Good evening community !

could one of the BG 4000 Aficionados please describe where the infamous Reed-Relay is to be found.  ( Board No. & location No.)    

The one responsible for speed problems, and mentioned on P.1 of the Troubleshooting schematic in the SM.  I've found 2 references to Reed's on PCB 2 ??   but I'm not sure if these are to-do-with 33/45 switching.

I still have no automation whatsoever on this deck.

 

Frustrated !!

 

Thanks in advance

 

Zorb.

Might I suggest, without being disrespectful, that if you can't find the speed change relay then this is not a project for you. This machine really is quite complicated, using DTL i.c.'s which are very hard to come by and a fair amount of experience is required when fault finding.

For your information the reed relays are on the power board but the speed change relay (not a reed!) is on the main control board. If there is no speed selection you may have a problem on the logic board, which is under the keypad.

Many thanks  for reading my post Olly !

I'm grateful of your warning also !

I got into B&O earlier this year, hobbywise.  With Martin's (Dillen) advice & parts, I managed to get my BC 9500 & BC 9000 back into service. Usual Cassette & CD problems, capacitors, belts etc.

I bought the BG4000 fully expecting a challenge but not realising quite how compact  and finely balanced everything is. I felt that there were enough troubleshooting posts and pics to help me along.

I could probably put the deck into a service-center and have it fixed-up, but that was'nt the reason i bought it !    I enjoy tinkering with these things and connecting (via Forum) with other like-minded-souls.

Anyways, many thanks for your pointers !

BTW,  in the troubleshooting "map"  there is a box -question:

"does reed-relay function,  Dial illuminated ?"       after turntable power has been established and in direct connection with loss of 33rpm speed-change.

I don't know now how reliable the troublshooter is, after your comment ?

Many thanks & good luck with your projects.

 

Zorb

Munich

Hi Zorb

I saw your post only now! If you haven't junked or sold it, here are a few points.

Firstly, while it's nice that there are lots of pretty bright lights on the keyboard, they are not critical to circuit functioning, so don't worry if they do not illuminate - yet!

You have no option but to get in and clean the keyboard contacts. Those are critical to proper function.

There are 8. Desolder and remove only the "bridges" for cleaning the little "nipple" underneath.

Do NOT remove or bend the flat strip "plungers" - I can tell you from experience, that if you remove them, you may very likely never get them aligned again, rendering the keyboard useless.

Using proper contact cleaner, remove all the old oxidized crap from the plungers, and from the underside of the bridges.

On the \/ , < and >  contacts, there is an extra little pin under the plunger, which must be clean, as it is permanently closed. Wet a small rectangular cloth, and gently slide it side to side between the pin and plunger, to clean that contact area. 

After that is all done, check with an ohmmeter for proper function of all the contacts.

Until everything is functioning perfectly here, there's no point in continuing.

Menahem

 

Login to view imageHello Menahim,

I am a new guest on beoworld and reacting on your  post above, maybe you ca help me out to solve some problems I have with my Beogram 4000. 

Normal 0 0 1 176 1008 8 2 1237 11.1539 0 0 0

I own it almost 2 years and it was in good working condition a year ago . I did not use it for a  while, a week ago I decided to use it as my main turntable. I start it up push the start button nothing happened.  after a few seconds it went off. Tryed again, the same . Opened the deck checked for damage loosen wires etc. putting a new small belt on the slide driveshaft an push the start button again, nothing, same as before, then pushing the start and the left arrow the slide and the arms running back and forwards when I keep pushing the left arrow button the soon as I free the button it runs automatically back and the power gets off.   When it’s on and running like described above and push the off button nothing, the up and lowering button for the arm is also not responding. the arm goes up and down when I push the piston handle by hand. The spindle also makes a sound as a car wheel without a bearing. This I suppose is a easy to solve mechanical problem – the start problem could be a electric or keyboard contacts. hope you can  give me  advice  etc. to get this beautifull turntable running smooth again.

sa your explanantion / you mentioned 8 contacts / saying desolder / cleaning etc. But! how to desolder , looking at it and saw 8 plastic boxes wth  plungers / how to check them for proper function.

It's a delicate job / maybe its a better idea to clean  the cobtacts carefully with a fiber glassrod what do you suggest ?

greetings, 

Barn  

 

Barn

Do NOT remove or unsolder anything on that PCB.  ABSOLUTELY NOT!

Look at my picture of the PCB immediately before your message.

You need a can of Contact Cleaner Spray, and some small rectangular strips of card (like a plain white Business Card), which you soak with the contact cleaner, and then you slide them in and out at the flat plunger strips, in order to clean the contacts.

To repair the solenoid piston to working condition, you must disassemble the complete mechanism, remove all the old grease completely, put on new Motor Oil (never WD40), and then reassemble.

Remove the spindle - clean out the old grease, and squirt in new Motor Oil.

Menahem

         Menahem,     THX for the fast reply and info, I start to clean,  it  was realy neccesary, the contacts looked fet and black , manage to clean all went wel but I think I found the troublemaker. it was the last I had to clean . putiing away a bundel of cables and underneath I saw this ( picture) missing a bridge ! suppose there should be one / so no what ? I realy don't know how this bridges are fixed to the board. soldered? and how to get one . will try at the local electric suply store, they are specialized in all kind of electric spare parts relais etc. even ftom the 50ties / hopefully they can help/ or do you have any sugestion / I spent an hour to surch into the deck and around the workspace because it coild be possible that he small piece was fallen out during dismanteling . no luck

Barn 

Login to view image

Menahem. sorry to bother you with such silly questions , I had to look better, start to investigate the board beneath te strip and saw there was a  contactpoint underneath . worry for nothing / I cleaned the plunger already and it works fine /  anyway; how about the solenoid / I thought there is no reason to oil t the piston /  or am I wrong?/ because its a electric  magnetcoil / dissambling the mechanism cleaned and fresh oil / so far so good.

 

Barn

You've done a beautiful job in cleaning the contacts!

To prevent future oxidation, spray on Contact Cleaner now, but do NOT wipe it off.

I understand that everything is working fine now, is that correct?

If you need new belts, contact Dillen (Martin Olsen).