tape to the top board. Secure transport screw, turn to stop and then one turn CCW

Place 4 pieces of wood, cups or whatever, some 7-10 Cm. high, as support for the deck upside down. Place deck on supports, take of bottom cover.

Take of E-clips, red arrows. Unhook relay box and wires. Take of lamp housing, take lamp out of housing and sneak it out under swinging chassis.Green arrows. Place it all to the right side, outside the swinging chassis.

Unhook steel wires, Blue arrows

Unscrew adjusting screws, Yellow arrows

Desolder all wires, White arrow

Take of the arm for pickup arm lift and the big white gear wheel, push out pin for the flywheel gear, press down on the flywheel and it comes out.

Lamp asamply

Gears

Wires desoldered

Turn the deck around to upside up, take of the counter weight, unscrew it until end of screw, then pull untill it comes of, mine was sitting very hard, because of damaged arm and weight, had to file and sand until it came on very smooth.

Unscrew Allen screw 2 turns, pull off arm, Be careful with the wires, they have to come out easy and without strain, help with pushing from below.

You can now turn the deck again, or take out the arm shaft, to clean and lubricate, mine was totally dry.

To take out the shaft, mark the position of the arm, there is a steel ring with a hole for the Allen screw, mark the hole with a permanent marker, and then when the shaft is out, make a mechanical point in the middle of the mark.

Arm off, steel ring off

Now press, from below, the shaft upwards and pry off the E-clip, warning they tend to fly away never to be found again.

Keeping a finger on below the shaft , press it down some 5 Mm. and then up again, take off the nylon ring and the funny steel ring, in there you will find 3 very small steel balls, take them out with a magnet or a magnetized screwdriver, dont loose them, nearly impossible to get new ones.

Pull shaft down and out

Check that the transport screw are one turn loose, turn the deck upside down, turn out the transport screws, the plates for chassis springs goes through the holes, no need to take the springs off. Place the swinging chassis upside down, and you will see the muting contacts

Here the contact, I measured megaohms, Kohms and Ohms, opening and closing several times, thats where the noise, on start and stop to the speakers, came from.

 

I use Deoxit from a bottle, dip a paper strip into it and place between the contacts, leave for 5 min. and clean the same way, pulling a paper strip with ISP between the contacts, I repeat this until the paper comes out clean, then I cleaned off the oxidation on the upper side. Checked again with the Ohm meter, no problems, 0 to 0.3 Ohm several times on both contacts. To get it all back together again, start here.

Here a pic after soldering the wires and a new 5 pin plug.

I put everything back in place, connected to my BM 4000 and the noise at start and stop is gone, but to cry for, my SP14 is gone, no sound in the right channel, tested with my BM 5000, same failure. so Axel will get more work.

My deck just went from USD 40.00 to some USD 160.00

Collecting Vintage B&O is not a hobby, its a lifestyle.

Ricardo
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Ricardo replied on Mon, Mar 11 2019 12:36 AM

My 1203 just arrived yesterday and it too is only 50 hz at 220 so i will need to do a similar fix

Søren Mexico
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Find a good machinist to make the belt wheel, if you do it my way, if you dont find a machinist come back to me, I still have your stands here, havent been to the states since making them. Welcome back good to see you again

Collecting Vintage B&O is not a hobby, its a lifestyle.

Rich
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Rich replied on Wed, Mar 27 2019 2:15 AM
It’s like a bona fide reunion! Even Evan posted this week!


Evan
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Evan replied on Wed, Mar 27 2019 12:13 PM

Rich:
It’s like a bona fide reunion! Even Evan posted this week!

Yes - thumbs up

I'm usually always lurking! Even if I haven't made any progress on my own stuff, I "check in" on some threads here and there!

Beo4 'til I die!

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