The Workbench

Re: First check Beosystem 6500

Step1 — Sun, 16 Jan 2011 04:18:32 GMT

Well done you hava a lovely system there. I am quite envious!!!

Re: First check Beosystem 6500

Søren Mexico — Sat, 15 Jan 2011 12:27:20 GMT

tournedos:

Søren Mexico:

Yes the MCP on top is just for photo. and the cover has sagged, but I will glue a 5 x 5 Mm. alumium angle to the under side, it will not be visible when the lid is closed, and when open it will look like its original.

Keep us posted on how that turns out - I've been thinking about doing something similar with a metal strip. Another improvement would be to somehow seal off the annoying dust gap left by the lid...

Will give it a thinker, and post, yes the gap is a bit annoying

Re: First check Beosystem 6500

tournedos — Sat, 15 Jan 2011 10:16:50 GMT

Søren Mexico:

Yes the MCP on top is just for photo. and the cover has sagged, but I will glue a 5 x 5 Mm. alumium angle to the under side, it will not be visible when the lid is closed, and when open it will look like its original.

Keep us posted on how that turns out - I've been thinking about doing something similar with a metal strip. Another improvement would be to somehow seal off the annoying dust gap left by the lid...

Re: First check Beosystem 6500

Søren Mexico — Sat, 15 Jan 2011 09:44:09 GMT

Yes the MCP on top is just for photo. and the cover has sagged, but I will glue a 5 x 5 Mm. alumium angle to the under side, it will not be visible when the lid is closed, and when open it will look like its original.

Where i have problems is with the side panel, the lower half has some white plastic strip attached with double sided tape, the tape is, from the factory, smaller than the strips, and they sort of quell out at the top and buttom, until now I didn't find material like it, but is still looking.

I will try to get the Beocord going, but just now I'm happy that the rest is working, I left it on for 6 hours yesterday and it works just as it should.

Re: First check Beosystem 6500

tournedos — Fri, 14 Jan 2011 19:15:28 GMT

Good work! Looks lovely, just like mine

It's fortunate that the last non-functional item is the least valuable. If it proves too hard to fix, it won't be an impossible task to find another white Beocord 6500. Or just swap the case parts with another colour unit.

I suppose you've just put the MCP there for the photo, but don't store it, or anything else, on top of the Beogram. The lids have an annoying habit of starting to sag at the rear end if any weight at all is kept on them.

Re: First check Beosystem 6500

Søren Mexico — Fri, 14 Jan 2011 18:48:43 GMT

Just a follow up of this restuaration and repair.

BM 6500:

Throughout cleaning, changed caps. Result, better reception, better sound, faster reacting when using MCP.

BG CD 6500:

Cleaning, lubrication, changed bands, ajusted and cleaned contact for tray open, opened front panel and cleaned front display. Result, opens and closes correctly, reacts on all commands from MCP, plays very good.

BG 6500:

Troughout cleaning, lubricated, repaired battered cover mecanism and upper back cover, changed caps, also in the preamp, changed bad 10 Ohm trimmer, repaired broken track on PCB, repaired bend swingring (under platter), changed bands, addjusted set down points, addjusted speed 33 and 45.

Main problem was the servo motor I thought, but came down to the broken track on the PCB and the 10 Ohm trimmer, the bend swingring was difficault, but I got it nearly perfect. Result, plays perfectly with used MMC4, now waiting for SMMC4 from Soundsmith

MCP 6500:

Throughout cleaning, roller bearing and contact for addjust ring was out for cleaning and the rollerbearing was lubricated with SKF roller bearing grease, the display and all lamp sections was out for cleaning. Result work faster and from longer distance, before cleaning it worked from about 2-3 Meters and a lot of no contact, now it works from 6 Meters without any problems, maybe farther but did not test.

Beocord 6500:

Cleaning, lubricated, changed bands. No result.

With tape inserted, pressing play, the tape jumps a little, pressing forward or reverse, the tape moves some 3 revolutions and stops, the toneheads does not come forward. I've cleaned and lubricated everything, but no result. Using the MCP the result is the same. Capstans are working. Will try again when I have some time to recover from my first Enteuschung (English ??). Comments please.

Red Line 140s:

Cleaning, changed caps in the crossovers, changed 4 woofers (Martins with new surrunds), Result, very good sound, its the first time I hear 140s and its just impressing what they put out, I think maybe better than my BL 8000, for sure different sound. Love it.

Here some pics from the finished product. The cable on the floor is my 220 V feedline, we have 120 V in Mexico, so I had to connect to 2 phases to get my 220. The 6500 was bought in DK 1989. This setup is just for testing.

Saludos from Mexico, Soren

Re: First check Beosystem 6500

Dillen — Wed, 27 Oct 2010 01:22:40 GMT

For the occasional ESD repair, I would receommend getting something like this antistatic field kit :

http://uk.farnell.com/vermason/j726r/esd-field-service-kit/dp/3550072

Martin

Re: First check Beosystem 6500

Søren Mexico — Tue, 26 Oct 2010 20:32:13 GMT

Got a good answer from Martin (as allways), but I'm kind of lost here:

BG 6500

Pressing play I check the current for the lamp inside the tangential drive, "0", I check on PCB with the muting switch "0". Wtih disk and no disk. Could it be the S3 contact ??

I check the platter motor: On PCB 1 at Jack P5, pressing start I get: P5-1: 11.9 V, P5-3: 8.5 V, P5-4: 9.1 V, P5-5, 0.0 V.

Attached to the platter motor there is a small print with maybe 10 small components on it, I'm kind of lost, how an it be that the motor with print, gets all these currents at the same time.

I've PMed with Martin will get 4 "new" woofers and caps for the crossovers for the RLs 140, and for the rest of the units what Martin recommends me, but I will have to invest in some antistatic equipment, will investigate what and to which prices, maybe I will use it only one time

I will leave the job now, mix me a strong Cuba and give it a thinker.

Re: First check Beosystem 6500

Søren Mexico — Tue, 26 Oct 2010 12:59:56 GMT

Hi Martin

Tried with 45 and 33, and without, same result, the mecanical side is ok, pressing start I move the platter by hand, and the tang. goes to 33 or 45 whatever is on the platter, also with the correct distances to center. but its like the platter motor do not get enough power it only jucks a little and then nothing.

About the parts, you will have a PM in 30 min. and its urgent my pal leaves for Denmark on thursday.

Re: First check Beosystem 6500

Dillen — Tue, 26 Oct 2010 09:52:02 GMT

Good job on the subplatter !

Sorry, but I simply have to ask if you tried the Beogram with a record on the platter ?
With no record, it will do exactly as you describe...

Martin

Re: First check Beosystem 6500

Søren Mexico — Mon, 25 Oct 2010 23:34:32 GMT

Got to the flywheel from the BG today, took of the center plastic piece and set up the wheel in my lathe, first checking the center shaft for damage, Measuring 0.005 mm. circumference difference, but that may be my lathe chuck, the outer ring on the wheel is another story, 9.0 mm up-down difference, band surface 0.5 mm circumference difference.

With the top side of the wheel resting against, and the center shaft in, the chuck, using a pointed cutting steel as guide I set my dial on the sledge to "0" on the highest point of the wheel, turned the wheel 180 degrees and marked the lowest point, back to the high point, with the sledge I carefully put pressure on the wheel, went back to "0" on the dial and checked the movement, I had to put on pressure some 5-6 times before the wheel started to respond to the pressure, when, with my dial on "o" ,I had a distance from the high point to the cutting steel,of some 2 mm,. I turned 180 degrees and checked the lowest point, and so on untill I was within 1 mm of difference, now I put on pressure on the highest point and checked after each time the whole circumference after 1.5 houer I had an up-down difference of only 0.2 mm. Acceptable, the circumference difference on the band surface is below 0.1 mm.

Inserted the wheel in the BG and there was now a sliding sound nearly all way around, sliding on the support taps on the swing chassis.

Center to high (or outer ring to low), back to the lathe, center shaft in a drill chuck, upside wheel center to drill chuck, and with outer ring against the lathe chuck, bend the center to a lower position, again 5-6 tries with pressure before I got a result, back to the BG, now the wheel is running free and very light.

Put on the aluminum platter, it was some 3-3.5 mm over the top plate, ajusted with the suspention springs to the correct distance.

But the BG does not work, pressing play the platter motor jumps a little, light comes on with "33" at the end of the sensor arm, and after some seconds it turns of again, pressing lift or turn, the worklight comes on, pressing stop all stops. The radial drive motor is working after pressing start, moving the platter by hand and the radial in pos. to disk from there I can move the radial with lift and turn.

Will need help on this one

Re: First check Beosystem 6500

Søren Mexico — Sun, 24 Oct 2010 22:34:41 GMT

Got the midrange out, bend a 1.5 x 25 x 200 mm steel bar 90 degrees 15 mm from one end, and could, working around the driver, get it out without problems, cleaned the woofers, used 3M green pads (kittchen ware) with acetone, to get of the last glue and foam from the driver ring, works good, took of one dust cap to see the tight fit that, according to Martin has to be shimmed to get it right, he's right its tight, some 0.5 mm by look and feel. left the other dust cap on and tapped the off one with some paper, getting dirt in there will be a disaster.

Send a PM to Martin to see what will be needed for renovation af the system, will be waiting nervously for his respond (I think I got HIS right this time)

Re: First check Beosystem 6500

Søren Mexico — Fri, 22 Oct 2010 11:15:23 GMT

Opened one of the RL 140, everything I learned on this forum came through. After screwing a lot, I got the speaker open, and found woofer surrounds in bad condition, the crossover looks OK but with electrolytic caps. I tried to take out the mid range, but it is like glued to the chassis, will try again today, it looks OK, but who knows.

Pics and comments

The inside, I don't think this speaker was opened since it left the factory in Struer in wonderful DK

The right side woofer, took it out, it looked very good, touched the surround very lightly with my finger and the foam just gave way.

Left side woofer came out like this with the damaged surround.

The tweeter, from Norway, an earlier Danish colony

The mid range speaker, Nokia, from the land of 1000 lakes, sorry Mika its not, the small print reads "made in Germany"

The crossover, looks like new, all the driver cables is connected with clips and comes of easy, the connection to the 2 pin Din is soldered, or maybe it comes out if I take of the middle piece screwed to the front panel, will give it a try today.

Re: First check Beosystem 6500

Søren Mexico — Thu, 21 Oct 2010 10:26:46 GMT

Thankyou Mika, will do, then onto the RL 140, open them and check the drivers, after that I will contact Martin for parts and sugestions of what to do with all the units, I would like your comments on this also, waiting for the parts to come I will start with the BG flywheel, but after some days thinking about the BG I think there may be more damages, the force that broke the lid support must have been very big, the tangential mecanismus is directly under the cover support. Looking inside the TT I see the tang. drive motor with band to the tang. drive, there is no visible damage, but the drive wheel on the motor and the wheel on the tang. drive is not exactly in line, when I press down the suspention to nearly stop, they line up, but with the flywheel and the platter in position, the floating chassis does not go that far down, the disalignment is barely visible, and it may be bad construction, the owner told me that it got damaged in the container from DK to Mexico, but the damage looks more like caused by an upforce than something falling on it, on the cover there is no marks more than normal on the upper surfaces.

Well, I have time to invistigate more and find out how to repair it.

2 days ago I was playing music on my BG 2404 with the MMC 2, after 1.5 LP the suspention in the MMC 2 gave way, you could hear it, over 3 tracks on the LP the sound slowly got worse until the cantilever started skating. Checking I could see the cartridge housing touching the LP.

As my MMC 4 also gave up 2 month ago I must conclude that all MMCs still existing today are in bad condition, and buying one on Ebay for gold is a waste of money, and I, stupid A*****, bought a BG 5000 with MMC 4, just for the cartridge. The BG 5000 is still up in McAllen TX waiting for me to pick it up.

My clients are calling, so today I must do the only thing that I don't like about life, work to live.

Re: First check Beosystem 6500

tournedos — Thu, 21 Oct 2010 02:02:29 GMT

My suggestion is to not waste your time on the Beocord until you have installed new belts. All three for the mechanism + possibly the drawer. If they haven't been replaced earlier, they simply will not work.

These really have the funny habit of leaving the motor + capstan pins running until standby once you start them.